async replication code
Greetings,
I am new here. Apologetic question: how can i search the archives of this
mailing list? Is there some set of magic words to put in Google? Must I
wade through 20 pages of hits? Should I download all the archives and grep?
:)
Main question: I want to understand very precisely the exact algirithm
used in PG to do asynchronous streaming replication. Eg, I want to know how
the record is written and flushed to the socket and how that happens in
time w.r.t WAL-to-disk and response to client. Will someone please give me
a head start as to where to begin my code-spelunking?
--
Otheus
otheus.uibk@gmail.com
otheus.shelling@uibk.ac.at
On 16 Mar 2016, at 15:52, otheus uibk <otheus.uibk@gmail.com> wrote:
Greetings,
Hi
I am new here. Apologetic question: how can i search the archives of this mailing list? Is there some set of magic words to put in Google? Must I wade through 20 pages of hits? Should I download all the archives and grep? :)
http://www.postgresql.org/list/
https://wiki.postgresql.org/wiki/Mailing_Lists
Main question: I want to understand very precisely the exact algirithm used in PG to do asynchronous streaming replication. Eg, I want to know how the record is written and flushed to the socket and how that happens in time w.r.t WAL-to-disk and response to client. Will someone please give me a head start as to where to begin my code-spelunking?
WAL synced to disc, then everything else is happening.
http://www.postgresql.org/docs/9.5/static/warm-standby.html#STREAMING-REPLICATION
---
Stas Kelvich
Postgres Professional: http://www.postgrespro.com
Russian Postgres Company
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I will ask again: where in the code is the asynchronous replication code?
The docs are not detailed/exact enough.
Main question: I want to understand very precisely the exact algirithm
used in PG to do asynchronous streaming replication. Eg, I want to know how
the record is written and flushed to the socket and how that happens in
time w.r.t WAL-to-disk and response to client. Will someone please give me
a head start as to where to begin my code-spelunking?WAL synced to disc, then everything else is happening.
http://www.postgresql.org/docs/9.5/static/warm-standby.html#STREAMING-REPLICATION
---
Stas Kelvich
Postgres Professional: http://www.postgrespro.com
Russian Postgres Company
--
Otheus
otheus.uibk@gmail.com
otheus.shelling@uibk.ac.at
On Wed, Mar 16, 2016 at 8:30 PM, otheus uibk <otheus.uibk@gmail.com> wrote:
I will ask again: where in the code is the asynchronous replication code?
The docs are not detailed/exact enough.
Nevermind. Thomas Munro answered my question in the General list. Quoting:
Look for WalSndWakeupRequest() in xlog.c, which expands to a call to
WalSndWakeup in walsender.c which sets latches (= a mechanism for
waking processes) on all walsenders, and see the WaitLatchOrSocket
calls in walsender.c which wait for that to happen.
--
Otheus
otheus.uibk@gmail.com
otheus.shelling@uibk.ac.at