[ 
https://issues.apache.org/jira/browse/SOLR-2592?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13532219#comment-13532219
 ] 

Markus Jelsma edited comment on SOLR-2592 at 12/14/12 10:46 AM:
----------------------------------------------------------------

I think this belong to this issue. We're seeing with today's trunk and a clean 
Zookeeper the following exception. For some reason, only one node exhibits this 
behavior.

{code}
2012-12-14 10:10:27,355 ERROR [apache.zookeeper.ClientCnxn] - 
[main-EventThread] - : Error while calling watcher 
java.lang.ClassCastException: java.lang.String cannot be cast to java.util.Map
        at 
org.apache.solr.common.cloud.ClusterState.makeSlices(ClusterState.java:246)
        at 
org.apache.solr.common.cloud.ClusterState.collectionFromObjects(ClusterState.java:231)
        at org.apache.solr.common.cloud.ClusterState.load(ClusterState.java:219)
        at 
org.apache.solr.common.cloud.ZkStateReader$2.process(ZkStateReader.java:207)
        at 
org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:519)
        at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:495)
{code}

Restarting the entire cluster and cleaning ZK does not help. This single node 
remains stuborn and cannot get up. It also simply stops logging anything after 
including the regular ping requests.
                
      was (Author: markus17):
    I think this belong to this issue. We're seeing with today's trunk and a 
clean Zookeeper the following exception. For some reason, only one node 
exhibits this behavior.

{code}
2012-12-14 10:10:27,355 ERROR [apache.zookeeper.ClientCnxn] - 
[main-EventThread] - : Error while calling watcher 
java.lang.ClassCastException: java.lang.String cannot be cast to java.util.Map
        at 
org.apache.solr.common.cloud.ClusterState.makeSlices(ClusterState.java:246)
        at 
org.apache.solr.common.cloud.ClusterState.collectionFromObjects(ClusterState.java:231)
        at org.apache.solr.common.cloud.ClusterState.load(ClusterState.java:219)
        at 
org.apache.solr.common.cloud.ZkStateReader$2.process(ZkStateReader.java:207)
        at 
org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:519)
        at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:495)
{code}
                  
> Custom Hashing
> --------------
>
>                 Key: SOLR-2592
>                 URL: https://issues.apache.org/jira/browse/SOLR-2592
>             Project: Solr
>          Issue Type: New Feature
>          Components: SolrCloud
>    Affects Versions: 4.0-ALPHA
>            Reporter: Noble Paul
>            Assignee: Yonik Seeley
>             Fix For: 4.1
>
>         Attachments: dbq_fix.patch, pluggable_sharding.patch, 
> pluggable_sharding_V2.patch, SOLR-2592_collectionProperties.patch, 
> SOLR-2592_collectionProperties.patch, SOLR-2592.patch, 
> SOLR-2592_progress.patch, SOLR-2592_query_try1.patch, 
> SOLR-2592_r1373086.patch, SOLR-2592_r1384367.patch, SOLR-2592_rev_2.patch, 
> SOLR_2592_solr_4_0_0_BETA_ShardPartitioner.patch
>
>
> If the data in a cloud can be partitioned on some criteria (say range, hash, 
> attribute value etc) It will be easy to narrow down the search to a smaller 
> subset of shards and in effect can achieve more efficient search.  

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