Erik Krogen created HDFS-13265:

             Summary: MiniDFSCluster should set reasonable defaults to reduce 
resource consumption
                 Key: HDFS-13265
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: datanode, namenode, test
            Reporter: Erik Krogen

MiniDFSCluster takes its defaults from {{DFSConfigKeys}} defaults, but many of 
these are not suitable for a unit test environment. For example, the default 
handler thread count of 10 is definitely more than necessary for (almost?) any 
unit test. We should set reasonable, lower defaults unless a test specifically 
requires more.

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