Varun Saxena commented on YARN-5955:

We have actually made quite a few changes to make recovery faster internally.
And this includes using multiple threads for recovery in addition to other 

Plan to contribute along with Ajith to community. Will upload a design doc and 
initial patch soon.

> Use threadpool or multiple thread to recover app
> ------------------------------------------------
>                 Key: YARN-5955
>                 URL: https://issues.apache.org/jira/browse/YARN-5955
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: resourcemanager
>    Affects Versions: 2.7.1
>            Reporter: 5feixiang
>            Assignee: Ajith S
>             Fix For: 2.7.1
> current app recovery is one by one,use thead pool can make recovery faster.

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