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https://issues.apache.org/jira/browse/SOLR-9405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15417371#comment-15417371
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Shalin Shekhar Mangar commented on SOLR-9405:
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Thanks Alan. I am not sure how CollectionWatch#stateWatchers is thread-safe. Is
it because all access to it is inside of ConcurrentHashMap#compute? The
javadocs for compute only say that the entire method invocation is performed
atomically. That doesn't necessarily mean that it is synchronized.
What about access to the size() method? We access it independently in the
canBeRemoved() method. Is that likely to cause a problem?
> ConcurrentModificationException in ZkStateReader.getStateWatchers
> -----------------------------------------------------------------
>
> Key: SOLR-9405
> URL: https://issues.apache.org/jira/browse/SOLR-9405
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: SolrCloud
> Affects Versions: 6.1
> Reporter: Shalin Shekhar Mangar
> Assignee: Alan Woodward
> Fix For: 6.2, master (7.0)
>
> Attachments: SOLR-9405.patch
>
>
> Jenkins found this: http://jenkins.thetaphi.de/job/Lucene-Solr-6.x-Linux/1432/
> {code}
> Stack Trace:
> java.util.ConcurrentModificationException
> at
> __randomizedtesting.SeedInfo.seed([FA459DF725097EFF:A77E52876204E1C1]:0)
> at
> java.util.HashMap$HashIterator.nextNode(java.base@9-ea/HashMap.java:1489)
> at
> java.util.HashMap$KeyIterator.next(java.base@9-ea/HashMap.java:1513)
> at
> java.util.AbstractCollection.addAll(java.base@9-ea/AbstractCollection.java:351)
> at java.util.HashSet.<init>(java.base@9-ea/HashSet.java:119)
> at
> org.apache.solr.common.cloud.ZkStateReader.getStateWatchers(ZkStateReader.java:1279)
> at
> org.apache.solr.common.cloud.TestCollectionStateWatchers.testSimpleCollectionWatch(TestCollectionStateWatchers.java:116)
> {code}
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