HAR files used for RAID parity need to have configurable partfile size
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                 Key: HDFS-1175
                 URL: https://issues.apache.org/jira/browse/HDFS-1175
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: contrib/raid
    Affects Versions: 0.20.1
            Reporter: Ramkumar Vadali
            Priority: Minor


RAID parity files are merged into HAR archives periodically. This is required 
to reduce the number of files that the NameNode has to track. The number of 
files present in a HAR archive depends on the size of HAR part files - higher 
the size, lower the number of files.
The size of HAR part files is configurable through the setting 
har.partfile.size, but that is a global setting. This task introduces a new 
setting specific to raid.har.partfile.size, that is used in-turn to set 
har.partfile.size


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