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https://issues.apache.org/jira/browse/CASSANDRA-17792?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17578642#comment-17578642
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Yifan Cai commented on CASSANDRA-17792:
---------------------------------------

Starting commit

CI Results (pending):
||Branch||Source||Circle CI||
|cassandra-4.0|[branch|https://github.com/yifan-c/cassandra/tree/commit_remote_branch/CASSANDRA-17792-cassandra-4.0-B379A7D7-6E64-466B-BF81-7D8654F4110C]|[build|https://app.circleci.com/pipelines/github/yifan-c/cassandra?branch=commit_remote_branch%2FCASSANDRA-17792-cassandra-4.0-B379A7D7-6E64-466B-BF81-7D8654F4110C]|
|cassandra-4.1|[branch|https://github.com/yifan-c/cassandra/tree/commit_remote_branch/CASSANDRA-17792-cassandra-4.1-B379A7D7-6E64-466B-BF81-7D8654F4110C]|[build|https://app.circleci.com/pipelines/github/yifan-c/cassandra?branch=commit_remote_branch%2FCASSANDRA-17792-cassandra-4.1-B379A7D7-6E64-466B-BF81-7D8654F4110C]|
|trunk|[branch|https://github.com/yifan-c/cassandra/tree/commit_remote_branch/CASSANDRA-17792-trunk-B379A7D7-6E64-466B-BF81-7D8654F4110C]|[build|https://app.circleci.com/pipelines/github/yifan-c/cassandra?branch=commit_remote_branch%2FCASSANDRA-17792-trunk-B379A7D7-6E64-466B-BF81-7D8654F4110C]|


> Fix race condition on updating cdc size and advancing to next segment
> ---------------------------------------------------------------------
>
>                 Key: CASSANDRA-17792
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-17792
>             Project: Cassandra
>          Issue Type: Bug
>          Components: CI
>            Reporter: Ekaterina Dimitrova
>            Assignee: Yifan Cai
>            Priority: Normal
>             Fix For: 4.x
>
>          Time Spent: 1h 20m
>  Remaining Estimate: 0h
>
> org.apache.cassandra.distributed.test.cdc.ToggleCDCOnRepairEnabledTest is a 
> bit flaky on [trunk. 
> As [this 
> run|https://app.circleci.com/pipelines/github/ekaterinadimitrova2/cassandra?branch=17666]
>  shows it was flaky since it was introduced a month ago as part of
> CASSANDRA-17666 but the flakiness is so low that if we don't run it in a loop 
> it is hard to hit it. 
> Both tests in the test class can fail with the same exception:
> {code:java}
> org.apache.cassandra.distributed.shared.ShutdownException: Uncaught 
> exceptions were thrown during test at 
> org.apache.cassandra.distributed.impl.AbstractCluster.checkAndResetUncaughtExceptions(AbstractCluster.java:1056)
>  at 
> org.apache.cassandra.distributed.impl.AbstractCluster.close(AbstractCluster.java:1042)
>  at 
> org.apache.cassandra.distributed.test.cdc.ToggleCDCOnRepairEnabledTest.testCDCOnRepairEnabled(ToggleCDCOnRepairEnabledTest.java:95)
>  at 
> org.apache.cassandra.distributed.test.cdc.ToggleCDCOnRepairEnabledTest.testCDCOnRepairIsEnabled(ToggleCDCOnRepairEnabledTest.java:40)
>  at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native 
> Method) at 
> java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
>  at 
> java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>  Suppressed: java.lang.NullPointerException at 
> org.apache.cassandra.db.commitlog.CommitLogSegmentManagerCDC$CDCSizeTracker.recalculateOverflowSize(CommitLogSegmentManagerCDC.java:390)
>  at org.apache.cassandra.concurrent.FutureTask$1.call(FutureTask.java:81) at 
> org.apache.cassandra.concurrent.FutureTask.call(FutureTask.java:47) at 
> org.apache.cassandra.concurrent.FutureTask.run(FutureTask.java:57) at 
> java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
>  at 
> java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
>  at 
> io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
>  at java.base/java.lang.Thread.run(Thread.java:829){code}
> CC [~ycai] , [~jmckenzie] 



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