Re: Get stuck when dropping a subscription during synchronizing table

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: tushar <tushar(dot)ahuja(at)enterprisedb(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, Kyotaro HORIGUCHI <horiguchi(dot)kyotaro(at)lab(dot)ntt(dot)co(dot)jp>, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Get stuck when dropping a subscription during synchronizing table
Date: 2017-06-15 15:53:56
Message-ID: 8c9a2af7-6341-8e7d-42ef-a3ffe8068cf5@2ndquadrant.com
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On 6/14/17 18:35, Petr Jelinek wrote:
> Attached fixes it (it was mostly about order of calls).

So do I understand this right that the actual fix is just moving up the
logicalrep_worker_stop() call in DropSubscription().

> I also split the
> SetSubscriptionRelState into 2 separate interface while I was changing
> it, because now that the update_only bool was added it has become quite
> strange to have single interface for what is basically two separate
> functions.

makes sense

> Other related problem is locking of subscriptions during operations on
> them, especially AlterSubscription seems like it should lock the
> subscription itself. I did that in 0002.

More detail here please. AlterSubscription() does locking via
heap_open(). This introduces a new locking method. What are the
implications?

--
Peter Eisentraut http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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