我创建了自己的udfjar，当我在本地模式下运行pig时，一切正常。udfjar存储在本地fs上。
当我在mapreduce模式（-x mapreduce）下执行pig脚本，并且udfjar也放在本地fs中时，我得到了下面的错误。你能告诉我怎么了吗？我是否也必须将udf jar放入hdfs？

Pig Stack Trace
---------------
ERROR 1066: Unable to open iterator for alias sourceData

org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1066: Unable to open iterator for alias sourceData
        at org.apache.pig.PigServer.openIterator(PigServer.java:935)
        at org.apache.pig.tools.grunt.GruntParser.processDump(GruntParser.java:746)
        at org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:372)
        at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:230)
        at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:205)
        at org.apache.pig.tools.grunt.Grunt.run(Grunt.java:66)
        at org.apache.pig.Main.run(Main.java:558)
        at org.apache.pig.Main.main(Main.java:170)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.apache.hadoop.util.RunJar.run(RunJar.java:221)
        at org.apache.hadoop.util.RunJar.main(RunJar.java:136)
Caused by: java.io.IOException: Job terminated with anomalous status FAILED
        at org.apache.pig.PigServer.openIterator(PigServer.java:927)
        ... 13 more
================================================================================

更新：
如果我在mapreduce模式下执行pig脚本（如下所示），一切正常：
sd=负载'hdfs://default：8020/hdfs/customerdata.csv'使用pigstorage（'；'）as（姓名：chararray，客户ID:chararray，vin:chararray，出生日期：chararray，里程：int，油耗：double）；
转储sd；
但是，当我在开始时包含我的udf函数时，甚至我都不调用/使用它，当我执行脚本时，我得到了迭代器错误。
register/root/myudf.jar；
sd=负载'hdfs://default：8020/hdfs/customerdata.csv'使用pigstorage（'；'）as（姓名：chararray，客户ID:chararray，vin:chararray，出生日期：chararray，里程：int，油耗：double）；
转储sd；
我应该提供自定义项代码吗？
更新2：这是我从Yarn日志中得到的

2016-03-01 11:31:33,399 INFO [main] org.apache.hadoop.mapreduce.v2.app.MRAppMaster: OutputCommitter set in config null
2016-03-01 11:31:33,443 FATAL [main] org.apache.hadoop.mapreduce.v2.app.MRAppMaster: Error starting MRAppMaster
java.lang.IncompatibleClassChangeError: Found interface org.apache.hadoop.mapreduce.JobContext, but class was expected
        at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigOutputFormat.setupUdfEnvAndStores(PigOutputFormat.java:225)
        at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigOutputFormat.getOutputCommitter(PigOutputFormat.java:275)
        at org.apache.hadoop.mapreduce.v2.app.MRAppMaster$1.call(MRAppMaster.java:470)
        at org.apache.hadoop.mapreduce.v2.app.MRAppMaster$1.call(MRAppMaster.java:452)
        at org.apache.hadoop.mapreduce.v2.app.MRAppMaster.callWithJobClassLoader(MRAppMaster.java:1541)
        at org.apache.hadoop.mapreduce.v2.app.MRAppMaster.createOutputCommitter(MRAppMaster.java:452)
        at org.apache.hadoop.mapreduce.v2.app.MRAppMaster.serviceInit(MRAppMaster.java:371)
        at org.apache.hadoop.service.AbstractService.init(AbstractService.java:163)
        at org.apache.hadoop.mapreduce.v2.app.MRAppMaster$4.run(MRAppMaster.java:1499)
        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:1628)
        at org.apache.hadoop.mapreduce.v2.app.MRAppMaster.initAndStartAppMaster(MRAppMaster.java:1496)
        at org.apache.hadoop.mapreduce.v2.app.MRAppMaster.main(MRAppMaster.java:1429)
2016-03-01 11:31:33,457 INFO [main] org.apache.hadoop.util.ExitUtil: Exiting with status 1

我仍然得到错误：

2016-03-07 14:29:48,625 FATAL [main] org.apache.hadoop.mapreduce.v2.app.MRAppMaster: Error starting MRAppMaster
java.lang.IncompatibleClassChangeError: Found interface org.apache.hadoop.mapreduce.JobContext, but class was expected
        at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigOutputFormat.setupUdfEnvAndStores(PigOutputFormat.java:235)
        at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigOutputFormat.getOutputCommitter(PigOutputFormat.java:285)
        at org.apache.hadoop.mapreduce.v2.app.MRAppMaster$1.call(MRAppMaster.java:470)
        at org.apache.hadoop.mapreduce.v2.app.MRAppMaster$1.call(MRAppMaster.java:452)
        at org.apache.hadoop.mapreduce.v2.app.MRAppMaster.callWithJobClassLoader(MRAppMaster.java:1541)
        at org.apache.hadoop.mapreduce.v2.app.MRAppMaster.createOutputCommitter(MRAppMaster.java:452)
        at org.apache.hadoop.mapreduce.v2.app.MRAppMaster.serviceInit(MRAppMaster.java:371)
        at org.apache.hadoop.service.AbstractService.init(AbstractService.java:163)
        at org.apache.hadoop.mapreduce.v2.app.MRAppMaster$4.run(MRAppMaster.java:1499)
        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:1628)
        at org.apache.hadoop.mapreduce.v2.app.MRAppMaster.initAndStartAppMaster(MRAppMaster.java:1496)
        at org.apache.hadoop.mapreduce.v2.app.MRAppMaster.main(MRAppMaster.java:1429)
2016-03-07 14:29:48,628 INFO [main] org.apache.hadoop.util.ExitUtil: Exiting with status 1