Yingda Chen created TEZ-4062:
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Summary: Speculative attempt scheduling should be aborted when
Task has complelted
Key: TEZ-4062
URL: https://issues.apache.org/jira/browse/TEZ-4062
Project: Apache Tez
Issue Type: Bug
Reporter: Yingda Chen
In RedundantScheduleTransition (inside TaskImpl), we try to find the oldest
running attempt and use it as the causual attempt when doing
"addAndScheduleAttempt".
However, the task may have completed at this moment, i.e., the task attempt
that was considered running and long-tailed by speculator is now completed. In
this case, we may not be able to find any unfinished attempt, which will lead
to NPE in following logic (even without NPE, it still makes no sense to proceed
with scheduling speculative attempt anyway)
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