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282fdfcdc8
The variables newestCommitTs and oldestCommitTs sound as if they are timestamps, but in fact they are the transaction Ids that correspond to the newest and oldest timestamps rather than the actual timestamps. Rename these variables to reflect that they are actually xids: to wit newestCommitTsXid and oldestCommitTsXid respectively. Also modify related code in a similar fashion, particularly the user facing output emitted by pg_controldata and pg_resetxlog. Complaint and patch by me, review by Tom Lane and Alvaro Herrera. Backpatch to 9.5 where these variables were first introduced.
69 lines
2.1 KiB
C
69 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(void);
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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);
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extern void SetCommitTsLimit(TransactionId oldestXact,
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TransactionId newestXact);
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extern void AdvanceOldestCommitTsXid(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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