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From Robert Metzger <rmetz...@apache.org>
Subject Re: zipWithIndex in Python API
Date Mon, 14 Mar 2016 09:37:53 GMT
Hi Shannon,

I'm happy to see some community engagement on our Python APIs!

On Fri, Mar 11, 2016 at 6:32 PM, Chesnay Schepler <chesnay@apache.org>

> The subtaskIndex is not currently exposed to the python operator.
> Fortunately this can be changed very easily:
> On the java side, within PythonStreamer.startPython() the python process
> is started and several parameters are transferred (L.129++) using
> stdin/-out.
> These parameters are received on the python side in Environment.execute()
> (L.168++).
> So the transfer is rather straight-forward, after that you only have to
> modify the operator.configure() method to
> also take a subtaskIndex argument, modify the RuntimeContext constructor,
> add a getIndexOfThisSubtask() method and you're set.
> Feel free to open a JIRA for this.
> On 11.03.2016 18:15, Shannon Quinn wrote:
>> Hi all,
>> I'm interested in getting involved the Python API development. The first
>> use-case I've encountered in my work is that of zipWithIndex, so I started
>> looking into how to go about implementing that. It looks like the core of
>> it involves being able to uniquely identify what worker you're currently in
>> between distributed calls; the Scala end has
>> getRuntimeContext().getIndexOfThisSubtask(), but Python's runtime context
>> is more or less limited to the broadcast variables.
>> Happy to hear any hints as to how I should get started with this. Thanks.
>> Regards,
>> Shannon

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