Assertion failure while streaming toasted data
Started by Pavan Deolaseeover 4 years ago25 messages
Hi,
While working on an output plugin that uses streaming protocol, I hit an
assertion failure. Further investigations revealed a possible bug in core
Postgres. This must be new to PG14 since streaming support is new to this
release. I extended the test_decoding regression test to demonstrate the
failure. PFA
```
2021-05-25 11:32:19.493 IST client backend[68321] pg_regress/stream
STATEMENT: SELECT data FROM pg_logical_slot_get_changes('regression_slot',
NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '
1', 'stream-changes', '1');
TRAP: FailedAssertion("txn->size == 0", File: "reorderbuffer.c", Line:
3476, PID: 68321)
```
From my preliminary analysis, it looks like we fail to adjust the memory
accounting after streaming toasted tuples. More concretely, after
`ReorderBufferProcessPartialChange()` processes the in-progress
transaction, `ReorderBufferTruncateTXN()` truncates the accumulated
changed in the transaction, but fails to adjust the buffer size for toast
chunks. Maybe we are missing a call to `ReorderBufferToastReset()`
somewhere?
From what I see, the assertion only triggers when data is inserted via COPY
(multi-insert).
Let me know if anything else is needed to reproduce this.
Thanks,
Pavan
--
Pavan Deolasee
EnterpriseDB: https://www.enterprisedb.com
Attachments:
stream_toasted_txn_test.patchapplication/octet-stream; name=stream_toasted_txn_test.patchDownload
diff --git a/contrib/test_decoding/sql/stream.sql b/contrib/test_decoding/sql/stream.sql
index ce86c816d11..fd1626101eb 100644
--- a/contrib/test_decoding/sql/stream.sql
+++ b/contrib/test_decoding/sql/stream.sql
@@ -27,4 +27,37 @@ INSERT INTO stream_test SELECT repeat('a', 6000) || g.i FROM generate_series(1,
SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL,NULL, 'include-xids', '0', 'skip-empty-xacts', '1', 'stream-changes', '1');
DROP TABLE stream_test;
+
+-- create a toasted table and populate it with a few rows.
+CREATE TABLE public.toasted (
+ id serial ,
+ other text,
+ data text NOT NULL
+);
+ALTER TABLE public.toasted ALTER COLUMN data SET STORAGE EXTERNAL;
+
+\copy toasted from stdin with csv
+9001,bbb,ccc
+9002,ddd,eee
+9003,bar,aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+9004,aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa,bar
+\.
+
+-- exponentially increase the amount of copied data. Our goal is cross
+-- the logical_decoding_work_mem setting
+SELECT 'psql -At -c "copy toasted to stdout" ' || current_database() AS copy_command \gset
+copy toasted from program :'copy_command';
+copy toasted from program :'copy_command';
+copy toasted from program :'copy_command';
+copy toasted from program :'copy_command';
+copy toasted from program :'copy_command';
+
+-- consume changes with transaction streaming
+SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1', 'stream-changes', '1');
+
+-- exceed 64kB logical_decoding_work_mem threshold
+copy toasted from program :'copy_command';
+-- consume changes with transaction streaming
+SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1', 'stream-changes', '1');
+
SELECT pg_drop_replication_slot('regression_slot');
Re: Assertion failure while streaming toasted data
On Tue, May 25, 2021 at 12:06 PM Pavan Deolasee
<pavan.deolasee@gmail.com> wrote:
Hi,
While working on an output plugin that uses streaming protocol, I hit an assertion failure. Further investigations revealed a possible bug in core Postgres. This must be new to PG14 since streaming support is new to this release. I extended the test_decoding regression test to demonstrate the failure. PFA
```
2021-05-25 11:32:19.493 IST client backend[68321] pg_regress/stream STATEMENT: SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '
1', 'stream-changes', '1');
TRAP: FailedAssertion("txn->size == 0", File: "reorderbuffer.c", Line: 3476, PID: 68321)
```From my preliminary analysis, it looks like we fail to adjust the memory accounting after streaming toasted tuples. More concretely, after `ReorderBufferProcessPartialChange()` processes the in-progress transaction, `ReorderBufferTruncateTXN()` truncates the accumulated changed in the transaction, but fails to adjust the buffer size for toast chunks. Maybe we are missing a call to `ReorderBufferToastReset()` somewhere?
From what I see, the assertion only triggers when data is inserted via COPY (multi-insert).
Let me know if anything else is needed to reproduce this.
Thanks, I will look into this and let you know if need some help.
--
Regards,
Dilip Kumar
EnterpriseDB: http://www.enterprisedb.com
Re: Assertion failure while streaming toasted data
On Tue, May 25, 2021 at 12:06:38PM +0530, Pavan Deolasee wrote:
While working on an output plugin that uses streaming protocol, I hit an
assertion failure. Further investigations revealed a possible bug in core
Postgres. This must be new to PG14 since streaming support is new to this
release. I extended the test_decoding regression test to demonstrate the
failure. PFA
Thanks, Pavan. I have added an open item for this one.
--
Michael
Re: Assertion failure while streaming toasted data
On Tue, May 25, 2021 at 12:12 PM Dilip Kumar <dilipbalaut@gmail.com> wrote:
On Tue, May 25, 2021 at 12:06 PM Pavan Deolasee
<pavan.deolasee@gmail.com> wrote:Hi,
While working on an output plugin that uses streaming protocol, I hit an assertion failure. Further investigations revealed a possible bug in core Postgres. This must be new to PG14 since streaming support is new to this release. I extended the test_decoding regression test to demonstrate the failure. PFA
```
2021-05-25 11:32:19.493 IST client backend[68321] pg_regress/stream STATEMENT: SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '
1', 'stream-changes', '1');
TRAP: FailedAssertion("txn->size == 0", File: "reorderbuffer.c", Line: 3476, PID: 68321)
```From my preliminary analysis, it looks like we fail to adjust the memory accounting after streaming toasted tuples. More concretely, after `ReorderBufferProcessPartialChange()` processes the in-progress transaction, `ReorderBufferTruncateTXN()` truncates the accumulated changed in the transaction, but fails to adjust the buffer size for toast chunks. Maybe we are missing a call to `ReorderBufferToastReset()` somewhere?
From what I see, the assertion only triggers when data is inserted via COPY (multi-insert).
Let me know if anything else is needed to reproduce this.
Thanks, I will look into this and let you know if need some help.
I have identified the cause of the issue, basically, the reason is if
we are doing a multi insert operation we don't set the toast cleanup
until we get the last tuple of the xl_multi_insert [1]/* * Reset toast reassembly state only after the last row in the last * xl_multi_insert_tuple record emitted by one heap_multi_insert() * call. */ if (xlrec->flags & XLH_INSERT_LAST_IN_MULTI && (i + 1) == xlrec->ntuples) change->data.tp.clear_toast_afterwards = true; else change->data.tp.clear_toast_afterwards = false;. Now, with
streaming, we can process the transaction in between the multi-insert
but while doing that the "change->data.tp.clear_toast_afterwards" is
set to false in all the tuples in this stream. And due to this we will
not clean up the toast.
One simple fix could be that we can just clean the toast memory if we
are processing in the streaming mode (as shown in the attached patch).
But maybe that is not the best-optimized solution, ideally, we can
save the toast until we process the last tuple of multi-insert in the
current stream, but I think that's not an easy thing to identify.
[1]: /* * Reset toast reassembly state only after the last row in the last * xl_multi_insert_tuple record emitted by one heap_multi_insert() * call. */ if (xlrec->flags & XLH_INSERT_LAST_IN_MULTI && (i + 1) == xlrec->ntuples) change->data.tp.clear_toast_afterwards = true; else change->data.tp.clear_toast_afterwards = false;
/*
* Reset toast reassembly state only after the last row in the last
* xl_multi_insert_tuple record emitted by one heap_multi_insert()
* call.
*/
if (xlrec->flags & XLH_INSERT_LAST_IN_MULTI &&
(i + 1) == xlrec->ntuples)
change->data.tp.clear_toast_afterwards = true;
else
change->data.tp.clear_toast_afterwards = false;
--
Regards,
Dilip Kumar
EnterpriseDB: http://www.enterprisedb.com
Attachments:
streaming_toast_bug_fix.patchtext/x-patch; charset=US-ASCII; name=streaming_toast_bug_fix.patchDownload
diff --git a/src/backend/replication/logical/reorderbuffer.c b/src/backend/replication/logical/reorderbuffer.c
index b0ab91c..76ecfc0 100644
--- a/src/backend/replication/logical/reorderbuffer.c
+++ b/src/backend/replication/logical/reorderbuffer.c
@@ -2183,7 +2183,7 @@ ReorderBufferProcessTXN(ReorderBuffer *rb, ReorderBufferTXN *txn,
* they're not required anymore. The creator of the
* tuple tells us.
*/
- if (change->data.tp.clear_toast_afterwards)
+ if (change->data.tp.clear_toast_afterwards || streaming)
ReorderBufferToastReset(rb, txn);
}
/* we're not interested in toast deletions */
Re: Assertion failure while streaming toasted data
On Tue, May 25, 2021 at 1:26 PM Dilip Kumar <dilipbalaut@gmail.com> wrote:
I have identified the cause of the issue, basically, the reason is if
we are doing a multi insert operation we don't set the toast cleanup
until we get the last tuple of the xl_multi_insert [1]. Now, with
streaming, we can process the transaction in between the multi-insert
but while doing that the "change->data.tp.clear_toast_afterwards" is
set to false in all the tuples in this stream. And due to this we will
not clean up the toast.
Thanks. That matches my understanding too.
One simple fix could be that we can just clean the toast memory if we
are processing in the streaming mode (as shown in the attached patch).
I am not entirely sure if it works correctly. I'd tried something similar,
but the downstream node using
my output plugin gets NULL values for the toast columns. It's a bit hard
to demonstrate that with the
test_decoding plugin, but if you have some other mechanism to test that
change with an actual downstream
node receiving and applying changes, it will be useful to test with that.
Thanks,
Pavan
--
Pavan Deolasee http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
Re: Assertion failure while streaming toasted data
On Tue, May 25, 2021 at 1:45 PM Pavan Deolasee <pavan.deolasee@gmail.com> wrote:
I am not entirely sure if it works correctly. I'd tried something similar, but the downstream node using
my output plugin gets NULL values for the toast columns. It's a bit hard to demonstrate that with the
test_decoding plugin, but if you have some other mechanism to test that change with an actual downstream
node receiving and applying changes, it will be useful to test with that.
Okay, I will test that. Thanks.
--
Regards,
Dilip Kumar
EnterpriseDB: http://www.enterprisedb.com
Re: Assertion failure while streaming toasted data
On Tue, May 25, 2021 at 1:49 PM Dilip Kumar <dilipbalaut@gmail.com> wrote:
On Tue, May 25, 2021 at 1:45 PM Pavan Deolasee <pavan.deolasee@gmail.com>
wrote:I am not entirely sure if it works correctly. I'd tried something
similar, but the downstream node using
my output plugin gets NULL values for the toast columns. It's a bit
hard to demonstrate that with the
test_decoding plugin, but if you have some other mechanism to test that
change with an actual downstream
node receiving and applying changes, it will be useful to test with that.
Okay, I will test that. Thanks.
I modified test_decoding to print the tuples (like in the non-streamed
case) and included your proposed fix. PFA
When the transaction is streamed, I see:
```
+ opening a streamed block for transaction
+ table public.toasted: INSERT: id[integer]:9001 other[text]:'bbb'
data[text]:'ccc'
+ table public.toasted: INSERT: id[integer]:9002 other[text]:'ddd'
data[text]:'eee'
+ table public.toasted: INSERT: id[integer]:9003 other[text]:'bar'
data[text]:unchanged-toast-datum
<snipped>
```For a non-streamed case, the `data[text]` column shows the actual data.
That probably manifests into NULL data when downstream handles it.
Thanks,
Pavan
--
Pavan Deolasee
EnterpriseDB: https://www.enterprisedb.com
Attachments:
stream_toasted_txn_print_tuples.patchapplication/octet-stream; name=stream_toasted_txn_print_tuples.patchDownload
diff --git a/contrib/test_decoding/test_decoding.c b/contrib/test_decoding/test_decoding.c
index de1b6926581..cbf25cb2236 100644
--- a/contrib/test_decoding/test_decoding.c
+++ b/contrib/test_decoding/test_decoding.c
@@ -900,6 +900,9 @@ pg_decode_stream_change(LogicalDecodingContext *ctx,
{
TestDecodingData *data = ctx->output_plugin_private;
TestDecodingTxnData *txndata = txn->output_plugin_private;
+ Form_pg_class class_form;
+ TupleDesc tupdesc;
+ MemoryContext old;
/* output stream start if we haven't yet */
if (data->skip_empty_xacts && !txndata->stream_wrote_changes)
@@ -913,6 +916,71 @@ pg_decode_stream_change(LogicalDecodingContext *ctx,
appendStringInfo(ctx->out, "streaming change for TXN %u", txn->xid);
else
appendStringInfoString(ctx->out, "streaming change for transaction");
+
+ class_form = RelationGetForm(relation);
+ tupdesc = RelationGetDescr(relation);
+
+ /* Avoid leaking memory by using and resetting our own context */
+ old = MemoryContextSwitchTo(data->context);
+
+ OutputPluginPrepareWrite(ctx, true);
+
+ appendStringInfoString(ctx->out, "table ");
+ appendStringInfoString(ctx->out,
+ quote_qualified_identifier(get_namespace_name(get_rel_namespace(RelationGetRelid(relation))),
+ class_form->relrewrite ?
+ get_rel_name(class_form->relrewrite) :
+ NameStr(class_form->relname)));
+ appendStringInfoChar(ctx->out, ':');
+
+ switch (change->action)
+ {
+ case REORDER_BUFFER_CHANGE_INSERT:
+ appendStringInfoString(ctx->out, " INSERT:");
+ if (change->data.tp.newtuple == NULL)
+ appendStringInfoString(ctx->out, " (no-tuple-data)");
+ else
+ tuple_to_stringinfo(ctx->out, tupdesc,
+ &change->data.tp.newtuple->tuple,
+ false);
+ break;
+ case REORDER_BUFFER_CHANGE_UPDATE:
+ appendStringInfoString(ctx->out, " UPDATE:");
+ if (change->data.tp.oldtuple != NULL)
+ {
+ appendStringInfoString(ctx->out, " old-key:");
+ tuple_to_stringinfo(ctx->out, tupdesc,
+ &change->data.tp.oldtuple->tuple,
+ true);
+ appendStringInfoString(ctx->out, " new-tuple:");
+ }
+
+ if (change->data.tp.newtuple == NULL)
+ appendStringInfoString(ctx->out, " (no-tuple-data)");
+ else
+ tuple_to_stringinfo(ctx->out, tupdesc,
+ &change->data.tp.newtuple->tuple,
+ false);
+ break;
+ case REORDER_BUFFER_CHANGE_DELETE:
+ appendStringInfoString(ctx->out, " DELETE:");
+
+ /* if there was no PK, we only know that a delete happened */
+ if (change->data.tp.oldtuple == NULL)
+ appendStringInfoString(ctx->out, " (no-tuple-data)");
+ /* In DELETE, only the replica identity is present; display that */
+ else
+ tuple_to_stringinfo(ctx->out, tupdesc,
+ &change->data.tp.oldtuple->tuple,
+ true);
+ break;
+ default:
+ Assert(false);
+ }
+
+ MemoryContextSwitchTo(old);
+ MemoryContextReset(data->context);
+
OutputPluginWrite(ctx, true);
}
diff --git a/src/backend/replication/logical/reorderbuffer.c b/src/backend/replication/logical/reorderbuffer.c
index b0ab91cc71b..76ecfc0079c 100644
--- a/src/backend/replication/logical/reorderbuffer.c
+++ b/src/backend/replication/logical/reorderbuffer.c
@@ -2183,7 +2183,7 @@ ReorderBufferProcessTXN(ReorderBuffer *rb, ReorderBufferTXN *txn,
* they're not required anymore. The creator of the
* tuple tells us.
*/
- if (change->data.tp.clear_toast_afterwards)
+ if (change->data.tp.clear_toast_afterwards || streaming)
ReorderBufferToastReset(rb, txn);
}
/* we're not interested in toast deletions */
Re: Assertion failure while streaming toasted data
On Tue, May 25, 2021 at 1:59 PM Pavan Deolasee <pavan.deolasee@gmail.com> wrote:
On Tue, May 25, 2021 at 1:49 PM Dilip Kumar <dilipbalaut@gmail.com> wrote:
On Tue, May 25, 2021 at 1:45 PM Pavan Deolasee <pavan.deolasee@gmail.com> wrote:
I am not entirely sure if it works correctly. I'd tried something similar, but the downstream node using
my output plugin gets NULL values for the toast columns. It's a bit hard to demonstrate that with the
test_decoding plugin, but if you have some other mechanism to test that change with an actual downstream
node receiving and applying changes, it will be useful to test with that.Okay, I will test that. Thanks.
I modified test_decoding to print the tuples (like in the non-streamed case) and included your proposed fix. PFA
When the transaction is streamed, I see: ``` + opening a streamed block for transaction + table public.toasted: INSERT: id[integer]:9001 other[text]:'bbb' data[text]:'ccc' + table public.toasted: INSERT: id[integer]:9002 other[text]:'ddd' data[text]:'eee' + table public.toasted: INSERT: id[integer]:9003 other[text]:'bar' data[text]:unchanged-toast-datum <snipped> ```For a non-streamed case, the `data[text]` column shows the actual data. That probably manifests into NULL data when downstream handles it.
Yes, I am able to reproduce this, basically, until we get the last
tuple of the multi insert we can not clear the toast data otherwise we
can never form a complete tuple. So the only possible fix I can think
of is to consider the multi-insert WAL without the final multi-insert
tuple as partial data then we will avoid streaming until we get the
complete WAL of one multi-insert. I am working on the patch to fix
this, I will share that in some time.
--
Regards,
Dilip Kumar
EnterpriseDB: http://www.enterprisedb.com
Re: Assertion failure while streaming toasted data
On Tue, May 25, 2021 at 2:34 PM Dilip Kumar <dilipbalaut@gmail.com> wrote:
When the transaction is streamed, I see: ``` + opening a streamed block for transaction + table public.toasted: INSERT: id[integer]:9001 other[text]:'bbb' data[text]:'ccc' + table public.toasted: INSERT: id[integer]:9002 other[text]:'ddd' data[text]:'eee' + table public.toasted: INSERT: id[integer]:9003 other[text]:'bar' data[text]:unchanged-toast-datum <snipped> ```For a non-streamed case, the `data[text]` column shows the actual data. That probably manifests into NULL data when downstream handles it.
Yes, I am able to reproduce this, basically, until we get the last
tuple of the multi insert we can not clear the toast data otherwise we
can never form a complete tuple. So the only possible fix I can think
of is to consider the multi-insert WAL without the final multi-insert
tuple as partial data then we will avoid streaming until we get the
complete WAL of one multi-insert. I am working on the patch to fix
this, I will share that in some time.
The attached patch should fix the issue, now the output is like below
===
opening a streamed block for transaction
table public.toasted: INSERT: id[integer]:9001 other[text]:'bbb'
data[text]:'ccc'
table public.toasted: INSERT: id[integer]:9002 other[text]:'ddd'
data[text]:'eee'
table public.toasted: INSERT: id[integer]:9003 other[text]:'bar'
data[text]:'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
<repeat >
===
--
Regards,
Dilip Kumar
EnterpriseDB: http://www.enterprisedb.com
Attachments:
v1-0001-Fix-bug-while-streaming-the-multi-insert-toast-ch.patchtext/x-patch; charset=US-ASCII; name=v1-0001-Fix-bug-while-streaming-the-multi-insert-toast-ch.patchDownload
From fc58da41802f966dd269679921a5daa33d21a291 Mon Sep 17 00:00:00 2001
From: Dilip Kumar <dilipkumar@localhost.localdomain>
Date: Tue, 25 May 2021 14:51:45 +0530
Subject: [PATCH v1] Fix bug while streaming the multi-insert toast changes
While processing the multi-insert we can not clean the toast untill
we get the last insert of the multi-insert. So mark the transaction
incomplete for streaming if we get any multi-insert change, and keep
it set until we get the last tuple of the multi-insert.
---
src/backend/replication/logical/reorderbuffer.c | 11 +++++++++++
src/include/replication/reorderbuffer.h | 11 ++++++++++-
2 files changed, 21 insertions(+), 1 deletion(-)
diff --git a/src/backend/replication/logical/reorderbuffer.c b/src/backend/replication/logical/reorderbuffer.c
index b0ab91c..b715992 100644
--- a/src/backend/replication/logical/reorderbuffer.c
+++ b/src/backend/replication/logical/reorderbuffer.c
@@ -732,6 +732,17 @@ ReorderBufferProcessPartialChange(ReorderBuffer *rb, ReorderBufferTXN *txn,
}
/*
+ * Set the multi insert bit whenever we get the clear_toast_afterwards
+ * as false otherwise reset it if this is set.
+ */
+ if (!change->data.tp.clear_toast_afterwards)
+ {
+ toptxn->txn_flags |= RBTXN_HAS_MULTI_INSERT;
+ }
+ else if rbtxn_has_multi_insert(toptxn)
+ toptxn->txn_flags &= ~RBTXN_HAS_MULTI_INSERT;
+
+ /*
* Stream the transaction if it is serialized before and the changes are
* now complete in the top-level transaction.
*
diff --git a/src/include/replication/reorderbuffer.h b/src/include/replication/reorderbuffer.h
index 53cdfa5..cd36a8d 100644
--- a/src/include/replication/reorderbuffer.h
+++ b/src/include/replication/reorderbuffer.h
@@ -176,6 +176,7 @@ typedef struct ReorderBufferChange
#define RBTXN_HAS_SPEC_INSERT 0x0040
#define RBTXN_PREPARE 0x0080
#define RBTXN_SKIPPED_PREPARE 0x0100
+#define RBTXN_HAS_MULTI_INSERT 0x0200
/* Does the transaction have catalog changes? */
#define rbtxn_has_catalog_changes(txn) \
@@ -214,11 +215,19 @@ typedef struct ReorderBufferChange
( \
((txn)->txn_flags & RBTXN_HAS_SPEC_INSERT) != 0 \
)
+/*
+ * This transaction's changes has multi insert, without last
+ * multi insert tuple.
+ */
+#define rbtxn_has_multi_insert(txn) \
+( \
+ ((txn)->txn_flags & RBTXN_HAS_MULTI_INSERT) != 0 \
+)
/* Check whether this transaction has an incomplete change. */
#define rbtxn_has_incomplete_tuple(txn) \
( \
- rbtxn_has_toast_insert(txn) || rbtxn_has_spec_insert(txn) \
+ rbtxn_has_toast_insert(txn) || rbtxn_has_spec_insert(txn) || rbtxn_has_multi_insert(txn) \
)
/*
--
1.8.3.1
Re: Assertion failure while streaming toasted data
On Tue, May 25, 2021 at 2:57 PM Dilip Kumar <dilipbalaut@gmail.com> wrote:
Yes, I am able to reproduce this, basically, until we get the last
tuple of the multi insert we can not clear the toast data otherwise we
can never form a complete tuple. So the only possible fix I can think
of is to consider the multi-insert WAL without the final multi-insert
tuple as partial data then we will avoid streaming until we get the
complete WAL of one multi-insert. I am working on the patch to fix
this, I will share that in some time.The attached patch should fix the issue, now the output is like below
Thanks. This looks fine to me. We should still be able to stream
multi-insert transactions (COPY) as and when the copy buffer becomes full
and is flushed. That seems to be a reasonable restriction to me.
We should incorporate the regression test in the final patch. I am not
entirely sure if what I have done is acceptable (or even works in
all scenarios). We could possibly have a long list of tuples instead of
doing the exponential magic. Or we should consider lowering the min value
for logical_decoding_work_mem and run these tests with a much lower value.
In fact, that's how I caught the problem in the first place. I had
deliberately lowered the value to 1kB so that streaming code kicks in very
often and even for small transactions.
Thanks,
Pavan
--
Pavan Deolasee
EnterpriseDB: https://www.enterprisedb..com
Re: Assertion failure while streaming toasted data
On Tue, May 25, 2021 at 3:33 PM Pavan Deolasee <pavan.deolasee@gmail.com> wrote:
The attached patch should fix the issue, now the output is like below
Thanks. This looks fine to me. We should still be able to stream multi-insert transactions (COPY) as and when the copy buffer becomes full and is flushed. That seems to be a reasonable restriction to me.
We should incorporate the regression test in the final patch. I am not entirely sure if what I have done is acceptable (or even works in all scenarios). We could possibly have a long list of tuples instead of doing the exponential magic. Or we should consider lowering the min value for logical_decoding_work_mem and run these tests with a much lower value. In fact, that's how I caught the problem in the first place. I had deliberately lowered the value to 1kB so that streaming code kicks in very often and even for small transactions.
Thanks for confirming, I will come up with the test and add that to
the next version of the patch.
--
Regards,
Dilip Kumar
EnterpriseDB: http://www.enterprisedb.com
Re: Assertion failure while streaming toasted data
On Tue, May 25, 2021 at 2:57 PM Dilip Kumar <dilipbalaut@gmail.com> wrote:
On Tue, May 25, 2021 at 2:34 PM Dilip Kumar <dilipbalaut@gmail.com> wrote:
When the transaction is streamed, I see: ``` + opening a streamed block for transaction + table public.toasted: INSERT: id[integer]:9001 other[text]:'bbb' data[text]:'ccc' + table public.toasted: INSERT: id[integer]:9002 other[text]:'ddd' data[text]:'eee' + table public.toasted: INSERT: id[integer]:9003 other[text]:'bar' data[text]:unchanged-toast-datum <snipped> ```For a non-streamed case, the `data[text]` column shows the actual data. That probably manifests into NULL data when downstream handles it.
Yes, I am able to reproduce this, basically, until we get the last
tuple of the multi insert we can not clear the toast data otherwise we
can never form a complete tuple. So the only possible fix I can think
of is to consider the multi-insert WAL without the final multi-insert
tuple as partial data then we will avoid streaming until we get the
complete WAL of one multi-insert.
Yeah, that sounds reasonable.
I am working on the patch to fix
this, I will share that in some time.The attached patch should fix the issue, now the output is like below
Your patch will fix the reported scenario but I don't like the way
multi_insert flag is used to detect incomplete tuple. One problem
could be that even when there are no toast inserts, it won't allow to
stream unless we get the last tuple of multi insert WAL. How about
changing the code such that when we are clearing the toast flag, we
additionally check 'clear_toast_afterwards' flag?
--
With Regards,
Amit Kapila.
Re: Assertion failure while streaming toasted data
On Tue, May 25, 2021 at 4:50 PM Amit Kapila <amit.kapila16@gmail.com> wrote:
Your patch will fix the reported scenario but I don't like the way
multi_insert flag is used to detect incomplete tuple. One problem
could be that even when there are no toast inserts, it won't allow to
stream unless we get the last tuple of multi insert WAL. How about
changing the code such that when we are clearing the toast flag, we
additionally check 'clear_toast_afterwards' flag?
Yes, that can be done, I will fix this in the next version of the patch.
--
Regards,
Dilip Kumar
EnterpriseDB: http://www.enterprisedb.com
Re: Assertion failure while streaming toasted data
On Tue, May 25, 2021 at 5:46 PM Dilip Kumar <dilipbalaut@gmail.com> wrote:
On Tue, May 25, 2021 at 4:50 PM Amit Kapila <amit.kapila16@gmail.com> wrote:
Your patch will fix the reported scenario but I don't like the way
multi_insert flag is used to detect incomplete tuple. One problem
could be that even when there are no toast inserts, it won't allow to
stream unless we get the last tuple of multi insert WAL. How about
changing the code such that when we are clearing the toast flag, we
additionally check 'clear_toast_afterwards' flag?Yes, that can be done, I will fix this in the next version of the patch.
I have fixed as per the suggestion, and as per the offlist discussion,
I have merged the TOAST and SPEC insert flag and created a single
PARTIAL_CHANGE flag.
I have also added a test case for this.
--
Regards,
Dilip Kumar
EnterpriseDB: http://www.enterprisedb.com
Attachments:
v2-0001-Fix-bug-while-streaming-the-multi-insert-toast-ch.patchtext/x-patch; charset=US-ASCII; name=v2-0001-Fix-bug-while-streaming-the-multi-insert-toast-ch.patchDownload
From 37bd2166bc5036613ec2666ac06ae8106170550b Mon Sep 17 00:00:00 2001
From: Dilip Kumar <dilipkumar@localhost.localdomain>
Date: Tue, 25 May 2021 14:51:45 +0530
Subject: [PATCH v2] Fix bug while streaming the multi-insert toast changes
While processing the multi-insert we can not clean the toast untill
we get the last insert of the multi-insert. So mark the transaction
incomplete for streaming if we get any multi-insert change, and keep
it set until we get the last tuple of the multi-insert.
---
contrib/test_decoding/expected/stream.out | 41 +++++++++++++++++++++++++
contrib/test_decoding/sql/stream.sql | 5 +++
src/backend/replication/logical/reorderbuffer.c | 36 ++++++++++------------
src/include/replication/reorderbuffer.h | 27 ++++------------
4 files changed, 68 insertions(+), 41 deletions(-)
diff --git a/contrib/test_decoding/expected/stream.out b/contrib/test_decoding/expected/stream.out
index e1c3bc8..1e93955 100644
--- a/contrib/test_decoding/expected/stream.out
+++ b/contrib/test_decoding/expected/stream.out
@@ -82,6 +82,47 @@ SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL,NULL, 'incl
committing streamed transaction
(13 rows)
+-- streaming test for toast with multi-insert
+SELECT 'psql -At -c "copy stream_test to stdout" ' || current_database() AS copy_command \gset
+COPY stream_test FROM program :'copy_command';
+SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL,NULL, 'include-xids', '0', 'skip-empty-xacts', '1', 'stream-changes', '1');
+ data
+------------------------------------------
+ opening a streamed block for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ closing a streamed block for transaction
+ committing streamed transaction
+(33 rows)
+
DROP TABLE stream_test;
SELECT pg_drop_replication_slot('regression_slot');
pg_drop_replication_slot
diff --git a/contrib/test_decoding/sql/stream.sql b/contrib/test_decoding/sql/stream.sql
index ce86c81..cad028b 100644
--- a/contrib/test_decoding/sql/stream.sql
+++ b/contrib/test_decoding/sql/stream.sql
@@ -26,5 +26,10 @@ SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'inc
INSERT INTO stream_test SELECT repeat('a', 6000) || g.i FROM generate_series(1, 10) g(i);
SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL,NULL, 'include-xids', '0', 'skip-empty-xacts', '1', 'stream-changes', '1');
+-- streaming test for toast with multi-insert
+SELECT 'psql -At -c "copy stream_test to stdout" ' || current_database() AS copy_command \gset
+COPY stream_test FROM program :'copy_command';
+SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL,NULL, 'include-xids', '0', 'skip-empty-xacts', '1', 'stream-changes', '1');
+
DROP TABLE stream_test;
SELECT pg_drop_replication_slot('regression_slot');
diff --git a/src/backend/replication/logical/reorderbuffer.c b/src/backend/replication/logical/reorderbuffer.c
index b0ab91c..4401608 100644
--- a/src/backend/replication/logical/reorderbuffer.c
+++ b/src/backend/replication/logical/reorderbuffer.c
@@ -705,31 +705,27 @@ ReorderBufferProcessPartialChange(ReorderBuffer *rb, ReorderBufferTXN *txn,
toptxn = txn;
/*
- * Set the toast insert bit whenever we get toast insert to indicate a
- * partial change and clear it when we get the insert or update on main
- * table (Both update and insert will do the insert in the toast table).
+ * If this is a toast change then set a bit to indicate a partial change
+ * and clear it when we get the insert or update on main table (Both update
+ * and insert will do the insert in the toast table) and
+ * clear_toast_afterwards is set.
*/
if (toast_insert)
- toptxn->txn_flags |= RBTXN_HAS_TOAST_INSERT;
- else if (rbtxn_has_toast_insert(toptxn) &&
- IsInsertOrUpdate(change->action))
- toptxn->txn_flags &= ~RBTXN_HAS_TOAST_INSERT;
+ toptxn->txn_flags |= RBTXN_HAS_PARTIAL_CHANGE;
+ else if (rbtxn_has_partial_change(toptxn) &&
+ IsInsertOrUpdate(change->action) &&
+ change->data.tp.clear_toast_afterwards)
+ toptxn->txn_flags &= ~RBTXN_HAS_PARTIAL_CHANGE;
/*
- * Set the spec insert bit whenever we get the speculative insert to
+ * Set the partial change bit whenever we get the speculative insert to
* indicate the partial change and clear the same on speculative confirm.
*/
if (IsSpecInsert(change->action))
- toptxn->txn_flags |= RBTXN_HAS_SPEC_INSERT;
- else if (IsSpecConfirm(change->action))
- {
- /*
- * Speculative confirm change must be preceded by speculative
- * insertion.
- */
- Assert(rbtxn_has_spec_insert(toptxn));
- toptxn->txn_flags &= ~RBTXN_HAS_SPEC_INSERT;
- }
+ toptxn->txn_flags |= RBTXN_HAS_PARTIAL_CHANGE;
+ else if (rbtxn_has_partial_change(toptxn) &&
+ IsSpecConfirm(change->action))
+ toptxn->txn_flags &= ~RBTXN_HAS_PARTIAL_CHANGE;
/*
* Stream the transaction if it is serialized before and the changes are
@@ -741,7 +737,7 @@ ReorderBufferProcessPartialChange(ReorderBuffer *rb, ReorderBufferTXN *txn,
* changes. Delaying such transactions would increase apply lag for them.
*/
if (ReorderBufferCanStartStreaming(rb) &&
- !(rbtxn_has_incomplete_tuple(toptxn)) &&
+ !(rbtxn_has_partial_change(toptxn)) &&
rbtxn_is_serialized(txn))
ReorderBufferStreamTXN(rb, toptxn);
}
@@ -3399,7 +3395,7 @@ ReorderBufferLargestTopTXN(ReorderBuffer *rb)
Assert(txn->base_snapshot != NULL);
if ((largest == NULL || txn->total_size > largest_size) &&
- (txn->total_size > 0) && !(rbtxn_has_incomplete_tuple(txn)))
+ (txn->total_size > 0) && !(rbtxn_has_partial_change(txn)))
{
largest = txn;
largest_size = txn->total_size;
diff --git a/src/include/replication/reorderbuffer.h b/src/include/replication/reorderbuffer.h
index 53cdfa5..ced9f3e 100644
--- a/src/include/replication/reorderbuffer.h
+++ b/src/include/replication/reorderbuffer.h
@@ -172,10 +172,9 @@ typedef struct ReorderBufferChange
#define RBTXN_IS_SERIALIZED 0x0004
#define RBTXN_IS_SERIALIZED_CLEAR 0x0008
#define RBTXN_IS_STREAMED 0x0010
-#define RBTXN_HAS_TOAST_INSERT 0x0020
-#define RBTXN_HAS_SPEC_INSERT 0x0040
-#define RBTXN_PREPARE 0x0080
-#define RBTXN_SKIPPED_PREPARE 0x0100
+#define RBTXN_HAS_PARTIAL_CHANGE 0x0020
+#define RBTXN_PREPARE 0x0040
+#define RBTXN_SKIPPED_PREPARE 0x0080
/* Does the transaction have catalog changes? */
#define rbtxn_has_catalog_changes(txn) \
@@ -201,24 +200,10 @@ typedef struct ReorderBufferChange
((txn)->txn_flags & RBTXN_IS_SERIALIZED_CLEAR) != 0 \
)
-/* This transaction's changes has toast insert, without main table insert. */
-#define rbtxn_has_toast_insert(txn) \
+/* This transaction's changes has partial changes? */
+#define rbtxn_has_partial_change(txn) \
( \
- ((txn)->txn_flags & RBTXN_HAS_TOAST_INSERT) != 0 \
-)
-/*
- * This transaction's changes has speculative insert, without speculative
- * confirm.
- */
-#define rbtxn_has_spec_insert(txn) \
-( \
- ((txn)->txn_flags & RBTXN_HAS_SPEC_INSERT) != 0 \
-)
-
-/* Check whether this transaction has an incomplete change. */
-#define rbtxn_has_incomplete_tuple(txn) \
-( \
- rbtxn_has_toast_insert(txn) || rbtxn_has_spec_insert(txn) \
+ ((txn)->txn_flags & RBTXN_HAS_PARTIAL_CHANGE) != 0 \
)
/*
--
1.8.3.1
Re: Assertion failure while streaming toasted data
On Tue, May 25, 2021 at 6:43 PM Dilip Kumar <dilipbalaut@gmail.com> wrote:
I have also added a test case for this.
Is that test good enough to trigger the original bug? In my experience, I
had to add a lot more tuples before the logical_decoding_work_mem
threshold was crossed and the streaming kicked in. I would suggest running
the test without the fix and check if the assertion hits. If so, we are
good to go.
Thanks,
Pavan
--
Pavan Deolasee
EnterpriseDB: https://www.enterprisedb..com
Re: Assertion failure while streaming toasted data
On Tue, May 25, 2021 at 6:50 PM Pavan Deolasee <pavan.deolasee@gmail.com> wrote:
Is that test good enough to trigger the original bug? In my experience, I had to add a lot more tuples before the logical_decoding_work_mem threshold was crossed and the streaming kicked in. I would suggest running the test without the fix and check if the assertion hits. If so, we are good to go.
Yes, it is reproducing without fix, I already tested it. Basically, I
am using the "stream_test" table in "copy stream_test to stdout""
command which already has 20 toasted tuples, each of size 6000 bytes
so that is big enough to cross 64kB.
--
Regards,
Dilip Kumar
EnterpriseDB: http://www.enterprisedb.com
Re: Assertion failure while streaming toasted data
On Tue, May 25, 2021 at 6:55 PM Dilip Kumar <dilipbalaut@gmail.com> wrote:
On Tue, May 25, 2021 at 6:50 PM Pavan Deolasee <pavan.deolasee@gmail.com>
wrote:Is that test good enough to trigger the original bug? In my experience,
I had to add a lot more tuples before the logical_decoding_work_mem
threshold was crossed and the streaming kicked in. I would suggest running
the test without the fix and check if the assertion hits. If so, we are
good to go.Yes, it is reproducing without fix, I already tested it. Basically, I
am using the "stream_test" table in "copy stream_test to stdout""
command which already has 20 toasted tuples, each of size 6000 bytes
so that is big enough to cross 64kB.
Ok, great! Thanks for confirming.
Thanks,
Pavan
--
Pavan Deolasee
EnterpriseDB: https://www.enterprisedb..com
Re: Assertion failure while streaming toasted data
On Tue, May 25, 2021 at 6:43 PM Dilip Kumar <dilipbalaut@gmail.com> wrote:
On Tue, May 25, 2021 at 5:46 PM Dilip Kumar <dilipbalaut@gmail.com> wrote:
On Tue, May 25, 2021 at 4:50 PM Amit Kapila <amit.kapila16@gmail.com> wrote:
Your patch will fix the reported scenario but I don't like the way
multi_insert flag is used to detect incomplete tuple. One problem
could be that even when there are no toast inserts, it won't allow to
stream unless we get the last tuple of multi insert WAL. How about
changing the code such that when we are clearing the toast flag, we
additionally check 'clear_toast_afterwards' flag?Yes, that can be done, I will fix this in the next version of the patch.
I have fixed as per the suggestion, and as per the offlist discussion,
I have merged the TOAST and SPEC insert flag and created a single
PARTIAL_CHANGE flag.
I have also added a test case for this.
When I am trying to execute the new test independently in windows, I
am getting the below error:
'psql' is not recognized as an internal or external command,
operable program or batch file.
2021-05-26 09:09:24.399 IST [3188] ERROR: program "psql -At -c "copy
stream_test to stdout" contrib_regression" failed
2021-05-26 09:09:24.399 IST [3188] DETAIL: child process exited with
exit code 1
2021-05-26 09:09:24.399 IST [3188] STATEMENT: COPY stream_test FROM
program 'psql -At -c "copy stream_test to stdout" contrib_regression';
I have followed below steps:
1. Run the server
2. from command prompt, in test_decoding folder, execute,
pg_regress.exe --bindir=d:/WorkSpace/PostgreSQL/master/installation/bin
--dbname=contrib_regression stream
I searched and didn't find any similar existing tests. Can we think of
any other way to test this code path? We already have one copy test in
toast.sql, isn't it possible to write a similar test here?
--
With Regards,
Amit Kapila.
Re: Assertion failure while streaming toasted data
On Wed, May 26, 2021 at 11:19 AM Amit Kapila <amit.kapila16@gmail.com>
wrote:
I searched and didn't find any similar existing tests. Can we think of
any other way to test this code path? We already have one copy test in
toast.sql, isn't it possible to write a similar test here?
Yeah, I wasn't very confident about this either. I just wrote it to reduce
the test footprint in the reproducer. I think we can simply include a lot
more data and do the copy via stdin.
Alternatively, we can reduce logical_decoding_work_mem minimum value and
run the test with a smaller value. But that same GUC is used to decide
spilling txn to disk as well. So I am not sure if reducing the compile time
default is acceptable or not.
Thanks,
Pavan
--
Pavan Deolasee
EnterpriseDB: https://www.enterprisedb..com
Re: Assertion failure while streaming toasted data
On Wed, May 26, 2021 at 11:19 AM Amit Kapila <amit.kapila16@gmail.com> wrote:
On Tue, May 25, 2021 at 6:43 PM Dilip Kumar <dilipbalaut@gmail.com> wrote:
On Tue, May 25, 2021 at 5:46 PM Dilip Kumar <dilipbalaut@gmail.com> wrote:
On Tue, May 25, 2021 at 4:50 PM Amit Kapila <amit.kapila16@gmail.com> wrote:
Your patch will fix the reported scenario but I don't like the way
multi_insert flag is used to detect incomplete tuple. One problem
could be that even when there are no toast inserts, it won't allow to
stream unless we get the last tuple of multi insert WAL. How about
changing the code such that when we are clearing the toast flag, we
additionally check 'clear_toast_afterwards' flag?Yes, that can be done, I will fix this in the next version of the patch.
I have fixed as per the suggestion, and as per the offlist discussion,
I have merged the TOAST and SPEC insert flag and created a single
PARTIAL_CHANGE flag.
I have also added a test case for this.When I am trying to execute the new test independently in windows, I
am getting the below error:
'psql' is not recognized as an internal or external command,
operable program or batch file.
2021-05-26 09:09:24.399 IST [3188] ERROR: program "psql -At -c "copy
stream_test to stdout" contrib_regression" failed
2021-05-26 09:09:24.399 IST [3188] DETAIL: child process exited with
exit code 1
2021-05-26 09:09:24.399 IST [3188] STATEMENT: COPY stream_test FROM
program 'psql -At -c "copy stream_test to stdout" contrib_regression';I have followed below steps:
1. Run the server
2. from command prompt, in test_decoding folder, execute,
pg_regress.exe --bindir=d:/WorkSpace/PostgreSQL/master/installation/bin
--dbname=contrib_regression stream
Ok
I searched and didn't find any similar existing tests. Can we think of
any other way to test this code path? We already have one copy test in
toast.sql, isn't it possible to write a similar test here?
I will check that and let you know.
--
Regards,
Dilip Kumar
EnterpriseDB: http://www.enterprisedb.com
Re: Assertion failure while streaming toasted data
On Wed, May 26, 2021 at 11:37 AM Pavan Deolasee
<pavan.deolasee@gmail.com> wrote:
Yeah, I wasn't very confident about this either. I just wrote it to reduce the test footprint in the reproducer. I think we can simply include a lot more data and do the copy via stdin.
That is one way and if we don't find any better way we can do that.
Alternatively, we can reduce logical_decoding_work_mem minimum value and run the test with a smaller value. But that same GUC is used to decide spilling txn to disk as well. So I am not sure if reducing the compile time default is acceptable or not.
In the test decoding config, it is already set to a minimum value which is 64k.
--
Regards,
Dilip Kumar
EnterpriseDB: http://www.enterprisedb.com
Re: Assertion failure while streaming toasted data
On Wed, May 26, 2021 at 11:53 AM Dilip Kumar <dilipbalaut@gmail.com> wrote:
On Wed, May 26, 2021 at 11:19 AM Amit Kapila <amit.kapila16@gmail.com> wrote:
I searched and didn't find any similar existing tests. Can we think of
any other way to test this code path? We already have one copy test in
toast.sql, isn't it possible to write a similar test here?I will check that and let you know.
I have followed this approach to write the test.
--
Regards,
Dilip Kumar
EnterpriseDB: http://www.enterprisedb.com
Attachments:
v3-0001-Fix-bug-while-streaming-the-multi-insert-toast-ch.patchtext/x-patch; charset=US-ASCII; name=v3-0001-Fix-bug-while-streaming-the-multi-insert-toast-ch.patchDownload
From af116766c8562c36eb00c836505fe4725d19f81d Mon Sep 17 00:00:00 2001
From: Dilip Kumar <dilipkumar@localhost.localdomain>
Date: Tue, 25 May 2021 14:51:45 +0530
Subject: [PATCH v3] Fix bug while streaming the multi-insert toast changes
While processing the multi-insert we can not clean the toast untill
we get the last insert of the multi-insert. So mark the transaction
incomplete for streaming if we get any multi-insert change, and keep
it set until we get the last tuple of the multi-insert.
---
contrib/test_decoding/expected/stream.out | 24 +++++++++++++++++
contrib/test_decoding/sql/stream.sql | 18 +++++++++++++
src/backend/replication/logical/reorderbuffer.c | 36 +++++++++++--------------
src/include/replication/reorderbuffer.h | 27 +++++--------------
4 files changed, 64 insertions(+), 41 deletions(-)
diff --git a/contrib/test_decoding/expected/stream.out b/contrib/test_decoding/expected/stream.out
index e1c3bc8..0f21dcb 100644
--- a/contrib/test_decoding/expected/stream.out
+++ b/contrib/test_decoding/expected/stream.out
@@ -82,6 +82,30 @@ SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL,NULL, 'incl
committing streamed transaction
(13 rows)
+-- streaming test for toast with multi-insert
+\COPY stream_test FROM STDIN
+SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL,NULL, 'include-xids', '0', 'skip-empty-xacts', '1', 'stream-changes', '1');
+ data
+------------------------------------------
+ opening a streamed block for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ closing a streamed block for transaction
+ opening a streamed block for transaction
+ streaming change for transaction
+ closing a streamed block for transaction
+ committing streamed transaction
+(17 rows)
+
DROP TABLE stream_test;
SELECT pg_drop_replication_slot('regression_slot');
pg_drop_replication_slot
diff --git a/contrib/test_decoding/sql/stream.sql b/contrib/test_decoding/sql/stream.sql
index ce86c81..4feec62 100644
--- a/contrib/test_decoding/sql/stream.sql
+++ b/contrib/test_decoding/sql/stream.sql
@@ -26,5 +26,23 @@ SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'inc
INSERT INTO stream_test SELECT repeat('a', 6000) || g.i FROM generate_series(1, 10) g(i);
SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL,NULL, 'include-xids', '0', 'skip-empty-xacts', '1', 'stream-changes', '1');
+-- streaming test for toast with multi-insert
+\COPY stream_test FROM STDIN
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+\.
+
+SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL,NULL, 'include-xids', '0', 'skip-empty-xacts', '1', 'stream-changes', '1');
+
DROP TABLE stream_test;
SELECT pg_drop_replication_slot('regression_slot');
diff --git a/src/backend/replication/logical/reorderbuffer.c b/src/backend/replication/logical/reorderbuffer.c
index b0ab91c..4401608 100644
--- a/src/backend/replication/logical/reorderbuffer.c
+++ b/src/backend/replication/logical/reorderbuffer.c
@@ -705,31 +705,27 @@ ReorderBufferProcessPartialChange(ReorderBuffer *rb, ReorderBufferTXN *txn,
toptxn = txn;
/*
- * Set the toast insert bit whenever we get toast insert to indicate a
- * partial change and clear it when we get the insert or update on main
- * table (Both update and insert will do the insert in the toast table).
+ * If this is a toast change then set a bit to indicate a partial change
+ * and clear it when we get the insert or update on main table (Both update
+ * and insert will do the insert in the toast table) and
+ * clear_toast_afterwards is set.
*/
if (toast_insert)
- toptxn->txn_flags |= RBTXN_HAS_TOAST_INSERT;
- else if (rbtxn_has_toast_insert(toptxn) &&
- IsInsertOrUpdate(change->action))
- toptxn->txn_flags &= ~RBTXN_HAS_TOAST_INSERT;
+ toptxn->txn_flags |= RBTXN_HAS_PARTIAL_CHANGE;
+ else if (rbtxn_has_partial_change(toptxn) &&
+ IsInsertOrUpdate(change->action) &&
+ change->data.tp.clear_toast_afterwards)
+ toptxn->txn_flags &= ~RBTXN_HAS_PARTIAL_CHANGE;
/*
- * Set the spec insert bit whenever we get the speculative insert to
+ * Set the partial change bit whenever we get the speculative insert to
* indicate the partial change and clear the same on speculative confirm.
*/
if (IsSpecInsert(change->action))
- toptxn->txn_flags |= RBTXN_HAS_SPEC_INSERT;
- else if (IsSpecConfirm(change->action))
- {
- /*
- * Speculative confirm change must be preceded by speculative
- * insertion.
- */
- Assert(rbtxn_has_spec_insert(toptxn));
- toptxn->txn_flags &= ~RBTXN_HAS_SPEC_INSERT;
- }
+ toptxn->txn_flags |= RBTXN_HAS_PARTIAL_CHANGE;
+ else if (rbtxn_has_partial_change(toptxn) &&
+ IsSpecConfirm(change->action))
+ toptxn->txn_flags &= ~RBTXN_HAS_PARTIAL_CHANGE;
/*
* Stream the transaction if it is serialized before and the changes are
@@ -741,7 +737,7 @@ ReorderBufferProcessPartialChange(ReorderBuffer *rb, ReorderBufferTXN *txn,
* changes. Delaying such transactions would increase apply lag for them.
*/
if (ReorderBufferCanStartStreaming(rb) &&
- !(rbtxn_has_incomplete_tuple(toptxn)) &&
+ !(rbtxn_has_partial_change(toptxn)) &&
rbtxn_is_serialized(txn))
ReorderBufferStreamTXN(rb, toptxn);
}
@@ -3399,7 +3395,7 @@ ReorderBufferLargestTopTXN(ReorderBuffer *rb)
Assert(txn->base_snapshot != NULL);
if ((largest == NULL || txn->total_size > largest_size) &&
- (txn->total_size > 0) && !(rbtxn_has_incomplete_tuple(txn)))
+ (txn->total_size > 0) && !(rbtxn_has_partial_change(txn)))
{
largest = txn;
largest_size = txn->total_size;
diff --git a/src/include/replication/reorderbuffer.h b/src/include/replication/reorderbuffer.h
index 53cdfa5..ced9f3e 100644
--- a/src/include/replication/reorderbuffer.h
+++ b/src/include/replication/reorderbuffer.h
@@ -172,10 +172,9 @@ typedef struct ReorderBufferChange
#define RBTXN_IS_SERIALIZED 0x0004
#define RBTXN_IS_SERIALIZED_CLEAR 0x0008
#define RBTXN_IS_STREAMED 0x0010
-#define RBTXN_HAS_TOAST_INSERT 0x0020
-#define RBTXN_HAS_SPEC_INSERT 0x0040
-#define RBTXN_PREPARE 0x0080
-#define RBTXN_SKIPPED_PREPARE 0x0100
+#define RBTXN_HAS_PARTIAL_CHANGE 0x0020
+#define RBTXN_PREPARE 0x0040
+#define RBTXN_SKIPPED_PREPARE 0x0080
/* Does the transaction have catalog changes? */
#define rbtxn_has_catalog_changes(txn) \
@@ -201,24 +200,10 @@ typedef struct ReorderBufferChange
((txn)->txn_flags & RBTXN_IS_SERIALIZED_CLEAR) != 0 \
)
-/* This transaction's changes has toast insert, without main table insert. */
-#define rbtxn_has_toast_insert(txn) \
+/* This transaction's changes has partial changes? */
+#define rbtxn_has_partial_change(txn) \
( \
- ((txn)->txn_flags & RBTXN_HAS_TOAST_INSERT) != 0 \
-)
-/*
- * This transaction's changes has speculative insert, without speculative
- * confirm.
- */
-#define rbtxn_has_spec_insert(txn) \
-( \
- ((txn)->txn_flags & RBTXN_HAS_SPEC_INSERT) != 0 \
-)
-
-/* Check whether this transaction has an incomplete change. */
-#define rbtxn_has_incomplete_tuple(txn) \
-( \
- rbtxn_has_toast_insert(txn) || rbtxn_has_spec_insert(txn) \
+ ((txn)->txn_flags & RBTXN_HAS_PARTIAL_CHANGE) != 0 \
)
/*
--
1.8.3.1
Re: Assertion failure while streaming toasted data
On Wed, May 26, 2021 at 1:47 PM Dilip Kumar <dilipbalaut@gmail.com> wrote:
On Wed, May 26, 2021 at 11:53 AM Dilip Kumar <dilipbalaut@gmail.com> wrote:
On Wed, May 26, 2021 at 11:19 AM Amit Kapila <amit.kapila16@gmail.com> wrote:
I searched and didn't find any similar existing tests. Can we think of
any other way to test this code path? We already have one copy test in
toast.sql, isn't it possible to write a similar test here?I will check that and let you know.
I have followed this approach to write the test.
The changes look good to me. I have made minor modifications in the
comments, see attached. Let me know what do you think?
--
With Regards,
Amit Kapila.
Attachments:
v4-0001-Fix-assertion-during-streaming-of-multi-insert-to.patchapplication/octet-stream; name=v4-0001-Fix-assertion-during-streaming-of-multi-insert-to.patchDownload
From 13e7501f3b231eb64fdc50e2013b727e02a645c2 Mon Sep 17 00:00:00 2001
From: Amit Kapila <akapila@postgresql.org>
Date: Wed, 26 May 2021 17:16:29 +0530
Subject: [PATCH v4] Fix assertion during streaming of multi-insert toast
changes.
While decoding the multi-insert WAL we can't clean the toast untill we get
the last insert of that WAL record. Now if we stream the changes before we
get the last change, the memory for toast chunks won't be released and we
expect the txn to have streamed all changes after streaming. This
restriction is mainly to ensure the correctness of streamed transactions
and it doesn't seem worth uplifting such a restriction just to allow this
case because anyway we will stream the transaction once such an insert is
complete.
Reported-by: Pavan Deolasee
Author: Dilip Kumar
Reviewed-by: Pavan Deolasee, Amit Kapila
Discussion: https://postgr.es/m/CABOikdN-_858zojYN-2tNcHiVTw-nhxPwoQS4quExeweQfG1Ug@mail.gmail.com
---
contrib/test_decoding/expected/stream.out | 24 +++++++++++++
contrib/test_decoding/sql/stream.sql | 18 ++++++++++
src/backend/replication/logical/reorderbuffer.c | 46 ++++++++++++++-----------
src/include/replication/reorderbuffer.h | 27 ++++-----------
4 files changed, 73 insertions(+), 42 deletions(-)
diff --git a/contrib/test_decoding/expected/stream.out b/contrib/test_decoding/expected/stream.out
index e1c3bc8..0f21dcb 100644
--- a/contrib/test_decoding/expected/stream.out
+++ b/contrib/test_decoding/expected/stream.out
@@ -82,6 +82,30 @@ SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL,NULL, 'incl
committing streamed transaction
(13 rows)
+-- streaming test for toast with multi-insert
+\COPY stream_test FROM STDIN
+SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL,NULL, 'include-xids', '0', 'skip-empty-xacts', '1', 'stream-changes', '1');
+ data
+------------------------------------------
+ opening a streamed block for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ streaming change for transaction
+ closing a streamed block for transaction
+ opening a streamed block for transaction
+ streaming change for transaction
+ closing a streamed block for transaction
+ committing streamed transaction
+(17 rows)
+
DROP TABLE stream_test;
SELECT pg_drop_replication_slot('regression_slot');
pg_drop_replication_slot
diff --git a/contrib/test_decoding/sql/stream.sql b/contrib/test_decoding/sql/stream.sql
index ce86c81..4feec62 100644
--- a/contrib/test_decoding/sql/stream.sql
+++ b/contrib/test_decoding/sql/stream.sql
@@ -26,5 +26,23 @@ SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'inc
INSERT INTO stream_test SELECT repeat('a', 6000) || g.i FROM generate_series(1, 10) g(i);
SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL,NULL, 'include-xids', '0', 'skip-empty-xacts', '1', 'stream-changes', '1');
+-- streaming test for toast with multi-insert
+\COPY stream_test FROM STDIN
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+\.
+
+SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL,NULL, 'include-xids', '0', 'skip-empty-xacts', '1', 'stream-changes', '1');
+
DROP TABLE stream_test;
SELECT pg_drop_replication_slot('regression_slot');
diff --git a/src/backend/replication/logical/reorderbuffer.c b/src/backend/replication/logical/reorderbuffer.c
index b0ab91c..2d9e127 100644
--- a/src/backend/replication/logical/reorderbuffer.c
+++ b/src/backend/replication/logical/reorderbuffer.c
@@ -705,31 +705,35 @@ ReorderBufferProcessPartialChange(ReorderBuffer *rb, ReorderBufferTXN *txn,
toptxn = txn;
/*
- * Set the toast insert bit whenever we get toast insert to indicate a
- * partial change and clear it when we get the insert or update on main
- * table (Both update and insert will do the insert in the toast table).
+ * Indicate a partial change for toast inserts. The change will be
+ * considered as complete once we get the insert or update on the main
+ * table and we are sure that the pending toast chunks are not required
+ * anymore.
+ *
+ * If we allow streaming when there are pending toast chunks then such
+ * chunks won't be released till the insert (multi_insert) is complete and
+ * we expect the txn to have streamed all changes after streaming. This
+ * restriction is mainly to ensure the correctness of streamed
+ * transactions and it doesn't seem worth uplifting such a restriction
+ * just to allow this case because anyway we will stream the transaction
+ * once such an insert is complete.
*/
if (toast_insert)
- toptxn->txn_flags |= RBTXN_HAS_TOAST_INSERT;
- else if (rbtxn_has_toast_insert(toptxn) &&
- IsInsertOrUpdate(change->action))
- toptxn->txn_flags &= ~RBTXN_HAS_TOAST_INSERT;
+ toptxn->txn_flags |= RBTXN_HAS_PARTIAL_CHANGE;
+ else if (rbtxn_has_partial_change(toptxn) &&
+ IsInsertOrUpdate(change->action) &&
+ change->data.tp.clear_toast_afterwards)
+ toptxn->txn_flags &= ~RBTXN_HAS_PARTIAL_CHANGE;
/*
- * Set the spec insert bit whenever we get the speculative insert to
- * indicate the partial change and clear the same on speculative confirm.
+ * Indicate a partial change for speculative inserts. The change will be
+ * considered as complete once we get the speculative confirm token.
*/
if (IsSpecInsert(change->action))
- toptxn->txn_flags |= RBTXN_HAS_SPEC_INSERT;
- else if (IsSpecConfirm(change->action))
- {
- /*
- * Speculative confirm change must be preceded by speculative
- * insertion.
- */
- Assert(rbtxn_has_spec_insert(toptxn));
- toptxn->txn_flags &= ~RBTXN_HAS_SPEC_INSERT;
- }
+ toptxn->txn_flags |= RBTXN_HAS_PARTIAL_CHANGE;
+ else if (rbtxn_has_partial_change(toptxn) &&
+ IsSpecConfirm(change->action))
+ toptxn->txn_flags &= ~RBTXN_HAS_PARTIAL_CHANGE;
/*
* Stream the transaction if it is serialized before and the changes are
@@ -741,7 +745,7 @@ ReorderBufferProcessPartialChange(ReorderBuffer *rb, ReorderBufferTXN *txn,
* changes. Delaying such transactions would increase apply lag for them.
*/
if (ReorderBufferCanStartStreaming(rb) &&
- !(rbtxn_has_incomplete_tuple(toptxn)) &&
+ !(rbtxn_has_partial_change(toptxn)) &&
rbtxn_is_serialized(txn))
ReorderBufferStreamTXN(rb, toptxn);
}
@@ -3399,7 +3403,7 @@ ReorderBufferLargestTopTXN(ReorderBuffer *rb)
Assert(txn->base_snapshot != NULL);
if ((largest == NULL || txn->total_size > largest_size) &&
- (txn->total_size > 0) && !(rbtxn_has_incomplete_tuple(txn)))
+ (txn->total_size > 0) && !(rbtxn_has_partial_change(txn)))
{
largest = txn;
largest_size = txn->total_size;
diff --git a/src/include/replication/reorderbuffer.h b/src/include/replication/reorderbuffer.h
index 53cdfa5..0c6e9d1 100644
--- a/src/include/replication/reorderbuffer.h
+++ b/src/include/replication/reorderbuffer.h
@@ -172,10 +172,9 @@ typedef struct ReorderBufferChange
#define RBTXN_IS_SERIALIZED 0x0004
#define RBTXN_IS_SERIALIZED_CLEAR 0x0008
#define RBTXN_IS_STREAMED 0x0010
-#define RBTXN_HAS_TOAST_INSERT 0x0020
-#define RBTXN_HAS_SPEC_INSERT 0x0040
-#define RBTXN_PREPARE 0x0080
-#define RBTXN_SKIPPED_PREPARE 0x0100
+#define RBTXN_HAS_PARTIAL_CHANGE 0x0020
+#define RBTXN_PREPARE 0x0040
+#define RBTXN_SKIPPED_PREPARE 0x0080
/* Does the transaction have catalog changes? */
#define rbtxn_has_catalog_changes(txn) \
@@ -201,24 +200,10 @@ typedef struct ReorderBufferChange
((txn)->txn_flags & RBTXN_IS_SERIALIZED_CLEAR) != 0 \
)
-/* This transaction's changes has toast insert, without main table insert. */
-#define rbtxn_has_toast_insert(txn) \
+/* Has this transaction contains partial changes? */
+#define rbtxn_has_partial_change(txn) \
( \
- ((txn)->txn_flags & RBTXN_HAS_TOAST_INSERT) != 0 \
-)
-/*
- * This transaction's changes has speculative insert, without speculative
- * confirm.
- */
-#define rbtxn_has_spec_insert(txn) \
-( \
- ((txn)->txn_flags & RBTXN_HAS_SPEC_INSERT) != 0 \
-)
-
-/* Check whether this transaction has an incomplete change. */
-#define rbtxn_has_incomplete_tuple(txn) \
-( \
- rbtxn_has_toast_insert(txn) || rbtxn_has_spec_insert(txn) \
+ ((txn)->txn_flags & RBTXN_HAS_PARTIAL_CHANGE) != 0 \
)
/*
--
1.8.3.1
Re: Assertion failure while streaming toasted data
On Wed, May 26, 2021 at 5:28 PM Amit Kapila <amit.kapila16@gmail.com> wrote:
On Wed, May 26, 2021 at 1:47 PM Dilip Kumar <dilipbalaut@gmail.com> wrote:
On Wed, May 26, 2021 at 11:53 AM Dilip Kumar <dilipbalaut@gmail.com> wrote:
On Wed, May 26, 2021 at 11:19 AM Amit Kapila <amit.kapila16@gmail.com> wrote:
I searched and didn't find any similar existing tests. Can we think of
any other way to test this code path? We already have one copy test in
toast.sql, isn't it possible to write a similar test here?I will check that and let you know.
I have followed this approach to write the test.
The changes look good to me. I have made minor modifications in the
comments, see attached. Let me know what do you think?
Your modification looks good to me. Thanks!
--
Regards,
Dilip Kumar
EnterpriseDB: http://www.enterprisedb.com
Re: Assertion failure while streaming toasted data
On Tue, May 25, 2021 at 12:51 PM Michael Paquier <michael@paquier.xyz> wrote:
On Tue, May 25, 2021 at 12:06:38PM +0530, Pavan Deolasee wrote:
While working on an output plugin that uses streaming protocol, I hit an
assertion failure. Further investigations revealed a possible bug in core
Postgres. This must be new to PG14 since streaming support is new to this
release. I extended the test_decoding regression test to demonstrate the
failure. PFAThanks, Pavan. I have added an open item for this one.
I have pushed this a few days ago [1]https://git.postgresql.org/gitweb/?p=postgresql.git;a=commitdiff;h=6f4bdf81529fdaf6744875b0be99ecb9bfb3b7e0 and closed the open item
corresponding to it.
--
With Regards,
Amit Kapila.