CDH4-异常:java.lang.IncompatibleClassChangeError: [英] CDH4 - Exception: java.lang.IncompatibleClassChangeError:

问题描述

启动Pig脚本时出现Java问题，似乎是某些依赖项或版本冲突，正在运行Debian/Cloudera CDH4/Apache Pig

I am getting a java issue when I launch a pig script, it appears to be some dependency or version conflict, Running Debian/Cloudera CDH4/ Apache Pig

java.lang.Exception: java.lang.IncompatibleClassChangeError: Found interface org.apache.hadoop.mapreduce.Counter, but class was expected

at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:406)
Caused by: java.lang.IncompatibleClassChangeError: Found interface org.apache.hadoop.mapreduce.Counter, but class was expected

推荐答案

如果使用的是Maven，则需要在POM文件中进行更改.

If you are using Maven, you need to make changes in the POM File.

我以前使用的是以下依赖项:

Earlier I was using the following dependency:

<dependency>
    <groupId>org.apache.hadoop</groupId>
    <artifactId>hadoop-core</artifactId>
    <version>1.2.1</version>
</dependency>

当我将其更改为:

<dependency>
    <groupId>org.apache.hadoop</groupId>
    <artifactId>hadoop-client</artifactId>
    <version>2.5.2</version>
</dependency>

我认为这可能会有所帮助.据我说，原因是Hadoop的更高版本将Counter视为Interface而不是Class.因此，我们无法创建Counter的对象.

I think this might help. The reason, according to me, is that the later version of Hadoop treats Counter as Interface and not a class. So we cannot create an object of the Counter.

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