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https://issues.apache.org/jira/browse/HDFS-3286?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Ashish Singhi updated HDFS-3286:
--------------------------------
Target Version/s: 2.0.0, 3.0.0 (was: 3.0.0, 2.0.0)
Status: Open (was: Patch Available)
> 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
> Assignee: Ashish Singhi
> Fix For: 0.24.0
>
> Attachments: HDFS-3286.patch, HDFS-3286.patch
>
>
> 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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