Harsh J created HDFS-3645:
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Summary: Improve the way we do detection of a busy DN in the
cluster, when choosing it for a block write
Key: HDFS-3645
URL: https://issues.apache.org/jira/browse/HDFS-3645
Project: Hadoop HDFS
Issue Type: Improvement
Components: name-node
Affects Versions: 2.0.0-alpha
Reporter: Harsh J
Priority: Minor
Right now, I think we do too naive a computation for detecting if a chosen DN
target is busy by itself. We currently do {{node.getXceiverCount() > (2.0 *
avgLoad)}}.
We should improve on this computation with a more realistic measure of if a DN
is really busy by itself or not (rather than checking against cluster average,
where there's a good chance the value can be wrong to compare with, for some
cases)
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