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https://issues.apache.org/jira/browse/HDFS-4408?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Loughran resolved HDFS-4408.
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Resolution: Duplicate
Release Note: Duplicate of HDFS-1312; closing. of course, HDFS-1312 is
still open
> Balancer for DataNode's Volumes
> ---------------------------------
>
> Key: HDFS-4408
> URL: https://issues.apache.org/jira/browse/HDFS-4408
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Reporter: Li Junjun
>
> After a long time , I found some datanode :
> Volume a,b,c,d their and total space and configurations are same.
> but a used 100% , b c d are not , may be casued by write and delete files
> mega times .
> so it'll be better to write a balancer for datanode's volumes to improve the
> cluster's write performance;
> before balance : 4 write request ,3 volumes handles.
> after balance : 4 write request ,4 volumes handles.
> and in most cases, compute follows write , and it'll improve the read
> performance;
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