hadoop - hcatalog 与 mapreduce

Question

我在执行 MapReduce 程序时遇到以下错误。我已将所有 jar 放在 hadoop/lib 目录中，并且还在 -libjars 中提到了这些 jar。

这是我正在执行的命令:

$HADOOP_HOME/bin/hadoop --config $HADOOP_HOME/conf jar /home/shash/distinct.jar  HwordCount -libjars $LIB_JARS WordCount HWordCount2

java.lang.RuntimeException: java.lang.ClassNotFoundException: 
org.apache.hcatalog.mapreduce.HCatOutputFormat at 
org.apache.hadoop.conf.Configuration.getClass(Configuration.java:996) at 
org.apache.hadoop.mapreduce.JobContext.getOutputFormatClass(JobContext.java:248) at org.apache.hadoop.mapred.Task.initialize(Task.java:501) at 
org.apache.hadoop.mapred.MapTask.run(MapTask.java:306) at org.apache.hadoop.mapred.Child$4.run(Child.java:270) at 
java.security.AccessController.doPrivileged(Native Method) at 
javax.security.auth.Subject.doAs(Subject.java:415) at 
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1127) at 
org.apache.hadoop.mapred.Child.main(Child.java:264) Caused by: java.lang.ClassNotFoundException: org.apache.hcatalog.mapreduce.HCatOutputFormat 
at java.net.URLClassLoader$1.run(URLClassLoader.java:366) at 
java.net.URLClassLoader$1.run(URLClassLoader.java:355) at 
java.security.AccessController.doPrivileged(Native Method) at 
java.net.URLClassLoader.findClass(URLClassLoader.java:354) at 
java.lang.ClassLoader.loadClass(ClassLoader.java:423) at 
sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at 
java.lang.ClassLoader.loadClass(ClassLoader.java:356) at 
java.lang.Class.forName0(Native Method) at 
java.lang.Class.forName(Class.java:264) at 
org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:943) 
at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:994) ... 
8 more

Answer 1

确保 LIB_JARS 是一个以逗号分隔的列表(而不是像 CLASSPATH 那样以冒号分隔)