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https://issues.apache.org/jira/browse/HDFS-15655?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17247205#comment-17247205
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Yang Yun edited comment on HDFS-15655 at 12/11/20, 1:40 AM:
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Thanks [~ayushtkn] for your review. Sorry for the late reply.
I tested on my test environment there is no behaviour change and nothing is
broken. In next few days，this feature will be online in our production
environment, I will update this Jira if we meet new issue.
was (Author: hadoop_yangyun):
Thanks [~ayushtkn] fot your review. Sorry for the late reply.
I tested on my test environment there is no behaviour change and nothing is
broken. In next few days，this feature will be online in our production
environment, I will update this Jira if we meet new issue.
> 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,
> HDFS-15655.003.patch, HDFS-15655.004.patch, HDFS-15655.005.patch,
> HDFS-15655.006.patch, HDFS-15655.007.patch, HDFS-15655.008.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 config key " dfs.namenode.hot.block.time.interval", the balancer
> prefer to get the blocks which are belong to the cold files created before
> this time period.
> Also add a option "-hotBlockTimeInterval" to the command line of balancer for
> inputting.
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