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Add num_done counter to the pg_stat_checkpointer view.

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Checkpoints can be skipped when the server is idle. The existing num_timed and
num_requested counters in pg_stat_checkpointer track both completed and
skipped checkpoints, but there was no way to count only the completed ones.

This commit introduces the num_done counter, which tracks only completed
checkpoints, making it easier to see how many were actually performed.

Bump catalog version.

Author: Anton A. Melnikov
Reviewed-by: Fujii Masao
Discussion: https://postgr.es/m/9ea77f40-818d-4841-9dee-158ac8f6e690@oss.nttdata.com
This commit is contained in:
Fujii Masao
2024-09-30 11:56:05 +09:00
parent 20cfec896c
commit 559efce1d6
11 changed files with 60 additions and 19 deletions
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39
src/backend/postmaster/checkpointer.c
View File

@@ -460,10 +460,7 @@ CheckpointerMain(char *startup_data, size_t startup_data_len)
* Do the checkpoint.
*/
if (!do_restartpoint)
{
CreateCheckPoint(flags);
ckpt_performed = true;
}
ckpt_performed = CreateCheckPoint(flags);
else
ckpt_performed = CreateRestartPoint(flags);
@@ -484,7 +481,7 @@ CheckpointerMain(char *startup_data, size_t startup_data_len)
ConditionVariableBroadcast(&CheckpointerShmem->done_cv);
if (ckpt_performed)
if (!do_restartpoint)
{
/*
* Note we record the checkpoint start time not end time as
@@ -493,18 +490,32 @@ CheckpointerMain(char *startup_data, size_t startup_data_len)
*/
last_checkpoint_time = now;
if (do_restartpoint)
PendingCheckpointerStats.restartpoints_performed++;
if (ckpt_performed)
PendingCheckpointerStats.num_performed++;
}
else
{
/*
* We were not able to perform the restartpoint (checkpoints
* throw an ERROR in case of error). Most likely because we
* have not received any new checkpoint WAL records since the
* last restartpoint. Try again in 15 s.
*/
last_checkpoint_time = now - CheckPointTimeout + 15;
if (ckpt_performed)
{
/*
* The same as for checkpoint. Please see the
* corresponding comment.
*/
last_checkpoint_time = now;
PendingCheckpointerStats.restartpoints_performed++;
}
else
{
/*
* We were not able to perform the restartpoint
* (checkpoints throw an ERROR in case of error). Most
* likely because we have not received any new checkpoint
* WAL records since the last restartpoint. Try again in
* 15 s.
*/
last_checkpoint_time = now - CheckPointTimeout + 15;
}
}
ckpt_active = false;