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Make the world safe for full_page_writes. Allow XLOG records that try to
update no-longer-existing pages to fall through as no-ops, but make a note of each page number referenced by such records. If we don't see a later XLOG entry dropping the table or truncating away the page, complain at the end of XLOG replay. Since this fixes the known failure mode for full_page_writes = off, revert my previous band-aid patch that disabled that GUC variable.
This commit is contained in:
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defe93463c
@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.234 2006/04/05 03:34:05 tgl Exp $
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* $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.235 2006/04/14 20:27:24 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -980,7 +980,8 @@ XLogCheckBuffer(XLogRecData *rdata,
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*/
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*lsn = page->pd_lsn;
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if (XLByteLE(page->pd_lsn, RedoRecPtr))
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if (fullPageWrites &&
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XLByteLE(page->pd_lsn, RedoRecPtr))
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{
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/*
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* The page needs to be backed up, so set up *bkpb
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@ -4786,6 +4787,12 @@ StartupXLOG(void)
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RmgrTable[rmid].rm_cleanup();
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}
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/*
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* Check to see if the XLOG sequence contained any unresolved
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* references to uninitialized pages.
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*/
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XLogCheckInvalidPages();
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/*
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* Reset pgstat data, because it may be invalid after recovery.
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*/
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@ -11,7 +11,7 @@
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* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/backend/access/transam/xlogutils.c,v 1.43 2006/03/31 23:32:06 tgl Exp $
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* $PostgreSQL: pgsql/src/backend/access/transam/xlogutils.c,v 1.44 2006/04/14 20:27:24 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -24,6 +24,176 @@
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#include "utils/hsearch.h"
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/*
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* During XLOG replay, we may see XLOG records for incremental updates of
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* pages that no longer exist, because their relation was later dropped or
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* truncated. (Note: this is only possible when full_page_writes = OFF,
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* since when it's ON, the first reference we see to a page should always
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* be a full-page rewrite not an incremental update.) Rather than simply
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* ignoring such records, we make a note of the referenced page, and then
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* complain if we don't actually see a drop or truncate covering the page
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* later in replay.
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*/
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typedef struct xl_invalid_page_key
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{
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RelFileNode node; /* the relation */
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BlockNumber blkno; /* the page */
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} xl_invalid_page_key;
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typedef struct xl_invalid_page
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{
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xl_invalid_page_key key; /* hash key ... must be first */
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bool present; /* page existed but contained zeroes */
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} xl_invalid_page;
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static HTAB *invalid_page_tab = NULL;
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/* Log a reference to an invalid page */
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static void
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log_invalid_page(RelFileNode node, BlockNumber blkno, bool present)
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{
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xl_invalid_page_key key;
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xl_invalid_page *hentry;
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bool found;
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/*
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* Log references to invalid pages at DEBUG1 level. This allows some
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* tracing of the cause (note the elog context mechanism will tell us
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* something about the XLOG record that generated the reference).
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*/
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if (present)
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elog(DEBUG1, "page %u of relation %u/%u/%u is uninitialized",
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blkno, node.spcNode, node.dbNode, node.relNode);
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else
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elog(DEBUG1, "page %u of relation %u/%u/%u does not exist",
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blkno, node.spcNode, node.dbNode, node.relNode);
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if (invalid_page_tab == NULL)
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{
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/* create hash table when first needed */
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HASHCTL ctl;
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memset(&ctl, 0, sizeof(ctl));
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ctl.keysize = sizeof(xl_invalid_page_key);
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ctl.entrysize = sizeof(xl_invalid_page);
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ctl.hash = tag_hash;
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invalid_page_tab = hash_create("XLOG invalid-page table",
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100,
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&ctl,
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HASH_ELEM | HASH_FUNCTION);
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}
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/* we currently assume xl_invalid_page_key contains no padding */
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key.node = node;
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key.blkno = blkno;
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hentry = (xl_invalid_page *)
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hash_search(invalid_page_tab, (void *) &key, HASH_ENTER, &found);
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if (!found)
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{
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/* hash_search already filled in the key */
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hentry->present = present;
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}
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else
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{
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/* repeat reference ... leave "present" as it was */
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}
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}
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/* Forget any invalid pages >= minblkno, because they've been dropped */
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static void
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forget_invalid_pages(RelFileNode node, BlockNumber minblkno)
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{
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HASH_SEQ_STATUS status;
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xl_invalid_page *hentry;
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if (invalid_page_tab == NULL)
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return; /* nothing to do */
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hash_seq_init(&status, invalid_page_tab);
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while ((hentry = (xl_invalid_page *) hash_seq_search(&status)) != NULL)
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{
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if (RelFileNodeEquals(hentry->key.node, node) &&
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hentry->key.blkno >= minblkno)
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{
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elog(DEBUG2, "page %u of relation %u/%u/%u has been dropped",
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hentry->key.blkno, hentry->key.node.spcNode,
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hentry->key.node.dbNode, hentry->key.node.relNode);
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if (hash_search(invalid_page_tab,
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(void *) &hentry->key,
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HASH_REMOVE, NULL) == NULL)
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elog(ERROR, "hash table corrupted");
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}
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}
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}
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/* Forget any invalid pages in a whole database */
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static void
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forget_invalid_pages_db(Oid dbid)
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{
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HASH_SEQ_STATUS status;
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xl_invalid_page *hentry;
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if (invalid_page_tab == NULL)
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return; /* nothing to do */
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hash_seq_init(&status, invalid_page_tab);
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while ((hentry = (xl_invalid_page *) hash_seq_search(&status)) != NULL)
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{
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if (hentry->key.node.dbNode == dbid)
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{
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elog(DEBUG2, "page %u of relation %u/%u/%u has been dropped",
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hentry->key.blkno, hentry->key.node.spcNode,
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hentry->key.node.dbNode, hentry->key.node.relNode);
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if (hash_search(invalid_page_tab,
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(void *) &hentry->key,
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HASH_REMOVE, NULL) == NULL)
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elog(ERROR, "hash table corrupted");
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}
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}
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}
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/* Complain about any remaining invalid-page entries */
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void
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XLogCheckInvalidPages(void)
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{
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HASH_SEQ_STATUS status;
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xl_invalid_page *hentry;
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bool foundone = false;
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if (invalid_page_tab == NULL)
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return; /* nothing to do */
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hash_seq_init(&status, invalid_page_tab);
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/*
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* Our strategy is to emit WARNING messages for all remaining entries
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* and only PANIC after we've dumped all the available info.
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*/
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while ((hentry = (xl_invalid_page *) hash_seq_search(&status)) != NULL)
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{
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if (hentry->present)
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elog(WARNING, "page %u of relation %u/%u/%u was uninitialized",
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hentry->key.blkno, hentry->key.node.spcNode,
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hentry->key.node.dbNode, hentry->key.node.relNode);
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else
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elog(WARNING, "page %u of relation %u/%u/%u did not exist",
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hentry->key.blkno, hentry->key.node.spcNode,
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hentry->key.node.dbNode, hentry->key.node.relNode);
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foundone = true;
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}
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if (foundone)
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elog(PANIC, "WAL contains references to invalid pages");
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}
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/*
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* XLogReadBuffer
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* Read a page during XLOG replay
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@ -40,12 +210,11 @@
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* the page being "new" (all zeroes).
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*
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* If "init" is false then the caller needs the page to be valid already.
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* If the page doesn't exist or contains zeroes, we report failure.
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*
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* If the return value is InvalidBuffer (only possible when init = false),
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* the caller should silently skip the update on this page. This currently
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* never happens, but we retain it as part of the API spec for possible future
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* use.
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* If the page doesn't exist or contains zeroes, we return InvalidBuffer.
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* In this case the caller should silently skip the update on this page.
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* (In this situation, we expect that the page was later dropped or truncated.
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* If we don't see evidence of that later in the WAL sequence, we'll complain
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* at the end of WAL replay.)
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*/
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Buffer
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XLogReadBuffer(Relation reln, BlockNumber blkno, bool init)
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@ -64,9 +233,10 @@ XLogReadBuffer(Relation reln, BlockNumber blkno, bool init)
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{
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/* hm, page doesn't exist in file */
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if (!init)
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elog(PANIC, "block %u of relation %u/%u/%u does not exist",
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blkno, reln->rd_node.spcNode,
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reln->rd_node.dbNode, reln->rd_node.relNode);
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{
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log_invalid_page(reln->rd_node, blkno, false);
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return InvalidBuffer;
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}
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/* OK to extend the file */
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/* we do this in recovery only - no rel-extension lock needed */
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Assert(InRecovery);
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@ -89,9 +259,11 @@ XLogReadBuffer(Relation reln, BlockNumber blkno, bool init)
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Page page = (Page) BufferGetPage(buffer);
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if (PageIsNew((PageHeader) page))
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elog(PANIC, "block %u of relation %u/%u/%u is uninitialized",
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blkno, reln->rd_node.spcNode,
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reln->rd_node.dbNode, reln->rd_node.relNode);
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{
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UnlockReleaseBuffer(buffer);
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log_invalid_page(reln->rd_node, blkno, true);
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return InvalidBuffer;
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}
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}
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return buffer;
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@ -195,6 +367,7 @@ void
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XLogInitRelationCache(void)
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{
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_xl_init_rel_cache();
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invalid_page_tab = NULL;
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}
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void
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@ -300,24 +473,28 @@ XLogOpenRelation(RelFileNode rnode)
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*
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* Currently, we don't bother to physically remove the relation from the
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* cache, we just let it age out normally.
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*
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* This also takes care of removing any open "invalid-page" records for
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* the relation.
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*/
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void
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XLogDropRelation(RelFileNode rnode)
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{
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XLogRelDesc *rdesc;
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XLogRelCacheEntry *hentry;
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hentry = (XLogRelCacheEntry *)
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hash_search(_xlrelcache, (void *) &rnode, HASH_FIND, NULL);
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if (!hentry)
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return; /* not in cache so no work */
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rdesc = hentry->rdesc;
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if (hentry)
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{
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XLogRelDesc *rdesc = hentry->rdesc;
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RelationCloseSmgr(&(rdesc->reldata));
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}
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forget_invalid_pages(rnode, 0);
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}
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/*
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* Drop a whole database during XLOG replay
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*
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@ -338,4 +515,18 @@ XLogDropDatabase(Oid dbid)
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if (hentry->rnode.dbNode == dbid)
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RelationCloseSmgr(&(rdesc->reldata));
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}
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forget_invalid_pages_db(dbid);
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}
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/*
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* Truncate a relation during XLOG replay
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*
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* We don't need to do anything to the fake relcache, but we do need to
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* clean up any open "invalid-page" records for the dropped pages.
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*/
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void
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XLogTruncateRelation(RelFileNode rnode, BlockNumber nblocks)
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{
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forget_invalid_pages(rnode, nblocks);
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}
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@ -11,13 +11,14 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/storage/smgr/smgr.c,v 1.98 2006/03/30 22:11:55 tgl Exp $
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* $PostgreSQL: pgsql/src/backend/storage/smgr/smgr.c,v 1.99 2006/04/14 20:27:24 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "access/xact.h"
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#include "access/xlogutils.h"
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#include "commands/tablespace.h"
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#include "pgstat.h"
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#include "storage/bufmgr.h"
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@ -942,6 +943,9 @@ smgr_redo(XLogRecPtr lsn, XLogRecord *record)
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reln->smgr_rnode.dbNode,
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reln->smgr_rnode.relNode,
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xlrec->blkno)));
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/* Also tell xlogutils.c about it */
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XLogTruncateRelation(xlrec->rnode, xlrec->blkno);
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}
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else
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elog(PANIC, "smgr_redo: unknown op code %u", info);
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@ -6,7 +6,7 @@
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* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/access/xlogutils.h,v 1.20 2006/03/29 21:17:39 tgl Exp $
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* $PostgreSQL: pgsql/src/include/access/xlogutils.h,v 1.21 2006/04/14 20:27:24 tgl Exp $
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*/
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#ifndef XLOG_UTILS_H
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#define XLOG_UTILS_H
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@ -16,11 +16,13 @@
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extern void XLogInitRelationCache(void);
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extern void XLogCheckInvalidPages(void);
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extern void XLogCloseRelationCache(void);
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extern Relation XLogOpenRelation(RelFileNode rnode);
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extern void XLogDropRelation(RelFileNode rnode);
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extern void XLogDropDatabase(Oid dbid);
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extern void XLogTruncateRelation(RelFileNode rnode, BlockNumber nblocks);
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extern Buffer XLogReadBuffer(Relation reln, BlockNumber blkno, bool init);
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