Combine TaskTracker information into single class in JobTracker
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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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