Chen He created HDFS-6342:
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Summary: TestBalancerWithNodeGroup.testBalancerWithRackLocality
may fail if balancer.id file is huge
Key: HDFS-6342
URL: https://issues.apache.org/jira/browse/HDFS-6342
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: Chen He
Assignee: Chen He
The testBalancerWithRackLocality mehtod is to test balancer moving data blocks
with rack locality consideration.
It crates two nodes cluster. One node belongs to rack0nodeGroup0, theother node
blongs to rack1nodeGroup1. In this 2 datanodes minicluster, block size is 10B
and total cluster capacity is 6000B ( 3000B on each datanodes). It create 180
data blocks with replication factor 2. Then, a node datanode is created (in
rack1nodeGroup2) and balancer starts to balancing the cluster.
It expects there is only data blocks moving within rack1. After balancer is
done, it assumes the data size on both racks is the same. It will break
if balancer.id file is huge and there is inter-rack data block moving.
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