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Posted to yarn-issues@hadoop.apache.org by "Ahmed Hussein (JIRA)" <ji...@apache.org> on 2019/06/03 23:32:00 UTC
[jira] [Created] (YARN-9597) Memory efficiency in speculator
Ahmed Hussein created YARN-9597:
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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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