Fix TaskTracker's heartbeat timer to note the time the hearbeat RPC returned to
decide next heartbeat time
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Key: HADOOP-3875
URL: https://issues.apache.org/jira/browse/HADOOP-3875
Project: Hadoop Core
Issue Type: Bug
Components: mapred
Affects Versions: 0.18.0
Reporter: Arun C Murthy
Assignee: Arun C Murthy
Fix For: 0.19.0
The tasktracker notes the time the heartbeat RPC was fired, rather than when it
returned to decide when to send the next one. If the RPC spends a lot of time
in the JobTracker's queue then the above exacerbates the load on the JobTracker.
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