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Amar Kamat commented on HADOOP-5784:
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Wondering which one is more intuitive, _number-of-heartbeats-per-sec_ or _heartbeat-interval_. The title says _heartbeat-interval_ should be configurable whereas the description states _number-of-heartbeats-per-sec_ should be configurable. I personally think _heartbeat-interval_ is easier to set and play around. Thoughts?

Regarding the test case, cant we spoof tasktracker status and invoke JobTracker.heartbeat() ? This way we can increment the tracker count and query the jobtracker for the current heartbeat interval? Thoughts?
The length of the heartbeat cycle should be configurable.
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Key: HADOOP-5784
URL: https://issues.apache.org/jira/browse/HADOOP-5784
Project: Hadoop Core
Issue Type: Improvement
Components: mapred
Reporter: Owen O'Malley
Assignee: Amareshwari Sriramadasu
Fix For: 0.21.0

Attachments: patch-5784.txt


Currently, the hearbeat cycle is set to (# nodes / 100) in seconds. This can be too long for clusters that need to run low latency jobs. We should make the number of heartbeats that should arrive a second configurable.
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