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BRIN: fix bug in xlog backup block counting

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The code that generates the BRIN_XLOG_UPDATE removes the buffer
reference when the page that's target for the updated tuple is freshly
initialized.  This is a pretty usual optimization, but was breaking the
case where the revmap buffer, which is referenced in the same WAL
record, is getting a backup block: the replay code was using backup
block index 1, which is not valid when the update target buffer gets
pruned; the revmap buffer gets assigned 0 instead.  Make sure to use the
correct backup block index for revmap when replaying.

Bug reported by Fujii Masao.
This commit is contained in:
Alvaro Herrera 2014-11-10 18:13:49 -03:00
parent c8df9477f8
commit a590f266e4
1 changed files with 8 additions and 4 deletions
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12
src/backend/access/brin/brin_xlog.c
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@ -60,9 +60,11 @@ brin_xlog_insert_update(XLogRecPtr lsn, XLogRecord *record,
*/
if (record->xl_info & XLOG_BRIN_INIT_PAGE)
{
XLogReadBufferForRedoExtended(lsn, record, 0,
xlrec->node, MAIN_FORKNUM, blkno,
RBM_ZERO, false, &buffer);
/*
* No full-page image here. Don't try to read it, because there
* might be one for the revmap buffer, below.
*/
buffer = XLogReadBuffer(xlrec->node, blkno, true);
page = BufferGetPage(buffer);
brin_page_init(page, BRIN_PAGETYPE_REGULAR);
action = BLK_NEEDS_REDO;
@ -97,7 +99,9 @@ brin_xlog_insert_update(XLogRecPtr lsn, XLogRecord *record,
UnlockReleaseBuffer(buffer);
/* update the revmap */
action = XLogReadBufferForRedo(lsn, record, 1, xlrec->node,
action = XLogReadBufferForRedo(lsn, record,
record->xl_info & XLOG_BRIN_INIT_PAGE ? 0 : 1,
xlrec->node,
xlrec->revmapBlk, &buffer);
if (action == BLK_NEEDS_REDO)
{