Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/hadoop/hive/ql/CommandNeedRetr

问题如下：

[hadoop@gpmaster hadoop]$ hive

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/hadoop/hive/ql/CommandNeedRetryException

at java.lang.Class.forName0(Native Method)

at java.lang.Class.forName(Class.java:270)

at org.apache.hadoop.util.RunJar.run(RunJar.java:214)

at org.apache.hadoop.util.RunJar.main(RunJar.java:136)

Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.hive.ql.CommandNeedRetryException

at java.net.URLClassLoader$1.run(URLClassLoader.java:366)

at java.net.URLClassLoader$1.run(URLClassLoader.java:355)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(URLClassLoader.java:354)

at java.lang.ClassLoader.loadClass(ClassLoader.java:425)

at java.lang.ClassLoader.loadClass(ClassLoader.java:358)

... 4 more

[hadoop@gpmaster hadoop]$

分析并解决方法如下：

我之前使用Tachyon作为分布式内存存储时，在Hadoop的配置文件hadoop-env.sh中，添加了如下内容：

export HADOOP_CLASSPATH=/home/hadoop/tachyon-0.7.1/clients/client/target/tachyon-client-0.7.1-jar-with-dependencies.jar

但是这样配置会覆盖掉HADOOP_CLASSPATH变量原本的信息，所以应该修改为：

export HADOOP_CLASSPATH=/home/hadoop/tachyon-0.7.1/clients/client/target/tachyon-client-0.7.1-jar-with-dependencies.jar:$HADOOP_CLASSPATH