当我尝试运行mapreduce作业时，出现以下异常
2021-03-20 11:56:30171 info[main]org.apache.hadoop.service.abstractservice:服务org.apache.hadoop.mapreduce.v2.app.mrappmaster在初始化状态下失败；原因：org.apache.hadoop.yarn.exceptions.yarnruntimeexception:java.lang.runtimeexception:java.lang.classnotfoundexception:class org.apache.orc.mapreduce.orcouputformat找不到org.apache.hadoop.yarn.exceptions.yarnruntimeexception:java.lang.runtimeexception:java.lang.classnotfoundexception:class org.apache.orc.mapreduce.orcouputformat在org.apache.hadoop.mapreduce.v2.app.mrappmaster$2.call（mrappmaster）中找不到。java:541)在org.apache.hadoop.mapreduce.v2.app.mrappmaster$2.call（mrappmaster。java:521)在org.apache.hadoop.mapreduce.v2.app.mrappmaster.callwithjobclassloader（mrappmaster。java:1695)在org.apache.hadoop.mapreduce.v2.app.mrappmaster.createoutputcommitter（mrappmaster。java:521)在org.apache.hadoop.mapreduce.v2.app.mrappmaster.serviceinit（mrappmaster。java:307)在org.apache.hadoop.service.abstractservice.init（abstractservice。java:163)在org.apache.hadoop.mapreduce.v2.app.mrappmaster$5.run（mrappmaster。java:1653)在javax.security.auth.subject.doas（主题）中的java.security.accesscontroller.doprivileged（本机方法）。java:422)在org.apache.hadoop.security.usergroupinformation.doas（usergroupinformation。java:1844)在org.apache.hadoop.mapreduce.v2.app.mrappmaster.initandstartapmaster（mrappmaster。java:1650)在org.apache.hadoop.mapreduce.v2.app.mrappmaster.main（mrappmaster.com）。java:1583)原因：java.lang.runtimeexception:java.lang.classnotfoundexception:class org.apache.orc.mapreduce.orcoutputformat未在org.apache.hadoop.conf.configuration.getclass（configuration）中找到。java:2369)在org.apache.hadoop.mapreduce.task.jobcontextimpl.getoutputformatclass（jobcontextimpl。java:223)在org.apache.hadoop.mapreduce.v2.app.mrappmaster$2.call（mrappmaster。java:538) ... 11更多原因：java.lang.classnotfoundexception:在org.apache.hadoop.conf.configuration.getclassbyname（配置）中找不到类org.apache.orc.mapreduce.orcoutputformat。java:2273)在org.apache.hadoop.conf.configuration.getclass（configuration。java:2367) ... 13个以上
在运行mapreduce之前，我使用命令

export HADOOP_CLASSPATH=/usr/lib/hadoop/*:/tmp/vg/libs/*:$(hbase classpath)

/tmp/vg/libs包含jar，它包含org.apache.orc.mapreduce.orcouputformat类
有什么问题？