Michael Han created HDFS-12277:
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Summary: NNThroughputBenchmark should use cumulativeTime to
calculate ops per second.
Key: HDFS-12277
URL: https://issues.apache.org/jira/browse/HDFS-12277
Project: Hadoop HDFS
Issue Type: Bug
Components: benchmarks, tools
Reporter: Michael Han
Assignee: Michael Han
Priority: Minor
{{NNThroughputBenchmark$getOpsPerSecond}} is using {{elapsedTime}} to calculate
ops per second. {{elapsedTime}} is the time used to measure the time from the
start to the finish of the benchmark main thread, and it's also the total
execution time of the single slowest benchmark worker thread. To measure ops
per second, we should use the total execution time of all worker threads, which
is {{cumulativeTime}}. Otherwise, we could get bogus result, e.g. given same
load, the more client threads we have (controlled by {{-threads}}), the larger
ops per second the number would be, with the same NN and its server side
configurations.
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