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Failing backups, canceling statement due to conflict with recovery

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Hi.

I'm unable to offload my backups to one of my PG 9.1 hot standbys
using purely streaming replication. After a few hours, usually on the
same large table, pg_dump is failing with 'ERROR:  canceling statement
due to conflict with recovery'.

>From my reading from the documentation, this should not be possible as
my hot standby has 'hot_standby_feedback = on' in its postgresql.conf.

I submitted a bug report a while ago, but am still unsure if this
option has never worked as intended or if I'm misinterpreting the
documentation.

My goal is to reliably make pg_dump backups from a hot standby without
the hot standby lagging far behind the master.

-- 
Stuart Bishop <stuart@xxxxxxxxxxxxxxxx>
http://www.stuartbishop.net/


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