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https://issues.apache.org/jira/browse/HDFS-5341?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13802535#comment-13802535
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qus-jiawei commented on HDFS-5341:
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Hi ,Ravi Prakash :
Thanks for review.At the begining, I think isn't necessary to have an junit
test. As the Hadoop QA 's test result,it tells that no tests include.So I add
an useless test in patch 2.
Now , I remove the junit test change and replace tabs with space.
> DirectoryScanner hold the object lock dataset too long in scan,that make the
> datanode turn into deadnode and block all reciving thread
> ---------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-5341
> URL: https://issues.apache.org/jira/browse/HDFS-5341
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Reporter: qus-jiawei
> Assignee: qus-jiawei
> Labels: deadlock
> Fix For: 3.0.0
>
> Attachments: HDFS-5341.000.patch, HDFS-5341.001.patch,
> HDFS-5341.002.patch, HDFS-5341.003.patch, HDFS-5341.004.patch
>
>
> When DirectoryScanner doing the scan function, it holding the dataset to diff
> the block info between memory and disk.But it do a lot of disk operation
> because it call the file's getlength funciton.
> Once the dataset is locked,heartbeat thread and all DataXceiver thread would
> be blocked.
> So,such disk operation should move to the async disk scan
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