Re: [HACKERS] Get stuck when dropping a subscription duringsynchronizing table

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От Michael Paquier
Тема Re: [HACKERS] Get stuck when dropping a subscription duringsynchronizing table
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Msg-id CAB7nPqQ2vtbLswMTmCJyC-SAWAa4y=HpSG7VQUBHPu5wxW-sfA@mail.gmail.com
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Ответ на Re: [HACKERS] Get stuck when dropping a subscription duringsynchronizing table  (Masahiko Sawada <sawada.mshk@gmail.com>)
Ответы Re: [HACKERS] Get stuck when dropping a subscription duringsynchronizing table  (Masahiko Sawada <sawada.mshk@gmail.com>)
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On Wed, May 10, 2017 at 11:57 AM, Masahiko Sawada <sawada.mshk@gmail.com> wrote:
> Barring any objections, I'll add these two issues to open item.

It seems to me that those open items have not been added yet to the
list. If I am following correctly, they could be defined as follows:
- Dropping subscription may stuck if done during tablesync.
-- Analyze deadlock issues with DROP SUBSCRIPTION and apply worker process.
-- Avoid orphaned tablesync worker if apply worker exits before
changing its status.

I am playing with the code to look at both of them... But feel free to
update this thread if I don't show up. There are no test cases, but
some well-placed pg_usleep calls should make both issues easily
reproducible. I have the gut feeling that other things are hidden
behind though.
-- 
Michael



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