Zhijie Shen resolved YARN-1835.
    Resolution: Invalid

The ApplicationHistoryManager has a new implementation, which doesn't have the 
aforementioned issue.

> History client service needs to be more robust
> ----------------------------------------------
>                 Key: YARN-1835
>                 URL: https://issues.apache.org/jira/browse/YARN-1835
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Zhijie Shen
>            Assignee: Zhijie Shen
> While doing the test, I've found the following issues so far:
> 1. The history file not found exception is exposed to the user directly, 
> which is better to be caught and translated into ApplicationNotFound.
> 2. NPE will be exposed as well, since ApplicationHistoryManager doesn't do 
> necessary null check.
> In addition, TestApplicationHistoryManagerImpl missed to test most 
> ApplicationHistoryManager methods.

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