hadoop报错处理大全

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hadoop error

 

 

error 1 java.net.ConnectException

java.io.IoException: java.net.ConnectException: Call From cnq/192.168.40.141 to 0.0.0.0:100020

failed on connection exception: java.net.ConnectException: 拒绝连接: For more datails see: http://wiki.appche.org/hadoop/ConnectionRefused

 

 

solution 1

sbin/mr-jobhistory-daemon.sh --config /usr/java/hadoop/etc/hadoop start historyserver

（启动jobhistory服务，注：/usr/java/hadoop/etc/hadoop是hadoop存放配置文件的地址。例如存放:core-site.xml）

 

 

 

error 2 org.apache.hadoop.ipc.RemoteException

org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.hdfs.server.namenode.Saf                                                                                                                                                             eModeException): Cannot delete /tmp/hadoop-yarn/staging/root/.staging/job_151557                                                                                                                                                             1439496_0001. Name node is in safe mode.

 

solution 2

bin/hadoop dfsadmin -safemode leave           （解除安全模式）

 

 

 

error 3

 

网页上打开50070查看集群显示网页不存在

 

 

solution 3

 

systemctl stop firewalld.service（关闭防火墙，centos7）

sudo ufw disable   （关闭防火墙，ubuntu）