add replication factor for hdfs directory
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Key: HADOOP-4764
URL: https://issues.apache.org/jira/browse/HADOOP-4764
Project: Hadoop Core
Issue Type: New Feature
Components: dfs
Reporter: Ruyue Ma
If we can set replication factor for directory. we can modify the
DFSClent.create() method, pass 0 for the default block replication. Namenode
check create request, if blockreplication is 0, it will give its parent dir
replication factor to the file blockreplication factor. This will simplify the
administration work. You know we can set /Test or /Tmp dir's replication factor
2 or 1, then all their children files and dirs replication factor is 2 or 1
defaultly.
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