[jira] [Resolved] (SOLR-6504) Switching exploded war from version 4.10 caused Solr to be unable to start

["Cassandra Targett (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-6504?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Cassandra Targett resolved SOLR-6504.
-------------------------------------
    Resolution: Won't Fix

I'm not sure we're going to fix this - it seems a pretty unique use case (switching installs back & forth to upgrade and resolve issues with the upgrade) - and since no one has looked at it yet, it seems unlikely we will.

If I'm wrong on this assessment, please reopen.

> Switching exploded war from version 4.10 caused Solr to be unable to start
> --------------------------------------------------------------------------
>
>                 Key: SOLR-6504
>                 URL: https://issues.apache.org/jira/browse/SOLR-6504
>             Project: Solr
>          Issue Type: Bug
>            Reporter: Brian
>            Assignee: Timothy Potter
>            Priority: Minor
>
> I tried upgrading to Solr 4.10 from Solr 4.8.1 by switching the server to use the new Solr 4.10 web application folder (exploded war) - simply by renaming the folder from "solr_4_10" to "solr" (and the previous "solr" to "solr_old"), then restarting the server.
> This worked fine, but there was an incompatibility forcing me to switch back to 4.8.1, which I did by renaming the folders again, "solr_old" back to "solr" and restarting the server.  
> However on restart, none of the cores could load, giving the following error:
>     org.apache.solr.common.SolrException:org.apache.solr.common.SolrException: java.util.ArrayList cannot be cast to java.util.Map
> By searching I found the previous issue (linked to below), and found this was the same problem - "_rest_managed.json" files were being created, and once I deleted them that particular error message went away and most cores could be loaded.
> I.e., this appears to be the same issue as:
> https://issues.apache.org/jira/browse/SOLR-6182
>  
> except it is caused by a different process.  Either that issue wasn't really resolved, or this is a different problem with the same symptoms.



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