Question

嗨，我是hive的新手，我正在尝试在名为ConvertDateFormetUDF的hive中创建UDF。在创建临时功能时，我收到以下错误，请帮助我。可以采取一些步骤进行跟踪吗？请：

Hive> Add jar /home/cloudera/date.jar 
Added /home/cloudera/date.jar to class path
Added resource: /home/cloudera/date.jar
hive> CREATE TEMPORARY FUNCTION fun as 'com.db.acedq.opal.hive.ConvertDateFormatUDF';
java.lang.NoClassDefFoundError: org/apache/pig/EvalFunc
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)  
at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:247)
at org.apache.hadoop.hive.ql.exec.FunctionTask.getUdfClass(FunctionTask.java:105)
at org.apache.hadoop.hive.ql.exec.FunctionTask.createFunction(FunctionTask.java:75)
at org.apache.hadoop.hive.ql.exec.FunctionTask.execute(FunctionTask.java:63)
at org.apache.hadoop.hive.ql.exec.Task.executeTask(Task.java:138)
at org.apache.hadoop.hive.ql.exec.TaskRunner.runSequential(TaskRunner.java:57)
at org.apache.hadoop.hive.ql.Driver.launchTask(Driver.java:1374)
at org.apache.hadoop.hive.ql.Driver.execute(Driver.java:1160)
at org.apache.hadoop.hive.ql.Driver.run(Driver.java:973)
at org.apache.hadoop.hive.ql.Driver.run(Driver.java:893)
at org.apache.hadoop.hive.cli.CliDriver.processLocalCmd(CliDriver.java:259)
at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:216)
at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:412)
at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:759)
at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:613)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.util.RunJar.main(RunJar.java:208)
Caused by: java.lang.ClassNotFoundException: org.apache.pig.EvalFunc
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
... 32 more
FAILED: Execution Error, return code -101 from    org.apache.hadoop.hive.ql.exec.FunctionTask

Answer 1

看起来像你正在创建的UDF的java代码是指PIG库。在创建Hive UDF时，您应该包含配置单元库。我在以下链接http://lets-do-something-big.blogspot.in/2014/02/hive-udf-example.html中提到了整个过程。如果您仍然遇到问题，请告诉我

如何在Hive中创建UDF

1 个答案: