[jira] [Commented] (SOLR-5715) CloudSolrServer should choose URLs that match _route_

["Chase Bradford (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-5715?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13940767#comment-13940767 ] 

Chase Bradford commented on SOLR-5715:
--------------------------------------

I don't see how this uses the route parameter.  The list of slices that the LB server can query is still all active slices for the collection, and not just those that match the route.

+        DocCollection coll = clusterState.getCollection(collectionsList.iterator().next());
+        Collection<Slice> filteredSlices = coll.getRouter().getSearchSlices(route, reqParams , coll);
+        ClientUtils.addSlices(slices, coll.getName(), filteredSlices, true);

> CloudSolrServer should choose URLs that match _route_
> -----------------------------------------------------
>
>                 Key: SOLR-5715
>                 URL: https://issues.apache.org/jira/browse/SOLR-5715
>             Project: Solr
>          Issue Type: Improvement
>          Components: clients - java
>    Affects Versions: 4.6.1
>            Reporter: Chase Bradford
>            Assignee: Noble Paul
>            Priority: Minor
>             Fix For: 4.8, 5.0
>
>         Attachments: SOLR-5715.patch
>
>
> When using CloudSolrServer to issue a request with a _route_ param, the URLs passed to LBHttpSolrServer should be filtered to include only hosts serving a slice.  If there's a single shard listed, then the query can be served directly.  Otherwise, the cluster services 3 /select requests for the query.  As the host to replica ratio increases the probability of needing an extra hop goes to one, putting unnecessary strain on the cluster's network.



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