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a8f45dee91
Previously, during shutdown, walsenders always waited until all pending data was replicated to receivers. This ensures sender and receiver stay in sync after shutdown, which is important for physical replication switchovers, but it can significantly delay shutdown. For example, in logical replication, if apply workers are blocked on locks, walsenders may wait until those locks are released, preventing shutdown from completing for a long time. This commit introduces a new GUC, wal_sender_shutdown_timeout, which specifies the maximum time a walsender waits during shutdown for all pending data to be replicated. When set, shutdown completes once all data is replicated or the timeout expires. A value of -1 (the default) disables the timeout. This can reduce shutdown time when replication is slow or stalled. However, if the timeout is reached, the sender and receiver may be left out of sync, which can be problematic for physical replication switchovers. Author: Andrey Silitskiy <a.silitskiy@postgrespro.ru> Author: Hayato Kuroda <kuroda.hayato@fujitsu.com> Reviewed-by: Ashutosh Bapat <ashutosh.bapat.oss@gmail.com> Reviewed-by: Kyotaro Horiguchi <horikyota.ntt@gmail.com> Reviewed-by: Amit Kapila <amit.kapila16@gmail.com> Reviewed-by: Dilip Kumar <dilipbalaut@gmail.com> Reviewed-by: Masahiko Sawada <sawada.mshk@gmail.com> Reviewed-by: Andres Freund <andres@anarazel.de> Reviewed-by: Takamichi Osumi <osumi.takamichi@fujitsu.com> Reviewed-by: Peter Smith <smithpb2250@gmail.com> Reviewed-by: Greg Sabino Mullane <htamfids@gmail.com> Reviewed-by: Alexander Korotkov <aekorotkov@gmail.com> Reviewed-by: Vitaly Davydov <v.davydov@postgrespro.ru> Reviewed-by: Ronan Dunklau <ronan@dunklau.fr> Reviewed-by: Michael Paquier <michael@paquier.xyz> Reviewed-by: Japin Li <japinli@hotmail.com> Reviewed-by: Fujii Masao <masao.fujii@gmail.com> Discussion: https://postgr.es/m/TYAPR01MB586668E50FC2447AD7F92491F5E89@TYAPR01MB5866.jpnprd01.prod.outlook.com |
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