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https://issues.apache.org/jira/browse/HADOOP-4772?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12653275#action_12653275
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Amar Kamat commented on HADOOP-4772:
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+1. I feel its right time to fix HADOOP-3343 also. Something like {{TrackerID}} 
and {{TrackerManager}}.

> Combine TaskTracker information into single class in JobTracker
> ---------------------------------------------------------------
>
>                 Key: HADOOP-4772
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4772
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: mapred
>            Reporter: Sharad Agarwal
>
> Currently tracker related information is spanned thru multiple 
> datastructures. eg. trackerToTaskMap, trackerToMarkedTasksMap, 
> trackerToHeartbeatResponseMap etc. These are hard to maintain. It would be 
> efficient (as there won't be multiple searches in TreeSet) and much more 
> manageable code if we create a single class say TrackerInfo; and just have 
> one map of trackerId to TrackerInfo

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