| From: | Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com> |
|---|---|
| To: | Petr Jelinek <petr(dot)jelinek(at)2ndquadrant(dot)com>, Noah Misch <noah(at)leadboat(dot)com> |
| Cc: | Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: tablesync patch broke the assumption that logical rep depends on? |
| Date: | 2017-04-20 16:58:17 |
| Message-ID: | 00942f25-e31f-b38d-4654-52beaf942603@2ndquadrant.com |
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| Lists: | pgsql-hackers |
On 4/18/17 22:13, Petr Jelinek wrote:
> So my idea was to add some kind of inuse flag. This turned out to be bit
> more complicated in terms of how to clean it than I would have hoped.
> This is due to the fact that there is no way to reliably tell if worker
> has failed to start if the parent worker crashed while waiting.
>
> My solution to that is to use similar logic to autovacuum where we use
> timeout for worker to attach to shmem. We do this only if there is no
> free slot found when launch of replication worker was requested.
It looks like launch_time is never set the current time in your patch.
--
Peter Eisentraut http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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