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https://issues.apache.org/jira/browse/SOLR-5748?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13917358#comment-13917358
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Ramkumar Aiyengar commented on SOLR-5748:
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How do you plan to locate the replicas? It would be good to have some kind of
control over where the additional replicas will be so that the installation
could decide that based on the disk space, memory availability etc.
> Introduce autoManageReplicas collection property
> ------------------------------------------------
>
> Key: SOLR-5748
> URL: https://issues.apache.org/jira/browse/SOLR-5748
> Project: Solr
> Issue Type: Sub-task
> Components: SolrCloud
> Reporter: Shalin Shekhar Mangar
> Fix For: 5.0
>
>
> I propose to introduce a collection property called autoManageReplicas. This
> will be used only with the ZK as truth mode.
> If set to true, then whenever the number of replicas for a shard fall below
> the replicationFactor and the down nodes do not come back up for a
> configurable amount of time, additional replicas will be started up
> automatically. Similarly, if the actual number of replicas is equal to or
> greater than replicationFactor then if old (previously down) nodes come back
> up then they will not be allowed to join the shard and will be unloaded
> instead.
> I think we should not unload running shards if number of replicas are more
> for now. We can change that later if needed.
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