On Aug 23, 2007, at 7:44 PM, ChaoChun Liang wrote:
Is "hadoop.tmp.dir" the same property with "mapred.system.dir" (i.e. this directory is in your default file system and must be accessible from both the client and server machines and is typically in HDFS) for the clustering?
No, they are not the same at all. However, the default value for mapred.system.dir is ${hadoop.tmp.dir}/mapred/system, which is a pretty bad value for a real cluster, because it puts server data into a user specific directory under /tmp.
The default is set that way to make sure that single node clusters don't interfere with each other, but we need to create a template for a distributed cluster configuration.
-- Owen
