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https://issues.apache.org/jira/browse/SOLR-5679?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shalin Shekhar Mangar resolved SOLR-5679.
-----------------------------------------
Resolution: Fixed
This is fixed.
I'll investigate the auto-upgrade of clusterstate.json separately.
> Shard splitting fails with ClassCastException on clusterstate.json with
> router as string
> ----------------------------------------------------------------------------------------
>
> Key: SOLR-5679
> URL: https://issues.apache.org/jira/browse/SOLR-5679
> Project: Solr
> Issue Type: Bug
> Components: SolrCloud
> Affects Versions: 4.6, 4.6.1
> Reporter: Shalin Shekhar Mangar
> Assignee: Shalin Shekhar Mangar
> Fix For: 4.7
>
>
> SOLR-5246 added support for splitting collections configured with a
> router.field but the fix was not back-compatible.
> After upgrading an old SolrCloud cluster to 4.6 or 4.6.1, shard splitting can
> fail with the following message:
> {quote}
> ERROR o.a.s.handler.admin.CoreAdminHandler - ERROR executing split:
> java.lang.ClassCastException: java.lang.String cannot be cast to java.util.Map
> at
> org.apache.solr.handler.admin.CoreAdminHandler.handleSplitAction(CoreAdminHandler.java:285)
> [solr-core-4.6.1.jar:4.6.1 1560866 - mark - 2014-01-23 20:21:50]
> at
> org.apache.solr.handler.admin.CoreAdminHandler.handleRequestBody(CoreAdminHandler.java:193)
> [solr-core-4.6.1.jar:4.6.1 1560866 - mark - 2014-01-23 20:21:50]
> at
> org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:135)
> [solr-core-4.6.1.jar:4.6.1 1560866 - mark - 2014-01-23 20:21:50]
> {quote}
> This happens because the cluster state still contains the router as a string.
> The clusterstate.json is supposed to auto-upgrade if cluster state is
> upgraded but according to the user report that did not happen. In any case,
> we need to fix the core admin split.
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