| From: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
|---|---|
| To: | Andres Freund <andres(at)anarazel(dot)de> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Pg Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, David Fetter <david(at)fetter(dot)org>, Rahila Syed <rahila(dot)syed(at)2ndquadrant(dot)com>, Pavan Deolasee <pavan(dot)deolasee(at)gmail(dot)com>, Amit Langote <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp> |
| Subject: | Re: monitoring CREATE INDEX [CONCURRENTLY] |
| Date: | 2019-03-29 15:16:37 |
| Message-ID: | 20190329151637.GA28886@alvherre.pgsql |
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| Lists: | pgsql-hackers |
On 2019-Mar-29, Andres Freund wrote:
> Hi,
>
> On 2019-03-29 12:02:18 -0300, Alvaro Herrera wrote:
> > I just noticed that the CLUSTER calls index_build, which my patch
> > modifies to include additional progress metrics; this means that during
> > the index build phase, the metrics set by CLUSTER will be trashed by the
> > ones my patch introduces.
>
> Yea, it really seems that the index build infrastructure needs to
> support cooperating with the caller's progress reporting. For CLUSTER,
> REINDEX, ALTER TABLE rewrites etc, they all would likely want to have
> insight into the index build while also having their own progress.
So, CLUSTER and ALTER TABLE rewrites only do non-concurrent index
builds; and REINDEX can reuse pretty much the same wait-for metrics
columns as CIC. So I think it's okay if I move only the metrics that
conflict for index_build.
--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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