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

问题描述

我在启动 pig 脚本时遇到了 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

如果您使用的是 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.

之前我使用了以下依赖项:

Earlier I was using the following dependency:

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

当我把它改成:

<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.据我所知，原因是更高版本的 Hadoop 将 Counter 视为接口而不是类.所以我们不能创建 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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