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From "Li Junjun (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-4408) Balancer for DataNode's Volumes
Date Wed, 16 Jan 2013 05:32:12 GMT
Li Junjun created HDFS-4408:

             Summary: 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

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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