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https://issues.apache.org/jira/browse/SOLR-4709?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13633765#comment-13633765
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Mark Miller commented on SOLR-4709:
-----------------------------------

{code}
    if (!getNewIndexDir().equals(getIndexDir())) {
      // the directory is changing, don't pass on state
      prev = null;
    }
{code}

This means that if we reopen and the index directory has changed, don't pass on 
previous core state - open the core as if it was first starting up. There 
should not be a problem getting a lock in that case - this should only happen 
when reopening on a *new* index.

I'll spend some time investigating soon.
                
> dir lock error if reopening cores to fast?
> ------------------------------------------
>
>                 Key: SOLR-4709
>                 URL: https://issues.apache.org/jira/browse/SOLR-4709
>             Project: Solr
>          Issue Type: Bug
>            Reporter: Hoss Man
>            Assignee: Mark Miller
>             Fix For: 4.3, 5.0
>
>
> While testing my patch for SOLR-4629, i noticed a really random error that i 
> traced back to the core reload (do to config file replication) failed because 
> the directory was locked.
> From what i can tell, the lock checking code in the SolrCore constructor 
> isn't even suppose to be used in the reload situation where there is a "prev" 
> core, except that in SolrCore.reload there is this check...
> {noformat}
>     if (!getNewIndexDir().equals(getIndexDir())) {
>       // the directory is changing, don't pass on state
>       prev = null;
>     }
> {noformat}
> ..i'm not really sure i understand this logic, or what exactly the source of 
> the problem is, or if the lock checking code should just be changed to work a 
> differnet way completley, but it seemed worthy of tracking in it's own jira.
> log details to follow

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