# Ray Client + Dask on Ray? **URL:** \ **Category:** Ray Client\ **Created:** [April 20, 2021, 12:51am UTC](https://discuss.ray.io/t/ray-client-dask-on-ray/1793 "2021-04-20T00:51:20Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![jennakwon06](https://avatars.discourse-cdn.com/v4/letter/j/b19c9b/32.png) [@jennakwon06](https://discuss.ray.io/u/jennakwon06)\ **Post date:** [April 20, 2021, 12:51am UTC](https://discuss.ray.io/t/ray-client-dask-on-ray/1793/1 "2021-04-20T00:51:20Z")
Hello! I am trying to use Dask on Ray, and Ray Client. I am just wondering if this integration is supposed to work. My code looks something like… ```auto import ray ray.util.connect("10.0.0.211:10001") # replace with the appropriate host and port import dask from ray.util.dask import ray_dask_get dask.config.set(scheduler=ray_dask_get) func = lambda x, y: x + y x = da.arange(8).reshape(2, 4).rechunk((1, 2)) y = da.arange(4).rechunk(2) da.map_overlap(func, x, y, depth=1).compute(scheduler=ray_dask_get) ``` Above `compute` call fails with something like … ```auto (pid=15372, ip=10.0.220.22) 2021-04-20 00:50:27,696 ERROR worker.py:77 -- Unhandled error (suppress with RAY_IGNORE_UNHANDLED_ERRORS=1): ray::dask:('rechunk-split-rechunk-merge-b732b7c02930dfce2158436c45af0891', 0) (pid=15372, ip=10.0.220.22) (pid=15372, ip=10.0.220.22) File "python/ray/_raylet.pyx", line 501, in ray._raylet.execute_task (pid=15372, ip=10.0.220.22) File "/home/ec2-user/anaconda3/envs/miami_ml_base/lib/python3.7/site-packages/ray/util/dask/scheduler.py", line 346, in dask_task_wrapper (pid=15372, ip=10.0.220.22) TypeError: 'ray._raylet.ObjectRef' object is not subscriptable .... (pid=15372, ip=10.0.220.22) File "python/ray/_raylet.pyx", line 501, in ray._raylet.execute_task (pid=15372, ip=10.0.220.22) File "/home/ec2-user/anaconda3/envs/miami_ml_base/lib/python3.7/site-packages/ray/util/dask/scheduler.py", line 346, in dask_task_wrapper (pid=15372, ip=10.0.220.22) File "/opt/amazon/lib/python3.7/site-packages/dask/array/core.py", line 4409, in concatenate3 (pid=15372, ip=10.0.220.22) chunks = chunks_from_arrays(arrays) (pid=15372, ip=10.0.220.22) File "/opt/amazon/lib/python3.7/site-packages/dask/array/core.py", line 4180, in chunks_from_arrays (pid=15372, ip=10.0.220.22) result.append(tuple([shape(deepfirst(a))[dim] for a in arrays])) (pid=15372, ip=10.0.220.22) File "/opt/amazon/lib/python3.7/site-packages/dask/array/core.py", line 4180, in (pid=15372, ip=10.0.220.22) result.append(tuple([shape(deepfirst(a))[dim] for a in arrays])) (pid=15372, ip=10.0.220.22) IndexError: tuple index out of range ``` ---
**Author:** ![sangcho](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ray.io/sangcho/32/425_2.png) [@sangcho](https://discuss.ray.io/u/sangcho)\ **Post date:** [April 20, 2021, 5:57am UTC](https://discuss.ray.io/t/ray-client-dask-on-ray/1793/2 "2021-04-20T05:57:35Z")
cc @Clark_Zinzow Is this the known issue? ---
**Author:** ![Clark\_Zinzow](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ray.io/clark_zinzow/32/445_2.png) [@Clark\_Zinzow](https://discuss.ray.io/u/Clark_Zinzow)\ **Post date:** [April 20, 2021, 1:02pm UTC](https://discuss.ray.io/t/ray-client-dask-on-ray/1793/3 "2021-04-20T13:02:06Z")
@sangcho @jennakwon06 This is a known issue and _should_ be fixed in latest master. @jennakwon06 I’m assuming that this is occurring with Ray 1.2 and not the latest master wheel? ---
**Author:** ![Clark\_Zinzow](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ray.io/clark_zinzow/32/445_2.png) [@Clark\_Zinzow](https://discuss.ray.io/u/Clark_Zinzow)\ **Post date:** [April 20, 2021, 1:02pm UTC](https://discuss.ray.io/t/ray-client-dask-on-ray/1793/4 "2021-04-20T13:02:58Z")
Also @sangcho this is the fix that we decided not to pick up for the 1.3 release, so this will continue to be broken until the 1.4 release. ---
**Author:** ![jennakwon06](https://avatars.discourse-cdn.com/v4/letter/j/b19c9b/32.png) [@jennakwon06](https://discuss.ray.io/u/jennakwon06)\ **Post date:** [April 20, 2021, 3:44pm UTC](https://discuss.ray.io/t/ray-client-dask-on-ray/1793/5 "2021-04-20T15:44:57Z")
I am using this wheel: pip install -U [https://ray-wheels.s3-us-west-2.amazonaws.com/master/190ab40645a241974a87ebeb99e7989886347ba4/ray-2.0.0.dev0-cp37-cp37m-manylinux2014\_x86\_64.whl](https://ray-wheels.s3-us-west-2.amazonaws.com/master/190ab40645a241974a87ebeb99e7989886347ba4/ray-2.0.0.dev0-cp37-cp37m-manylinux2014_x86_64.whl) @Clark_Zinzow Gotcha. To confirm - I can expect this to work if I use the latest commit on this 2.0.0 wheel, right? ---
**Author:** ![Clark\_Zinzow](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ray.io/clark_zinzow/32/445_2.png) [@Clark\_Zinzow](https://discuss.ray.io/u/Clark_Zinzow)\ **Post date:** [April 21, 2021, 1:58am UTC](https://discuss.ray.io/t/ray-client-dask-on-ray/1793/6 "2021-04-21T01:58:47Z")
@jennakwon06 That should be the case! Definitely let us know if it still doesn’t work.