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<p class="x_MsoNormal">Make sense. Appreciate for the answer!</p>
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<p class="x_MsoNormal" style="border:none; padding:0in"><b>From: </b><a href="mailto:ishii@sraoss.co.jp">Tatsuo Ishii</a><br>
<b>Sent: </b>Tuesday, July 4, 2017 4:44 PM<br>
<b>To: </b><a href="mailto:hiscal@outlook.com">hiscal@outlook.com</a><br>
<b>Cc: </b><a href="mailto:pgpool-general@pgpool.net">pgpool-general@pgpool.net</a><br>
<b>Subject: </b>Re: [pgpool-general: 5603] About pgpool backend and failover-command</p>
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<font size="2"><span style="font-size:10pt;">
<div class="PlainText">> Thank you Tatsuo.<br>
> <br>
> <br>
> <br>
> For question1, on pgpool FIRST startup, will it check automatically from all of the backends to find out who is the master pg server?<br>
<br>
Yes.<br>
<br>
> And only when failover it will then use the youngest node id as master?<br>
<br>
Yes.<br>
<br>
Actually there's no difference in the logic between start up and<br>
failover regarding finding master (primary). Pgpool-II decides the<br>
youngest node as the master which is *not* standby (i.e. return false<br>
against pg_is_in_recovery()).<br>
<br>
Best regards,<br>
--<br>
Tatsuo Ishii<br>
SRA OSS, Inc. Japan<br>
English: <a href="http://www.sraoss.co.jp/index_en.php">http://www.sraoss.co.jp/index_en.php</a><br>
Japanese:http://www.sraoss.co.jp<br>
<br>
> From: Tatsuo Ishii<<a href="mailto:ishii@sraoss.co.jp">mailto:ishii@sraoss.co.jp</a>><br>
> Sent: Tuesday, July 4, 2017 3:56 PM<br>
> To: hiscal@outlook.com<<a href="mailto:hiscal@outlook.com">mailto:hiscal@outlook.com</a>><br>
> Cc: pgpool-general@pgpool.net<mailto:pgpool-general@pgpool.net><br>
> Subject: Re: [pgpool-general: 5603] About pgpool backend and failover-command<br>
> <br>
> <br>
> <br>
>> Hi, all<br>
>><br>
>> Iʼm new to pgpool, I have two questions here, can anyone give some advises? Thanks a lot.<br>
> <br>
> Welcome to Pgpool-II world:-)<br>
> <br>
>> 1. I have two PostgreSQL server running as master and slave with streaming replication mode, so is it a MUST that the master PostgreSQL server should be defined as backend0 and slave as backend1?<br>
> <br>
> No. The master can be either backend0 or backend1.<br>
> <br>
>> 2. The failover command will touch a trigger file to the new master, but which account will pgpool to execute the command?<br>
> <br>
> The same account as pgpool process starts.<br>
> <br>
> Best regards,<br>
> --<br>
> Tatsuo Ishii<br>
> SRA OSS, Inc. Japan<br>
> English: <a href="http://www.sraoss.co.jp/index_en.php">http://www.sraoss.co.jp/index_en.php</a><br>
> Japanese:http://www.sraoss.co.jp<br>
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