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From "Suresh Pendap (Confluence)" <conflue...@apache.org>
Subject [CONF] Apache Solr Reference Guide > Rule-based Replica Placement
Date Thu, 04 May 2017 17:05:45 GMT
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exactly"><a href="https://cwiki.apache.org/confluence/display/solr/Rule-based+Replica+Placement?focusedCommentId=69409151&amp;src=mail&amp;src.mail.timestamp=1493917545043&amp;src.mail.notification=com.atlassian.confluence.plugins.confluence-content-notifications-plugin%3Acomment-created-notification&amp;src.mail.recipient=8aa980874e36a1eb014e36a2992a202c&amp;src.mail.action=view#comment-69409151"
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title="Re: Rule-based Replica Placement" style="color: #3b73af; text-decoration: none">Re:
Rule-based Replica Placement</a></span></td> 
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<td class="content-excerpt-pattern-container mobile-resize-text " style="padding: 0px;
border-collapse: collapse; padding: 0 0 0 24px"> <p style="margin: 10px 0 0 0; margin-top:
0">If I would like to configure a rule to make sure that for every shard at-least one replica
is assigned to each rack before more than one replicas are assigned to the same rack, how
would that rule look like?&nbsp;</p> <p style="margin: 10px 0 0 0">For e.g
if I have a collection with 2 shards and replication-factor: 2 and I have 3 racks say rack1,
rack2, rack3, I want to make sure that at-least one replica is assigned to each rack.<br>So
the replicas in this case should be assigned as shard1_replica1: rack1, shard1_replica2:rack2,
shard2_replica1:rack3 and shard2_replica2:&lt;one of the 3 racks&gt;<br>It should
not assign the replicas as shard1_replica1:rack1, shard1_replica2:rack2, shard2_replica1:
rack1, shard2_replica2: rack2. In this case more than one replicas are assigned to the racks
rack1 and rack2 and no replicas are assigned to rack3. This is not ideal and not good for
HA</p> </td> 
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