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https://issues.apache.org/jira/browse/SOLR-2592?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13534003#comment-13534003
]
Markus Jelsma commented on SOLR-2592:
-------------------------------------
Additional note for anyone: you will also see a similar exception with an older
SolrJ application:
{code}
java.lang.ClassCastException: java.lang.String cannot be cast to java.util.Map
at org.apache.solr.common.cloud.ClusterState.load(ClusterState.java:291)
at org.apache.solr.common.cloud.ClusterState.load(ClusterState.java:263)
at
org.apache.solr.common.cloud.ZkStateReader.createClusterStateWatchersAndUpdate(ZkStateReader.java:274)
at
org.apache.solr.client.solrj.impl.CloudSolrServer.connect(CloudSolrServer.java:142)
at
org.apache.nutch.indexer.solr.SolrUtils.getCloudServer(SolrUtils.java:107)
at
org.apache.nutch.indexer.solr.SolrUtils.getSolrServers(SolrUtils.java:65)
at org.apache.nutch.indexer.solr.SolrWriter.open(SolrWriter.java:65)
at
org.apache.nutch.indexer.IndexerOutputFormat.getRecordWriter(IndexerOutputFormat.java:42)
at
org.apache.hadoop.mapred.ReduceTask$OldTrackingRecordWriter.<init>(ReduceTask.java:448)
at
org.apache.hadoop.mapred.ReduceTask.runOldReducer(ReduceTask.java:490)
at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:420)
at
org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:260)
{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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