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Remove dead code and add comments.

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'cbuffer' variable was left over from an earlier version of the patch to
rewrite the incomplete split handling.
This commit is contained in:
Heikki Linnakangas 2014-03-24 11:02:23 +02:00
parent 3ed249b741
commit 2f3afc0979
1 changed files with 11 additions and 5 deletions
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16
src/backend/access/nbtree/nbtxlog.c
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@ -130,7 +130,6 @@ btree_xlog_insert(bool isleaf, bool ismeta,
{
xl_btree_insert *xlrec = (xl_btree_insert *) XLogRecGetData(record);
Buffer buffer;
Buffer cbuffer = InvalidBuffer;
Page page;
char *datapos;
int datalen;
@ -158,6 +157,15 @@ btree_xlog_insert(bool isleaf, bool ismeta,
datalen -= sizeof(xl_btree_metadata);
}
/*
* Insertion to an internal page finishes an incomplete split at the
* child level. Clear the incomplete-split flag in the child. Note:
* during normal operation, the child and parent pages are locked at the
* same time, so that clearing the flag and inserting the downlink appear
* atomic to other backends. We don't bother with that during replay,
* because readers don't care about the incomplete-split flag and there
* cannot be updates happening.
*/
if (!isleaf)
{
if (record->xl_info & XLR_BKP_BLOCK(0))
@ -194,9 +202,6 @@ btree_xlog_insert(bool isleaf, bool ismeta,
}
}
if (BufferIsValid(cbuffer))
UnlockReleaseBuffer(cbuffer);
/*
* Note: in normal operation, we'd update the metapage while still holding
* lock on the page we inserted into. But during replay it's not
@ -273,7 +278,8 @@ btree_xlog_split(bool onleft, bool isroot,
/*
* Clear the incomplete split flag on the left sibling of the child page
* this is a downlink for.
* this is a downlink for. (Like in btree_xlog_insert, this can be done
* before locking the other pages)
*/
if (!isleaf)
{