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Posted to dev@kafka.apache.org by "Dmitry Minkovsky (JIRA)" <ji...@apache.org> on 2016/06/17 19:53:05 UTC
[jira] [Commented] (KAFKA-3862) Kafka streams documentation:
partition<->thread<->task assignment unclear
[ https://issues.apache.org/jira/browse/KAFKA-3862?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15336800#comment-15336800 ]
Dmitry Minkovsky commented on KAFKA-3862:
-----------------------------------------
Oh hey, I somehow missed 0.10 and Confluent 3.0. Current version of docs are much clearer/don't have this issue.
> Kafka streams documentation: partition<->thread<->task assignment unclear
> -------------------------------------------------------------------------
>
> Key: KAFKA-3862
> URL: https://issues.apache.org/jira/browse/KAFKA-3862
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 0.10.0.0
> Environment: N/A
> Reporter: Dmitry Minkovsky
> Assignee: Guozhang Wang
> Priority: Minor
> Fix For: 0.10.0.0
>
>
> Hi. Not sure if this is the right place to post about documentation (this isn't actually a software bug).
> I believe the following span of documentation is self-contradictory:
> !http://i.imgur.com/WM8ada2.png!
> In the paragraph text before and after the image, it says the partitions are *evenly distributed* among the threads. However, in the image, Thread 1 gets p1 and p3 (4 partitions, total) while Thread 2 gets p2 (2 partitions, total). That's "even" in the sense that you can't do any better, but still not even, and in conflict with the text that follows the image:
> !http://i.imgur.com/xq3SOre.png!
> This doesn't make sense because why would p2 from topicA and topicB go to different threads? if this were the cause, you couldn't join the partitions, right?
> Either way, it seems like the two things are in conflict.
> Finally, the wording:
> bq. ...assume that each thread executes a single stream task...
> What does "assume" mean here? I've not seen any indication elsewhere in the documentation that shows you can configure this behavior. Sorry if I missed this.
> Thank you!
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