[pgpool-general: 5365] Re: How to understand 'load_balance_node'in pgpool-II 3.6.1

[晓庆]

Hi Tatsuo,

Thank you very much for your explanation!

Regards,
Paul wang




------------------ Original ------------------
From:  "Tatsuo Ishii";<ishii at sraoss.co.jp>;
Date:  Tue, Mar 14, 2017 01:50 PM
To:  "晓庆"<paul_wang79 at qq.com>; 
Cc:  "pgpool-general"<pgpool-general at pgpool.net>; 
Subject:  Re: [pgpool-general: 5363] How to understand 'load_balance_node'in pgpool-II 3.6.1



> Hi,
> My pgpool upgrade from 3.5.x to 3.6.1. When I execute 'show pool_nodes', I see a different return result, It's cool!
> But I want to know what's the meaning of 'load_balance_node'?
> Maybe it means that the 'true' node is responsible for the 'load balancer',Is that right?
> Note: I have two Pgpool nodes and two postgresql nodes, I configured VIP in pgpool nodes;
> 
> 
> 
> postgres=# show pool_nodes;
>  node_id |  hostname  | port | status | lb_weight |  role   | select_cnt | load_balance_node | replication_delay 
> ---------+------------+------+--------+-----------+---------+------------+-------------------+-------------------
>  0       | pg-server1 | 5432 | up     | 0.500000  | primary | 0          | false             | 0
>  1       | pg-server2 | 5432 | up     | 0.500000  | standby | 0          | true              | 0
> (2 rows)

The load balance node is the database node which read only user
queries are sent to. In your case above pg-server2 will accept read
only queries. Please note that there are some cases read queries are
sent to pg-server1. e.g. internal queries issued by Pgpool-II (mostly
to check PostgreSQL's system catalogs).

Best regards,
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese:http://www.sraoss.co.jp
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