JobTracker can hold the list of lost TaskTrackers instead of removing them 
completely.
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                 Key: HADOOP-5295
                 URL: https://issues.apache.org/jira/browse/HADOOP-5295
             Project: Hadoop Core
          Issue Type: Improvement
            Reporter: Vinod K V


Having the name and possibly the time for which it has been lost and displaying 
the info via client UI as well as web UI will help in recognizing problematic 
nodes easily and quickly.

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