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From "Ahmed Hussein (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-9597) Memory efficiency in speculator
Date Mon, 03 Jun 2019 23:32:00 GMT
Ahmed Hussein created YARN-9597:

             Summary: Memory efficiency in speculator 
                 Key: YARN-9597
                 URL: https://issues.apache.org/jira/browse/YARN-9597
             Project: Hadoop YARN
          Issue Type: Improvement
            Reporter: Ahmed Hussein

The data structures in speculator and runtime-estimator are bloating. Data elements such as
(taskID, TA-ID, task stats, tasks speculated, tasks finished..etc) are added to the concurrent
maps but never removed.

For long running jobs, there are couple of issues:
 # memory leakage: the speculator memory usage increases over time. 
 # performance: keeping large structures in the heap affects the performance due to locality
and cache misses.

*Suggested Fixes:*

- When a TA transitions to {{MoveContainerToSucceededFinishingTransition}}, the TA notifies
the speculator. The latter handles the event by cleaning the internal structure accordingly.
- When a task transitions is failed/killed, the speculator is notified to clean the internal
data structure.


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