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631118fe1e
Replace it with an approach similar to what GiST uses: when a page is split, the left sibling is marked with a flag indicating that the parent hasn't been updated yet. When the parent is updated, the flag is cleared. If an insertion steps on a page with the flag set, it will finish split before proceeding with the insertion. The post-recovery cleanup mechanism was never totally reliable, as insertion to the parent could fail e.g because of running out of memory or disk space, leaving the tree in an inconsistent state. This also divides the responsibility of WAL-logging more clearly between the generic ginbtree.c code, and the parts specific to entry and posting trees. There is now a common WAL record format for insertions and deletions, which is written by ginbtree.c, followed by tree-specific payload, which is returned by the placetopage- and split- callbacks.
45 lines
2.4 KiB
C
45 lines
2.4 KiB
C
/*---------------------------------------------------------------------------
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* rmgrlist.h
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*
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* The resource manager list is kept in its own source file for possible
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* use by automatic tools. The exact representation of a rmgr is determined
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* by the PG_RMGR macro, which is not defined in this file; it can be
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* defined by the caller for special purposes.
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*
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* Portions Copyright (c) 1996-2013, 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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* src/include/access/rmgrlist.h
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*---------------------------------------------------------------------------
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*/
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/* there is deliberately not an #ifndef RMGRLIST_H here */
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/*
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* List of resource manager entries. Note that order of entries defines the
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* numerical values of each rmgr's ID, which is stored in WAL records. New
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* entries should be added at the end, to avoid changing IDs of existing
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* entries.
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*
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* Changes to this list possibly need a XLOG_PAGE_MAGIC bump.
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*/
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/* symbol name, textual name, redo, desc, startup, cleanup, restartpoint */
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PG_RMGR(RM_XLOG_ID, "XLOG", xlog_redo, xlog_desc, NULL, NULL, NULL)
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PG_RMGR(RM_XACT_ID, "Transaction", xact_redo, xact_desc, NULL, NULL, NULL)
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PG_RMGR(RM_SMGR_ID, "Storage", smgr_redo, smgr_desc, NULL, NULL, NULL)
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PG_RMGR(RM_CLOG_ID, "CLOG", clog_redo, clog_desc, NULL, NULL, NULL)
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PG_RMGR(RM_DBASE_ID, "Database", dbase_redo, dbase_desc, NULL, NULL, NULL)
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PG_RMGR(RM_TBLSPC_ID, "Tablespace", tblspc_redo, tblspc_desc, NULL, NULL, NULL)
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PG_RMGR(RM_MULTIXACT_ID, "MultiXact", multixact_redo, multixact_desc, NULL, NULL, NULL)
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PG_RMGR(RM_RELMAP_ID, "RelMap", relmap_redo, relmap_desc, NULL, NULL, NULL)
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PG_RMGR(RM_STANDBY_ID, "Standby", standby_redo, standby_desc, NULL, NULL, NULL)
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PG_RMGR(RM_HEAP2_ID, "Heap2", heap2_redo, heap2_desc, NULL, NULL, NULL)
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PG_RMGR(RM_HEAP_ID, "Heap", heap_redo, heap_desc, NULL, NULL, NULL)
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PG_RMGR(RM_BTREE_ID, "Btree", btree_redo, btree_desc, btree_xlog_startup, btree_xlog_cleanup, btree_safe_restartpoint)
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PG_RMGR(RM_HASH_ID, "Hash", hash_redo, hash_desc, NULL, NULL, NULL)
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PG_RMGR(RM_GIN_ID, "Gin", gin_redo, gin_desc, gin_xlog_startup, gin_xlog_cleanup, NULL)
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PG_RMGR(RM_GIST_ID, "Gist", gist_redo, gist_desc, gist_xlog_startup, gist_xlog_cleanup, NULL)
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PG_RMGR(RM_SEQ_ID, "Sequence", seq_redo, seq_desc, NULL, NULL, NULL)
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PG_RMGR(RM_SPGIST_ID, "SPGist", spg_redo, spg_desc, spg_xlog_startup, spg_xlog_cleanup, NULL)
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