Siddharth Seth created YARN-5193:
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             Summary: For long running services, aggregate logs when a 
container completes instead of when the app completes
                 Key: YARN-5193
                 URL: https://issues.apache.org/jira/browse/YARN-5193
             Project: Hadoop YARN
          Issue Type: Improvement
            Reporter: Siddharth Seth


For a long running service, containers will typically not complete very often. 
However, when a container completes - it would be useful to aggregate the logs 
right then, instead of waiting for the app to complete.
This will allow the command line log tool to lookup containers for an app from 
the log file index itself, instead of having to go and talk to YARN. Talking to 
YARN really only works if ATS is enabled, and YARN is configured to publish 
container information to ATS (That may not always be the case - since this can 
overload ATS quite fast).

There's some added benefits like cleaning out local disk space early, instead 
of waiting till the app completes. (There's probably a separate jira somewhere 
about cleanup of container for long running services anyway)

cc [~vinodkv], [~xgong]



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