From: | Keisuke Kuroda <keisuke(dot)kuroda(dot)3862(at)gmail(dot)com> |
---|---|
To: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
Cc: | PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
Subject: | Re: Logical replication CPU-bound with TRUNCATE/DROP/CREATE many tables |
Date: | 2020-09-30 05:39:03 |
Message-ID: | CANDwggLtCjuLyhSbR-uJBect09io4uwKGREqOyhYZeq--G8kEw@mail.gmail.com |
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Lists: | pgsql-hackers |
Hi Amit,
> I don't have a patch for this idea but you can refer [1]
> (v25-0002-Issue-individual-invalidations-with-wal_level-lo) to see
> what I was trying to say about registering the invalidations in the
> form of ReorderBufferChange. We have something along the lines of what
> I described above in that patch but we have removed it because we need
> all the invalidations to be accumulated to handle aborts and we don't
> want two different mechanisms to store invalidations.
Thanks, I read the patch
(v25-0002-Issue-individual-invalidations-with-wal_level-lo)
and the review.
I understand the following.
* In v25-0002, there were two different mechanisms,
XLOG_XACT_INVALIDATIONS (ReorderBufferAddInvalidation) and
XLOG_INVALIDATIONS (ReorderBufferAddInvalidations).
* After a review, XLOG_XACT_INVALIDATIONS was implemented to
generate all invalidation messages.
I'm going to write a patch that looks like the following.
* Add the process of collecting invalidation to
XLOG_XACT_INVALIDATIONS in the form of ReorderBufferChange.
* Invalidation is executed in case
REORDER_BUFFER_CHANGE_INVALIDATION.
Best Regards,
--
Keisuke Kuroda
NTT Software Innovation Center
keisuke(dot)kuroda(dot)3862(at)gmail(dot)com
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