在hdp2.3forwindows的apache pig交互式shell中工作时，我在 /path/to/file . 如果我加载并保存它，使用：

a = LOAD '/path/to/file' USING OrcStorage('');
STORE a INTO '/path/to/second_file' USING OrcStorage('');

然后一切正常。但是，如果我尝试：

a = LOAD '/path/to/file' USING OrcStorage('');
b = LIMIT a 10;
STORE b INTO '/path/to/third_file' USING OrcStorage('');

然后，我在第二个作业的日志中得到以下错误回溯（在它安排的两个作业中）：

2015-08-25 16:03:42,161 FATAL [main] org.apache.hadoop.mapreduce.v2.app.MRAppMaster: Error starting MRAppMaster
java.lang.NoClassDefFoundError: org/apache/hadoop/hive/ql/io/orc/OrcNewOutputFormat
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:348)
    at org.apache.pig.impl.PigContext.resolveClassName(PigContext.java:657)
    at org.apache.pig.impl.PigContext.instantiateFuncFromSpec(PigContext.java:726)
    at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POStore.getStoreFunc(POStore.java:251)
    at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigOutputCommitter.getCommitters(PigOutputCommitter.java:88)
    at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigOutputCommitter.<init>(PigOutputCommitter.java:71)
    at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigOutputFormat.getOutputCommitter(PigOutputFormat.java:289)
    at org.apache.hadoop.mapreduce.v2.app.MRAppMaster$1.call(MRAppMaster.java:476)
    at org.apache.hadoop.mapreduce.v2.app.MRAppMaster$1.call(MRAppMaster.java:458)
    at org.apache.hadoop.mapreduce.v2.app.MRAppMaster.callWithJobClassLoader(MRAppMaster.java:1560)
    at org.apache.hadoop.mapreduce.v2.app.MRAppMaster.createOutputCommitter(MRAppMaster.java:458)
    at org.apache.hadoop.mapreduce.v2.app.MRAppMaster.serviceInit(MRAppMaster.java:377)
    at org.apache.hadoop.service.AbstractService.init(AbstractService.java:163)
    at org.apache.hadoop.mapreduce.v2.app.MRAppMaster$4.run(MRAppMaster.java:1518)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.security.auth.Subject.doAs(Subject.java:422)
    at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657)
    at org.apache.hadoop.mapreduce.v2.app.MRAppMaster.initAndStartAppMaster(MRAppMaster.java:1515)
    at org.apache.hadoop.mapreduce.v2.app.MRAppMaster.main(MRAppMaster.java:1448)
Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.hive.ql.io.orc.OrcNewOutputFormat
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

我怀疑这两个作业的类路径是不同的，从而导致类未找到。可能是这样吗？如果是的话，我该怎么修(附加问题：为什么会发生这种情况？）