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Include the backend ID in the relpath of temporary relations.

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This allows us to reliably remove all leftover temporary relation
files on cluster startup without reference to system catalogs or WAL;
therefore, we no longer include temporary relations in XLOG_XACT_COMMIT
and XLOG_XACT_ABORT WAL records.

Since these changes require including a backend ID in each
SharedInvalSmgrMsg, the size of the SharedInvalidationMessage.id
field has been reduced from two bytes to one, and the maximum number
of connections has been reduced from INT_MAX / 4 to 2^23-1.  It would
be possible to remove these restrictions by increasing the size of
SharedInvalidationMessage by 4 bytes, but right now that doesn't seem
like a good trade-off.

Review by Jaime Casanova and Tom Lane.
This commit is contained in:
Robert Haas
2010-08-13 20:10:54 +00:00
parent 3f9479ef3f
commit debcec7dc3
37 changed files with 669 additions and 343 deletions
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18
src/backend/storage/buffer/localbuf.c
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@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/buffer/localbuf.c,v 1.89 2010/01/02 16:57:51 momjian Exp $
* $PostgreSQL: pgsql/src/backend/storage/buffer/localbuf.c,v 1.90 2010/08/13 20:10:52 rhaas Exp $
*
*-------------------------------------------------------------------------
*/
@ -68,7 +68,7 @@ LocalPrefetchBuffer(SMgrRelation smgr, ForkNumber forkNum,
BufferTag newTag; /* identity of requested block */
LocalBufferLookupEnt *hresult;
INIT_BUFFERTAG(newTag, smgr->smgr_rnode, forkNum, blockNum);
INIT_BUFFERTAG(newTag, smgr->smgr_rnode.node, forkNum, blockNum);
/* Initialize local buffers if first request in this session */
if (LocalBufHash == NULL)
@ -110,7 +110,7 @@ LocalBufferAlloc(SMgrRelation smgr, ForkNumber forkNum, BlockNumber blockNum,
int trycounter;
bool found;
INIT_BUFFERTAG(newTag, smgr->smgr_rnode, forkNum, blockNum);
INIT_BUFFERTAG(newTag, smgr->smgr_rnode.node, forkNum, blockNum);
/* Initialize local buffers if first request in this session */
if (LocalBufHash == NULL)
@ -127,7 +127,7 @@ LocalBufferAlloc(SMgrRelation smgr, ForkNumber forkNum, BlockNumber blockNum,
Assert(BUFFERTAGS_EQUAL(bufHdr->tag, newTag));
#ifdef LBDEBUG
fprintf(stderr, "LB ALLOC (%u,%d,%d) %d\n",
smgr->smgr_rnode.relNode, forkNum, blockNum, -b - 1);
smgr->smgr_rnode.node.relNode, forkNum, blockNum, -b - 1);
#endif
/* this part is equivalent to PinBuffer for a shared buffer */
if (LocalRefCount[b] == 0)
@ -150,7 +150,8 @@ LocalBufferAlloc(SMgrRelation smgr, ForkNumber forkNum, BlockNumber blockNum,
#ifdef LBDEBUG
fprintf(stderr, "LB ALLOC (%u,%d,%d) %d\n",
smgr->smgr_rnode.relNode, forkNum, blockNum, -nextFreeLocalBuf - 1);
smgr->smgr_rnode.node.relNode, forkNum, blockNum,
-nextFreeLocalBuf - 1);
#endif
/*
@ -198,14 +199,14 @@ LocalBufferAlloc(SMgrRelation smgr, ForkNumber forkNum, BlockNumber blockNum,
SMgrRelation oreln;
/* Find smgr relation for buffer */
oreln = smgropen(bufHdr->tag.rnode);
oreln = smgropen(bufHdr->tag.rnode, MyBackendId);
/* And write... */
smgrwrite(oreln,
bufHdr->tag.forkNum,
bufHdr->tag.blockNum,
(char *) LocalBufHdrGetBlock(bufHdr),
true);
false);
/* Mark not-dirty now in case we error out below */
bufHdr->flags &= ~BM_DIRTY;
@ -309,7 +310,8 @@ DropRelFileNodeLocalBuffers(RelFileNode rnode, ForkNumber forkNum,
if (LocalRefCount[i] != 0)
elog(ERROR, "block %u of %s is still referenced (local %u)",
bufHdr->tag.blockNum,
relpath(bufHdr->tag.rnode, bufHdr->tag.forkNum),
relpathbackend(bufHdr->tag.rnode, MyBackendId,
bufHdr->tag.forkNum),
LocalRefCount[i]);
/* Remove entry from hashtable */
hresult = (LocalBufferLookupEnt *)