From: | Amit Langote <amitlangote09(at)gmail(dot)com> |
---|---|
To: | Pavel Borisov <pashkin(dot)elfe(at)gmail(dot)com> |
Cc: | Nitin Jadhav <nitinjadhavpostgres(at)gmail(dot)com>, "houzj(dot)fnst(at)fujitsu(dot)com" <houzj(dot)fnst(at)fujitsu(dot)com>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
Subject: | Re: Partition Check not updated when insert into a partition |
Date: | 2021-10-18 07:28:57 |
Message-ID: | CA+HiwqEHvShtmDurGPq4s4cHk264crxKPtkcbfTW+G-Jf4bd9g@mail.gmail.com |
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Lists: | pgsql-hackers |
Hi Pavel,
On Fri, Oct 15, 2021 at 5:02 PM Pavel Borisov <pashkin(dot)elfe(at)gmail(dot)com> wrote:
>> The lock taken on the parent is either ShareUpdateExclusiveLock or
>> AccessExclusiveLock depending on whether CONCURRENTLY is specified or
>> not. Maybe that should be considered also when locking the children.
>>
>> I've updated the patch that way. (Also, reintroduced the slightly
>> longer commit message that I had added in v3. :))
>
>
> Thanks Amit, for your work!
>
> I am little bit reluctant to the change you made in v5. As per https://www.postgresql.org/docs/14/sql-altertable.html:
>
> > If CONCURRENTLY is specified, ... the second transaction acquires SHARE UPDATE EXCLUSIVE on the partitioned table and ACCESS EXCLUSIVE on the partition, and the detach process completes.
>
> In comment to find_all_inheritors():
>
> > The specified lock type is acquired on all child relations (but not on the given rel; caller should already have locked it)
>
> So I conclude that it is done in a right way in v3 with ACCESS_EXCLUSIVE lock.
Oops, you're right. I had failed to notice when reading the code that
the second transaction takes an AccessExclusiveLock on the target
partition. Reverted back to how this was in v3.
> Also I'd recommend removing the link to a discussion from the test. Anyway we have link in a commit message.
> -- Report: https://postgr.es/m/OS3PR01MB5718DA1C4609A25186D1FBF194089%40OS3PR01MB5718.jpnprd01.prod.outlook.com
Yeah, maybe the link is unnecessary in the test comment, so removed.
Though, I do occasionally see one of those in the test files (try `git
grep https src/test`).
Thanks again.
--
Amit Langote
EDB: http://www.enterprisedb.com
Attachment | Content-Type | Size |
---|---|---|
v6-0001-Invalidate-partitions-of-table-being-attached-det.patch | application/octet-stream | 5.4 KB |
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