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https://issues.apache.org/jira/browse/HDFS-15549?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17192089#comment-17192089
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jianghua zhu commented on HDFS-15549:
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[~LeonG] , have you encountered some difficult problems?
> Improve DISK/ARCHIVE movement if they are on same filesystem
> ------------------------------------------------------------
>
> Key: HDFS-15549
> URL: https://issues.apache.org/jira/browse/HDFS-15549
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: datanode
> Reporter: Leon Gao
> Assignee: Leon Gao
> Priority: Major
>
> When moving blocks between DISK/ARCHIVE, we should prefer the volume on the
> same underlying filesystem and use "rename" instead of "copy" to save IO.
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