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From "Zhijie Shen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-925) Augment HistoryStorage Reader Interface to Support Filters When Getting Applications
Date Tue, 28 Jan 2014 06:54:38 GMT

    [ https://issues.apache.org/jira/browse/YARN-925?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13883828#comment-13883828

Zhijie Shen commented on YARN-925:

[~sinchii], thanks for taking care of the filters. I had quick look at the patch. IMO, it's
on the right track. However, the major task of this issue is to optimize the filtering in
the implementation of application history store, in particular FileSystemApplicationHistoryStore.
The current patch still reads each individual history file and loads the full historical information
of an application, followed by a number of filtering conditions. It doesn't make the difference
with doing this filtering in ApplicationHistoryManager. Given a million history files, it
will be a disaster to read all of them.

By pushing the filters back to the implementation of application history store, I suppose
that the implementation knows best about how the historic data is stored, and we can do optimization
here. In the FS implementation, ideally, we should build an index in some way, and only read
the historical files that hit the filters.

> Augment HistoryStorage Reader Interface to Support Filters When Getting Applications
> ------------------------------------------------------------------------------------
>                 Key: YARN-925
>                 URL: https://issues.apache.org/jira/browse/YARN-925
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Mayank Bansal
>            Assignee: Mayank Bansal
>             Fix For: YARN-321
>         Attachments: YARN-925-1.patch, YARN-925-2.patch, YARN-925-3.patch, YARN-925-4.patch,
YARN-925-5.patch, YARN-925-6.patch, YARN-925-7.patch, YARN-925-8.patch
> We need to allow filter parameters for getApplications, pushing filtering to the implementations
of the interface. The implementations should know the best about optimizing filtering. 

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