Thanks Stephen,
Is there any relation/dependency between status-interval and
wal_sender_timeot.?
I am asking this because even
if I set status-interval
for pg_basebackup to 1 second( the most frequent feedback) I get the same
error:
pg_basebackup: could
not receive data from WAL stream: server closed the connection unexpectedly
This probably means the server terminated abnormally
before or while processing the request.
pg_basebackup: child process
exited with error 1
because the server terminates wal_sender
due to replication timeout.
Best regards,
Andrei
From:
Stephen Frost <sfrost@xxxxxxxxxxx>
To:
AYahorau@xxxxxxxxxxx,
Cc:
Shreeyansh Dba <shreeyansh2014@xxxxxxxxx>,
MikalaiKeida@xxxxxxxxxxx, pgsql-admin <pgsql-admin@xxxxxxxxxxxxxx>
Date:
04/12/2018 17:05
Subject:
Re: pg_basebackup
fails: could not receive data from WAL stream: server closed the connection
unexpectedly
Greetings,
* AYahorau@xxxxxxxxxxx (AYahorau@xxxxxxxxxxx) wrote:
> I reckon we can return to more conventional approach of postgres db
> synchronization:
> 1) SELECT pg_start_backup('label', true);
> 2) rsync/cp $PGDATA directory;
> 3) SELECT pg_stop_backup();
It doesn't seem clear what the goal here is- if you are looking to have
two DB servers that are synchronized, then using pg_basebackup to get
the initial copy and then running PostgreSQL as a replica would be the
right approach.
I certainly wouldn't recommend trying to hack together something with
rsync or cp or using the exclusive backup mode at all- if the system
crashes when that exclusive backup is happening, the database won't come
back up.
> I have a question. What is your opinion about pg_basebackup utility
and
> its behaviour for this condition? Is it a bug? Should it be
fixed?
No, I don't see any bug here, but if you adjust the timeout values on
the server then you need to tell pg_basebackup to send messages to the
server more frequently or it's going to get timed out. That's what
the
--status-interval option in pg_basebackup is for.
Thanks!
Stephen
[attachment "signature.asc" deleted by Andrei Yahorau/IBA]
