Re: RFC: replace pg_stat_activity.waiting with something more descriptive - Mailing list pgsql-hackers

From Thomas Reiss
Subject Re: RFC: replace pg_stat_activity.waiting with something more descriptive
Date
Msg-id 56E80B56.5070308@dalibo.com
Whole thread Raw
In response to Re: RFC: replace pg_stat_activity.waiting with something more descriptive  (Amit Kapila <amit.kapila16@gmail.com>)
Responses Re: RFC: replace pg_stat_activity.waiting with something more descriptive  (Robert Haas <robertmhaas@gmail.com>)
List pgsql-hackers
Hello,

Here's a small docpatch to fix two typos in the new documentation.

Regards,
Thomas


Le 11/03/2016 07:19, Amit Kapila a écrit :
On Fri, Mar 11, 2016 at 12:28 AM, Robert Haas <robertmhaas@gmail.com> wrote:
>
>
> Committed with some further editing.  In particular, the way you
> determined whether we could safely access the tranche information for
> any given ID was wrong; please check over what I did and make sure
> that isn't also wrong.
>

There are few typos which I have tried to fix with the attached patch.  Can you tell me what was wrong with the way it was done in patch?


@@ -4541,9 +4542,10 @@ AbortSubTransaction(void)
  */
  LWLockReleaseAll();
 
+ pgstat_report_wait_end();
+ pgstat_progress_end_command();
  AbortBufferIO();
  UnlockBuffers();
- pgstat_progress_end_command();
 
  /* Reset WAL record construction state */
  XLogResetInsertion();
@@ -4653,6 +4655,9 @@ AbortSubTransaction(void)
  */
  XactReadOnly = s->prevXactReadOnly;
 
+ /* Report wait end here, when there is no further possibility of wait */
+ pgstat_report_wait_end();
+
  RESUME_INTERRUPTS();
 }

AbortSubTransaction() does call pgstat_report_wait_end() twice, is this intentional? I have kept it in the end because there is a chance that in between API's can again set the state to wait and also by that time we have not released buffer pins and heavyweight locks, so not sure if it makes sense to report wait end at that stage.  I have noticed that in WaitOnLock(), on error the wait end is set, but now again thinking on it, it seems it will be better to set it in AbortTransaction/AbortSubTransaction at end.  What do you think?


With Regards,
Amit Kapila.
EnterpriseDB: http://www.enterprisedb.com



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