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https://issues.apache.org/jira/browse/HDFS-15822?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17280727#comment-17280727
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tianhang tang commented on HDFS-15822:
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Failed tests don't seem to be related to the patch, and all of them passed on
my local:
TestReconstructStripedFile#testNNSendsErasureCodingTasks
TestRollingUpgrade#testCheckpointWithMultipleNN
TestRollingUpgrade#testDFSAdminRollingUpgradeCommands
TestRollingUpgrade#testRollBackImage
TestRollingUpgrade#testRollback
TestThrottledAsyncCheckerTimeout#testTimeoutExceptionIsNotThrownForGoodDisk
> Client retry mechanism may invalid when use hedgedRead
> ------------------------------------------------------
>
> Key: HDFS-15822
> URL: https://issues.apache.org/jira/browse/HDFS-15822
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs-client
> Reporter: tianhang tang
> Assignee: tianhang tang
> Priority: Major
> Attachments: HDFS-15822.001.patch
>
>
> Hedgedread uses ignoreNodes to ensure that multiple requests fall on
> different nodes. But the ignoreNodes never been cleared. So if the request of
> 1st round all failed, and the refetched location is not changed, HDFS client
> would not request the same nodes which are in the ignoreNodes. It just sleep
> time by time until reach the retry num, then throw a exception.
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