Hello, One error I seem to be getting a lot is "Lost Task Tracker". The two reduce tasks that a particular machine is working on will fail with this error, which then propagates back to all the map tasks that it has completed, causing them to reexecute. What exactly does this message mean? I would assume that it means contact with the task tracker has been lost entirely, but the machine is still reported as part of the cluster (although none of the reexecuted map tasks seem to be assigned to it).
Thanks, Albert
