| From: | Greg Stark <stark(at)mit(dot)edu> |
|---|---|
| To: | Kyotaro HORIGUCHI <horiguchi(dot)kyotaro(at)lab(dot)ntt(dot)co(dot)jp> |
| Cc: | Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, Jonathon Nelson <jdnelson(at)dyn(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, PostgreSQL Bugs <pgsql-bugs(at)postgresql(dot)org> |
| Subject: | Re: Bug in Physical Replication Slots (at least 9.5)? |
| Date: | 2018-01-19 11:28:58 |
| Message-ID: | CAM-w4HMU==SkHHzS6KDSrNiKU9vk2R4TG73M4FJzA-8Yui34+g@mail.gmail.com |
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On 19 January 2017 at 09:37, Kyotaro HORIGUCHI
<horiguchi(dot)kyotaro(at)lab(dot)ntt(dot)co(dot)jp> wrote:
>
> Though I haven't look closer to how a modification is splitted
> into WAL records. A tuple cannot be so long. As a simple test, I
> observed rechder->xl_tot_len at the end of XLogRecordAssemble
> inserting an about 400KB not-so-compressable string into a text
> column, but I saw a series of many records with shorter than
> several thousand bytes.
I think the case to check is a commit record with many thousands of
subtransactions. I'm not sure you can fill a whole segment though.
--
greg
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