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@snowman.net> To: AYahorau@ibagroup.eu, Cc: Shreeyansh Dba <shreeyansh2014@gmail.com>, MikalaiKeida@ibagroup.eu, pgsql-admin <pgsql-admin@postgresql.org> 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@ibagroup.eu (AYahorau@ibagroup.eu) 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]
