Lower minimum heartbeat interval for tasktracker > Jobtracker
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Key: MAPREDUCE-1906
URL: https://issues.apache.org/jira/browse/MAPREDUCE-1906
Project: Hadoop Map/Reduce
Issue Type: Improvement
Affects Versions: 0.20.2, 0.20.1
Reporter: Scott Carey
I get a 0% to 15% performance increase for smaller clusters by making the
heartbeat throttle stop penalizing clusters with less than 300 nodes.
Between 0.19 and 0.20, the default minimum heartbeat interval increased from 2s
to 3s. If a JobTracker is throttled at 100 heartbeats / sec for large
clusters, why should a cluster with 10 nodes be throttled to 3.3 heartbeats per
second?
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