mosche opened a new pull request, #24862:
URL: https://github.com/apache/beam/pull/24862
The most common way to submit jobs to a Spark cluster is to use
`spark-submit`. `SparkSessionFactory` doesn't handle that well. Despite
`spark.master` being set by `spark-submit`, it's overwritten by the respective
`PipelineOption` which defaults to `local[*]`.
- Fix factory to not overwrite `spark.master` if configured already, use the
effective Spark master going forward.
Staging of classpath artifacts is necessary when running on a cluster using
a local driver. This is required to populate `spark.jars` as it would be done
by `spark-submit` otherwise. Unfortunately this is broken as staging is done
after the session was already created.
- Enable `userClassPathFirst` to deal with conflicting dependency versions.
For Spark & Beam that's usually the case for Jackson and Guava, but potentially
also others.
- Correctly stage classpath if not in local mode and if `spark.jars` is not
set. Exclude Spark jars and similar that are already available on the cluster
and that cause conflicts if enabling `userClassPathFirst`.
(fixes #24861).
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