[HDFS-544] Add a "rbw" sub directory to DataNode data directory - ASF JIRA

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Hadoop Flags:

Incompatible change, Reviewed
Release Note:

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This issue changes the DataNode data directory layout to be
current
   finalized // store finalized replicas
   rbw // store RBW replicas
tmp // store Temporary replicas
HDFS layout version is changed to be -20.

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This issue changes the DataNode data directory layout to be current    finalized // store finalized replicas    rbw // store RBW replicas tmp // store Temporary replicas HDFS layout version is changed to be -20.

Add a "rbw" sub directory to DataNode to persist RBW, RWR, and RUR replicas.