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Add Instructions for Ray Jobs with PyModules #413

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Expand Up @@ -85,6 +85,22 @@ word_count.show()
raydp.stop_spark()
```

Note: to support a Ray RuntimeEnv with [pymodules](https://docs.ray.io/en/latest/ray-core/api/doc/ray.runtime_env.RuntimeEnv.html#ray.runtime_env.RuntimeEnv) you must set the `spark.executorEnv.PYTHONPATH` in you Spark config:
```
import os
import ray
import raydp

ray.init()
spark = raydp.init_spark(app_name="RayDP Example",
num_executors=2,
executor_cores=2,
executor_memory="4GB",
configs={
"spark.executorEnv.PYTHONPATH": os.environ["PYTHONPATH"],
})
```

Spark features such as dynamic resource allocation, spark-submit script, etc are also supported. Please refer to [Spark on Ray](./doc/spark_on_ray.md) for more details.


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