我正在尝试链接一些流作业（用python编写的作业）。我做到了，但我对-d命令有问题。这是密码，

public class OJs extends Configured implements Tool
{
public int run( String[] args) throws Exception
{
    //DOMINATION
    Path domin      = new Path( "diploma/join.txt");
    //dominationm.py
    Path domout     = new Path( "mapkeyout/");
    //dominationr.py

    String[] dom = new String[]
    {
        "-D mapred.reduce.tasks=0",
        "-file"     , "/home/hduser/optimizingJoins/dominationm.py" ,
        "-mapper"   , "dominationm.py"                              ,
        "-file"     , "/home/hduser/optimizingJoins/dominationr.py" ,
        "-reducer"  , "dominationr.py",         
        "-input"    , domin.toString()                              ,
        "-output"   , domout.toString()
    };
    JobConf domConf = new StreamJob().createJob( dom);
    //run domination job
    JobClient.runJob( domConf);
    return 0;
}//end run

public static void main( String[] args) throws Exception
{
    int res = ToolRunner.run( new Configuration(), new OJs(), args);
    System.exit( res);
}//end main
}//end OJs

我的问题是命令“-d mapred.reduce.tasks=0”。我得到这个错误，

ERROR streaming.StreamJob: Unrecognized option: -D...

在那里。。。包括任何可能的语法组合，即。

"-D mapred.reduce.tasks=0"
"-Dmapred.reduce.tasks=0"
"-D", "mapred.reduce.tasks=0"
"-D", "mapred.reduce.tasks=", "0"
" -D mapred.reduce.tasks=0"

等。
如果-d之前有空格，则忽略此命令。我没有我指定的减速机数量。当我没有这个空间时，我得到了我提到的错误。
我做错什么了？
编辑
用-jobconf替换-d选项并不能解决问题。这是整个错误输出，

Warning: $HADOOP_HOME is deprecated.

    12/10/04 00:25:02 ERROR streaming.StreamJob: Unrecognized option: -jobconf mapred.reduce.tasks=0
    Usage: $HADOOP_HOME/bin/hadoop jar \
          $HADOOP_HOME/hadoop-streaming.jar [options]

    Options:
   -input    <path>     DFS input file(s) for the Map step

   -output   <path>     DFS output directory for the Reduce step

   -mapper   <cmd|JavaClassName>      The streaming command to run

   -combiner <cmd|JavaClassName> The streaming command to run

   -reducer  <cmd|JavaClassName>      The streaming command to run

   -file     <file>     File/dir to be shipped in the Job jar file

   -inputformat TextInputFormat(default)|SequenceFileAsTextInputFormat|JavaClassName Optional.

   -outputformat TextOutputFormat(default)|JavaClassName  Optional.

   -partitioner JavaClassName  Optional.

   -numReduceTasks <num>  Optional.

   -inputreader <spec>  Optional.

   -cmdenv   <n>=<v>    Optional. Pass env.var to streaming commands

   -mapdebug <path>  Optional. To run this script when a map task fails 

   -reducedebug <path>  Optional. To run this script when a reduce task fails 

   -io <identifier>  Optional.

   -verbose

   Generic options supported are

   -conf <configuration file>     specify an application configuration file

   -D <property=value>            use value for given property

   -fs <local|namenode:port>      specify a namenode

   -jt <local|jobtracker:port>    specify a job tracker

   -files <comma separated list of files>    specify comma separated files to be copied to the map reduce cluster

   -libjars <comma separated list of jars>    specify comma separated jar files to include in the classpath.

   -archives <comma separated list of archives>    specify comma separated archives to be unarchived on the compute machines.

   The general command line syntax is
   bin/hadoop command [genericOptions] [commandOptions]

   For more details about these options:

   Use $HADOOP_HOME/bin/hadoop jar build/hadoop-streaming.jar -info

   Exception in thread "main" java.lang.IllegalArgumentException: 
    at org.apache.hadoop.streaming.StreamJob.fail(StreamJob.java:549)
    at org.apache.hadoop.streaming.StreamJob.exitUsage(StreamJob.java:486)
    at org.apache.hadoop.streaming.StreamJob.parseArgv(StreamJob.java:246)
    at org.apache.hadoop.streaming.StreamJob.createJob(StreamJob.java:143)
    at OJs.run(OJs.java:135)
    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
    at OJs.main(OJs.java:183)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at org.apache.hadoop.util.RunJar.main(RunJar.java:156)

此外，我不明白，为什么当我直接使用流式处理运行作业时，流式处理会识别-d选项，而当我通过jobclient使用流式处理运行作业时，-d选项识别会失败。是流媒体问题还是sun.reflect问题？ubuntu中的sun.reflect包在哪里？