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https://issues.apache.org/jira/browse/HDFS-10958?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15742533#comment-15742533
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Xiaoyu Yao commented on HDFS-10958:
-----------------------------------

Thanks [~arpitagarwal] for updating the patch. I'll review the latest patch 
today. 

The following three unit test failures are tracked by HADOOP-13980. 
{code}
hadoop.security.token.delegation.web.TestWebDelegationToken
hadoop.hdfs.TestSecureEncryptionZoneWithKMS
hadoop.hdfs.TestTrashWithSecureEncryptionZones
{code}

Can you confirm if the following unit test failure is related to this patch or 
not?
{code}
hadoop.hdfs.TestDFSClientRetries
{code}

> Add instrumentation hooks around Datanode disk IO
> -------------------------------------------------
>
>                 Key: HDFS-10958
>                 URL: https://issues.apache.org/jira/browse/HDFS-10958
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>            Reporter: Xiaoyu Yao
>            Assignee: Arpit Agarwal
>         Attachments: HDFS-10958.01.patch, HDFS-10958.02.patch, 
> HDFS-10958.03.patch, HDFS-10958.04.patch
>
>
> This ticket is opened to add instrumentation hooks around Datanode disk IO 
> based on refactor work from HDFS-10930.



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