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https://issues.apache.org/jira/browse/HDFS-15676?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17240554#comment-17240554
 ] 

Masatake Iwasaki commented on HDFS-15676:
-----------------------------------------

The test fails only if I run both testNamenodeMetrics and 
testGetCachedDatanodeReport. Running 
{{-Dtest=testNamenodeMetrics#testNamenodeMetrics}} alone has no issue. Since 
the TestRouterRpcMultiDestination reuses a mini cluster in the test cases, 
{{testNamenodeMetrics}} could be fixed by addressing 
{{testGetCachedDatanodeReport}} issue.

{noformat}
$ for i in `seq 100` ; do echo $i && mvn test -DignoreTestFailure=false 
-Dtest=TestRouterRpcMultiDestination#testNamenodeMetrics,TestRouterRpcMultiDestination#testGetCachedDatanodeReport
  || break ; done
...
[ERROR] Failures:
[ERROR]   TestRouterRpcMultiDestination>TestRouterRpc.testNamenodeMetrics:1682 
expected:<12> but was:<11>
[ERROR] Errors:
[ERROR]   
TestRouterRpcMultiDestination>TestRouterRpc.testGetCachedDatanodeReport:1829 ยป 
Timeout
[INFO]
[ERROR] Tests run: 2, Failures: 1, Errors: 1, Skipped: 0
{noformat}


> TestRouterRpcMultiDestination#testNamenodeMetrics fails on trunk
> ----------------------------------------------------------------
>
>                 Key: HDFS-15676
>                 URL: https://issues.apache.org/jira/browse/HDFS-15676
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Ahmed Hussein
>            Assignee: Masatake Iwasaki
>            Priority: Major
>
> qbt report (Nov 8, 2020, 11:28 AM) shows failures in testNamenodeMetrics



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