Java.net. ConnectException: to0.0.0.0: 10020 failed

When selectcount (*) fromtable_name is executed in HiveCLI on the DataNode node, the following error occurs: java. io. IOException: java.net. ConnectException: Failed: 10020 failedonconnectionexception: java.net. ConnectException:

If you run select count (*) from table_name query in Hive CLI of the DataNode node, the following error occurs: java. io. IOException: java.net. connectException: Call From Slave7.Hadoop/192.168.8.207 to 0.0.0.0: 10020 failed on connection exception: java.net. connectException:

An error is returned when you execute select count (*) from table_name query in Hive CLI of the DataNode node:

java.io.IOException: java.net.ConnectException: Call From Slave7.Hadoop/192.168.8.207 to 0.0.0.0:10020 failed on connection exception: java.net.ConnectException: Connection refused; For more details see:  http://wiki.apache.org/hadoop/ConnectionRefusedat org.apache.hadoop.mapred.ClientServiceDelegate.invoke(ClientServiceDelegate.java:331)at org.apache.hadoop.mapred.ClientServiceDelegate.getJobStatus(ClientServiceDelegate.java:416)at org.apache.hadoop.mapred.YARNRunner.getJobStatus(YARNRunner.java:522)at org.apache.hadoop.mapreduce.Cluster.getJob(Cluster.java:183)at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:580)at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:578)at java.security.AccessController.doPrivileged(Native Method)at javax.security.auth.Subject.doAs(Subject.java:416)at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1491)at org.apache.hadoop.mapred.JobClient.getJobUsingCluster(JobClient.java:578)at org.apache.hadoop.mapred.JobClient.getJob(JobClient.java:596)at org.apache.hadoop.hive.ql.exec.mr.HadoopJobExecHelper.progress(HadoopJobExecHelper.java:288)at org.apache.hadoop.hive.ql.exec.mr.HadoopJobExecHelper.progress(HadoopJobExecHelper.java:547)at org.apache.hadoop.hive.ql.exec.mr.ExecDriver.execute(ExecDriver.java:426)at org.apache.hadoop.hive.ql.exec.mr.MapRedTask.execute(MapRedTask.java:136)at org.apache.hadoop.hive.ql.exec.Task.executeTask(Task.java:153)at org.apache.hadoop.hive.ql.exec.TaskRunner.runSequential(TaskRunner.java:85)at org.apache.hadoop.hive.ql.Driver.launchTask(Driver.java:1472)at org.apache.hadoop.hive.ql.Driver.execute(Driver.java:1239)at org.apache.hadoop.hive.ql.Driver.runInternal(Driver.java:1057)at org.apache.hadoop.hive.ql.Driver.run(Driver.java:884)at org.apache.hadoop.hive.ql.Driver.run(Driver.java:874)at org.apache.hadoop.hive.cli.CliDriver.processLocalCmd(CliDriver.java:268)at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:220)at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:423)at org.apache.hadoop.hive.cli.CliDriver.executeDriver(CliDriver.java:792)at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:686)at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:625)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:616)at org.apache.hadoop.util.RunJar.main(RunJar.java:212)

Access the port from the error message 10020Can we see that DataNode needs to be accessed? MapReduce JobHistory Server. If it is not modified, use the default value :? 0.0.0.0:10020 . Need to modify the configuration file? mapred-site.xml?? :

 
  
   
Mapreduce. jobhistory. address
          
  
  
   
Master. Hadoop: 10020
  
 

Then execute the query in Hive shell. ------? EOF? @ Michael Sun? ------

Original article address: java.net. ConnectException: to 0.0.0.0: 10020 failed. Thank you for sharing it with me.