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From "Siddharth Seth (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3002) Delink History Context from AppContext
Date Thu, 15 Sep 2011 04:04:11 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3002?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13105092#comment-13105092
] 

Siddharth Seth commented on MAPREDUCE-3002:
-------------------------------------------

{{AppContext}} is meant for a single Application which may have multiple jobs. This was used
in MR JobHistory to be able to share the UI - all known jobs end up belonging to a single
dummy App.
Most of the {{AppContext}} interface isn't useful for JobHistory - {{getAppAttemptId()}},
{{getStartTime()}} etc. Functionality required by JobHistory is getAllJobsForListingPage(params?),
getJob(JobId) and at some point it may support Apps.
The current equivalent of getAllJobsForListingPage - returns a partial implementation of the
{{Job}} interface. This could be replaced by whatever it is we require on the listing page.
getJob ofc can continue to use the {{Job}} interface.

> Delink History Context from AppContext
> --------------------------------------
>
>                 Key: MAPREDUCE-3002
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3002
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: jobhistoryserver, mrv2
>    Affects Versions: 0.24.0
>            Reporter: Robert Joseph Evans
>
> Currently the JobHistory Server has a HistoryContext that pretends to be a Map Reduce
ApplicationMaster's AppContext so that UI pages can be shared between the two.  This is not
ideal because the UIs have already diverged a lot, and we have to translate the native History
Server's data into implementations of Job to provide the same interface.

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