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https://issues.apache.org/jira/browse/CASSANDRA-15575?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17041985#comment-17041985
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Brandon Williams commented on CASSANDRA-15575:
----------------------------------------------
There can be a thread returned in getAllThreadIds that dies before
getThreadInfo is called on it, resulting in the NPE. The simplest thing to do
is just filter out nulls here, and the good news is this condition very rarely
occurs, so whatever thread it is that is dying before we get its info, is safe
as far as the test is concerned. Patch to filter nulls here:
https://github.com/driftx/cassandra/tree/CASSANDRA-15575
> Fix flaky test
> org.apache.cassandra.tools.StandaloneVerifierTest.testStandaloneVerifier_WithArgs
> ------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-15575
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15575
> Project: Cassandra
> Issue Type: Bug
> Components: Test/unit, Tool/sstable
> Reporter: David Capwell
> Assignee: Brandon Williams
> Priority: Normal
> Fix For: 4.0-alpha
>
>
> Failure was seen on java 8.
> {code}
> java.lang.NullPointerException
> at
> java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
> at
> java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948)
> at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482)
> at
> java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472)
> at
> java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
> at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
> at
> java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:566)
> at
> org.apache.cassandra.tools.ToolsTester.assertNoUnexpectedThreadsStarted(ToolsTester.java:86)
> at
> org.apache.cassandra.tools.StandaloneVerifierTest.testStandaloneVerifier_WithArgs(StandaloneVerifierTest.java:45)
> {code}
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