ipc.Client: Retrying connect to server: .../10.0.0.27:10020. Already tried 6 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)

运行 时候爆出这个错

Exception in thread "main" java.io.IOException: java.net.ConnectException: Call From hadoop.slave01/192.168.121.133 to 0.0.0.0:10020 failed on connection exception: java.net.ConnectException: Connection refused; For more details see:  http://wiki.apache.org/hadoop/ConnectionRefused
	at org.apache.hadoop.mapred.ClientServiceDelegate.invoke(ClientServiceDelegate.java:344)
	at org.apache.hadoop.mapred.ClientServiceDelegate.getJobStatus(ClientServiceDelegate.java:429)
	at org.apache.hadoop.mapred.YARNRunner.getJobStatus(YARNRunner.java:601)
	at org.apache.hadoop.mapreduce.Job$1.run(Job.java:323)
	at org.apache.hadoop.mapreduce.Job$1.run(Job.java:320)
	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:1758)
	at org.apache.hadoop.mapreduce.Job.updateStatus(Job.java:320)
	at org.apache.hadoop.mapreduce.Job.isComplete(Job.java:604)
	at org.apache.hadoop.mapreduce.Job.monitorAndPrintJob(Job.java:1349)
	at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1311)
	at com.mr.wordcount.WordcountDriver.main(WordcountDriver.java:32)
FinalApplicationStatus=SUCCEEDED. Redirecting to job history server
ipc.Client: Retrying connect to server: hadoop-master/10.0.0.27:10020. Already tried 6 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)

　　

　　

要开启 sbin下面的 historyserver

mr-jobhistory-daemon.sh start historyserver

　　

这个开启有点慢要等等；然后查看10200监听端口

netstat -an | grep 10020　　

直到看到，下面监听成功