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On-Demand Dask
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Configure Prerequisites

Configure Prerequisites

Before you can start using on-demand Dask clusters on Domino you must ensure that this functionality is enabled and properly configured on your deployment.

Note

Enable Dask on your deployment

To enable on-demand Dask functionality, Domino Administrators must set the ShortLived.DaskClustersEnabled feature flag to true.

The flag is on by default unless a Domino Administrator disables it for a deployment.

Create a base Dask cluster environment

By default, Domino does not include a Dask compatible Compute Environment that can be used for the components of the cluster. Without at least one such environment available, you cannot create a cluster.

When using on-demand Dask in Domino you will have two separate environments, one for the Dask cluster (base or worker environment) and one for the workspace/job execution (compute environment).

To create a new base Dask cluster environment, follow the general Environment Management instructions with the following environment_attributes.

new dask base environment modal

  • Base image

    Select Custom Image and enter an image URI that points to a deployable Dask image.

    The quickest way to get started is to use the release tag for your desired version of Dask from the options published by the Dask community at https://hub.docker.com/r/daskdev/dask.

    The available images include the full set of Dask components and common dependencies like Pandas and NumPy.

    To understand the contents of the image, see https://github.com/dask/dask-docker/blob/main/base/Dockerfile.

The available images include the full set of Dask components and common dependencies like Pandas and NumPy.

  • Supported clusters

    Select the Domino managed Dask option (required). This ensures that the environment will be available for use when creating Dask clusters from workspaces and jobs.

  • Visibility

    Set this attribute the same way you would for any other Compute Environment.

    You can set this attribute the same way you would for any other Compute Environment.

  • Dockerfile Instructions

    Leave blank to use the base image provided by the Dask community.

    You can modify this section to include additional packages that might be necessary for your workloads and must be available on the Dask cluster nodes.

    To learn more, see Managing dependencies.

    Note
  • Pluggable Notebooks / Workspace Sessions

    Leave this section blank as the Dask base environments are not intended to include notebook configuration.

Prepare your Dask execution compute environment

In addition to the base Dask cluster environment, you also must configure the Dask compute environments for workspaces and/or jobs that will connect to your cluster.

Domino recommends that you use the following base image to create a compatible workspace: quay.io/domino/dask-environment. See Domino Dask Environment for more information about this base image.

Customize this workspace compute environment:
  1. Use the image mentioned previously and add Docker Instructions.

  2. Use your own image and customizations. Then, use the following Docker Instructions to add the Dask packages.

    ### If using the Domino Standard Environment you would want to change to root user
    ### before installing packages and then change back to the ubuntu user. This may
    ### not be necessary if you are using a different base
    USER root
    
    ### Change Dask and Dask ML version as needed
    ENV DASK_VERSION=<ENTER_DASK_VERSION>
    ENV DASK_ML_VERSION=<ENTER_DASK_ML_VERSION>
    
    ### This will install the Dask client an all Dask collections
    ### Domino Standard Environment will already include Pandas and NumPy
    RUN pip install dask[complete]==$DASK_VERSION
    
    ### Add Dask-ml
    RUN pip install dask-ml==$DASK_ML_VERSION
    
    ### You may want to add optional dependencies that may be required for Dask functionality
    ### See more info at https://docs.dask.org/en/latest/install.html#optional-dependencies
    ###
    ### For example
    ### RUN pip install s3fs==2021.6.1 scipy==1.7.1
    
    ### If using Domino Standard Environment as base switch back to ubuntu user
    USER ubuntu
Note
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