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https://issues.apache.org/jira/browse/SOLR-17895?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18133299#comment-18133299
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ASF subversion and git services commented on SOLR-17895:
--------------------------------------------------------
Commit 6518c15fbb5e372cf0e636b331699eb67248e833 in solr's branch
refs/heads/branch_10x from sarkaramrit1993
[ https://gitbox.apache.org/repos/asf?p=solr.git;h=6518c15fbb5 ]
SOLR-17895: When Overseer is disabled: Remove unused lock nodes (#5161)
by using modern Zookeeper "container znodes"
(cherry picked from commit 0d48fb5b1afdc985f1577576d32deb3d649a418e)
> Persistent ZNodes are leaked when running Solr Cloud with distributed
> collection commands
> -----------------------------------------------------------------------------------------
>
> Key: SOLR-17895
> URL: https://issues.apache.org/jira/browse/SOLR-17895
> Project: Solr
> Issue Type: Bug
> Components: SolrCloud
> Affects Versions: 9.0, 10.0
> Reporter: Paul McArthur
> Priority: Minor
> Labels: pull-request-available
> Time Spent: 2h 20m
> Remaining Estimate: 0h
>
> When a collection command is executed in distributed mode
> (DistributedCollectionCommandRunner), an ephemeral ZNode is created to lock
> the collection, shard or replica that prevents other commands from executing
> concurrently and potentially conflicting with each other.
>
> The ephemeral nodes are created in a tree structure under
> {_}*distributedapi/collectionlocks*{_}, with persistent znodes created for
> collName
> collName/Locks
> collName/_shard
> collName/_shard/Locks
> collName/_shard/_replica
>
> These nodes are never deleted from ZooKeeper, even when the collection is
> deleted, and can therefore accrue over time.
> In our specific case, we have accumulated many thousands of these nodes over
> a few months. While there appears to be no direct impact on performance,
> these nodes should nonetheless be removed when they are no longer required.
>
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