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