[ 
https://issues.apache.org/jira/browse/SOLR-4221?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13777407#comment-13777407
 ] 

Markus Jelsma commented on SOLR-4221:
-------------------------------------

Ah, i come from SOLR-5261 and noticed the discussion here so i'll comment here 
as well. The stack trace i posted earlier is gone now and is replaced by the 
trace below. This only happens if a new SolrJ attempts to talk to a slightly 
older cluster.

{code}
java.lang.ClassCastException: java.lang.String cannot be cast to java.util.Map
        at 
org.apache.solr.common.cloud.DocRouter.getRouteField(DocRouter.java:54)
        at 
org.apache.solr.common.cloud.CompositeIdRouter.sliceHash(CompositeIdRouter.java:64)
        at 
org.apache.solr.common.cloud.HashBasedRouter.getTargetSlice(HashBasedRouter.java:33)
        at 
org.apache.solr.client.solrj.request.UpdateRequest.getRoutes(UpdateRequest.java:190)
        at 
org.apache.solr.client.solrj.impl.CloudSolrServer.directUpdate(CloudSolrServer.java:313)
        at 
org.apache.solr.client.solrj.impl.CloudSolrServer.request(CloudSolrServer.java:506)
        at 
org.apache.solr.client.solrj.request.AbstractUpdateRequest.process(AbstractUpdateRequest.java:117)
{code}

                
> Custom sharding
> ---------------
>
>                 Key: SOLR-4221
>                 URL: https://issues.apache.org/jira/browse/SOLR-4221
>             Project: Solr
>          Issue Type: New Feature
>            Reporter: Yonik Seeley
>            Assignee: Noble Paul
>             Fix For: 4.5, 5.0
>
>         Attachments: SOLR-4221.patch, SOLR-4221.patch, SOLR-4221.patch, 
> SOLR-4221.patch, SOLR-4221.patch, SOLR-4221.patch, SOLR-4221.patch, 
> SOLR-4221.patch
>
>
> Features to let users control everything about sharding/routing.

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