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Hadoop常见问题排查

1. 系统防火墙

关闭 service iptables stop

2. NamenodeID冲突

delete folder defined in core-site.xml

format again

3. socket conflict

查看全部 netstat -tln

查看特殊 netstat -anp | grep 9000

kill uid

修改socket in core-site.xml mapred-site.xml

4. 查看日志

hadoop目录下logs