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<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> Seems I have an additional data point: the sync test always takes longer (> 20 secs) if I include conninfo for all cluster nodes instead of just the local node. I had previously thought conninfo
data was only used when needed. Is this not the case?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> Tom </span>
<span style="font-size:11.0pt;font-family:Wingdings">J</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="color:black">From: </span></b><span style="color:black">Tom Tignor <ttignor@akamai.com><br>
<b>Date: </b>Monday, September 12, 2016 at 10:52 AM<br>
<b>To: </b>"slony1-general@lists.slony.info" <slony1-general@lists.slony.info><br>
<b>Subject: </b>sync performance<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Times New Roman""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> Hello slony1 community,</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> We’ve recently been testing communication reliability between our cluster nodes. Our config is a simple setup with one provider producing a modest volume of changes (measured in KB/s) consumed
by 5 direct subscribers, though these are geographically distributed. The test is just a sync event followed by a wait on the sync originator. Example:</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">cluster name = ams_cluster;</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">node 5 admin</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> conninfo='dbname=ams</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> host=23.79.242.182</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> user=ams_slony</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> sslmode=verify-ca</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> sslcert=/usr/local/akamai/.ams_certs/complete-ams_slony.crt</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> sslkey=/usr/local/akamai/.ams_certs/ams_slony.private_key</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> sslrootcert=/usr/local/akamai/etc/ssl_ca/canonical_ca_roots.pem';</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">node 2 admin conninfo = 'dbname=ams user=ams_slony';</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">sync(id=2);</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">wait for event (origin=2, confirmed=5, wait on=2, timeout=30);</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> Tests show the script takes 10-20 secs to run on different nodes.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> Can anyone explain what’s happening internally during this time, and why it takes so long? On a healthy, lightly loaded system, we might have hoped for a sync response in just a couple seconds.
Our slon daemons are running with mostly default startup options.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> Thanks in advance,</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> Tom </span>
<span style="font-size:11.0pt;font-family:Wingdings">J</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
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