[jira] Commented: (MAPREDUCE-1052) In 0.20, JobHistory parsed files using callbacks [Listener]. In 0.21, JobHistoryParser creates a monolithic JobInfo object.

["Jothi Padmanabhan (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12762542#action_12762542 ] 

Jothi Padmanabhan commented on MAPREDUCE-1052:
----------------------------------------------

You could possibly use the EventReader interface to extract the events from the history file and filter out as required. 

> In 0.20, JobHistory parsed files using callbacks [Listener].  In 0.21, JobHistoryParser creates a monolithic JobInfo object.
> ----------------------------------------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-1052
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1052
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 0.21.0
>            Reporter: Dick King
>             Fix For: 0.21.0
>
>
> In my opinion, this was a change for the worse.
> I would prefer to bring back the callback interface, at least in addition to the JobInfo interface, to give API users the option of not creating the whole object if they only want to glean part of the information.

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