没有找到org.apache.hadoop.classification.InterfaceAudience的Cloudera Hadoop类文件

Question

这是我在尝试编译此WordCount.java文件时遇到的错误。

$javac -classpath /usr/lib/hadoop/hadoop-common-2.0.0-cdh4.0.1.jar:/usr/lib/hadoop/client/hadoop-mapreduce-client-core-2.0.0-cdh4.0.1.jar -d ~/wordcount /usr/lib/hadoop/wordcount_classes/WordCount.java
/usr/lib/hadoop/hadoop-common-2.0.0-cdh4.0.1.jar(org/apache/hadoop/fs/Path.class): 

warning: Cannot find annotation method 'value()' in type 'LimitedPrivate': class file for org.apache.hadoop.classification.InterfaceAudience not found
1 warning

Answer 1

将hadoop-annotations-2.0.0-cdh4.0.1.jar添加到类路径中

Answer 2

我如何解决这个问题的步骤：

1. 我创建了一个名为wordcount的目录（ /home/cloudera/wordcount ）。
2. 将WordCount.java添加到/home/cloudera/wordcount目录。

3. 在目录中我运行了以下命令：

    javac \\ -cp /usr/lib/hadoop/\\*:/usr/lib/hadoop/client-0.20/\\*:/usr/lib/hadoop/lib/\\* \\ WordCount.java -d /home/cloudera/wordcount/wordcount_classes 

Answer 3

对于Hadoop 2.6.0版，您需要添加以下jar：

javac -classpath $ HADOOP_HOME / share / hadoop / common / hadoop-common-2.6.0.jar：$ HADOOP_HOME / share / hadoop / common / lib / hadoop-annotations-2.6.0.jar：$ HADOOP_HOME / share / hadoop / mapreduce / hadoop-mapreduce-client-core-2.6.0.jar /path_to_your_java_file/WordCount.java

Answer 4

hadoop-2.6.x中的快速（但不建议生产）是

在Unix / MacOS的

$ javac -classpath .:$(mapred classpath):$CLASSPATH -d ~/wordcount /usr/lib/hadoop/wordcount_classes/WordCount.java

Answer 5

如果你有pom，请从pom中注释下面的依赖关系

    <dependency>
        <groupId>org.apache.hive</groupId>
        <artifactId>hive-exec</artifactId>
        <version>1.2.1</version>
    </dependency>

然后启用hadoop-annotations