Cloudera Hadoop Class file for org.apache.hadoop.classification.InterfaceAudience not found

Question

這是我在嘗試編譯此WordCount.java文件時遇到的錯誤。

$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

添加hadoop-annotations-2.0.0-cdh4.0.1.jar到classpath

Answer 2

步驟我是如何解決這個問題：

1. 我創建了一個目錄中稱爲單詞計數（/home/cloudera/wordcount）。
2. 加入WordCount.java至/home/cloudera/wordcount目錄。

3. 目錄內我跑以下命令：

   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

Hadoop的2.6.0版，你需要添加下面的罐子：

的javac -classpath $ HADOOP_HOME /股/ Hadoop的/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

快速（但不建議用於生產）在Hadoop的2.6.x的是

的Unix/MacOS的

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

Answer 5

評論從POM下面的依賴，如果您有它

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

而且然後啓用hadoop-annotations