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Custom WAL Resource Managers.

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Allow extensions to specify a new custom resource manager (rmgr),
which allows specialized WAL. This is meant to be used by a Table
Access Method or Index Access Method.

Prior to this commit, only Generic WAL was available, which offers
support for recovery and physical replication but not logical
replication.

Reviewed-by: Julien Rouhaud, Bharath Rupireddy, Andres Freund
Discussion: https://postgr.es/m/ed1fb2e22d15d3563ae0eb610f7b61bb15999c0a.camel%40j-davis.com
This commit is contained in:
Jeff Davis
2022-04-06 22:26:43 -07:00
parent a8cfb0c1a9
commit 5c279a6d35
24 changed files with 526 additions and 70 deletions
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33
src/backend/access/transam/xlogrecovery.c
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@@ -1541,7 +1541,6 @@ ShutdownWalRecovery(void)
void
PerformWalRecovery(void)
{
int rmid;
XLogRecord *record;
bool reachedRecoveryTarget = false;
TimeLineID replayTLI;
@@ -1614,12 +1613,7 @@ PerformWalRecovery(void)
InRedo = true;
/* Initialize resource managers */
for (rmid = 0; rmid <= RM_MAX_ID; rmid++)
{
if (RmgrTable[rmid].rm_startup != NULL)
RmgrTable[rmid].rm_startup();
}
RmgrStartup();
ereport(LOG,
(errmsg("redo starts at %X/%X",
@@ -1756,12 +1750,7 @@ PerformWalRecovery(void)
}
}
/* Allow resource managers to do any required cleanup. */
for (rmid = 0; rmid <= RM_MAX_ID; rmid++)
{
if (RmgrTable[rmid].rm_cleanup != NULL)
RmgrTable[rmid].rm_cleanup();
}
RmgrCleanup();
ereport(LOG,
(errmsg("redo done at %X/%X system usage: %s",
@@ -1881,7 +1870,7 @@ ApplyWalRecord(XLogReaderState *xlogreader, XLogRecord *record, TimeLineID *repl
xlogrecovery_redo(xlogreader, *replayTLI);
/* Now apply the WAL record itself */
RmgrTable[record->xl_rmid].rm_redo(xlogreader);
GetRmgr(record->xl_rmid).rm_redo(xlogreader);
/*
* After redo, check whether the backup pages associated with the WAL
@@ -2111,20 +2100,20 @@ rm_redo_error_callback(void *arg)
void
xlog_outdesc(StringInfo buf, XLogReaderState *record)
{
RmgrId rmid = XLogRecGetRmid(record);
RmgrData rmgr = GetRmgr(XLogRecGetRmid(record));
uint8 info = XLogRecGetInfo(record);
const char *id;
appendStringInfoString(buf, RmgrTable[rmid].rm_name);
appendStringInfoString(buf, rmgr.rm_name);
appendStringInfoChar(buf, '/');
id = RmgrTable[rmid].rm_identify(info);
id = rmgr.rm_identify(info);
if (id == NULL)
appendStringInfo(buf, "UNKNOWN (%X): ", info & ~XLR_INFO_MASK);
else
appendStringInfo(buf, "%s: ", id);
RmgrTable[rmid].rm_desc(buf, record);
rmgr.rm_desc(buf, record);
}
#ifdef WAL_DEBUG
@@ -2273,7 +2262,7 @@ getRecordTimestamp(XLogReaderState *record, TimestampTz *recordXtime)
static void
verifyBackupPageConsistency(XLogReaderState *record)
{
RmgrId rmid = XLogRecGetRmid(record);
RmgrData rmgr = GetRmgr(XLogRecGetRmid(record));
RelFileNode rnode;
ForkNumber forknum;
BlockNumber blkno;
@@ -2353,10 +2342,10 @@ verifyBackupPageConsistency(XLogReaderState *record)
* If masking function is defined, mask both the primary and replay
* images
*/
if (RmgrTable[rmid].rm_mask != NULL)
if (rmgr.rm_mask != NULL)
{
RmgrTable[rmid].rm_mask(replay_image_masked, blkno);
RmgrTable[rmid].rm_mask(primary_image_masked, blkno);
rmgr.rm_mask(replay_image_masked, blkno);
rmgr.rm_mask(primary_image_masked, blkno);
}
/* Time to compare the primary and replay images. */