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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-5886) Python API for streaming applications
Date Wed, 14 Jun 2017 09:49:01 GMT

    [ https://issues.apache.org/jira/browse/FLINK-5886?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16048960#comment-16048960
] 

ASF GitHub Bot commented on FLINK-5886:
---------------------------------------

Github user zentol commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3838#discussion_r121898935
  
    --- Diff: flink-libraries/flink-streaming-python/src/main/java/org/apache/flink/streaming/python/api/datastream/PythonKeyedStream.java
---
    @@ -0,0 +1,88 @@
    +/*
    + * Licensed to the Apache Software Foundation (ASF) under one
    + * or more contributor license agreements.  See the NOTICE file
    + * distributed with this work for additional information
    + * regarding copyright ownership.  The ASF licenses this file
    + * to you under the Apache License, Version 2.0 (the
    + * "License"); you may not use this file except in compliance
    + * with the License.  You may obtain a copy of the License at
    + *
    + *     http://www.apache.org/licenses/LICENSE-2.0
    + *
    + * Unless required by applicable law or agreed to in writing, software
    + * distributed under the License is distributed on an "AS IS" BASIS,
    + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    + * See the License for the specific language governing permissions and
    + * limitations under the License.
    + */
    +package org.apache.flink.streaming.python.api.datastream;
    +
    +import org.apache.flink.annotation.Public;
    +import org.apache.flink.api.common.functions.ReduceFunction;
    +import org.apache.flink.streaming.api.datastream.KeyedStream;
    +import org.apache.flink.streaming.api.windowing.time.Time;
    +import org.apache.flink.streaming.api.windowing.windows.GlobalWindow;
    +import org.apache.flink.streaming.api.windowing.windows.TimeWindow;
    +import org.apache.flink.streaming.python.api.functions.PyKey;
    +import org.apache.flink.streaming.python.api.functions.PythonReduceFunction;
    +import org.python.core.PyObject;
    +
    +import java.io.IOException;
    +
    +
    +/**
    + * A thin wrapper layer over {@link KeyedStream}.
    + *
    + * <p>A {@code PythonKeyedStream} represents a {@link PythonDataStream} on which
operator state is
    + * partitioned by key using a provided {@link org.apache.flink.api.java.functions.KeySelector;}</p>
    + */
    +@Public
    +public class PythonKeyedStream extends PythonDataStream<KeyedStream<PyObject, PyKey>>
{
    +
    +	public PythonKeyedStream(KeyedStream<PyObject, PyKey> stream) {
    --- End diff --
    
    we can remove the public modifier; this applied to other variations of `PythonDataStream`
as well, exception `PythonDataStream` itself.


> Python API for streaming applications
> -------------------------------------
>
>                 Key: FLINK-5886
>                 URL: https://issues.apache.org/jira/browse/FLINK-5886
>             Project: Flink
>          Issue Type: New Feature
>          Components: Python API
>            Reporter: Zohar Mizrahi
>            Assignee: Zohar Mizrahi
>
> A work in progress to provide python interface for Flink streaming APIs. The core technology
is based on jython and thus imposes two limitations: a. user defined functions cannot use
python extensions. b. the python version is 2.x
> The branch is based on Flink release 1.2.0, as can be found here:
> https://github.com/zohar-pm/flink/tree/python-streaming
> In order to test it, someone can use IntelliJ IDE. Assuming IntelliJ was setup properly
(see: https://ci.apache.org/projects/flink/flink-docs-release-1.3/internals/ide_setup.html),
one can run/debug {{org.apache.flink.python.api.PythonStreamBinderTest}}, which in return
will execute all the tests under {{/Users/zohar/dev/pm-flink/flink-libraries/flink-python/src/test/python/org/apache/flink/python/api/streaming}}



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