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https://issues.apache.org/jira/browse/SYSTEMML-1658?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Deron Eriksson reassigned SYSTEMML-1658:
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Assignee: Niketan Pansare
> Route DML print statements from JVM back to Python
> --------------------------------------------------
>
> Key: SYSTEMML-1658
> URL: https://issues.apache.org/jira/browse/SYSTEMML-1658
> Project: SystemML
> Issue Type: Improvement
> Components: APIs
> Reporter: Mike Dusenberry
> Assignee: Niketan Pansare
>
> Currently, a DML print statement results in a System.out.println call in the
> JVM. For Python, this output will not be routed back as Python standard out,
> and thus it will not be visible in some environments, such as a Jupyter
> notebook. In a Python repl, the output will be visible, but only because the
> JVM will be printing to the same terminal as the Python process is running
> from, and thus the user will see the output. Since a large amount of ML work
> is performed within a notebook using Python, we should figure out how to
> route this output back to the Python std out.
> Relevant:
> * https://www.py4j.org/py4j_java_gateway.html#py4j.java_gateway.launch_gateway
> *
> https://github.com/apache/spark/blob/a36a76ac43c36a3b897a748bd9f138b629dbc684/python/pyspark/java_gateway.py#L36
> *
> https://github.com/bartdag/py4j/blob/262a20477a8a302cae0ede597c93b953a3fc2702/py4j-python/src/py4j/java_gateway.py#L320
> *
> https://github.com/bartdag/py4j/blob/262a20477a8a302cae0ede597c93b953a3fc2702/py4j-python/src/py4j/java_gateway.py#L596
> *
> https://github.com/bartdag/py4j/blob/262a20477a8a302cae0ede597c93b953a3fc2702/py4j-python/src/py4j/java_gateway.py#L312
> *
> https://github.com/apache/spark/blob/a36a76ac43c36a3b897a748bd9f138b629dbc684/python/pyspark/java_gateway.py#L77
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