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https://issues.apache.org/jira/browse/SOLR-5501?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13909726#comment-13909726
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Manuel Lenormand commented on SOLR-5501:
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clusterstate would look like
{code:javascript}
{"collection1":{
"shards":{
"shard1":{
"range":"00000000-ffffffff",
"state":"active",
"replicas":{
"core_node1":{
"state":"active",
"roles":"hot_replica",
"base_url":"http://127.0.0.1:8983/solr";,
"core":"collection1",
"node_name":"127.0.0.1:8983_solr"},
"core_node2":{
"state":"active",
"roles":"cold_replica",
"base_url":"http://10.0.0.4:8983/solr";,
"core":"collection1",
"node_name":"10.0.0.4:8983_solr",
"leader":"true"}}}}}
{code}
and the API would be:
solr/admin/collections?action=SETCOLDREPLICA&collection=collection1&shard=shard1&replica=core_node1
solr/admin/collections?action=SETHOTREPLICA&collection=collection1&shard=shard1&replica=core_node1
> 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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