Lower minimum heartbeat interval for tasktracker > Jobtracker -------------------------------------------------------------
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? -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.