Need a mechanism for data nodes to update generation stamps.
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                 Key: HADOOP-3283
                 URL: https://issues.apache.org/jira/browse/HADOOP-3283
             Project: Hadoop Core
          Issue Type: New Feature
            Reporter: Tsz Wo (Nicholas), SZE


For implementing file append feature (HADOOP-1700), a generation stamp is added 
to each block.  We need a mechanism for data nodes to update generation stamps 
for lease recovery.

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