hadoop - pig java.lang.NoSuchFieldException : jobsInProgress exception

Question

我将 pig-0.11.0+28 与 CDH4 一起使用，当我运行任何 Pig 作业时，我都会遇到此异常。我也发生在本地模式下。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 WARN 在运行时是无害的。

Pig 旨在与许多版本一起工作。

自从 CDH4 发布带有 MR1 (0.20/1.x) MR 框架选项的 Apache Hadoop 2.x 以来，这里的 Pig 对预期的内容感到困惑。它检测到 2.x 版本并尝试加载 MR2 样式的提交程序，但是如果您使用 MR1，那么它会打印这个嘈杂的 WARN 并回退到 MR1 并仍然成功进行。错误后跟一条类似于或类似于 org.apache.pig.backend.hadoop23.PigJobControl - falling back to default 的消息，表明了这一点。