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https://issues.apache.org/jira/browse/SOLR-9405?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Smiley updated SOLR-9405:
-------------------------------
Attachment: SOLR_9405_no_compute.patch
Not sure if it's related to this issue, but when I beast test
TestCollectionStateWatchers, I get "ZkTestServer Watch limit violations".
{{ant beast -Dtestcase=TestCollectionStateWatchers -Dbeast.iters=100}} It only
took a few minutes.
Separately from that, I find the use of {{ConcurrentHashMap.compute()}} in this
class very odd... definitely not the intended purpose of this method -- even
the return value isn't used. I think it's a nifty method/feature, it's just
that I don't see why ZkTestServer is calling it the way it's calling it versus
simply calling {{get()}}. Attached is a patch showing something simpler. My
beast test failed _with and without_ this patch.
> 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: Shalin Shekhar Mangar
> Fix For: 6.2, master (7.0)
>
> Attachments: SOLR-9405.patch, SOLR-9405.patch,
> SOLR_9405_no_compute.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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