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Fix assorted bugs in GIN's WAL replay logic.

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The original coding was quite sloppy about handling the case where
XLogReadBuffer fails (because the page has since been deleted).  This
would result in either "bad buffer id: 0" or an Assert failure during
replay, if indeed the page were no longer there.  In a couple of places
it also neglected to check whether the change had already been applied,
which would probably result in corrupted index contents.  I believe that
bug #5703 is an instance of the first problem.  These issues could show up
without replication, but only if you were unfortunate enough to crash
between modification of a GIN index and the next checkpoint.

Back-patch to 8.2, which is as far back as GIN has WAL support.
pull/1/head
Tom Lane 15 years ago
parent 220e45bf32
commit 4016bdef8a
1 changed files with 181 additions and 127 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 308
      src/backend/access/gin/ginxlog.c

308
src/backend/access/gin/ginxlog.c
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@ -77,11 +77,13 @@ ginRedoCreateIndex(XLogRecPtr lsn, XLogRecord *record)
MetaBuffer = XLogReadBuffer(*node, GIN_METAPAGE_BLKNO, true);
Assert(BufferIsValid(MetaBuffer));
page = (Page) BufferGetPage(MetaBuffer);
GinInitMetabuffer(MetaBuffer);
page = (Page) BufferGetPage(MetaBuffer);
PageSetLSN(page, lsn);
PageSetTLI(page, ThisTimeLineID);
MarkBufferDirty(MetaBuffer);
RootBuffer = XLogReadBuffer(*node, GIN_ROOT_BLKNO, true);
Assert(BufferIsValid(RootBuffer));
@ -91,11 +93,10 @@ ginRedoCreateIndex(XLogRecPtr lsn, XLogRecord *record)
PageSetLSN(page, lsn);
PageSetTLI(page, ThisTimeLineID);
MarkBufferDirty(MetaBuffer);
UnlockReleaseBuffer(MetaBuffer);
MarkBufferDirty(RootBuffer);
UnlockReleaseBuffer(RootBuffer);
UnlockReleaseBuffer(MetaBuffer);
}
static void
@ -128,21 +129,49 @@ ginRedoInsert(XLogRecPtr lsn, XLogRecord *record)
Buffer buffer;
Page page;
/* first, forget any incomplete split this insertion completes */
if (data->isData)
{
Assert(data->isDelete == FALSE);
if (!data->isLeaf && data->updateBlkno != InvalidBlockNumber)
{
PostingItem *pitem;
pitem = (PostingItem *) (XLogRecGetData(record) + sizeof(ginxlogInsert));
forgetIncompleteSplit(data->node,
PostingItemGetBlockNumber(pitem),
data->updateBlkno);
}
}
else
{
if (!data->isLeaf && data->updateBlkno != InvalidBlockNumber)
{
IndexTuple itup;
itup = (IndexTuple) (XLogRecGetData(record) + sizeof(ginxlogInsert));
forgetIncompleteSplit(data->node,
GinItemPointerGetBlockNumber(&itup->t_tid),
data->updateBlkno);
}
}
/* nothing else to do if page was backed up */
if (record->xl_info & XLR_BKP_BLOCK_1)
return;
buffer = XLogReadBuffer(data->node, data->blkno, false);
Assert(BufferIsValid(buffer));
if (!BufferIsValid(buffer))
return; /* page was deleted, nothing to do */
page = (Page) BufferGetPage(buffer);
if (data->isData)
if (!XLByteLE(lsn, PageGetLSN(page)))
{
Assert(data->isDelete == FALSE);
Assert(GinPageIsData(page));
if (!XLByteLE(lsn, PageGetLSN(page)))
if (data->isData)
{
Assert(GinPageIsData(page));
if (data->isLeaf)
{
OffsetNumber i;
@ -172,23 +201,12 @@ ginRedoInsert(XLogRecPtr lsn, XLogRecord *record)
GinDataPageAddItem(page, pitem, data->offset);
}
}
if (!data->isLeaf && data->updateBlkno != InvalidBlockNumber)
else
{
PostingItem *pitem = (PostingItem *) (XLogRecGetData(record) + sizeof(ginxlogInsert));
IndexTuple itup;
forgetIncompleteSplit(data->node, PostingItemGetBlockNumber(pitem), data->updateBlkno);
}
Assert(!GinPageIsData(page));
}
else
{
IndexTuple itup;
Assert(!GinPageIsData(page));
if (!XLByteLE(lsn, PageGetLSN(page)))
{
if (data->updateBlkno != InvalidBlockNumber)
{
/* update link to right page after split */
@ -212,20 +230,12 @@ ginRedoInsert(XLogRecPtr lsn, XLogRecord *record)
data->node.spcNode, data->node.dbNode, data->node.relNode);
}
if (!data->isLeaf && data->updateBlkno != InvalidBlockNumber)
{
itup = (IndexTuple) (XLogRecGetData(record) + sizeof(ginxlogInsert));
forgetIncompleteSplit(data->node, GinItemPointerGetBlockNumber(&itup->t_tid), data->updateBlkno);
}
}
if (!XLByteLE(lsn, PageGetLSN(page)))
{
PageSetLSN(page, lsn);
PageSetTLI(page, ThisTimeLineID);
MarkBufferDirty(buffer);
}
UnlockReleaseBuffer(buffer);
}
@ -244,7 +254,7 @@ ginRedoSplit(XLogRecPtr lsn, XLogRecord *record)
if (data->isData)
flags |= GIN_DATA;
lbuffer = XLogReadBuffer(data->node, data->lblkno, data->isRootSplit);
lbuffer = XLogReadBuffer(data->node, data->lblkno, true);
Assert(BufferIsValid(lbuffer));
lpage = (Page) BufferGetPage(lbuffer);
GinInitBuffer(lbuffer, flags);
@ -321,7 +331,7 @@ ginRedoSplit(XLogRecPtr lsn, XLogRecord *record)
if (data->isRootSplit)
{
Buffer rootBuf = XLogReadBuffer(data->node, data->rootBlkno, false);
Buffer rootBuf = XLogReadBuffer(data->node, data->rootBlkno, true);
Page rootPage = BufferGetPage(rootBuf);
GinInitBuffer(rootBuf, flags & ~GIN_LEAF);
@ -357,45 +367,49 @@ ginRedoVacuumPage(XLogRecPtr lsn, XLogRecord *record)
Buffer buffer;
Page page;
/* nothing else to do if page was backed up (and no info to do it with) */
/* nothing to do if page was backed up (and no info to do it with) */
if (record->xl_info & XLR_BKP_BLOCK_1)
return;
buffer = XLogReadBuffer(data->node, data->blkno, false);
Assert(BufferIsValid(buffer));
if (!BufferIsValid(buffer))
return;
page = (Page) BufferGetPage(buffer);
if (GinPageIsData(page))
{
memcpy(GinDataPageGetData(page), XLogRecGetData(record) + sizeof(ginxlogVacuumPage),
GinSizeOfItem(page) *data->nitem);
GinPageGetOpaque(page)->maxoff = data->nitem;
}
else
if (!XLByteLE(lsn, PageGetLSN(page)))
{
OffsetNumber i,
*tod;
IndexTuple itup = (IndexTuple) (XLogRecGetData(record) + sizeof(ginxlogVacuumPage));
if (GinPageIsData(page))
{
memcpy(GinDataPageGetData(page), XLogRecGetData(record) + sizeof(ginxlogVacuumPage),
GinSizeOfItem(page) *data->nitem);
GinPageGetOpaque(page)->maxoff = data->nitem;
}
else
{
OffsetNumber i,
*tod;
IndexTuple itup = (IndexTuple) (XLogRecGetData(record) + sizeof(ginxlogVacuumPage));
tod = (OffsetNumber *) palloc(sizeof(OffsetNumber) * PageGetMaxOffsetNumber(page));
for (i = FirstOffsetNumber; i <= PageGetMaxOffsetNumber(page); i++)
tod[i - 1] = i;
tod = (OffsetNumber *) palloc(sizeof(OffsetNumber) * PageGetMaxOffsetNumber(page));
for (i = FirstOffsetNumber; i <= PageGetMaxOffsetNumber(page); i++)
tod[i - 1] = i;
PageIndexMultiDelete(page, tod, PageGetMaxOffsetNumber(page));
PageIndexMultiDelete(page, tod, PageGetMaxOffsetNumber(page));
for (i = 0; i < data->nitem; i++)
{
if (PageAddItem(page, (Item) itup, IndexTupleSize(itup), InvalidOffsetNumber, false, false) == InvalidOffsetNumber)
elog(ERROR, "failed to add item to index page in %u/%u/%u",
data->node.spcNode, data->node.dbNode, data->node.relNode);
itup = (IndexTuple) (((char *) itup) + MAXALIGN(IndexTupleSize(itup)));
for (i = 0; i < data->nitem; i++)
{
if (PageAddItem(page, (Item) itup, IndexTupleSize(itup), InvalidOffsetNumber, false, false) == InvalidOffsetNumber)
elog(ERROR, "failed to add item to index page in %u/%u/%u",
data->node.spcNode, data->node.dbNode, data->node.relNode);
itup = (IndexTuple) (((char *) itup) + MAXALIGN(IndexTupleSize(itup)));
}
}
}
PageSetLSN(page, lsn);
PageSetTLI(page, ThisTimeLineID);
PageSetLSN(page, lsn);
PageSetTLI(page, ThisTimeLineID);
MarkBufferDirty(buffer);
}
MarkBufferDirty(buffer);
UnlockReleaseBuffer(buffer);
}
@ -409,38 +423,56 @@ ginRedoDeletePage(XLogRecPtr lsn, XLogRecord *record)
if (!(record->xl_info & XLR_BKP_BLOCK_1))
{
buffer = XLogReadBuffer(data->node, data->blkno, false);
page = BufferGetPage(buffer);
Assert(GinPageIsData(page));
GinPageGetOpaque(page)->flags = GIN_DELETED;
PageSetLSN(page, lsn);
PageSetTLI(page, ThisTimeLineID);
MarkBufferDirty(buffer);
UnlockReleaseBuffer(buffer);
if (BufferIsValid(buffer))
{
page = BufferGetPage(buffer);
if (!XLByteLE(lsn, PageGetLSN(page)))
{
Assert(GinPageIsData(page));
GinPageGetOpaque(page)->flags = GIN_DELETED;
PageSetLSN(page, lsn);
PageSetTLI(page, ThisTimeLineID);
MarkBufferDirty(buffer);
}
UnlockReleaseBuffer(buffer);
}
}
if (!(record->xl_info & XLR_BKP_BLOCK_2))
{
buffer = XLogReadBuffer(data->node, data->parentBlkno, false);
page = BufferGetPage(buffer);
Assert(GinPageIsData(page));
Assert(!GinPageIsLeaf(page));
PageDeletePostingItem(page, data->parentOffset);
PageSetLSN(page, lsn);
PageSetTLI(page, ThisTimeLineID);
MarkBufferDirty(buffer);
UnlockReleaseBuffer(buffer);
if (BufferIsValid(buffer))
{
page = BufferGetPage(buffer);
if (!XLByteLE(lsn, PageGetLSN(page)))
{
Assert(GinPageIsData(page));
Assert(!GinPageIsLeaf(page));
PageDeletePostingItem(page, data->parentOffset);
PageSetLSN(page, lsn);
PageSetTLI(page, ThisTimeLineID);
MarkBufferDirty(buffer);
}
UnlockReleaseBuffer(buffer);
}
}
if (!(record->xl_info & XLR_BKP_BLOCK_3) && data->leftBlkno != InvalidBlockNumber)
{
buffer = XLogReadBuffer(data->node, data->leftBlkno, false);
page = BufferGetPage(buffer);
Assert(GinPageIsData(page));
GinPageGetOpaque(page)->rightlink = data->rightLink;
PageSetLSN(page, lsn);
PageSetTLI(page, ThisTimeLineID);
MarkBufferDirty(buffer);
UnlockReleaseBuffer(buffer);
if (BufferIsValid(buffer))
{
page = BufferGetPage(buffer);
if (!XLByteLE(lsn, PageGetLSN(page)))
{
Assert(GinPageIsData(page));
GinPageGetOpaque(page)->rightlink = data->rightLink;
PageSetLSN(page, lsn);
PageSetTLI(page, ThisTimeLineID);
MarkBufferDirty(buffer);
}
UnlockReleaseBuffer(buffer);
}
}
}
@ -450,8 +482,11 @@ ginRedoUpdateMetapage(XLogRecPtr lsn, XLogRecord *record)
ginxlogUpdateMeta *data = (ginxlogUpdateMeta *) XLogRecGetData(record);
Buffer metabuffer;
Page metapage;
Buffer buffer;
metabuffer = XLogReadBuffer(data->node, GIN_METAPAGE_BLKNO, false);
if (!BufferIsValid(metabuffer))
elog(PANIC, "GIN metapage disappeared");
metapage = BufferGetPage(metabuffer);
if (!XLByteLE(lsn, PageGetLSN(metapage)))
@ -469,40 +504,43 @@ ginRedoUpdateMetapage(XLogRecPtr lsn, XLogRecord *record)
*/
if (!(record->xl_info & XLR_BKP_BLOCK_1))
{
Buffer buffer = XLogReadBuffer(data->node, data->metadata.tail, false);
Page page = BufferGetPage(buffer);
if (!XLByteLE(lsn, PageGetLSN(page)))
buffer = XLogReadBuffer(data->node, data->metadata.tail, false);
if (BufferIsValid(buffer))
{
OffsetNumber l,
off = (PageIsEmpty(page)) ? FirstOffsetNumber :
OffsetNumberNext(PageGetMaxOffsetNumber(page));
int i,
tupsize;
IndexTuple tuples = (IndexTuple) (XLogRecGetData(record) + sizeof(ginxlogUpdateMeta));
for (i = 0; i < data->ntuples; i++)
Page page = BufferGetPage(buffer);
if (!XLByteLE(lsn, PageGetLSN(page)))
{
tupsize = IndexTupleSize(tuples);
OffsetNumber l,
off = (PageIsEmpty(page)) ? FirstOffsetNumber :
OffsetNumberNext(PageGetMaxOffsetNumber(page));
int i,
tupsize;
IndexTuple tuples = (IndexTuple) (XLogRecGetData(record) + sizeof(ginxlogUpdateMeta));
l = PageAddItem(page, (Item) tuples, tupsize, off, false, false);
for (i = 0; i < data->ntuples; i++)
{
tupsize = IndexTupleSize(tuples);
if (l == InvalidOffsetNumber)
elog(ERROR, "failed to add item to index page");
l = PageAddItem(page, (Item) tuples, tupsize, off, false, false);
tuples = (IndexTuple) (((char *) tuples) + tupsize);
}
if (l == InvalidOffsetNumber)
elog(ERROR, "failed to add item to index page");
/*
* Increase counter of heap tuples
*/
GinPageGetOpaque(page)->maxoff++;
tuples = (IndexTuple) (((char *) tuples) + tupsize);
}
PageSetLSN(page, lsn);
PageSetTLI(page, ThisTimeLineID);
MarkBufferDirty(buffer);
/*
* Increase counter of heap tuples
*/
GinPageGetOpaque(page)->maxoff++;
PageSetLSN(page, lsn);
PageSetTLI(page, ThisTimeLineID);
MarkBufferDirty(buffer);
}
UnlockReleaseBuffer(buffer);
}
UnlockReleaseBuffer(buffer);
}
}
else if (data->prevTail != InvalidBlockNumber)
@ -510,19 +548,21 @@ ginRedoUpdateMetapage(XLogRecPtr lsn, XLogRecord *record)
/*
* New tail
*/
Buffer buffer = XLogReadBuffer(data->node, data->prevTail, false);
Page page = BufferGetPage(buffer);
if (!XLByteLE(lsn, PageGetLSN(page)))
buffer = XLogReadBuffer(data->node, data->prevTail, false);
if (BufferIsValid(buffer))
{
GinPageGetOpaque(page)->rightlink = data->newRightlink;
Page page = BufferGetPage(buffer);
PageSetLSN(page, lsn);
PageSetTLI(page, ThisTimeLineID);
MarkBufferDirty(buffer);
if (!XLByteLE(lsn, PageGetLSN(page)))
{
GinPageGetOpaque(page)->rightlink = data->newRightlink;
PageSetLSN(page, lsn);
PageSetTLI(page, ThisTimeLineID);
MarkBufferDirty(buffer);
}
UnlockReleaseBuffer(buffer);
}
UnlockReleaseBuffer(buffer);
}
UnlockReleaseBuffer(metabuffer);
@ -544,6 +584,7 @@ ginRedoInsertListPage(XLogRecPtr lsn, XLogRecord *record)
return;
buffer = XLogReadBuffer(data->node, data->blkno, true);
Assert(BufferIsValid(buffer));
page = BufferGetPage(buffer);
GinInitBuffer(buffer, GIN_LIST);
@ -587,6 +628,8 @@ ginRedoDeleteListPages(XLogRecPtr lsn, XLogRecord *record)
int i;
metabuffer = XLogReadBuffer(data->node, GIN_METAPAGE_BLKNO, false);
if (!BufferIsValid(metabuffer))
elog(PANIC, "GIN metapage disappeared");
metapage = BufferGetPage(metabuffer);
if (!XLByteLE(lsn, PageGetLSN(metapage)))
@ -600,18 +643,22 @@ ginRedoDeleteListPages(XLogRecPtr lsn, XLogRecord *record)
for (i = 0; i < data->ndeleted; i++)
{
Buffer buffer = XLogReadBuffer(data->node, data->toDelete[i], false);
Page page = BufferGetPage(buffer);
if (!XLByteLE(lsn, PageGetLSN(page)))
if (BufferIsValid(buffer))
{
GinPageGetOpaque(page)->flags = GIN_DELETED;
Page page = BufferGetPage(buffer);
PageSetLSN(page, lsn);
PageSetTLI(page, ThisTimeLineID);
MarkBufferDirty(buffer);
}
if (!XLByteLE(lsn, PageGetLSN(page)))
{
GinPageGetOpaque(page)->flags = GIN_DELETED;
UnlockReleaseBuffer(buffer);
PageSetLSN(page, lsn);
PageSetTLI(page, ThisTimeLineID);
MarkBufferDirty(buffer);
}
UnlockReleaseBuffer(buffer);
}
}
UnlockReleaseBuffer(metabuffer);
}
@ -755,6 +802,13 @@ ginContinueSplit(ginIncompleteSplit *split)
*/
buffer = XLogReadBuffer(split->node, split->leftBlkno, false);
/*
* Failure should be impossible here, because we wrote the page earlier.
*/
if (!BufferIsValid(buffer))
elog(PANIC, "ginContinueSplit: left block %u not found",
split->leftBlkno);
reln = CreateFakeRelcacheEntry(split->node);
if (split->rootBlkno == GIN_ROOT_BLKNO)

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