You can ignore that warning message. It was logged by mistake due to a regression. It's fixed on HEAD and will be included in 0.20.0.
commit dd94a1fe9aff281f49d61bd8c214f41fcb340b04 Author: Vinod Kone <[email protected]> Date: Thu May 29 15:32:03 2014 -0700 Fixed a bug in scheduler driver to properly erase 'savedOffers'. Review: https://reviews.apache.org/r/22148 On Mon, Jul 14, 2014 at 1:53 PM, Whitney Sorenson <[email protected]> wrote: > Any reason for the warning messages that always appear as a result? > > > On Mon, Jul 14, 2014 at 1:11 PM, Vinod Kone <[email protected]> wrote: > >> Yes. You can definitely launch multiple tasks within the same offer >> (launchTasks() takes multiple TaskInfos) as long as the sum total of >> resources required by the tasks (and their executors) can fit in the >> offered resources. In fact, if you are hoarding offers (not recommended if >> you are running multiple frameworks), you could use multiple offers in >> launchTasks() as long as the offers belong to the same slave. >> >> >> On Mon, Jul 14, 2014 at 8:53 AM, Whitney Sorenson <[email protected]> >> wrote: >> >>> During some recent testing, I found it could take quite a few offer >>> cycles in order to launch a high number of small tasks. >>> >>> Unfortunately, my reading of the framework + driver API didn't yield a >>> definitive answer. >>> >>> So, I wrote the code to calculate the remaining resources in an offer, >>> and tried it and it seems to work (the tasks launch and run on slave); >>> however, I do see warning messages: >>> >>> W0714 16:45:40.227408 400543744 sched.cpp:901] Attempting to launch task >>> test-sleep-101-1405352740168-2-localhost-DEFAULT with an unknown offer >>> 20140714-163828-16777343-5050-53164-67 >>> >>> -Whitney >>> >>> >> >
