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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-3338) Add print and writeAsText functions to the Streams DSL
Date Tue, 05 Apr 2016 03:04:25 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-3338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15225571#comment-15225571
] 

ASF GitHub Bot commented on KAFKA-3338:
---------------------------------------

GitHub user bbejeck opened a pull request:

    https://github.com/apache/kafka/pull/1187

    KAFKA-3338 [WIP]: Add print and writeAsText to KStream and KTable interfaces

    This is the first pass at implementing the print and writeAsText functionality for KStream
and KTable.  I have some uncertainty on how Serde instances are handled here.
    
    This contribution is my original work and I license this contribution to Apache-Kafka.

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/bbejeck/kafka KAFKA-3338-Add-print-writeAsText-to-Streams-DSL

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/kafka/pull/1187.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 #1187
    
----
commit 263891d4c86ec049f8848e47f56212fd36a12539
Author: bbejeck <bbejeck@gmail.com>
Date:   2016-04-05T02:44:49Z

    KAFKA-3338: Initial pass at implementing print/writeAsText functionality for KStream and
KTable.

----


> Add print and writeAsText functions to the Streams DSL
> ------------------------------------------------------
>
>                 Key: KAFKA-3338
>                 URL: https://issues.apache.org/jira/browse/KAFKA-3338
>             Project: Kafka
>          Issue Type: Sub-task
>          Components: kafka streams
>            Reporter: Guozhang Wang
>            Assignee: Bill Bejeck
>              Labels: newbie++
>             Fix For: 0.10.1.0
>
>
> We want to provide some REPL-like pattern for users for better debuggability. More concretely,
we want to allow users to easily inspect their intermediate data streams in the topology while
running the application. Theoretically this can be done by using a break point, or by calling
System.out.println() inside the operator, or through a finer grained trace-level logging.
But more user-friendly API would be to add a print() function to the KStream / KTable object
like:
> {code}
> // Prints the elements in this stream to the stdout, i.e. "System.out" of the JVM
> KStream#print(/* optional serde */);  
> KTable#print(/* optional serde */);  
> // Writes the stream as text file(s) to the specified location.
> KStream#writeAsText(String filePath, /* optional serde */);
> KTable#writeAsText(String filePath, /* optional serde */);
> {code}



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