Rajesh Balamohan created TEZ-4147:
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Summary: Reduce NN calls in RecoveryService::handleRecoveryEvent
Key: TEZ-4147
URL: https://issues.apache.org/jira/browse/TEZ-4147
Project: Apache Tez
Issue Type: Improvement
Reporter: Rajesh Balamohan
[https://github.com/apache/tez/blob/master/tez-dag/src/main/java/org/apache/tez/dag/history/recovery/RecoveryService.java#L459]
[https://github.com/apache/tez/blob/master/tez-dag/src/main/java/org/apache/tez/dag/history/recovery/RecoveryService.java#L467]
{{create(overwrite=false)}} already checks for file exists and throws relevant
exception. It should be possible to reduce
{{recoveryDirFS.exists(dagFilePath)}} check to help in concurrent job runs (e.g
50-100 AM trying to run very short jobs).
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