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https://issues.apache.org/jira/browse/HDFS-11045?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15637188#comment-15637188
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Xiao Chen commented on HDFS-11045:
----------------------------------

Thanks [~templedf] for the continued effort on this!! The patch is getting big. 
:)

A couple of comments:
- the modified {{DirectoryScanner#accumulateTimeRunning}} makes sense to me. 
But found it a bit confusing at first glance. Suggest to add some comments to 
make it easier to read.
- testThrottling could use extract the retries loop into a new function
- maybe +- 10% itself is too restrictive? How do you feel about changing that 
to +-20% (i.e. min=0.8, max=1.2)?
- Didn't understand this comment in test:
{code}
      // The scanner should sleep 500ms out of every 1sec. If we've slept at
      // least 200ms, we've run for at least 1600ms.
{code}

> TestDirectoryScanner#testThrottling fails: Throttle is too permissive
> ---------------------------------------------------------------------
>
>                 Key: HDFS-11045
>                 URL: https://issues.apache.org/jira/browse/HDFS-11045
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode
>    Affects Versions: 3.0.0-alpha2
>            Reporter: John Zhuge
>            Assignee: Daniel Templeton
>            Priority: Minor
>         Attachments: HDFS-11045.001.patch, HDFS-11045.002.patch, 
> HDFS-11045.003.patch, HDFS-11045.004.patch, HDFS-11045.005.patch, 
> HDFS-11045.006.patch, HDFS-11045.007.patch, HDFS-11045.008.patch
>
>
>   TestDirectoryScanner.testThrottling:709 Throttle is too permissive
> https://builds.apache.org/job/PreCommit-HDFS-Build/17259/artifact/patchprocess/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt



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