Review Reuest for HDFS-1447

[Uma Maheswara Rao G 72686]

Hi,

 If you have some free time, can you please review HDFS-1447 ?
 
 HDFS-1447 (Make getGenerationStampFromFile() more efficient, so it doesn't 
reprocess full directory listing for every block)
 
Regards,
Uma