pgsql: Improve subscription locking

Improve subscription locking

This avoids "tuple concurrently updated" errors when a ALTER or DROP
SUBSCRIPTION writes to pg_subscription_rel at the same time as a worker.

Author: Petr Jelinek <petr.jelinek@2ndquadrant.com>

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/cb9079cd51a2df677dc182aec72d88383b9c2a79

Modified Files
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src/backend/catalog/pg_subscription.c | 4 ++++
src/backend/commands/subscriptioncmds.c | 3 +++
2 files changed, 7 insertions(+)

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