The submission API is experimental and may change between versions
Sometimes you have Dask Application you want to deploy completely on YARN, without having a corresponding process running on an edge node. This may come up with production applications deployed automatically, or long running jobs you don’t want to consume edge node resources.
To handle these cases,
dask-yarn provides a CLI Docs that can be used to
submit applications to be run on the YARN cluster asynchronously. There are
three commands that may be useful here:
dask-yarn submit: submit an application to the YARN cluster
dask-yarn status: check on the status of an application
dask-yarn kill: kill a running application
Submitting an Application¶
# Replace this cluster = YarnCluster(...) # with this cluster = YarnCluster.from_current()
This is because the script won’t be run until the cluster is already created -
at that point configuration passed to the
won’t be useful. Cluster configuration is instead passed via the
submit CLI (note that as before, the cluster can be
scaled dynamically after creation).
# Submit `myscript.py` to run on a dask cluster with 8 workers, # each with 2 cores and 4 GiB $ dask-yarn submit \ --environment my_env.tar.gz \ --worker-count 8 \ --worker-vcores 2 \ --worker-memory 4GiB \ myscript.py application_1538148161343_0051
This outputs a YARN Application ID, which can be used with other YARN tools.
Checking Application Status¶
Submitted application status can be checked using the YARN Web UI, or
dask-yarn status. This command takes one parameter -
the application id.
$ dask-yarn status application_1538148161343_0051 APPLICATION_ID NAME STATE STATUS CONTAINERS VCORES MEMORY RUNTIME application_1538148161343_0051 dask RUNNING UNDEFINED 9 17 33792 6m
Killing a Running Application¶
Submitted applications normally run until completion. If you need to terminate
one before then, you can use the
dask-yarn kill command. This command
takes one parameter - the application id.
$ dask-yarn kill application_1538148161343_0051
Accessing the Application Logs¶
Application logs can be retrieved a few ways: