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Date: Mon, 27 Aug 2018 20:38:19 +0200
From: Christoph Berg <myon@debian.org>
To: pavan95 <pavan.postgresdba@gmail.com>
Cc: pgsql-admin@postgresql.org
Subject: Re: Space Related Errors in Postgres 10.4 Logical Replication
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Re: pavan95 2018-08-20 <1534743876524-0.post@n3.nabble.com>
> *PUBLISHER LOG:*
> *2018-08-20 10:34:55.801 IST [24955] user@db ERROR:  could not create
> directory "pg_replslot/mysub_14211111_sync_111111.tmp": No space left on
> device *

This is simply what it says: your disk was full. You need to make sure
PG has enough free disk space available.

Christoph