HTCdaskGateway

• A Dask Gateway client extension for heterogeneous cluster mode combining the Kubernetes backend for pain-free scheduler networking, with COFFEA-powered HTCondor workers and/or OKD [coming soon].
• Latest is installed by default and deployed to the COFFEA-DASK notebook on EAF (https://analytics-hub.fnal.gov). A few lines will get you going!
• The current image for workers/schedulers is: coffeateam/coffea-dask-cc7-gateway:0.7.12-fastjet-3.3.4.0rc9-g8a990fa

Basic usage @ Fermilab EAF

• Make sure the notebook launched supports this functionality (COFFEA-DASK notebook)

from htcdaskgateway import HTCGateway

gateway = HTCGateway()
cluster = gateway.new_cluster()
cluster

# Scale my cluster to 5 HTCondor workers
cluster.scale(5)

# Obtain a client for connecting to your cluster scheduler
# Your cluster should be ready to take requests
client = cluster.get_client()
client

# When computations are finished, shutdown the cluster
cluster.shutdown()

Other functions worth checking out

• This is a multi-tenant environment, and you are authenticated via JupyterHub Oauth which means that you can create as many* clusters as you wish
• To list your clusters:

# Verify that the gateway is responding to requests by asking to list all its clusters
clusters = gateway.list_clusters()
clusters

• To connect to a specific cluster from the list:

cluster = gateway.connect(cluster_name)
cluster
cluster.shutdown()

• To gracefully close the cluster and remove HTCondor worker jobs associated to it:

cluster.shutdown()

• There are widgets implemented by Dask Gateway. Make sure to give them a try from your EAF COFFEA notebook, just execute the the client and cluster commands (after properly initializing them) in a cell like:

-------------
cluster = gateway.new_cluster()
cluster
< Widget will appear after this step>
-------------
client = cluster.get_client()
client
< Widget will apear after this step >
-------------
cluster
< Widget will appear after this step >