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https://issues.apache.org/jira/browse/HDFS-15207?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17055576#comment-17055576
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Xiaoqiao He commented on HDFS-15207:
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Thanks [~hadoop_yangyun] for your works. This improvement seems to depend on
access time of local file attribution. Any case that access this file from
external process but DataNode? And there are also some random reads to get
local file attribution. Is it possible to add {{lastScanTime}} for ReplicaInfo
to determine if scan or skip in the next time? Of cause, it will occupy extra
heap memory. Thanks again.
> 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.patch, HDFS-15207.patch
>
>
> Check the access time of block file to avoid scanning recently changed
> blocks, reducing disk IO.
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