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Commit8e7811e

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Eliminate replication protocol error related to IDENTIFY_SYSTEM.
The requirement that IDENTIFY_SYSTEM be run before START_REPLICATIONwas both undocumented and unnecessary. Remove the error and ensurethat ThisTimeLineID is initialized in START_REPLICATION.Elect not to backport because this requirement was expected behavior(even if inconsistently enforced), and is not likely to cause anymajor problem.Author: Jeff DavisReviewed-by: Andres FreundDiscussion:https://postgr.es/m/de4bbf05b7cd94227841c433ea6ff71d2130c713.camel%40j-davis.com
1 parent31e8cfa commit8e7811e

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‎src/backend/replication/walsender.c

Lines changed: 1 addition & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -573,11 +573,6 @@ StartReplication(StartReplicationCmd *cmd)
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StringInfoDatabuf;
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XLogRecPtrFlushPtr;
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576-
if (ThisTimeLineID==0)
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ereport(ERROR,
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(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
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errmsg("IDENTIFY_SYSTEM has not been run before START_REPLICATION")));
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/* create xlogreader for physical replication */
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xlogreader=
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XLogReaderAllocate(wal_segment_size,NULL,
@@ -619,6 +614,7 @@ StartReplication(StartReplicationCmd *cmd)
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* that. Otherwise use the timeline of the last replayed record, which is
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* kept in ThisTimeLineID.
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*/
617+
am_cascading_walsender=RecoveryInProgress();
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if (am_cascading_walsender)
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{
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/* this also updates ThisTimeLineID */

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