mosche opened a new issue, #23439:
URL: https://github.com/apache/beam/issues/23439

   ### What happened?
   
   Attempting to use the Spark "uber jar" job server when not in local mode 
fails with a NoSuchFileException.
   ```
   python -m apache_beam.examples.wordcount \
   --output ./data_test/ \
   --runner=SparkRunner \
   --spark_submit_uber_jar \
   --spark_master_url=spark://spark-master:7077 \
   --environment_type=LOOPBACK
   ```
   
   This was reported in https://stackoverflow.com/a/66342031/4278032, I was 
able to reproduce the issue locally.
   
   ```
   ERROR:root:Exception from the cluster: java.nio.file.NoSuchFileException: 
/tmp/tmp029vgh_0.jar
   ```
   
   A work-around is to mount some shared storage for `/tmp` on all workers and 
the job itself. That suggests the jar isn't copied to all places where required.
   
   ### Issue Priority
   
   Priority: 2
   
   ### Issue Component
   
   Component: runner-spark


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