mboehm7 commented on pull request #1421:
URL: https://github.com/apache/systemds/pull/1421#issuecomment-996242254
LGTM - this is a great start toward multi-tenant federated learning where
multiple data scientists (coordinators) are properly isolated at the federated
sites.
Initially the tests did not work for me because the wait for process
completion ran into a blocking state due to filled up queues. After
reimplementing how we obtain the output before going into wait state this
issues was resolved. However, there still seems to be an issue:
```
org.apache.spark.SparkException: A master URL must be set in your
configuration
at org.apache.spark.SparkContext.<init>(SparkContext.scala:380)
```
because the `DMLScript.USE_LOCAL_SPARK_CONFIG` is still set to false in the
spawned coordinator processes. Could you have a look - maybe a new
SystemDS-config property could do the trick?
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