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[GENERAL] Shared WAL archive between master and standby: WALs not always identical - Mailing list pgsql-general

From Sasa Vilic
Subject [GENERAL] Shared WAL archive between master and standby: WALs not always identical
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Msg-id CAOJhpYdJioGkS1-puGC911nmneet_Eq=F86wp6v8C7G2W8bO8w@mail.gmail.com
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Responses Re: [GENERAL] Shared WAL archive between master and standby: WALs notalways identical  (Adrian Klaver <adrian.klaver@aklaver.com>)
Re: [GENERAL] Shared WAL archive between master and standby: WALs notalways identical  ("David G. Johnston" <david.g.johnston@gmail.com>)
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Hallo,

I am trying to setup shared WAL archive between master and standby. Standby is synchronously streaming from master and both servers run with archive_mode = always. The ideas is that when promoting standby to master we would not missed WALs.

My problem is that sometimes WAL uploaded from master and from slave are not 100% identical. In most cases they are but occasionally they are not. I have written small script that ensures that upload is free of race condition and I log md5 sum of each WAL. Aren't WALs from master and standby supposed to be identical? After all, standby is just consuming WAL that it is receiving from master ...

Or do you have any better suggestion on how to achieve continuous incremental backup?

Thanks in advance

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