Erik Krogen created HDFS-13272:

             Summary: DataNodeHttpServer hard-codes HttpServer2 threads at 10
                 Key: HDFS-13272
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: datanode
            Reporter: Erik Krogen
            Assignee: Erik Krogen

In HDFS-7279, the Jetty server on the DataNode was hard-coded to use 10 
threads. In addition to the possibility of this being too few threads, it is 
much higher than necessary in resource constrained environments such as 
MiniDFSCluster. To avoid compatibility issues, rather than using 
{{HttpServer2#HTTP_MAX_THREADS}} directly, we can introduce a new configuration 
for the DataNode's thread pool size.

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