<div dir="ltr">Can you combine it with weight?<div><br></div><div>This would allow weight to be the physical capability metric, with <span style="font-size:13px;font-family:arial,sans-serif">database_redirect_preference_</span><span class="" style="font-size:13px;font-family:arial,sans-serif">list</span><span style="font-size:13px;font-family:arial,sans-serif"> handling the logical routing.</span></div><div><br></div><div><font face="arial, sans-serif">so:</font></div><div><font face="arial, sans-serif"><br></font></div><div><font face="arial, sans-serif"> </font><font face="monospace">backend0_weight = 2</font></div><div><font face="monospace"> backend1_weight = 2</font></div><div><font face="monospace"> backend2_weight = 1<br></font></div><div><font face="monospace"><span style="font-size:13px"> database_redirect_preference_</span><span class="" style="font-size:13px">list</span><span style="font-size:13px"> = '.*:standby'</span><br></font></div><div><span style="font-size:13px;font-family:arial,sans-serif"><br></span></div><div>Would result in the following:<br></div><div><br></div><div>If node0 master:</div><div><ul><li>node0 = 0% reads (master, weight not used)</li><li>node1 = 66% reads</li><li>node2 = 33% reads</li></ul></div><div><font face="arial, sans-serif">If node2 master</font></div><div><ul><li><font face="arial, sans-serif">node0 = 50% reads</font></li><li><font face="arial, sans-serif">node1 = 50% reads</font></li><li><font face="arial, sans-serif">node2 = 0% reads (master, weight not used)</font></li></ul><div><font face="arial, sans-serif">Is this possible?</font></div></div><div><font face="arial, sans-serif"><br></font></div><div><font face="arial, sans-serif">Cheers,</font></div></div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature"><div style="color:#b8276a;font:bold 14px Arial,Helvetica,sans-serif">
<br>
<span style="color:#323b62">James Sewell,</span><br>
<span style="color:#a9a9a9"><span style="font:12px Arial,Helvetica,sans-serif">PostgreSQL Team Lead / Solutions Architect </span></span><br>
<span style="color:#a9a9a9">______________________________________</span><br>
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<br><div class="gmail_quote">On Fri, Nov 28, 2014 at 3:25 PM, Tatsuo Ishii <span dir="ltr"><<a href="mailto:ishii@postgresql.org" target="_blank">ishii@postgresql.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Yes. If "standby" is specified by the parameter, pgpool-II will choose<br>
one of standby nodes taking consideration of "weight" paramter.<br>
<span class="im HOEnZb"><br>
Best regards,<br>
--<br>
Tatsuo Ishii<br>
SRA OSS, Inc. Japan<br>
English: <a href="http://www.sraoss.co.jp/index_en.php" target="_blank">http://www.sraoss.co.jp/index_en.php</a><br>
Japanese:<a href="http://www.sraoss.co.jp" target="_blank">http://www.sraoss.co.jp</a><br>
<br>
</span><span class="im HOEnZb">> Oh!<br>
><br>
> Could this new setting be used to achieve my previous example?<br>
><br>
> So have read weights for all, and use this?<br>
><br>
> Cheers,<br>
><br>
><br>
> James Sewell,<br>
> PostgreSQL Team Lead / Solutions Architect<br>
> ______________________________________<br>
><br>
><br>
</span><div class="HOEnZb"><div class="h5">> Level 2, 50 Queen St, Melbourne VIC 3000<br>
><br>
> *P *<a href="tel:%28%2B61%29%203%208370%208000" value="+61383708000">(+61) 3 8370 8000</a> *W* <a href="http://www.lisasoft.com" target="_blank">www.lisasoft.com</a> *F *<a href="tel:%28%2B61%29%203%208370%208099" value="+61383708099">(+61) 3 8370 8099</a><br>
><br>
><br>
> On Tue, Nov 25, 2014 at 11:57 AM, Tatsuo Ishii <<a href="mailto:ishii@postgresql.org">ishii@postgresql.org</a>> wrote:<br>
><br>
>> BTW from pgpool-II 3.4.0, you could achieve this by using new parameter.<br>
>><br>
>> database_redirect_preference_list = '.*:standby'<br>
>><br>
>> This will redirect all read only SELECTs to the standby (or one of<br>
>> standbys if you have multiple of them) regardless of the physical node<br>
>> id of primary.<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" target="_blank">http://www.sraoss.co.jp/index_en.php</a><br>
>> Japanese:<a href="http://www.sraoss.co.jp" target="_blank">http://www.sraoss.co.jp</a><br>
>><br>
>> > Well I think the real problem here is, the configuration of weight is<br>
>> > bound to physical node. Ideally the weight should be bound to the<br>
>> > "logical" or "role" of the node: primary (master) or standbye (slave).<br>
>> > This way, you don't need to change the weight parameter after role of<br>
>> > the nodes are swapped. What do you think?<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" target="_blank">http://www.sraoss.co.jp/index_en.php</a><br>
>> > Japanese:<a href="http://www.sraoss.co.jp" target="_blank">http://www.sraoss.co.jp</a><br>
>> ><br>
>> >> Hello,<br>
>> >><br>
>> >> This method works well, but doesn't really play nicely with our use of<br>
>> >> Puppet (which manages the config files).<br>
>> >><br>
>> >> Would anyone support looking into a pcp command to change this? I may<br>
>> have<br>
>> >> some time early in the new year to have a go at an implementation.<br>
>> >><br>
>> >> I was thinking a very simple:<br>
>> >><br>
>> >> pcp_node_weight timeout hostname port# username password nodeID<br>
>> newweight<br>
>> >><br>
>> >> Maybe there is a reason this won't work / isn't a good idea though?<br>
>> >><br>
>> >> Cheers,<br>
>> >><br>
>> >><br>
>> >><br>
>> >><br>
>> >><br>
>> >><br>
>> >> James Sewell,<br>
>> >> PostgreSQL Team Lead / Solutions Architect<br>
>> >> ______________________________________<br>
>> >><br>
>> >><br>
>> >> Level 2, 50 Queen St, Melbourne VIC 3000<br>
>> >><br>
>> >> *P *<a href="tel:%28%2B61%29%203%208370%208000" value="+61383708000">(+61) 3 8370 8000</a> *W* <a href="http://www.lisasoft.com" target="_blank">www.lisasoft.com</a> *F *<a href="tel:%28%2B61%29%203%208370%208099" value="+61383708099">(+61) 3 8370 8099</a><br>
>> >><br>
>> >><br>
>> >> On Tue, Jul 15, 2014 at 5:38 PM, Tatsuo Ishii <<a href="mailto:ishii@postgresql.org">ishii@postgresql.org</a>><br>
>> wrote:<br>
>> >><br>
>> >>> > Hey All,<br>
>> >>> ><br>
>> >>> > I have two nodes setup like so:<br>
>> >>> ><br>
>> >>> > - Node 1: Master, weight 0<br>
>> >>> > - Node 2: Slave, weight 1<br>
>> >>> ><br>
>> >>> > This allows me to send all writes to the master and all reads to the<br>
>> >>> slave.<br>
>> >>> ><br>
>> >>> > At some stage I promote the slave to be the new master (pcp_promote<br>
>> with<br>
>> >>> > DISALLOW_TO_FAILOVER), then at some stage later re-provision the<br>
>> master<br>
>> >>> as<br>
>> >>> > a new slave and re-connect it (pcp_enable)<br>
>> >>> ><br>
>> >>> > I now have the following setup:<br>
>> >>> ><br>
>> >>> > - Node 1: Slave, weight 0<br>
>> >>> > - Node 2: Master, weight 1<br>
>> >>> ><br>
>> >>> > This means that all write and read queries are serviced by the new<br>
>> >>> master,<br>
>> >>> > and none by the new slave.<br>
>> >>> ><br>
>> >>> > Is there a way around this? If there isn't currently could a pcp<br>
>> command<br>
>> >>> be<br>
>> >>> > implemented which would allow me to manage my own weights?<br>
>> >>><br>
>> >>> You could change weight parameters in pgpool.conf then reload it.<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" target="_blank">http://www.sraoss.co.jp/index_en.php</a><br>
>> >>> Japanese:<a href="http://www.sraoss.co.jp" target="_blank">http://www.sraoss.co.jp</a><br>
>> >>><br>
>> >>> > Cheers,<br>
>> >>> ><br>
>> >>> ><br>
>> >>> ><br>
>> >>> > James Sewell,<br>
>> >>> > PostgreSQL Team Lead / Solutions Architect<br>
>> >>> > ______________________________________<br>
>> >>> ><br>
>> >>> ><br>
>> >>> > Level 2, 50 Queen St, Melbourne VIC 3000<br>
>> >>> ><br>
>> >>> > *P *<a href="tel:%28%2B61%29%203%208370%208000" value="+61383708000">(+61) 3 8370 8000</a> *W* <a href="http://www.lisasoft.com" target="_blank">www.lisasoft.com</a> *F *<a href="tel:%28%2B61%29%203%208370%208099" value="+61383708099">(+61) 3 8370 8099</a><br>
>> >>> ><br>
>> >>> > --<br>
>> >>> ><br>
>> >>> ><br>
>> >>> > ------------------------------<br>
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