NNBench creates duplicate files if multiple maps are run from the same client
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Key: HDFS-2635
URL: https://issues.apache.org/jira/browse/HDFS-2635
Project: Hadoop HDFS
Issue Type: Bug
Components: test
Affects Versions: 0.20.205.0, 0.20.204.0, 0.20.203.0
Reporter: cp...@kence.org
Priority: Minor
NNBench creates files in the format:
file_<hostname>__<filenum>
This works seamlessly as long as all of the Hadoop clients in the cluster are
each running with a single map slot. If multiple map slots are available on a
single client, each mapper tries to create the same set of files. This can
result in lock contention on some non-Hadoop HDFS implementations thereby
defeating the purpose of the NNBench test.
Making the files unique per mapper, not per host, resolves this.
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