Jobtracker API错误 - 在本地异常上调用localhost/127.0.0.1:50030失败:java.io.EOFException

Question

我正在尝试使用Java连接我的jobtracker.
下面显示的是我试图执行的程序

                   public static void main(String args[]) throws IOException {

            Configuration conf = new Configuration();
            conf.addResource(new Path(
                    "/home/user/hadoop-1.0.3/conf/core-site.xml"));
            conf.addResource(new Path(
                    "/home/user/hadoop-1.0.3/conf/hdfs-site.xml"));
            conf.addResource(new Path(
                    "/home/user/hadoop-1.0.3/conf/mapred-site.xml"));


            InetSocketAddress jobtracker = new InetSocketAddress("localhost", 50030);
            JobClient jobClient = new JobClient(jobtracker, conf);
            jobClient.setConf(conf);
            JobStatus[] jobs = jobClient.jobsToComplete();

            for (int i = 0; i < jobs.length; i++) {
                JobStatus js = jobs[i];
                if (js.getRunState() == JobStatus.RUNNING) {
                    JobID jobId = js.getJobID();
                    System.out.println(jobId);
                }
            }

这是我得到的例外.即使我尝试用127.0.0.1替换localhost也不行.同样的错误.

 Exception in thread "main" java.io.IOException: Call to localhost/127.0.0.1:50030 failed on local exception: java.io.EOFException
        at org.apache.hadoop.ipc.Client.wrapException(Client.java:1107)
        at org.apache.hadoop.ipc.Client.call(Client.java:1075)
        at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:225)
        at org.apache.hadoop.mapred.$Proxy1.getProtocolVersion(Unknown Source)
        at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:396)
        at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:379)
        at org.apache.hadoop.mapred.JobClient.createRPCProxy(JobClient.java:480)
        at org.apache.hadoop.mapred.JobClient.<init>(JobClient.java:534)
        at com.tcs.nextgen.searchablemetadata.executor.factory.JobChecker.main(JobChecker.java:34)
    Caused by: java.io.EOFException
        at java.io.DataInputStream.readInt(DataInputStream.java:375)
        at org.apache.hadoop.ipc.Client$Connection.receiveResponse(Client.java:811)
        at org.apache.hadoop.ipc.Client$Connection.run(Client.java:749)

我添加了与hadoop相关的所有罐子.我无法理解为什么"/"在localhost/127.0.0.1:50030之间进行

Answer 1

您是否尝试过实际的jobtracker端口号,而不是http端口(50030).

尝试在mapred.job.tracker属性下的$ HADOOP_HOME/conf/mapred-site.xml中列出的端口号.这是我的伪mapred-site.xml conf

<property>
    <name>mapred.job.tracker</name>
    <value>localhost:9001</value>
</property>

如果查看该JobTracker.getAddress(Configuration)方法,如果未明确指定jobtracker主机/端口,则可以看到它使用此属性:

public static InetSocketAddress getAddress(Configuration conf) {
  String jobTrackerStr =
    conf.get("mapred.job.tracker", "localhost:8012");
  return NetUtils.createSocketAddr(jobTrackerStr);
}