hadoop报错处理大全
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)