xupeng created HDFS-10328:
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             Summary: Add cache pool level replication managment 
                 Key: HDFS-10328
                 URL: https://issues.apache.org/jira/browse/HDFS-10328
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: caching
            Reporter: xupeng
            Assignee: xupeng
            Priority: Minor


For now, hdfs cacheadmin can not set a replication num for cachepool. Each 
cache directive added in the cache pool should set their own replication num 
individually. 

Consider this situation, we add daily hive table into cache pool "hive" .Each 
time i should set the same replication num for every table directive in the 
same cache pool.  

I think we should enable setting a replication num for cachepool that every 
cache directive in the pool can inherit replication configuration from the 
pool. Also cache directive can override replication configuration explicitly by 
calling "add & modify  directive -replication" command from cli.    






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