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https://issues.apache.org/jira/browse/SOLR-5748?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13907201#comment-13907201
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Mark Miller commented on SOLR-5748:
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Explain your reasoning. If someone decreases the replicationFactor, that's
obviously exactly what they want.
> 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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