Pig java.lang.NoSuchFieldException: jobsInProgress异常

Question

我正在使用pig-0.11.0+28和CDH4，当我运行任何Pig作业时，我会得到这个异常。我也会在本地模式下发生。有什么想法吗？

2013-07-08 13:53:44,035 [main] WARN  org.apache.pig.backend.hadoop23.PigJobControl - falling back to default JobControl (not using hadoop 0.23 ?)
  java.lang.NoSuchFieldException: jobsInProgress
    at java.lang.Class.getDeclaredField(Class.java:1938)
    at org.apache.pig.backend.hadoop23.PigJobControl.<clinit>(PigJobControl.java:58)
    at org.apache.pig.backend.hadoop.executionengine.shims.HadoopShims.newJobControl(HadoopShims.java:102)
    at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.JobControlCompiler.compile(JobControlCompiler.java:285)
    at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher.launchPig(MapReduceLauncher.java:177)
    at org.apache.pig.PigServer.launchPlan(PigServer.java:1266)
    at org.apache.pig.PigServer.executeCompiledLogicalPlan(PigServer.java:1251)
    at org.apache.pig.PigServer.execute(PigServer.java:1241)
    at org.apache.pig.PigServer.executeBatch(PigServer.java:335)
    at org.apache.pig.tools.grunt.GruntParser.executeBatch(GruntParser.java:137)
    at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:198)
    at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:170)
    at org.apache.pig.tools.grunt.Grunt.exec(Grunt.java:84)
    at org.apache.pig.Main.run(Main.java:604)
    at org.apache.pig.Main.main(Main.java:157)
    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:606)
    at org.apache.hadoop.util.RunJar.main(RunJar.java:208)

Answer 1

此警告在运行时是无害的。

Pig被设计成可以与许多版本一起工作。

由于CDH4发布了带有MR1 (0.20/1.x) MR框架选项的Apache Hadoop2.x，Pig here对期望的结果感到困惑。它检测到2.x版本，并尝试加载mr2样式的提交程序，但如果您使用MR1，则它将打印此嘈杂的警告，并回退到MR1，但仍能成功进行。错误后紧跟一条消息as或类似于org.apache.pig.backend.hadoop23.PigJobControl - falling back to default，指明这一点。