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https://issues.apache.org/jira/browse/HDFS-15655?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17231511#comment-17231511
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Yang Yun commented on HDFS-15655:
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Thanks [~jianghuazhu] fot the suggestion.
Yes, it's better to add options to the balancer command. It may need to add a
more argument to of the function getBlocks(). I'll try...
> Add option to make balancer prefer to get cold blocks
> -----------------------------------------------------
>
> Key: HDFS-15655
> URL: https://issues.apache.org/jira/browse/HDFS-15655
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: balancer & mover
> Reporter: Yang Yun
> Assignee: Yang Yun
> Priority: Minor
> Attachments: HDFS-15655.001.patch, HDFS-15655.002.patch
>
>
> We met two issues when using balancer.
> # Moving hot files may cause failing of dfsclient reading.
> # Some blocks of temporary files are moved and they are deleted soon.
> Add a option dfs.namenode.hot.block.interval, the balancer prefer to get the
> blocks which are belong to the cold files created before this time period.
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