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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-4408) Balancer for DataNode's Volumes
Date Wed, 16 Jan 2013 08:58:12 GMT

     [ https://issues.apache.org/jira/browse/HDFS-4408?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Steve Loughran resolved HDFS-4408.
----------------------------------

      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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