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https://issues.apache.org/jira/browse/SOLR-13932?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yonik Seeley resolved SOLR-13932.
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Resolution: Fixed
> Review directory locking and Blob interactions
> ----------------------------------------------
>
> Key: SOLR-13932
> URL: https://issues.apache.org/jira/browse/SOLR-13932
> Project: Solr
> Issue Type: Sub-task
> Reporter: Ilan Ginzburg
> Priority: Major
> Time Spent: 3h 10m
> Remaining Estimate: 0h
>
> Review resolution of local index directory content vs Blob copy.
> There has been wrong understanding of following line acquiring a lock on
> index directory.
> {{solrCore.getDirectoryFactory().get(indexDirPath,
> DirectoryFactory.DirContext.DEFAULT,
> solrCore.getSolrConfig().indexConfig.lockType);}}
> From Yonik:
> _A couple things about Directory locking.... the locks were only ever to
> prevent more than one IndexWriter from trying to modify the same index. The
> IndexWriter grabs a write lock once when it is created and does not release
> it until it is closed._
> _Directories are not locked on acquisition of the Directory from the
> DirectoryFactory. See the IndexWriter constructor, where the lock is
> explicitly grabbed._
> Review CorePushPull#pullUpdateFromBlob, ServerSideMetadata and other classes
> as relevant.
>
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