近日在做mapreduce数据在存储hbase中时，遇到错误：
org.apache.hadoop.yarn.exceptions.YarnRuntimeException: java.lang.RuntimeException: java.lang.ClassNotFoundException: Class org.apache.hadoop.hbase.mapreduce.TableOutputFormat not found
at org.apache.hadoop.mapreduce.v2.app.MRAppMaster$2.call(MRAppMaster.java:544)
at org.apache.hadoop.mapreduce.v2.app.MRAppMaster$2.call(MRAppMaster.java:524)
at org.apache.hadoop.mapreduce.v2.app.MRAppMaster.callWithJobClassLoader(MRAppMaster.java:1787)
at org.apache.hadoop.mapreduce.v2.app.MRAppMaster.createOutputCommitter(MRAppMaster.java:524)
at org.apache.hadoop.mapreduce.v2.app.MRAppMaster.serviceInit(MRAppMaster.java:310)
at org.apache.hadoop.service.AbstractService.init(AbstractService.java:164)
at org.apache.hadoop.mapreduce.v2.app.MRAppMaster$5.run(MRAppMaster.java:1745)
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:1893)
at org.apache.hadoop.mapreduce.v2.app.MRAppMaster.initAndStartAppMaster(MRAppMaster.java:1742)
at org.apache.hadoop.mapreduce.v2.app.MRAppMaster.main(MRAppMaster.java:1673)
Caused by: java.lang.RuntimeException: java.lang.ClassNotFoundException: Class org.apache.hadoop.hbase.mapreduce.TableOutputFormat not found
at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:2395)
at org.apache.hadoop.mapreduce.task.JobContextImpl.getOutputFormatClass(JobContextImpl.java:222)
at org.apache.hadoop.mapreduce.v2.app.MRAppMaster$2.call(MRAppMaster.java:540)
… 11 more
Caused by: java.lang.ClassNotFoundException: Class org.apache.hadoop.hbase.mapreduce.TableOutputFormat not found
at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:2299)
at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:2393)
… 13 more
2020-08-22 22:02:22,690 FATAL [main] org.apache.hadoop.mapreduce.v2.app.MRAppMaster: Error starting MRAppMaster
org.apache.hadoop.yarn.exceptions.YarnRuntimeException: java.lang.RuntimeException: java.lang.ClassNotFoundException: Class org.apache.hadoop.hbase.mapreduce.TableOutputFormat not found
at org.apache.hadoop.mapreduce.v2.app.MRAppMaster$2.call(MRAppMaster.java:544)
at org.apache.hadoop.mapreduce.v2.app.MRAppMaster$2.call(MRAppMaster.java:524)
at org.apache.hadoop.mapreduce.v2.app.MRAppMaster.callWithJobClassLoader(MRAppMaster.java:1787)
at org.apache.hadoop.mapreduce.v2.app.MRAppMaster.createOutputCommitter(MRAppMaster.java:524)
at org.apache.hadoop.mapreduce.v2.app.MRAppMaster.serviceInit(MRAppMaster.java:310)
at org.apache.hadoop.service.AbstractService.init(AbstractService.java:164)
at org.apache.hadoop.mapreduce.v2.app.MRAppMaster$5.run(MRAppMaster.java:1745)
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:1893)
at org.apache.hadoop.mapreduce.v2.app.MRAppMaster.initAndStartAppMaster(MRAppMaster.java:1742)
at org.apache.hadoop.mapreduce.v2.app.MRAppMaster.main(MRAppMaster.java:1673)
Caused by: java.lang.RuntimeException: java.lang.ClassNotFoundException: Class org.apache.hadoop.hbase.mapreduce.TableOutputFormat not found
at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:2395)
at org.apache.hadoop.mapreduce.task.JobContextImpl.getOutputFormatClass(JobContextImpl.java:222)
at org.apache.hadoop.mapreduce.v2.app.MRAppMaster$2.call(MRAppMaster.java:540)
… 11 more
Caused by: java.lang.ClassNotFoundException: Class org.apache.hadoop.hbase.mapreduce.TableOutputFormat not found
at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:2299)
at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:2393)
… 13 more
2020-08-22 22:02:22,694 INFO [main] org.apache.hadoop.util.ExitUtil: Exiting with status 1: org.apache.hadoop.yarn.exceptions.YarnRuntimeException: java.lang.RuntimeException: java.lang.ClassNotFoundException: Class org.apache.hadoop.hbase.mapreduce.TableOutputFormat not found
经过研究需要在在yarn-site.xml中配置如下信息：
```java
<property>
<name>yarn.application.classpath</name>
<value>
/opt/hadoop-2.10.0/etc/*,
/opt/hadoop-2.10.0/etc/hadoop/*,
/opt/hadoop-2.10.0/lib/*,
/opt/hadoop-2.10.0/share/hadoop/common/*,
/opt/hadoop-2.10.0/share/hadoop/common/lib/*,
/opt/hadoop-2.10.0/share/hadoop/mapreduce/*,
/opt/hadoop-2.10.0/share/hadoop/mapreduce/lib/*,
/opt/hadoop-2.10.0/share/hadoop/hdfs/*,
/opt/hadoop-2.10.0/share/hadoop/hdfs/lib/*,
/opt/hadoop-2.10.0/share/hadoop/yarn/*,
/opt/hadoop-2.10.0/share/hadoop/yarn/lib/*,
/opt/hbase-2.3.0/lib/*
</value>
</property>
设置hbase的lib路径即可