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Pass more than the first XLogRecData entry to rm_desc, with WAL_DEBUG.

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If you compile with WAL_DEBUG and enable it with wal_debug=on, we used to
only pass the first XLogRecData entry to the rm_desc routine. I think the
original assumprion was that the first XLogRecData entry contains all the
necessary information for the rm_desc routine, but that's a pretty shaky
assumption. At least standby_redo didn't get the memo.

To fix, piece together all the data in a temporary buffer, and pass that to
the rm_desc routine.

It's been like this forever, but the patch didn't apply cleanly to
back-branches. Probably wouldn't be hard to fix the conflicts, but it's
not worth the trouble.
This commit is contained in:
Heikki Linnakangas 2014-03-26 18:04:57 +02:00
parent b69c4e65be
commit c2a6724823
1 changed files with 16 additions and 1 deletions
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17
src/backend/access/transam/xlog.c
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@ -1262,8 +1262,23 @@ begin:;
xlog_outrec(&buf, rechdr);
if (rdata->data != NULL)
{
StringInfoData recordbuf;
/*
* We have to piece together the WAL record data from the
* XLogRecData entries, so that we can pass it to the rm_desc
* function as one contiguous chunk. (but we can leave out any
* extra entries we created for backup blocks)
*/
rdt_lastnormal->next = NULL;
initStringInfo(&recordbuf);
for (;rdata != NULL; rdata = rdata->next)
appendBinaryStringInfo(&recordbuf, rdata->data, rdata->len);
appendStringInfoString(&buf, " - ");
RmgrTable[rechdr->xl_rmid].rm_desc(&buf, rechdr->xl_info, rdata->data);
RmgrTable[rechdr->xl_rmid].rm_desc(&buf, rechdr->xl_info, recordbuf.data);
pfree(recordbuf.data);
}
elog(LOG, "%s", buf.data);
pfree(buf.data);