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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-5886) Python API for streaming applications
Date Mon, 22 May 2017 12:00:08 GMT

    [ https://issues.apache.org/jira/browse/FLINK-5886?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16019488#comment-16019488
] 

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_r117724604
  
    --- Diff: flink-libraries/flink-streaming-python/src/main/java/org/apache/flink/streaming/python/api/datastream/PythonObjectInputStream2.java
---
    @@ -0,0 +1,68 @@
    +/*
    + * 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.python.util.PythonObjectInputStream;
    +
    +import java.io.IOException;
    +import java.io.InputStream;
    +import java.io.ObjectStreamClass;
    +
    +/**
    + * A helper class to overcome the inability to set the serialVersionUID in a python user-defined
    + * function (UDF).
    + * <p>The fact the this field is not set, results in a dynamic calculation of this
serialVersionUID,
    + * using SHA, to make sure it is a unique number. This unique number is a 64-bit hash
of the
    + * class name, interface class names, methods, and fields. If a Python class inherits
from a
    + * Java class, as in the case of Python UDFs, then a proxy wrapper class is created.
Its name is
    + * constructed using the following pattern:
    + * <b>{@code org.python.proxies.<module-name>$<UDF-class-name>$<number>}</b>.
The {@code <number>}
    + * part is increased by one in runtime, for every job submission. It results in different
serial
    + * version UID for each run for the same Python class. Therefore, it is required to silently
    + * suppress the serial version UID mismatch check.</p>
    + */
    +public class PythonObjectInputStream2 extends PythonObjectInputStream {
    --- End diff --
    
    remove ยด2` from name.


> 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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