Amanda, I thought someone with a bit more HDFS expertise might answer this, but I'll take a shot.
As long as the file storage/permission checks happen locally, I don't think there is any problem with the users' IDs being different across a cluster. This is not true for something like NFS where multiple systems are sharing same filesystem. So question is how HDFS handles it. According to [1], the owner/group are stored as strings, not numeric IDs. And permission checks happen on the namenode. So I think it is not necessary for the numeric user IDs to be in synch across a cluster. [1] https://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-hdfs/HdfsPermissionsGuide.html --Steve > -----Original Message----- > From: Amanda Moran [mailto:[email protected]] > Sent: Friday, August 12, 2016 12:08 PM > To: dev <[email protected]> > Subject: Trafodion User and Group id (installation) > > Hi there All- > > Does the group id and user id need to be the same on all nodes? > > I tested with them being different on each node, and I don't see any > issues. > Example: > node-2: trafodion:x:509:488::/home/trafodion:/bin/bash > node-1: trafodion:x:503:503::/home/trafodion:/bin/bash > > > Seems to work great. Is there something I don't know about? > > Thanks! > > -- > Thanks, > > Amanda Moran
