如何使用现有的Hadoop集群配置Jaql并使用jaql oprators来过滤结果?

时间:2012-12-04 12:30:13

标签: java hadoop playback jjaql

当我通过给出正确的路径从hdfs读取文件时,文件被成功读取但是当我尝试使用jaql的transform运算符时,它会抛出一个异常,如下所示,如果我尝试在JAQL shell上执行代码,那么job.jar抛出异常,但即使添加了jar之后仍然抛出异常。如果有人知道JAQL在某种程度上没有与现有的hadoop集群正确配置,或者异常是由于其他原因造成的?


我的代码是:

        jaql.setQueryString("read(lines('hdfs://hadoopserver:54310/dbreports/reports.json'," +
                                    "{format: 'org.apache.hadoop.mapred.TextInputFormat',converter: 'com.ibm.jaql.io.hadoop.converter.FromJsonTextConverter'})) -> transform $.store_number;"); 
                System.out.println("jaql running successfully...."); 
                JsonValue jv = jaql.evaluate();
                System.out.println("value is "+jv);

        when run it throws an exception as:


        Exception in thread "Thread-38" java.lang.NoClassDefFoundError: org/apache/commons/httpclient/HttpMethod
            at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:295)
        Caused by: java.lang.ClassNotFoundException: org.apache.commons.httpclient.HttpMethod
            at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
            at java.security.AccessController.doPrivileged(Native Method)
            at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
            at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
            at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
            at sbt.PlayCommands$$anonfun$61$$anonfun$63$$anon$2$$anonfun$loadClass$1.apply(PlayCommands.scala:563)
            at sbt.PlayCommands$$anonfun$61$$anonfun$63$$anon$2$$anonfun$loadClass$1.apply(PlayCommands.scala:563)
            at scala.Option.map(Option.scala:133)
            at sbt.PlayCommands$$anonfun$61$$anonfun$63$$anon$2.loadClass(PlayCommands.scala:563)
            ... 1 more
        java.io.IOException: Job failed!
            ..........

有人知道我错过了什么吗?

0 个答案:

没有答案