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Fix pg_recvlogical avoidance of superfluous Standby Status Update.

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The defect suppressed a Standby Status Update message when bytes flushed
to disk had changed but bytes received had not changed.  If
pg_recvlogical then exited with no intervening Standby Status Update,
the next pg_recvlogical repeated already-flushed records.  The defect
could also cause superfluous messages, which are functionally harmless.
Back-patch to 9.5 (all supported versions).

Discussion: https://postgr.es/m/20200502221647.GA3941274@rfd.leadboat.com
This commit is contained in:
Noah Misch 2020-05-13 20:42:09 -07:00
parent 357012e17f
commit a267894529
1 changed files with 1 additions and 1 deletions
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2
src/bin/pg_basebackup/pg_recvlogical.c
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@ -128,7 +128,7 @@ sendFeedback(PGconn *conn, TimestampTz now, bool force, bool replyRequested)
*/
if (!force &&
last_written_lsn == output_written_lsn &&
last_fsync_lsn != output_fsync_lsn)
last_fsync_lsn == output_fsync_lsn)
return true;
if (verbose)