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Improve documentation and comment for quorum-based sync replication.

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Author: Masahiko Sawada, heavily modified by me
Discussion: http://postgr.es/m/CAHGQGwEKOw=SmPLxJzkBsH6wwDBgOnVz46QjHbtsiZ-d-2RGUg@mail.gmail.com
This commit is contained in:
Fujii Masao
2017-04-19 02:58:28 +09:00
parent e240a65c7d
commit a790ed9f69
2 changed files with 21 additions and 5 deletions
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5
src/backend/replication/syncrep.c
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@ -53,6 +53,10 @@
* in the list. All the standbys appearing in the list are considered as
* candidates for quorum synchronous standbys.
*
* If neither FIRST nor ANY is specified, FIRST is used as the method.
* This is for backward compatibility with 9.6 or before where only a
* priority-based sync replication was supported.
*
* Before the standbys chosen from synchronous_standby_names can
* become the synchronous standbys they must have caught up with
* the primary; that may take some time. Once caught up,
@ -629,6 +633,7 @@ SyncRepGetNthLatestSyncRecPtr(XLogRecPtr *writePtr, XLogRecPtr *flushPtr,
i++;
}
/* Sort each array in descending order */
qsort(write_array, len, sizeof(XLogRecPtr), cmp_lsn);
qsort(flush_array, len, sizeof(XLogRecPtr), cmp_lsn);
qsort(apply_array, len, sizeof(XLogRecPtr), cmp_lsn);