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Fast promote mode skips checkpoint at end of recovery.

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pg_ctl promote -m fast will skip the checkpoint at end of recovery so that we
can achieve very fast failover when the apply delay is low. Write new WAL record
XLOG_END_OF_RECOVERY to allow us to switch timeline correctly for downstream log
readers. If we skip synchronous end of recovery checkpoint we request a normal
spread checkpoint so that the window of re-recovery is low.

Simon Riggs and Kyotaro Horiguchi, with input from Fujii Masao.
Review by Heikki Linnakangas
This commit is contained in:
Simon Riggs
2013-01-29 00:06:15 +00:00
parent ee22c55f5a
commit fd4ced5230
5 changed files with 195 additions and 32 deletions
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10
src/backend/access/rmgrdesc/xlogdesc.c
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@@ -18,6 +18,7 @@
#include "access/xlog_internal.h"
#include "catalog/pg_control.h"
#include "utils/guc.h"
#include "utils/timestamp.h"
/*
* GUC support
@@ -119,6 +120,15 @@ xlog_desc(StringInfo buf, uint8 xl_info, char *rec)
memcpy(&fpw, rec, sizeof(bool));
appendStringInfo(buf, "full_page_writes: %s", fpw ? "true" : "false");
}
else if (info == XLOG_END_OF_RECOVERY)
{
xl_end_of_recovery xlrec;
memcpy(&xlrec, rec, sizeof(xl_end_of_recovery));
appendStringInfo(buf, "end_of_recovery: tli %u; time %s",
xlrec.ThisTimeLineID,
timestamptz_to_str(xlrec.end_time));
}
else
appendStringInfo(buf, "UNKNOWN");
}