Bikas Saha created TEZ-2431:
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Summary: Recovery of task events (eg. datamovement events) should
not depend on ordering of task attempt events
Key: TEZ-2431
URL: https://issues.apache.org/jira/browse/TEZ-2431
Project: Apache Tez
Issue Type: Sub-task
Reporter: Bikas Saha
Today, task attempt events need to go through verteximpl before reaching the
task in order to maintain ordering guarantees for recovery. This causes these
events to be routed twice through the dispatcher. This can cause overhead
delays in large jobs. Also, this makes assumptions about event ordering which
make the system fragile. Recovery should work independently of other system
interactions so that evolution of other components is not affected by recovery
unless it affects recovery logically.
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