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https://issues.apache.org/jira/browse/HDFS-15207?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17108790#comment-17108790
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Wei-Chiu Chuang commented on HDFS-15207:
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It just occurred to me that certain vendors (e.g. Cloudera) recommends noatime
for DataNodes:
https://docs.cloudera.com/documentation/enterprise/5-6-x/topics/install_cdh_file_system.html
What does this change mean if atime is disabled on the file system?
Regardless, please go ahead with the commit. This is optional so it won't cause
regression even if this is not compatible with noatime setup.
> 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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