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<p>Hi Christopher!<br>
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<div class="moz-cite-prefix">Am 08.10.2019 um 18:03 schrieb
Christopher Browne:<br>
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cite="mid:CAFNqd5WmBmSx4G6z3_3+EXWuVn=Ui-AG0=0piQQAwUKXh_MSyQ@mail.gmail.com">
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<div dir="ltr">On Tue, 8 Oct 2019 at 03:20, Klaus Darilion <<a
href="mailto:klaus.mailinglists@pernau.at"
moz-do-not-send="true">klaus.mailinglists@pernau.at</a>>
wrote:<br>
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<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">Hello!<br>
<br>
We use Slony 2.1.4, with ~55 global slaves. Susbcribing [1]
a node takes<br>
from ~3minutes (a few milli seconds away) to 15 minutes
(200ms away) -<br>
one some minutes for the initial sync.<br>
<br>
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<blockquote class="gmail_quote" style="margin:0px 0px 0px
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b) Why does it take so long to subscribe? Can I speed up the
subscribe?</blockquote>
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<div>Well, the process involves:</div>
<div>a) Copying all of the data in the replication set, and</div>
<div>b) Regenerating all of the indexes on the tables (as it
is almost always faster to deactivate indexes while doing
the COPY)</div>
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<p>As far as I understand adding a node involves 2 steps:</p>
<p>1. Slony configuration via slonik "subscribe". This configures
the cluster and creates the slony namespace on the slave.</p>
<p>2. Initial sync: COPY the respective tables and sequences from
the master<br>
</p>
<p>The initial sync (2) is actually fast, except there is low
bandwidth to the slave. But the "subscribe" (1) is slow for far
away nodes (in terms of RTT).</p>
<p><br>
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<p>regards</p>
<p>Klaus</p>
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