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https://issues.apache.org/jira/browse/YARN-321?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13706730#comment-13706730
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Zhijie Shen commented on YARN-321:
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bq. How about the Job History Server which is currently handling this for MR
Jobs? Are we moving this responsibility from JHS to AHS to handle for all types
of applications?
IMHO, AHS is used to record the history of some generic data of RM, such as
RMApp, RMAppAttempt and RMContainer, regardless what kind of application it is.
Currently, JHS of MR can coexist with AHS, recording the MR specific data, such
as Job, Task and TaskAttempt. Perhaps in the future, AHS can be enhanced to
record the specific data of a certain type of application by loading the
per-framework "plugin", and JHS may be turned into such a plugin. Agree with
[~vinodkv] on keeping hosting/serving per-framework data out of the scope now.
> 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
>
> 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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