I've been looking for a location on HDFS for temp data as part of HADOOP-13786, which has had me looking at hadoop.tmp.dir
1. There's no actual java constant for it 2. We don't spell out that it is in the local FS only...there's a risk that it is picked up and used in the cluster path, which is wrong, especially if a config changes that temp dir 3. And as Milind & AW have noted in the past, it's a single dir, not a list of directories Putting aside this confusion: we don't have any equivalent for the cluster fs, like "hdfs.tmp.dir" what should I be using here? And if there isn't a good answer other than "use hadoop.tmp.dir and hope the permissions are consistent", maybe its time to add one —even if the default value for it is just hadoop.tmp.dir -steve
