Use HAR filesystem to merge parity files 
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                 Key: HDFS-684
                 URL: https://issues.apache.org/jira/browse/HDFS-684
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: contrib/raid
            Reporter: dhruba borthakur


The HDFS raid implementation (HDFS-503) creates a parity file for every file 
that is RAIDed. This puts additional burden on the memory requirements of the 
namenode. It will be  nice if the parity files are combined together using the 
HadoopArchive (har) format. 

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