[jira] [Commented] (FLINK-9183) Kafka consumer docs to warn about idle partitions

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-9183?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16439546#comment-16439546 ] 

ASF GitHub Bot commented on FLINK-9183:
---------------------------------------

GitHub user juhoautio opened a pull request:

    https://github.com/apache/flink/pull/5858

    [FLINK-9183] [Documentation] Kafka consumer docs to warn about idle partitions

    https://issues.apache.org/jira/browse/FLINK-9183
    
    Another sub-task was added as a reminder to remove this part of the docs when FLINK-5479 is resolved:
    https://issues.apache.org/jira/browse/FLINK-9184
    
    ## What is the purpose of the change
    
    Warn users of FLINK-9183 until it gets fixed.
    
    ## Brief change log
    
    Added one paragraph.
    
    ## Verifying this change
    
    Verified by running `./build_docs.sh -p` and checking the result in browser.
    
    ## Does this pull request potentially affect one of the following parts:
    
      - Dependencies (does it add or upgrade a dependency): no
      - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: no
      - The serializers: no
      - The runtime per-record code paths (performance sensitive): no
      - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: no
      - The S3 file system connector: no
    
    ## Documentation
    
      - Does this pull request introduce a new feature? no
      - If yes, how is the feature documented? not applicable


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

    $ git pull https://github.com/juhoautio/flink document_idle_kafka_partitions_issue

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

    https://github.com/apache/flink/pull/5858.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 #5858
    
----
commit d832042f680ec4d89bcb7ca0e4838bd84fa20b4b
Author: juhoautio <au...@...>
Date:   2018-04-16T14:40:23Z

    FLINK-9183: Kafka consumer docs to warn about idle partitions

----


> Kafka consumer docs to warn about idle partitions
> -------------------------------------------------
>
>                 Key: FLINK-9183
>                 URL: https://issues.apache.org/jira/browse/FLINK-9183
>             Project: Flink
>          Issue Type: Sub-task
>            Reporter: Juho Autio
>            Assignee: Juho Autio
>            Priority: Major
>
> Looks like the bug FLINK-5479 is entirely preventing FlinkKafkaConsumerBase#assignTimestampsAndWatermarks to be used if there are any idle partitions. It would be nice to mention in documentation that currently this requires all subscribed partitions to have a constant stream of data with growing timestamps. When watermark gets stalled on an idle partition it blocks everything.
>  
> Link to current documentation:
> [https://ci.apache.org/projects/flink/flink-docs-master/dev/connectors/kafka.html#kafka-consumers-and-timestamp-extractionwatermark-emission]



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