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From "J.Andreina (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3286) When the threshold value for balancer is 0(zero) ,unexpected output is displayed
Date Tue, 17 Apr 2012 16:00:18 GMT
When the threshold value for balancer is 0(zero) ,unexpected output is displayed
--------------------------------------------------------------------------------

                 Key: HDFS-3286
                 URL: https://issues.apache.org/jira/browse/HDFS-3286
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: balancer
    Affects Versions: 0.23.0
            Reporter: J.Andreina
             Fix For: 0.24.0


Replication factor =1
Step 1: Start NN,DN1.write 4 GB of data
Step 2: Start DN2
Step 3: issue the balancer command(./hdfs balancer -threshold 0)

The threshold parameter is a fraction in the range of (0%, 100%) with a default value of 10%
When the above scenario is executed the Source DN and Target DN is choosen and the number
of bytes to be moved from source to target DN is also calculated .

Then the balancer is exiting with the following message "No block can be moved. Exiting..."
which is not expected.

{noformat}
HOST-xx-xx-xx-xx:/home/Andreina/APril10/install/hadoop/namenode/bin # ./hdfs balancer -threshold
0
12/04/16 16:22:07 INFO balancer.Balancer: Using a threshold of 0.0
12/04/16 16:22:07 INFO balancer.Balancer: namenodes = [hdfs://HOST-xx-xx-xx-xx:9000]
12/04/16 16:22:07 INFO balancer.Balancer: p         = Balancer.Parameters[BalancingPolicy.Node,
threshold=0.0]
Time Stamp               Iteration#  Bytes Already Moved  Bytes Left To Move  Bytes Being
Moved
12/04/16 16:22:10 INFO net.NetworkTopology: Adding a new node: /default-rack/yy.yy.yy.yy:50176
12/04/16 16:22:10 INFO net.NetworkTopology: Adding a new node: /default-rack/xx.xx.xx.xx:50010
12/04/16 16:22:10 INFO balancer.Balancer: 1 over-utilized: [Source[xx.xx.xx.xx:50010, utilization=7.212458091389678]]
12/04/16 16:22:10 INFO balancer.Balancer: 1 underutilized: [BalancerDatanode[yy.yy.yy.yy:50176,
utilization=4.650670324367203E-5]]
12/04/16 16:22:10 INFO balancer.Balancer: Need to move 1.77 GB to make the cluster balanced.
No block can be moved. Exiting...
Balancing took 5.142 seconds
{noformat}

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