764d31b8ae
Previously, when wal_receiver_create_temp_slot was enabled, a timeline switch could cause the walreceiver to try to create the same temporary replication slot again on the same connection. The slot had already been created before the first streaming attempt and still existed, so the second creation attempt failed with a FATAL error such as "could not create replication slot ...". The walreceiver would later be restarted and streaming replication could continue, so this did not permanently break replication. Nevertheless, the unexpected failure is a bug and should be fixed. Fix this by tracking whether the temporary replication slot has already been created for the lifetime of the walreceiver and skipping subsequent creation attempts. Also copy the retained slot name to shared memory on each streaming attempt, since RequestXLogStreaming() clears it when streaming is restarted without a configured primary slot. This also keeps pg_stat_wal_receiver.slot_name populated after timeline switches. Backpatch to all supported versions. Author: ChangAo Chen <cca5507@qq.com> Reviewed-by: Quan Zongliang <quanzongliang@yeah.net> Reviewed-by: Fujii Masao <masao.fujii@gmail.com> Discussion: https://postgr.es/m/tencent_628FDAF814231923BC8E8357BBBC50F94207@qq.com Backpatch-through: 14
PostgreSQL Database Management System
This directory contains the source code distribution of the PostgreSQL database management system.
PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings.
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