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Add GUC to enable WAL-logging of hint bits, even with checksums disabled.

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WAL records of hint bit updates is useful to tools that want to examine
which pages have been modified. In particular, this is required to make
the pg_rewind tool safe (without checksums).

This can also be used to test how much extra WAL-logging would occur if
you enabled checksums, without actually enabling them (which you can't
currently do without re-initdb'ing).

Sawada Masahiko, docs by Samrat Revagade. Reviewed by Dilip Kumar, with
further changes by me.
This commit is contained in:
Heikki Linnakangas
2013-12-13 16:26:14 +02:00
parent 56afe8509e
commit 50e547096c
13 changed files with 70 additions and 9 deletions
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6
src/backend/access/transam/xlog.c
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@ -79,6 +79,7 @@ bool XLogArchiveMode = false;
char *XLogArchiveCommand = NULL;
bool EnableHotStandby = false;
bool fullPageWrites = true;
bool walLogHintbits = false;
bool log_checkpoints = false;
int sync_method = DEFAULT_SYNC_METHOD;
int wal_level = WAL_LEVEL_MINIMAL;
@ -5270,6 +5271,7 @@ BootStrapXLOG(void)
ControlFile->max_prepared_xacts = max_prepared_xacts;
ControlFile->max_locks_per_xact = max_locks_per_xact;
ControlFile->wal_level = wal_level;
ControlFile->wal_log_hintbits = walLogHintbits;
ControlFile->data_checksum_version = bootstrap_data_checksum_version;
/* some additional ControlFile fields are set in WriteControlFile() */
@ -9058,6 +9060,7 @@ static void
XLogReportParameters(void)
{
if (wal_level != ControlFile->wal_level ||
walLogHintbits != ControlFile->wal_log_hintbits ||
MaxConnections != ControlFile->MaxConnections ||
max_worker_processes != ControlFile->max_worker_processes ||
max_prepared_xacts != ControlFile->max_prepared_xacts ||
@ -9080,6 +9083,7 @@ XLogReportParameters(void)
xlrec.max_prepared_xacts = max_prepared_xacts;
xlrec.max_locks_per_xact = max_locks_per_xact;
xlrec.wal_level = wal_level;
xlrec.wal_log_hintbits = walLogHintbits;
rdata.buffer = InvalidBuffer;
rdata.data = (char *) &xlrec;
@ -9094,6 +9098,7 @@ XLogReportParameters(void)
ControlFile->max_prepared_xacts = max_prepared_xacts;
ControlFile->max_locks_per_xact = max_locks_per_xact;
ControlFile->wal_level = wal_level;
ControlFile->wal_log_hintbits = walLogHintbits;
UpdateControlFile();
}
}
@ -9480,6 +9485,7 @@ xlog_redo(XLogRecPtr lsn, XLogRecord *record)
ControlFile->max_prepared_xacts = xlrec.max_prepared_xacts;
ControlFile->max_locks_per_xact = xlrec.max_locks_per_xact;
ControlFile->wal_level = xlrec.wal_level;
ControlFile->wal_log_hintbits = walLogHintbits;
/*
* Update minRecoveryPoint to ensure that if recovery is aborted, we