Ilan Ginzburg created SOLR-13932:
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Summary: Review directory locking for Blob interactions
Key: SOLR-13932
URL: https://issues.apache.org/jira/browse/SOLR-13932
Project: Solr
Issue Type: Sub-task
Reporter: Ilan Ginzburg
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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