Re: postgres standby won't start

Ramalingam, Sankarakumar <Sankarakumar(dot)Ramalingam(at)elavon(dot)com> wrote:

> We have a standby set up between two sites in two different locations. The
> replication was going on well and suddenly it stopped due to error
>
> 2015-09-08 16:07:51 EDT LOG: streaming replication successfully connected to
> primary
>
> 2015-09-08 16:07:51 EDT FATAL: could not receive data from WAL stream: FATAL:
> requested WAL segment 0000000C0000035E000000F0 has already been removed
>
>
>
> I am unable to start the DB as well.
>
> Should I restore a fresh copy from production on to this standby to make things
> in order? If yes, how to go about it. I am quite new to Postgres. Any help/
> suggestions will be greatly appreciated.

Yeah, the master doesn't have/contains the requested WAL-File, you have
to rebuild the replication with a fresh copy from the master. You can
use pg_basebackup, it's well documented.

For the future: increase wal_keep_segments and/or use physical
replications slots, if you are using 9.4 or higher.

Andreas
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