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Keep CommitTs module in sync in standby and master

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We allow this module to be turned off on restarts, so a restart time
check is enough to activate or deactivate the module; however, if there
is a standby replaying WAL emitted from a master which is restarted, but
the standby isn't, the state in the standby becomes inconsistent and can
easily be crashed.

Fix by activating and deactivating the module during WAL replay on
parameter change as well as on system start.

Problem reported by Fujii Masao in
http://www.postgresql.org/message-id/CAHGQGwFhJ3CnHo1CELEfay18yg_RA-XZT-7D8NuWUoYSZ90r4Q@mail.gmail.com

Author: Petr Jelínek
This commit is contained in:
Alvaro Herrera
2015-03-09 17:44:00 -03:00
parent e3f1c24b99
commit 4f3924d9cd
4 changed files with 99 additions and 24 deletions
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4
src/include/access/commit_ts.h
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@ -39,11 +39,13 @@ extern Size CommitTsShmemSize(void);
extern void CommitTsShmemInit(void);
extern void BootStrapCommitTs(void);
extern void StartupCommitTs(void);
extern void ActivateCommitTs(void);
extern void DeactivateCommitTs(bool do_wal);
extern void CompleteCommitTsInitialization(void);
extern void ShutdownCommitTs(void);
extern void CheckPointCommitTs(void);
extern void ExtendCommitTs(TransactionId newestXact);
extern void TruncateCommitTs(TransactionId oldestXact);
extern void TruncateCommitTs(TransactionId oldestXact, bool do_wal);
extern void SetCommitTsLimit(TransactionId oldestXact,
TransactionId newestXact);
extern void AdvanceOldestCommitTs(TransactionId oldestXact);