Xuan Gong commented on YARN-221:

I think that we could have this configuration
which can be used as default log-aggregation-policy. If the users do not 
specify the policy class in ASC, the default policy will be used

But maybe we do not need this one to specify the policy parameters:
Instead, we could set the default value for the policy. 

Also, in AppLogAggregator.java (From NM), after we parse the policy from ASC, 
we should do 

Others are fine to me.

> NM should provide a way for AM to tell it not to aggregate logs.
> ----------------------------------------------------------------
>                 Key: YARN-221
>                 URL: https://issues.apache.org/jira/browse/YARN-221
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: log-aggregation, nodemanager
>            Reporter: Robert Joseph Evans
>            Assignee: Ming Ma
>         Attachments: YARN-221-trunk-v1.patch, YARN-221-trunk-v2.patch, 
> YARN-221-trunk-v3.patch, YARN-221-trunk-v4.patch, YARN-221-trunk-v5.patch
> The NodeManager should provide a way for an AM to tell it that either the 
> logs should not be aggregated, that they should be aggregated with a high 
> priority, or that they should be aggregated but with a lower priority.  The 
> AM should be able to do this in the ContainerLaunch context to provide a 
> default value, but should also be able to update the value when the container 
> is released.
> This would allow for the NM to not aggregate logs in some cases, and avoid 
> connection to the NN at all.

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