hive连接远程hadoopj报ava.net.UnknownHostException:

在通过hive客户端连接远程时报错，java.net.UnknownHostException:

 

具体如下：

hive> select count(1) from tlbb.consume_log;
Total MapReduce jobs = 1
Launching Job 1 out of 1
Number of reduce tasks determined at compile time: 1
In order to change the average load for a reducer (in bytes):
  set hive.exec.reducers.bytes.per.reducer=<number>
In order to limit the maximum number of reducers:
  set hive.exec.reducers.max=<number>
In order to set a constant number of reducers:
  set mapred.reduce.tasks=<number>
java.net.UnknownHostException: WEB_75.94: WEB_75.94
        at java.net.InetAddress.getLocalHost(InetAddress.java:1354)
        at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:866)
        at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:842)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:396)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1059)
        at org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:842)
        at org.apache.hadoop.mapred.JobClient.submitJob(JobClient.java:816)
        at org.apache.hadoop.hive.ql.exec.ExecDriver.execute(ExecDriver.java:452)
        at org.apache.hadoop.hive.ql.exec.MapRedTask.execute(MapRedTask.java:136)
        at org.apache.hadoop.hive.ql.exec.Task.executeTask(Task.java:133)
        at org.apache.hadoop.hive.ql.exec.TaskRunner.runSequential(TaskRunner.java:57)
        at org.apache.hadoop.hive.ql.Driver.launchTask(Driver.java:1332)
        at org.apache.hadoop.hive.ql.Driver.execute(Driver.java:1123)
        at org.apache.hadoop.hive.ql.Driver.run(Driver.java:931)
        at org.apache.hadoop.hive.cli.CliDriver.processLocalCmd(CliDriver.java:255)
        at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:212)
        at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:403)
        at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:671)
        at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:554)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.hadoop.util.RunJar.main(RunJar.java:156)
Job Submission failed with exception 'java.net.UnknownHostException(WEB_75.94: WEB_75.94)'
FAILED: Execution Error, return code 1 from org.apache.hadoop.hive.ql.exec.MapRedTask

 

    开始判断，认为master节点可能需要配置当前客户端的hostname，但是配置后仍然报该错误。原本已经在该客户端配置了master节点的host，难道还需要各从节点的 hostname ？把各从节点的 hostname 也配置了，还是报错。

   最后尝试，在客户端机器上配置了当前hostname，结果就可以了。配置hostname命令如下（需要使用root用户）：

hostname XXXXX