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https://issues.apache.org/jira/browse/SOLR-4709?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13829042#comment-13829042
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Mark Miller commented on SOLR-4709:
-----------------------------------
Missed the comment on the merge back - in 4x as well.
> 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: 5.0, 4.7
>
>
> 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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