Tsz Wo Nicholas Sze created HDFS-8826:
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Summary: Balancer may not move blocks efficiently in some cases
Key: HDFS-8826
URL: https://issues.apache.org/jira/browse/HDFS-8826
Project: Hadoop HDFS
Issue Type: Sub-task
Components: balancer & mover
Reporter: Tsz Wo Nicholas Sze
Assignee: Tsz Wo Nicholas Sze
Balancer is inefficient in the following case:
|| Datanode || Utilization || Rack ||
| D1 | 95% | A |
| D2 | 30% | B |
| D3, D4, D5 | 0% | B |
The average utilization is 25% so that D2 is within 10% threshold. However,
Balancer currently will first move blocks from D2 to D3, D4 and D5 since they
are under the same rack. Then, it will move blocks from D1.
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