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https://issues.apache.org/jira/browse/SOLR-12845?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16661325#comment-16661325
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Varun Thacker commented on SOLR-12845:
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I can think of two more defaults ( both should be strict:false ) that we could
add to the autoscaling.json file :
* Don't have more than two replicas on the same physical host : {{{"replica":
"<2", "host": “#ANY”}}}
* Define a well known system property called "rack" in Solr ( SOLR-12907 ) -
{{{"replica": "#EQUAL", "shard": "#EACH", "rack": “#EACH”}}}
> Add a default cluster policy
> ----------------------------
>
> Key: SOLR-12845
> URL: https://issues.apache.org/jira/browse/SOLR-12845
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Shalin Shekhar Mangar
> Priority: Major
> Attachments: SOLR-12845.patch
>
>
> [~varunthacker] commented on SOLR-12739:
> bq. We should also ship with some default policies - "Don't allow more than
> one replica of a shard on the same JVM" , "Distribute cores across the
> cluster evenly" , "Distribute replicas per collection across the nodes"
> This issue is about adding these defaults. I propose the following as default
> cluster policy:
> {code}
> # Each shard cannot have more than one replica on the same node if possible
> {"replica": "<2", "shard": "#EACH", "node": "#ANY", "strict":false}
> # Each collections replicas should be equally distributed amongst nodes
> {"replica": "#EQUAL", "node": "#ANY", "strict":false}
> # All cores should be equally distributed amongst nodes
> {"cores": "#EQUAL", "node": "#ANY", "strict":false}
> {code}
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