HIVE on tez 设置问题，请大神解答

hadoop 2.6.0 + hive 2.0.1 用hive on tez报错，跪求解答：
java.lang.NoClassDefFoundError: org/apache/tez/serviceplugins/api/TaskScheduler
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at org.apache.hadoop.hive.ql.exec.tez.TezSessionState.<clinit>(TezSessionState.java:93)
at org.apache.hadoop.hive.ql.exec.tez.TezSessionPoolManager.createAndInitSession(TezSessionPoolManager.java:209)
at org.apache.hadoop.hive.ql.exec.tez.TezSessionPoolManager.getNewSessionState(TezSessionPoolManager.java:258)
at org.apache.hadoop.hive.ql.exec.tez.TezSessionPoolManager.getSession(TezSessionPoolManager.java:238)
at org.apache.hadoop.hive.ql.exec.tez.TezSessionPoolManager.getSession(TezSessionPoolManager.java:415)
at org.apache.hadoop.hive.ql.exec.tez.TezSessionPoolManager.getSession(TezSessionPoolManager.java:343)
at org.apache.hadoop.hive.ql.exec.tez.TezTask.execute(TezTask.java:133)
at org.apache.hadoop.hive.ql.exec.Task.executeTask(Task.java:158)
at org.apache.hadoop.hive.ql.exec.TaskRunner.runSequential(TaskRunner.java:101)
at org.apache.hadoop.hive.ql.Driver.launchTask(Driver.java:1834)
at org.apache.hadoop.hive.ql.Driver.execute(Driver.java:1578)
at org.apache.hadoop.hive.ql.Driver.runInternal(Driver.java:1355)
at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1178)
at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1166)
at org.apache.hadoop.hive.cli.CliDriver.processLocalCmd(CliDriver.java:236)
at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:187)
at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:403)
at org.apache.hadoop.hive.cli.CliDriver.executeDriver(CliDriver.java:782)
at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:721)
at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:648)
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.main(RunJar.java:212)
Caused by: java.lang.ClassNotFoundException: org.apache.tez.serviceplugins.api.TaskScheduler
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
... 37 more
FAILED: Execution Error, return code -101 from org.apache.hadoop.hive.ql.exec.tez.TezTask. org/apache/tez/serviceplugins/api/TaskScheduler