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https://issues.apache.org/jira/browse/MAPREDUCE-890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12745784#action_12745784
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Vinod K V commented on MAPREDUCE-890:
-------------------------------------
In other words, the problem is the following:
{code}
$ mkdir testing
$ ls -ld testing/
drwxr-xr-x 2 vinodkv vinodkv 4096 2009-08-21 09:54 testing/
$ touch testing/t1.txt
$ echo $?
0
$ chmod 0570 testing/
$ ls -ld testing/
dr-xrwx--- 2 vinodkv vinodkv 4096 2009-08-21 09:54 testing/
$ touch testing/t2.txt
touch: cannot touch `testing/t2.txt': Permission denied
{code}
I searched and hunted this down in the Linux Kernel filesystem code:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob;f=fs/namei.c;h=f3c5b278895a0d3e0f23fe6fd474e2728a1c6cb6;hb=6c30c53fd5ae6a99a23ad78e90c428d2c8ffb07f
. Particularly the generic_permission() function where we check if
current_fsuid() == inode->i_uid.
> After HADOOP-4491, the user who started mapred system is not able to run job.
> -----------------------------------------------------------------------------
>
> Key: MAPREDUCE-890
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-890
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: tasktracker
> Reporter: Karam Singh
> Assignee: Vinod K V
>
> Even setup and cleanup task of job fails due exception -: It fails to create
> job and related directories under mapred.local.dir/taskTracker/jobcache
> Directories are created as -:
> [dr-xrws--- mapred hadoop ] job_200908190916_0002
> mapred is not wrtie under this. Even manually I failed to touch file.
> mapred is use of started mr cluster
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