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Adjust misleading comment in walsender.c. We try to send all WAL data that's

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been written out from shared memory, but the previous phrasing might be read
to say that we send only what's been fsync'd.
This commit is contained in:
Tom Lane 2010-06-03 23:00:14 +00:00
parent 0cc59cc1f3
commit 3ceb44fa0a
1 changed files with 8 additions and 4 deletions
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12
src/backend/replication/walsender.c
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@ -29,7 +29,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/replication/walsender.c,v 1.25 2010/06/03 22:17:32 tgl Exp $
* $PostgreSQL: pgsql/src/backend/replication/walsender.c,v 1.26 2010/06/03 23:00:14 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -641,7 +641,7 @@ XLogRead(char *buf, XLogRecPtr recptr, Size nbytes)
}
/*
* Read up to MAX_SEND_SIZE bytes of WAL that's been written (and flushed),
* Read up to MAX_SEND_SIZE bytes of WAL that's been written to disk,
* but not yet sent to the client, and send it.
*
* msgbuf is a work area in which the output message is constructed. It's
@ -662,7 +662,11 @@ XLogSend(char *msgbuf, bool *caughtup)
Size nbytes;
WalDataMessageHeader msghdr;
/* Attempt to send all records flushed to the disk already */
/*
* Attempt to send all data that's already been written out from WAL
* buffers (note it might not yet be fsync'd to disk). We cannot go
* further than that given the current implementation of XLogRead().
*/
SendRqstPtr = GetWriteRecPtr();
/* Quick exit if nothing to do */
@ -744,7 +748,7 @@ XLogSend(char *msgbuf, bool *caughtup)
pq_putmessage('d', msgbuf, 1 + sizeof(WalDataMessageHeader) + nbytes);
/* Flush pending output */
/* Flush pending output to the client */
if (pq_flush())
return false;