Jobtracker sets permissions on mapred.system.dir to 700 preventing
non-superusers from submitting jobs to multi-user cluster
----------------------------------------------------------------------------------------------------------------------------
Key: MAPREDUCE-3470
URL: https://issues.apache.org/jira/browse/MAPREDUCE-3470
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: jobtracker
Affects Versions: 0.20.205.0
Environment: Debian 6.0 x64_64
java version "1.6.0_26"
Java(TM) SE Runtime Environment (build 1.6.0_26-b03)
Java HotSpot(TM) 64-Bit Server VM (build 20.1-b02, mixed mode)
Reporter: stephen mulcahy
(See thread discussing here -
https://mail-archives.apache.org/mod_mbox/hadoop-common-user/201111.mbox/%[email protected]%3E)
I have installed a hadoop 0.20.205.0 cluster for use by multiple users, each of
which will submit their jobs from remote client systems. I have disabled
security
<property>
<name>hadoop.security.authorization</name>
<value>false</value>
</property>
<property>
<name>hadoop.security.authentication</name>
<value>simple</value>
</property>
When a user other than super-user attempts to submit a job, they get the
following error
11/11/09 16:32:53 INFO mapred.FileInputFormat: Total input paths to process : 2
11/11/09 16:32:53 INFO mapred.JobClient: Running job: job_201111091731_0003
11/11/09 16:32:54 INFO mapred.JobClient: map 0% reduce 0%
11/11/09 16:32:54 INFO mapred.JobClient: Job complete: job_201111091731_0003
11/11/09 16:32:54 INFO mapred.JobClient: Counters: 0
11/11/09 16:32:54 INFO mapred.JobClient: Job Failed: Job initialization failed:
org.apache.hadoop.security.AccessControlException:
org.apache.hadoop.security.AccessControlException: Permission denied:
user=smulcahy, access=EXECUTE, inode="system":hadoop:supergroup:rwx------
.....
which seems to be due to not being able to create a jobToken file in
<mapred.system.dir>/<job id>/jobToken
I can reset the permissions on mapred.system.dir to something like 777 but when
I restart the jobtracker, it resets the permissions back to 700, requiring
another permissions reset.
This gives rise to a few questions,
1. Should I be able to use a hadoop cluster in this fashion or is this not
supported (if not, supported, I guess close this bug as invalid). If it is not
supported, it reduces the usability of hadoop for a class of users like myself
(but maybe thats a small class).
2. If I should be able to use the cluster like this, should
<mapred.system.dir>/<job id>/jobToken need to be created if security is
disabled? If no, then I guess is the bug that needs to be fixed. If yes, then
the jobtracker needs to be modified to allow everyone to create dirs in
mapred.system.dir (or the method of creation of the jobToken file needs to be
changed).
Apologies if this was operator error but I didn't get much feedback on the
mailing lists so not sure where/how else to raise this.
Changed introduced in MAPREDUCE-2219
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators:
https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira
