Why is my Spark job showing STAGING for a while in the Mesos UI?

Review the stdout and stderr logs in the Mesos sandbox, but most likely it’s either downloading the Docker image for the first time on the host or still downloading all the jars. To find the Mesos logs:

  1. Go the Mesos web interface: <hostname>/mesos.

  2. From the Active Tasks table, click the Sandbox link.

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