[pgpool-general: 6148] Re: What happens when node is assigned as shutdown

Mariel Cherkassky mariel.cherkassky at gmail.com
Tue Jun 26 23:53:02 JST 2018

But what if my standby didnt fail ? I mean, in my case I had a network
conflict between the standby and the pool. The standby was up and was
working. In that case stil the session will be disconneced ? And why only
in case the load_balance_mode is off the seesion will not be disrupted ?
Isnt it suppose to be the the opposite ? I have 2 standbys and In case one
of my standby`s is down or doesnt work all the current sessions to him will
be moved to the second standby.


2018-06-26 17:20 GMT+03:00 Pierre Timmermans <ptim007 at yahoo.com>:

> Note that if standby node fails and if load_balance_node is off, then the
> pgpool connection will not be disrupted by the failover happening on the
> standby (at least with recent version of pgpool): this is documented in the
> doc and I can confirm that it is working in my tests.
> In all other cases the backend connection will be disconnected and I
> suppose the client will receive an error and the query result will be lost
> Pierre
> On Tuesday, June 26, 2018, 3:35:41 PM GMT+2, Mariel Cherkassky <
> mariel.cherkassky at gmail.com> wrote:
> The moment the pool assign the shutdown status to a specific node all
> active session to that node are closed immediatly ?
> 2018-06-26 16:11 GMT+03:00 Tatsuo Ishii <ishii at sraoss.co.jp>:
> > Hi,
> > I wanted to understand what happens to a session that was opened from the
> > pool to   one of the nodes in my cluster (query that is taking x time).
> > Suddenly there was a network conflict between the pool node and the
> > database node and the pool change the status of the database node to
> > shutdown(the node is slave). What happens to the query that runned ? What
> > happens to the session that was open ?
> The session will be closed. This is pretty much similar when you
> directly connect to PostgreSQL.
> > Will the output of the query will
> > come back to the user ?
> Though it really depends on the timing of failure, probably the output
> of the query will not come bacl to the user in most cases.
> Best regards,
> --
> Tatsuo Ishii
> SRA OSS, Inc. Japan
> English: http://www.sraoss.co.jp/index_ en.php
> <http://www.sraoss.co.jp/index_en.php>
> Japanese:http://www.sraoss.co. jp <http://www.sraoss.co.jp>
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