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From: Jerry Sievers <gsievers19@comcast.net>
To: pgorg_aav <kahitarich-postgresorg@yahoo.com>
Cc: pgsql-admin\@postgresql.org <pgsql-admin@postgresql.org>
Subject: Re: streaming replication sent location not advancing - feature request?
Date: Fri, 07 Mar 2014 11:07:47 -0600
Message-ID: <86wqg6os2k.fsf@jerry.enova.com> (raw)
In-Reply-To: <1394153429.37920.YahooMailNeo@web120301.mail.ne1.yahoo.com>
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pgorg_aav <kahitarich-postgresorg@yahoo.com> writes:

> Hi,
>
> With wal shipping it is possible to pull the WAL files in advance from the master.
> Is it possible to do something similar for streaming replication?

wal_keep_segments  <something higher>

Otherwise just use the already supported hybrid of WAL archiving and
streaming.

> This morning due to VM hardware issues, a couple of standbys lagged (A LOT) behind master
>
> # select * from pg_stat_replication ;
>   pid  | usesysid | usename  | application_name |  client_addr  | client_hostname | client_port |         backend_start         |   state   | sent_location |
> write_location | flush_location | replay_location | sync_priority | sync_state
> -------+----------+----------+------------------+---------------+-----------------+-------------+-------------------------------+-----------+---------------+----------------+----------------+-----------------+---------------+------------
> ...=x8 snipped 
>   1758 |       10 | postgres | walreceiver      | 172.26.149.47 |                 |       34798 | 2014-02-04 14:48:51.318344-05 | streaming | 1D0/C49A9BE0  | 1D0/
> C49A9BE0   | 1D0/C49A9BE0   | 1D0/C49A9B38    |             0 | async
>  16072 |       10 | postgres | walreceiver      | 172.26.115.48 |                 |       57152 | 2013-12-07 09:25:21.713723-05 | streaming | 1C8/11B40000  | 1C8/
> 119A0000   | 1C8/11900000   | 1C8/117EDAB8    |             0 | async
> (9 rows)
>
> Thanks much in advance,
> Amit
>

-- 
Jerry Sievers
Postgres DBA/Development Consulting
e: postgres.consulting@comcast.net
p: 312.241.7800


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