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Date: Sat, 24 Oct 2015 13:31:27 +0000 (UTC)
From: "Lin Yiqun (JIRA)" <jira@apache.org>
To: hdfs-dev@hadoop.apache.org
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Subject: [jira] [Created] (HDFS-9303) Balancer slowly with too many small
 file blocks
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Lin Yiqun created HDFS-9303:
-------------------------------

             Summary: Balancer slowly with too many small file blocks
                 Key: HDFS-9303
                 URL: https://issues.apache.org/jira/browse/HDFS-9303
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: balancer & mover
    Affects Versions: 2.7.1
            Reporter: Lin Yiqun
            Assignee: Lin Yiqun


In the recent hadoop release versions I found that balance operation is always so slowly, even though I upgrade the version.When I analyse balancer log, I found that in every balance iteration,it use only 4 to 5 minutes, and is a short time.And The most important is that the most of being moving blocks is small blocks ,and the size is smaller than 1M.And this is a main reason of the low effective of balance operation.


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