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https://issues.apache.org/jira/browse/HDFS-12463?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16169770#comment-16169770
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Yiqun Lin commented on HDFS-12463:
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Hi [~cheersyang], I think you raised up a good point. I have addressed your 
comment in HDFS-12268 and attached a new patch there. Since HDFS-12268 was 
reopened, I'd like to close this JIRA. Thanks.

> Ozone: Fix TestXceiverClientMetrics#testMetrics 
> ------------------------------------------------
>
>                 Key: HDFS-12463
>                 URL: https://issues.apache.org/jira/browse/HDFS-12463
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ozone
>    Affects Versions: HDFS-7240
>            Reporter: Weiwei Yang
>            Assignee: Yiqun Lin
>            Priority: Minor
>         Attachments: HDFS-12463-HDFS-7240.001.patch
>
>
> {{TestXceiverClientMetrics#testMetrics}} is failing with following error in 
> recent jenkins job,
> {noformat}
> java.util.ConcurrentModificationException: null
>       at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
>       at java.util.ArrayList$Itr.next(ArrayList.java:851)
>       at 
> org.apache.hadoop.ozone.scm.TestXceiverClientMetrics.lambda$testMetrics$2(TestXceiverClientMetrics.java:134)
> {noformat}
> looks like a non thread safe list caused this race condition in the test case.



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