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https://issues.apache.org/jira/browse/HDFS-15207?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17108842#comment-17108842
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Yang Yun commented on HDFS-15207:
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if the atime is disabled, the atime will never change and keep the initial
value. this feature will not work even it's enabled.
> VolumeScanner skip to scan blocks accessed during recent scan peroid
> --------------------------------------------------------------------
>
> Key: HDFS-15207
> URL: https://issues.apache.org/jira/browse/HDFS-15207
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Reporter: Yang Yun
> Assignee: Yang Yun
> Priority: Minor
> Attachments: HDFS-15207.002.patch, HDFS-15207.003.patch,
> HDFS-15207.004.patch, HDFS-15207.005.patch, HDFS-15207.006.patch,
> HDFS-15207.patch, HDFS-15207.patch
>
>
> Check the access time of block file to avoid scanning recently changed
> blocks, reducing disk IO.
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