Re: [GENERAL] streaming replication - crash on standby

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От Seong Son (US)
Тема Re: [GENERAL] streaming replication - crash on standby
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Msg-id BY2PR17MB03282B3270332EFDE738227E848B0@BY2PR17MB0328.namprd17.prod.outlook.com
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Ответ на Re: [GENERAL] streaming replication - crash on standby  (Andres Freund <andres@anarazel.de>)
Ответы Re: [GENERAL] streaming replication - crash on standby  (Andres Freund <andres@anarazel.de>)
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I see.  Thank you.

But the Postgresql process had crashed at that time so the streaming replication was no longer working.  Why would it
crashand is that normal? 

Thanks,

Seong


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-----Original Message-----
From: Andres Freund [mailto:andres@anarazel.de]
Sent: Wednesday, August 09, 2017 6:27 PM
To: Seong Son (US) <Seong.Son@datapath.com>
Cc: pgsql-general@postgresql.org
Subject: Re: [GENERAL] streaming replication - crash on standby

Hi,

On 2017-08-09 22:03:43 +0000, Seong Son (US) wrote:
> The last line from pg_xlogdump of the last WAL file on the crashed standby server shows the following.
>
> pg_xlogdump: FATAL:  error in WAL record at DF/4CB95FD0: unexpected pageaddr DB/62B96000 in log segment
00000000000000DF0000004C,offset 12148736 
>
> I believe this means the standby server received WAL file out of order?  But why did it crash?  Is crashing normal
behaviorin case like this? 

This likely just means that that's the end of the WAL.

- Andres


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