Re: MarkBufferDirtyHint() and LSN update

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От Robert Haas
Тема Re: MarkBufferDirtyHint() and LSN update
Дата
Msg-id CA+TgmobidaRMiMz9RCBXXTsyGnGuE6z9twiH2-WPBmoUWrKiSg@mail.gmail.com
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Ответ на MarkBufferDirtyHint() and LSN update  (Antonin Houska <ah@cybertec.at>)
Ответы Re: MarkBufferDirtyHint() and LSN update
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On Wed, Oct 30, 2019 at 9:43 AM Antonin Houska <ah@cybertec.at> wrote:
> 5. In the first session, FlushBuffer()->TerminateBufferIO() will not clear
> BM_DIRTY because MarkBufferDirtyHint() has eventually set
> BM_JUST_DIRTIED. Thus the hint bit change itself will be written by the next
> call of FlushBuffer(). However page LSN is hasn't been updated so the
> requirement that WAL must be flushed first is not met.

This part confuses me. Are you saying that MarkBufferDirtyHint() can
set BM_JUST_DIRTIED without setting BM_DIRTY?

-- 
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company



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