In all places I have found it only to be the primary group, not all the users supplemental groups.
On Mon, Jul 16, 2012 at 3:05 PM, Clay B. <c...@clayb.net> wrote: > Hi all, > > I have a Hadoop cluster which uses Samba to map an Active Directory domain > to my CentOS 5.7 Hadoop cluster. However, I notice a strange mismatch with > groups. Does anyone have any debugging advice, or how to refresh the DFS > groups mapping? If not, should I file a bug at > https://issues.apache.org/jira/browse/HADOOP? > > # I see the following error: > [clayb@hamster ~]$ hadoop fs -ls /projects/foobarcommander > log4j:ERROR Could not find value for key log4j.appender.NullAppender > log4j:ERROR Could not instantiate appender named "NullAppender". > ls: could not get get listing for > 'hdfs://hamster:9000/projects/foobarcommander' : > org.apache.hadoop.security.AccessControlException: Permission denied: > user=clayb, access=READ_EXECUTE, > inode="/projects/foobarcommander":hadmin:foobarcommander:drwxrwx--- > > # I verify group membership -- look a mismatch! > [clayb@hamster ~]$ which groups > /usr/bin/groups > [clayb@hamster ~]$ groups > foobarcommander xxx_rec_eng domain users all all_north america batchlogon > xxx-s xxx03-s xxx1-admins xxx-emr-users xxx-emr-admins xxx1-users > BUILTIN\users > [clayb@hamster ~]$ hadoop dfsgroups > log4j:ERROR Could not find value for key log4j.appender.NullAppender > log4j:ERROR Could not instantiate appender named "NullAppender". > clayb : domain users xxx_rec_eng xxx-emr-users all xxx-emr-admins batchlogon > all_north america xxx1-users xxx-s xxx03-s xxx1-admins BUILTIN\users > > Notice, in particular the foobarcommander group is only shown for my > /usr/bin/groups output. It looks like the following from the HDFS > Permissions Guide[1] is not correct, in my case: > "The group list is the equivalent of `bash -c groups`." > > # I have tried the following to no useful effect: > [admin@hamster ~]$ hadoop dfsadmin -refreshUserToGroupsMappings > log4j:ERROR Could not find value for key log4j.appender.NullAppender > log4j:ERROR Could not instantiate appender named "NullAppender". > > # I do, however, see other users with the foobarcommander group, so the > group should be "visible" to Hadoop: > [clayb@hamster ~]$ hadoop dfsgroups pat > log4j:ERROR Could not find value for key log4j.appender.NullAppender > log4j:ERROR Could not instantiate appender named "NullAppender". > pat : domain users all_north america all_san diego all foobarcommander > BUILTIN\users > # And 'hadoop mrgroups' (like dfsgroups) returns the same bad data, for me: > [clayb@hamster ~]$ hadoop mrgroups > log4j:ERROR Could not find value for key log4j.appender.NullAppender > log4j:ERROR Could not instantiate appender named "NullAppender". > clayb : domain users xxx_rec_eng xxx-emr-users all xxx-emr-admins batchlogon > all_north america xxx1-users xxx-s xxx03-s xxx1-admins BUILTIN\users > > # And I see that the system is getting the right data via getent(1): > [clayb@hamster ~]$ getent group foobarcommander > foobarcommander:*:16777316:pat,user1,user2,user3,clayb,user4,user5,user6,user7,user8,user9,user10,user12,user13,user14,user15 > > # I am using Cloudera's CDH3u4 Hadoop: > [clayb@hamster ~]$ hadoop version > Hadoop 0.20.2-cdh3u4 > Subversion file:///data/1/tmp/topdir/BUILD/hadoop-0.20.2-cdh3u4 -r > 214dd731e3bdb687cb55988d3f47dd9e248c5690 > Compiled by root on Mon May 7 14:03:02 PDT 2012 > From source with checksum a60c9795e41a3248b212344fb131c12c > > I also do not see any obviously useful errors in my namenode logs. > > -Clay > > [1]: > http://hadoop.apache.org/common/docs/r0.20.2/hdfs_permissions_guide.html#User+Identity >
