Erik Krogen created HDFS-13262:
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             Summary: Services should not start threads unnecessarily
                 Key: HDFS-13262
                 URL: https://issues.apache.org/jira/browse/HDFS-13262
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: datanode, namenode, test
            Reporter: Erik Krogen


There are a number of services in HDFS that start a thread even if they are 
disabled. Some services which may not be strictly necessary do not have a way 
to be disabled. This is particularly bad for the unit tests, in which the 
number of threads spawned by concurrent MiniDFSCluster-based tests can grow to 
be very large (e.g. see HDFS-12711)



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