Ashish Singhi created HDFS-3411:
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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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