hadoop 2.3.0 打不开history server文件的问题

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本文讨论了在MapReduce作业中遇到的历史文件访问权限问题，并提供了将Mapred用户加入到超级用户组的解决方案，确保历史文件在作业运行过程中能够被正确访问。

Error message looks like this:

Couldnot load history file hdfs://namenodeha:8020/mr-history/tmp/hdfs/job_1392049860497_0005-1392129567754-hdfs-word+count-1392129599308-1-1-SUCCEEDED-default.jhist

Actually, I know the answer to the problem. The defaul settings of /mr-history files is:

hadoop fs -chown -R $MAPRED_USER:$HDFS_USER /mr-history

But when running a job (under $HDFS_USER), job file is saved to /mr-history/tmp/hdfs under $HDFS_USER:$HDFS_USER and then not accessible to $MAPRED_USER (where JobHistory server is running). After changing the permissions back again the job file can be load.

But it is happening again with every new job. So can someone help me, what is the pernament solution to this, thank you.

I ran into the same problem. As a workaround I added the $MAPRED_USER user to the $HDFS_USER group, it helped.

我qeekey

的解决办法办，把mapred这个用户加入到 supergroup组，这样它就有权限读其它人生成的日志了。

groupadd supergroup

usermod -a -G supergroup mapred