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From "Bikas Saha (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-321) Generic application history service
Date Wed, 17 Jul 2013 17:47:50 GMT

    [ https://issues.apache.org/jira/browse/YARN-321?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13711345#comment-13711345
] 

Bikas Saha commented on YARN-321:
---------------------------------

Folks, it would be great if we have a consolidated document that describes the design and
some details. We can keep posting revisions of the document to this jira as things changes
significantly. HDFS-2802 is an example. Its a little difficult to piece it together from multiple
comments and clarifications.
                
> 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
>            Assignee: Vinod Kumar Vavilapalli
>         Attachments: 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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