Erik Krogen updated HDFS-13272:
    Issue Type: Improvement  (was: Bug)
       Summary: DataNodeHttpServer to have configurable HttpServer2 threads  
(was: DataNodeHttpServer hard-codes HttpServer2 threads at 10)

> DataNodeHttpServer to have configurable HttpServer2 threads
> -----------------------------------------------------------
>                 Key: HDFS-13272
>                 URL: https://issues.apache.org/jira/browse/HDFS-13272
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>            Reporter: Erik Krogen
>            Assignee: Erik Krogen
>            Priority: Major
> 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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