[pgpool-general: 1781] Re: [PGPOOL] online recovery fails due to "WAL ends before end of online backup"

[Tatsuo Ishii]

Does the problem happen even if you disable watchdog?
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese: http://www.sraoss.co.jp

> Dear pgpool developers,
> 
> I encounter an issue while doing online recovery. I try to solve the problem but still have no idea about it. Recovery usually fails in the step: remote restart database server. It displays “FATAL: WAL ends before end of online backup. HINT: Online backup started with pg_start_backup() must be ended with pg_stop_backup(), and all WAL up to that point must be available at recovery.”
> 
> Software:
> OS: Ubuntu 12.04.2 LTS/Server/precise
> pgpool version: pgpool-II-3.2.3
> postgresql version: postgresql_9.2.2
> 
> Environment:
> 2 pgpools: PG0 and PG1 (with watchdog on)
> 2 databases: DB0 and DB1
> 
> Reproduce steps:
> 
> 1.      Update data via VIP. (23.7kB size JPEG pictures were kept being updated to the database via VIP. And there are 10 requests in one second.)
> 
> 2.      Stop DB1 service.
> 
> 3.      Use pcp_recovery_node to do recovery on PG1.
> 
> 4.      Recovery done.
> 
> Note that recovery usually fails at remote restart. It is interesting that the success rate of online recovery is higher when updating DB with only text than with pictures.
> 
> Regards,
> Tina