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From "Ashish Singhi (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3411) Balancer fails to balance blocks between aboveAvgUtilized and belowAvgUtilized datanodes.
Date Sat, 12 May 2012 15:12:49 GMT
Ashish Singhi created HDFS-3411:
-----------------------------------

             Summary: Balancer fails to balance blocks between aboveAvgUtilized and belowAvgUtilized
datanodes.
                 Key: HDFS-3411
                 URL: https://issues.apache.org/jira/browse/HDFS-3411
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: balancer
    Affects Versions: 0.23.0
            Reporter: Ashish Singhi
             Fix For: 2.0.0, 3.0.0


Scaenario:
replication set to 1.
1. Start 1NN and IDN
2. pump 1GB of data.
3. Start one more DN
4. Run balancer with threshold 1.

Now DN1 is added into aboveAvgUtilizedDatanodes and DN2 into belowAvgUtilizedDatanodes. Hence
overLoadedBytes and underLoadedBytes will be equal to 0. Resulting in bytesLeftToMove equal
to 0. Thus balancer will exit without balancing the blocks.

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