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https://issues.apache.org/jira/browse/SOLR-17396?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17872095#comment-17872095
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ASF subversion and git services commented on SOLR-17396:
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Commit 49b24d532e777a1e8e79efa5b3b59773d8867ea4 in solr's branch
refs/heads/main from David Smiley
[ https://gitbox.apache.org/repos/asf?p=solr.git;h=49b24d532e7 ]
SOLR-17396: fix CHANGES.txt
> 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
> 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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