[hbase] when the master times out a region server's lease, it is too aggressive 
in reclaiming the server's log
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                 Key: HADOOP-1937
                 URL: https://issues.apache.org/jira/browse/HADOOP-1937
             Project: Hadoop
          Issue Type: Bug
          Components: contrib/hbase
    Affects Versions: 0.15.0
            Reporter: Jim Kellerman
            Assignee: Jim Kellerman
             Fix For: 0.15.0


When a region server's lease times out, the master immediately begins trying to 
split the server's log file. There have been cases where a region server was 
just a little late reporting to the master and the master had already started 
trying to reclaim the server's log, even though the server was still writing to 
it. 

There needs to be some kind of "grace period" in which, if the region server 
reports in, the master re-instates the server. If the "grace period" expires, 
then the master should start processing the server's log.

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