Horton

Re: [HACKERS] make async slave to wait for lsn to be replayed

Ivan Kartyshov <i.kartyshov@postgrespro.ru>

View thread View on postgr.es
From: Kartyshov Ivan <i.kartyshov@postgrespro.ru>
To: Alvaro Herrera <alvherre@alvh.no-ip.org>
Cc: Alexander Korotkov <aekorotkov@gmail.com>, Pavel Borisov <pashkin.elfe@gmail.com>, Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com>, Euler Taveira <euler@eulerto.com>, Thomas Munro <thomas.munro@gmail.com>, Peter Eisentraut <peter@eisentraut.org>, Amit Kapila <amit.kapila16@gmail.com>, Dilip Kumar <dilipbalaut@gmail.com>, Peter Smith <smithpb2250@gmail.com>, pgsql-hackers@lists.postgresql.org
Date: 2024-04-10T15:12:00Z
Lists: pgsql-hackers

Attachments

I did some experiments over synchronous replications and
got that cascade replication can`t be synchronous. And 
pg_wal_replay_wait() allows us to read your writes
consistency on cascade replication.
Beyond that, I added more tests on multi-standby replication
and cascade replications.

-- 
Ivan Kartyshov
Postgres Professional: www.postgrespro.com

Commits

  1. Ensure standby promotion point in 043_wal_replay_wait.pl

  2. Minor cleanup related to pg_wal_replay_wait() procedure

  3. Adjust pg_wal_replay_wait() procedure behavior on promoted standby

  4. pg_wal_replay_wait(): Fix typo in the doc

  5. Implement pg_wal_replay_wait() stored procedure

  6. Revert: Implement pg_wal_replay_wait() stored procedure

  7. Call WaitLSNCleanup() in AbortTransaction()

  8. Clarify what is protected by WaitLSNLock

  9. Use an LWLock instead of a spinlock in waitlsn.c

  10. Use the pairing heap instead of a flat array for LSN replay waiters

  11. Minor improvements for waitlsn.c

  12. Make the order of the header file includes consistent