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https://issues.apache.org/jira/browse/SOLR-17396?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Smiley resolved SOLR-17396.
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Fix Version/s: 9.8
Resolution: Fixed
Thanks Aparna & Paul!
> Reduce thread contention in ZkStateReader.getCollectionProperties()
> -------------------------------------------------------------------
>
> Key: SOLR-17396
> URL: https://issues.apache.org/jira/browse/SOLR-17396
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Aparna Suresh
> Priority: Minor
> Labels: pull-request-available
> Fix For: 9.8
>
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> Building on
> [https://github.com/apache/solr/pull/2585|PR|https://github.com/apache/solr/pull/2585%7CPR]
> which delegated Collection Properties Management to
> {{{}CollectionPropertiesZkStateReader{}}}, this PR seeks to minimize thread
> contention within {{{}CollectionPropertiesZkStateReader{}}}.
> Proposal:
> * Use collection level locking where relevant instead of synchronizing on
> "watchedCollectionProperties"
> * With the double checked locking implemented in
> CollectionPropertiesZkStateReader, the scope of the synchronized (this) will
> be reduced to collection property operations, and no longer be in contention
> with the synchronization of unrelated operations on ZkStateReader.
>
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