Github user KaiXinXiaoLei commented on the pull request:

    https://github.com/apache/spark/pull/2989#issuecomment-61040188
  
    Using the maven-dependency-plugin to build spark, I get the dependency tree 
for spark. I find the jetty 6 is introduced by hdfs ,yarn, flume and hbase. 
From the info of dependency tree, here I just give the information about Jetty 
6.
    The Jetty 6 is brought by hdfs when building spark-core:
    [INFO] +- org.apache.hadoop:hadoop-client:jar:2.4.1:compile
    [INFO] |  +- org.apache.hadoop:hadoop-hdfs:jar:2.4.1:compile
    [INFO] |  |  \- org.mortbay.jetty:jetty-util:jar:6.1.26:compile
    
    The Jetty 6 is brought by yarn when building spark-yarn:
    [INFO] +- org.apache.hadoop:hadoop-yarn-server-web-proxy:jar:2.4.1:compile
    [INFO] |  +- org.apache.hadoop:hadoop-yarn-server-common:jar:2.4.1:compile
    [INFO] |  +- commons-httpclient:commons-httpclient:jar:3.1:compile
    [INFO] |  \- org.mortbay.jetty:jetty:jar:6.1.26:compile
    [INFO] +- org.apache.hadoop:hadoop-yarn-client:jar:2.4.1:compile
    [INFO] |  +- org.mortbay.jetty:jetty-util:jar:6.1.26:compile
    
    The Jetty 6 is brought by flume when building spark-streaming-flume:
    [INFO] +- 
org.apache.spark:spark-streaming-flume-sink_2.10:jar:1.2.0-SNAPSHOT:compile
    [INFO] |  \- org.apache.flume:flume-ng-core:jar:1.4.0:compile
    [INFO] |     +- org.mortbay.jetty:jetty-util:jar:6.1.26:compile
    [INFO] |     +- org.mortbay.jetty:jetty:jar:6.1.26:compile
    
    The Jetty 6 is brought by hbase when building spark-examples:
    [INFO] +- org.apache.hbase:hbase:jar:0.94.6:compile
    [INFO] |  +- org.mortbay.jetty:jetty:jar:6.1.26:compile
    [INFO] |  +- org.mortbay.jetty:jetty-util:jar:6.1.26:compile


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