Zhijie Shen resolved YARN-321.
    Resolution: Fixed

Close this umbrella jira with few sub tasks open. Generic history service has 
been implemented and rides on timeline server. YARN-2271 is left open to track 
one possible performance issue to fetch all the applications stored in the 
timeline store.

> Generic application history service
> -----------------------------------
>                 Key: YARN-321
>                 URL: https://issues.apache.org/jira/browse/YARN-321
>             Project: Hadoop YARN
>          Issue Type: Improvement
>            Reporter: Luke Lu
>         Attachments: AHS Diagram.pdf, ApplicationHistoryServiceHighLevel.pdf, 
> Generic Application History - Design-20131219.pdf, HistoryStorageDemo.java
> The mapreduce job history server currently needs to be deployed as a trusted 
> server in sync with the mapreduce runtime. Every new application would need a 
> similar application history server. Having to deploy O(T*V) (where T is 
> number of type of application, V is number of version of application) trusted 
> servers is clearly not scalable.
> Job history storage handling itself is pretty generic: move the logs and 
> history data into a particular directory for later serving. Job history data 
> is already stored as json (or binary avro). I propose that we create only one 
> trusted application history server, which can have a generic UI (display json 
> as a tree of strings) as well. Specific application/version can deploy 
> untrusted webapps (a la AMs) to query the application history server and 
> interpret the json for its specific UI and/or analytics.

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