ASF GitHub Bot commented on FLINK-9183:

GitHub user juhoautio opened a pull request:


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

    Another sub-task was added as a reminder to remove this part of the docs 
when FLINK-5479 is resolved:
    ## 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 

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


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 <autiojuho@...>
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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