New semantics for recoverLease
------------------------------

                 Key: HDFS-1554
                 URL: https://issues.apache.org/jira/browse/HDFS-1554
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: Hairong Kuang
            Assignee: Hairong Kuang
             Fix For: 0.20-append, 0.22.0, 0.23.0


Current recoverLease API implemented in append 0.20 aims to provide a lighter 
weight (comparing to using create/append) way to trigger a file's soft lease 
expiration. From both the use case of hbase and scribe, it could have a 
stronger semantics: revoking the file's lease, thus starting lease recovery 
immediately.

Also I'd like to port this recoverLease API to HDFS 0.22 and trunk since HBase 
is moving to HDFS 0.22.

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