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https://issues.apache.org/jira/browse/FLINK-4092?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15338462#comment-15338462
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ASF GitHub Bot commented on FLINK-4092:
---------------------------------------
GitHub user shahinism opened a pull request:
https://github.com/apache/flink/pull/2130
[FLINK-4092] Python API Stringify map function's type conversion is
breaking executing provided example in documents
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/shahinism/flink bug/flink-4092-python-api
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/2130.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #2130
----
commit f45362f0401afca716237f00bf9a166c7c861fc4
Author: Shahin <[email protected]>
Date: 2016-06-19T10:03:14Z
[FLINK-4092] (Python API) Stringify map function's type conversion problem
is breaking running provided example in documents
----
> Stringify map function's type conversion problem is breaking running provided
> example in documents
> --------------------------------------------------------------------------------------------------
>
> Key: FLINK-4092
> URL: https://issues.apache.org/jira/browse/FLINK-4092
> Project: Flink
> Issue Type: Bug
> Components: DataSet API, Python API
> Affects Versions: 1.0.3
> Reporter: Shahin Azad
> Labels: easyfix
>
> This function definition:
> {code:python}
> def map(self, value):
> if isinstance(value, (tuple, list)):
> return "(" + b", ".join([self.map(x) for x in value]) + ")"
> else:
> return str(value)
> {code}
> in {{/resources/python/flink/plan/DataSet.py}} will raise an exception since
> implicit type conversion between {{String}} to {{Bytes}} is not possible.
> User will get following error if he tries to run the wordcount example from
> the documentation:
> {code}
> File
> "/tmp/flink-dist-cache-fb3d569b-c811-4065-acef-32267183aa15/f1b0eb6c0a099b22760f7300760e6e80/flink/flink/plan/Da
> taSet.py", line 38, in map
> return "(" + b", ".join([self.map(x) for x in value]) + ")"
> TypeError: sequence item 0: expected a bytes-like object, str found
> at
> org.apache.flink.python.api.streaming.data.PythonStreamer.streamBufferWithoutGroups(PythonStreamer.java:269)
> at
> org.apache.flink.python.api.functions.PythonMapPartition.mapPartition(PythonMapPartition.java:54)
> at
> org.apache.flink.runtime.operators.MapPartitionDriver.run(MapPartitionDriver.java:98)
> at
> org.apache.flink.runtime.operators.BatchTask.run(BatchTask.java:480)
> at
> org.apache.flink.runtime.operators.BatchTask.invoke(BatchTask.java:345)
> at org.apache.flink.runtime.taskmanager.Task.run(Task.java:559)
> at java.lang.Thread.run(Thread.java:745)
> {code}
> To resolve this issue it's enough to change {{b", "}} to a normal string by
> removing Byte conversion notation.
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