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https://issues.apache.org/jira/browse/SOLR-5501?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13930414#comment-13930414
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Manuel Lenormand commented on SOLR-5501:
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Cold-replicas nodes should not be permanent. They should be configurable in
dependence to performance / cloud architecture, ie on replica basis.
I want to set hot/cold roles to existing replicas, but we can also support this
setting on ADDREPLICA call. Anyway I'd favor MODIFYCOLLECTION to support this.
Do we want to explicitly configure all replicas as hot_replicas from now on, or
will it be implicit unless they are configured as cold_replicas?
In case the hot/cold replica feature would integrate to SOLR-5132, it leaves to
this Jira only a change in HttpShardHandlerFactory.makeURLList:239 that
currently shuffles the replicas instead of favoring the hot replicas..
> Ability to work with cold replicas
> ----------------------------------
>
> Key: SOLR-5501
> URL: https://issues.apache.org/jira/browse/SOLR-5501
> Project: Solr
> Issue Type: Improvement
> Components: SolrCloud
> Affects Versions: 4.5.1
> Reporter: Manuel Lenormand
> Labels: performance
> Fix For: 4.7
>
>
> Following this conversation from the mailing list:
> http://lucene.472066.n3.nabble.com/Proposal-for-new-feature-cold-replicas-brainstorming-td4097501.html
> Should give the ability to use replicas mainly as backup cores and not for
> handling high qps rate.
> This way you would avoid using the caching ressources (solr and OS) used when
> routing a query to a replica.
> With many replicas it's harder hitting the solr cache (same query may hit
> another replica) and having many replicas on the same instance would cause a
> useless competition on the OS memory for caching.
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