Good morning,
I've been playing with Pig using three setups:
(a) local
(b) hadoop mapred with hdfs
(c) hadoop mapred with file:///path/to/shared/fs as the default file system
In our local setup, various NFS filesystems are shared between all
machines (including mapred nodes) eg /users, /local
I would like Pig to note when input files are in a file:// directory
that has been marked as shared, and hence not copy it to DFS.
For comparison, the Torque PBS resource manager has a usecp directive,
which notes when a filesystem location is shared between all nodes, (and
hence scp is not needed). See
http://www.clusterresources.com/wiki/doku.php?id=torque:6.2_nfs_and_other_networked_filesystems
It would be good to have a configurable setting in Pig that says when a
filesystem is shared, and hence no copying between file:// and hdfs://
is needed.
An example in our setup might be:
sharedFS file:///local/
sharedFS file:///users/
if commands should be used.
Relatedly, if I use a fs.default.name=file:///path/to/shared/fs then the
default file path for Pig job information is not suitable (eg
/tmp/tempRANDOMINT is NOT shared on all nodes)
C
