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f12e814b88
Module initialization was still not completely correct after commit 6b61955135e9, per crash report from Takashi Ohnishi. To fix, instead of trying to monkey around with the value of the GUC setting directly, add a separate boolean flag that enables the feature on a standby, but only for the startup (recovery) process, when it sees that its master server has the feature enabled. Discussion: http://www.postgresql.org/message-id/ca44c6c7f9314868bdc521aea4f77cbf@MP-MSGSS-MBX004.msg.nttdata.co.jp Also change the deactivation routine to delete all segment files rather than leaving the last one around. (This doesn't need separate WAL-logging, because on recovery we execute the same deactivation routine anyway.) In passing, clean up the code structure somewhat, particularly so that xlog.c doesn't know so much about when to activate/deactivate the feature. Thanks to Fujii Masao for testing and Petr Jelínek for off-list discussion. Back-patch to 9.5, where commit_ts was introduced.
70 lines
2.1 KiB
C
70 lines
2.1 KiB
C
/*
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* commit_ts.h
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*
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* PostgreSQL commit timestamp manager
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*
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* Portions Copyright (c) 1996-2015, 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/commit_ts.h
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*/
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#ifndef COMMIT_TS_H
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#define COMMIT_TS_H
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#include "access/xlog.h"
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#include "datatype/timestamp.h"
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#include "replication/origin.h"
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#include "utils/guc.h"
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extern PGDLLIMPORT bool track_commit_timestamp;
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extern bool check_track_commit_timestamp(bool *newval, void **extra,
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GucSource source);
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extern void TransactionTreeSetCommitTsData(TransactionId xid, int nsubxids,
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TransactionId *subxids, TimestampTz timestamp,
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RepOriginId nodeid, bool write_xlog);
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extern bool TransactionIdGetCommitTsData(TransactionId xid,
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TimestampTz *ts, RepOriginId *nodeid);
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extern TransactionId GetLatestCommitTsData(TimestampTz *ts,
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RepOriginId *nodeid);
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extern Size CommitTsShmemBuffers(void);
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extern Size CommitTsShmemSize(void);
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extern void CommitTsShmemInit(void);
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extern void BootStrapCommitTs(void);
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extern void StartupCommitTs(bool force_enable);
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extern void CommitTsParameterChange(bool xlrecvalue, bool pgcontrolvalue);
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extern void CompleteCommitTsInitialization(void);
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extern void ShutdownCommitTs(void);
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extern void CheckPointCommitTs(void);
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extern void ExtendCommitTs(TransactionId newestXact);
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extern void TruncateCommitTs(TransactionId oldestXact, bool do_wal);
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extern void SetCommitTsLimit(TransactionId oldestXact,
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TransactionId newestXact);
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extern void AdvanceOldestCommitTs(TransactionId oldestXact);
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/* XLOG stuff */
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#define COMMIT_TS_ZEROPAGE 0x00
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#define COMMIT_TS_TRUNCATE 0x10
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#define COMMIT_TS_SETTS 0x20
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typedef struct xl_commit_ts_set
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{
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TimestampTz timestamp;
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RepOriginId nodeid;
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TransactionId mainxid;
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/* subxact Xids follow */
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} xl_commit_ts_set;
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#define SizeOfCommitTsSet (offsetof(xl_commit_ts_set, mainxid) + \
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sizeof(TransactionId))
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extern void commit_ts_redo(XLogReaderState *record);
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extern void commit_ts_desc(StringInfo buf, XLogReaderState *record);
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extern const char *commit_ts_identify(uint8 info);
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#endif /* COMMIT_TS_H */
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