Can someone detail the options that are available to set file permissions at the hadoop and os level? Here's what I have discovered thus far:
dfs.permissions = true|false (works as advertised) dfs.supergroup = supergroup (works as advertised) dfs.umaskmode = umask (I believe this should be used in lieu of dfs.umask) - it appears to set the permissions for files created in hadoop fs (minus execute permission). why was dffs.umask deprecated? what's difference between the 2. dfs.datanode.data.dir.perm = perm (not sure this is working at all?) I thought it was supposed to set permission on blks at the os level. Are there any other file permission configuration properties? What I would really like to do is set data blk file permissions at the os level so that the blocks can be locked down from all users except super and supergroup, but allow it to be used accessed by hadoop API as specified by hdfs permissions. Is this possible? Thanks. Tony Dean SAS Institute Inc. Senior Software Developer 919-531-6704
