[jira] Created: (MAPREDUCE-1247) Send out-of-band heartbeat to avoid fake lost tasktracker

["ZhuGuanyin (JIRA)" <ji...@apache.org>]

Send out-of-band heartbeat to avoid fake lost tasktracker
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                 Key: MAPREDUCE-1247
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1247
             Project: Hadoop Map/Reduce
          Issue Type: New Feature
            Reporter: ZhuGuanyin


Currently the TaskTracker report task status to jobtracker through heartbeat, sometimes if the tasktracker  lock the tasktracker to do some cleanup  job, like remove task temp data on disk, the heartbeat thread would hang for a long time while waiting for the lock, so the jobtracker just thought it had lost and would reschedule all its finished maps or un finished reduce on other tasktrackers, we call it "fake lost tasktracker", some times it doesn't acceptable especially when we run some large jobs.  So We introduce a out-of-band heartbeat mechanism to send an out-of-band heartbeat in that case.

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