Error, return code 2 from org.apache.hadoop.hive.ql.exec.mr.MapRedTask

hive运行查询语句时报错：

Error: org.apache.hive.service.cli.HiveSQLException: Error while processing statement: 

FAILED: Execution Error, return code 2 from org.apache.hadoop.hive.ql.exec.mr.MapRedTask
	at org.apache.hive.service.cli.operation.Operation.toSQLException

(Operation.java:380)
	at org.apache.hive.service.cli.operation.SQLOperation.runQuery

(SQLOperation.java:257)
	at org.apache.hive.service.cli.operation.SQLOperation.access$800

(SQLOperation.java:91)
	at org.apache.hive.service.cli.operation.SQLOperation$BackgroundWork$1.run

(SQLOperation.java:348)
	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:1628)
	at org.apache.hive.service.cli.operation.SQLOperation$BackgroundWork.run

(SQLOperation.java:362)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745) (state=08S01,code=2)

不要慌，看日志，什么出错了？

打开浏览器：http://192.168.1.24:8042/logs/yarn-root-resourcemanager-bigboss2.log

找到错误：System times on machines may be out of sync. Check system time and time zones.

Note: System times on machines may be out of sync. Check system time and time zones.
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance

(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance

(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:408)
	at 

org.apache.hadoop.yarn.api.records.impl.pb.SerializedExceptionPBImpl.instantiateException

(SerializedExceptionPBImpl.java:168)
	at 

org.apache.hadoop.yarn.api.records.impl.pb.SerializedExceptionPBImpl.deSerialize

(SerializedExceptionPBImpl.java:106)
	at org.apache.hadoop.yarn.server.resourcemanager.amlauncher.AMLauncher.launch

(AMLauncher.java:123)
	at org.apache.hadoop.yarn.server.resourcemanager.amlauncher.AMLauncher.run

(AMLauncher.java:254)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)

小意思，时间不一致问题；

yum -y install ntp ntpdate

ntpdate cn.pool.ntp.org

hwclock --systohc