hadoop常见问题解决
我的CSDN博客地址：http://blog.csdn.net/qidong7
常见问题解决：
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WARNmapred.LocalJobRunner:job_local910166057_0001
org.apache.hadoop.security.AccessControlException:org.apache.hadoop.security.AccessControlException:Permissiondenied:user=***,access=WRITE,inode="wordcount":root:supergroup:rwxr-xr-x
sulution：addedthisentrytoconf/hdfs-site.xml
<property>
<name>dfs.permissions</name>
<value>false</value>
</property>
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ERRORorg.apache.hadoop.hdfs.server.namenode.SafeModeException:
Cannotcreate/mapreduce/wordcount/output/1.Namenodeisin
safemode.
代码中添加
conf.set("dfs.permissions","false");
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ERRORsecurity.UserGroupInformation:PriviledgedActionExceptionas:bc_qicause:org.apache.hadoop.mapred.FileAlreadyExistsException:Outputdirectory/mapreduce/wordcount/output/1alreadyexists
执行
hadoopfs-rmr/mapreduce/wordcount/output
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提示连不上50010端口；
查看是不是防火墙的原因。
照样子添加/etc/sysconfig/iptables端口过滤
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