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Tweak md.c logic to cope with the situation where WAL replay tries to

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write into a high-numbered segment of a relation that was later deleted.
We need to temporarily recreate missing segment files, instead of
failing.
This commit is contained in:
Tom Lane 2004-08-30 03:52:43 +00:00
parent 09c6ac9513
commit 303e46ea93
1 changed files with 11 additions and 2 deletions
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13
src/backend/storage/smgr/md.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/smgr/md.c,v 1.111 2004/08/30 02:54:39 momjian Exp $
* $PostgreSQL: pgsql/src/backend/storage/smgr/md.c,v 1.112 2004/08/30 03:52:43 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -937,10 +937,19 @@ _mdfd_getseg(SMgrRelation reln, BlockNumber blkno, bool allowNotFound)
* "target" block. We should never need to create more than
* one new segment per call, so this restriction seems
* reasonable.
*
* BUT: when doing WAL recovery, disable this logic and create
* segments unconditionally. In this case it seems better
* to assume the given blkno is good (it presumably came from
* a CRC-checked WAL record); furthermore this lets us cope
* in the case where we are replaying WAL data that has a write
* into a high-numbered segment of a relation that was later
* deleted. We want to go ahead and create the segments so
* we can finish out the replay.
*/
v->mdfd_chain = _mdfd_openseg(reln,
nextsegno,
(segstogo == 1) ? O_CREAT : 0);
(segstogo == 1 || InRecovery) ? O_CREAT : 0);
if (v->mdfd_chain == NULL)
{
if (allowNotFound && errno == ENOENT)