On Tue, Jun 20, 2017 at 10:55 AM, Peter Eisentraut
> On 6/1/17 13:37, Petr Jelinek wrote:
>> On 01/06/17 17:32, Masahiko Sawada wrote:
>>> On Thu, May 25, 2017 at 5:29 PM, tushar <tushar.ah...@enterprisedb.com>
>>>> After applying all your patches, drop subscription no more hangs while
>>>> dropping subscription but there is an error "ERROR: tuple concurrently
>>>> updated" in the log file of
>>> I tried to reproduce this issue with latest four patches I submit but
>>> it didn't happen. I guess this issue doesn't related to the issues
>>> reported on this thread and another factor might be cause of this
>>> issue. It would be good to test the same again with latest four
>>> patches or after solved current some open items.
>> That's because your additional patch kills the workers that do the
>> concurrent update. While that's probably okay, I still plan to look into
>> making the subscription and state locking more robust.
> It seems we have gotten off track here a bit. What is the current
> proposal to fix "tuple concurrently updated" during DROP SUBSCRiPTION?
I think there is no proposal for it so far. The current proposal is to
fix this problem during ALTER SUBSCRIPTION.
> It seems to me we could just take a stronger lock around
> RemoveSubscriptionRel(), so that workers can't write in there concurrently.
Since we reduced the lock level of updating pg_subscription_rel by
commit 521fd4795e3e the same deadlock issue will appear if we just
take a stronger lock level.
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