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Posted to issues@lucene.apache.org by "Ilan Ginzburg (Jira)" <ji...@apache.org> on 2019/11/24 21:57:00 UTC
[jira] [Updated] (SOLR-13932) Review directory locking and Blob
interactions
[ https://issues.apache.org/jira/browse/SOLR-13932?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Ilan Ginzburg updated SOLR-13932:
---------------------------------
Summary: Review directory locking and Blob interactions (was: Review directory locking for Blob interactions)
> 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
>
> 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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