[jira] [Commented] (KAFKA-4819) Expose states of active tasks to public API

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

    [ https://issues.apache.org/jira/browse/KAFKA-4819?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15888916#comment-15888916 ] 

ASF GitHub Bot commented on KAFKA-4819:
---------------------------------------

GitHub user fhussonnois opened a pull request:

    https://github.com/apache/kafka/pull/2612

    KAFKA-4819: Expose states for active tasks to public API

    Simple implementation of the feature : [KAFKA-4819](https://issues.apache.org/jira/browse/KAFKA-4819)
     KAFKA-4819
    
    This PR adds a new method `threadStates` to public API of `KafkaStreams` which returns all currently states of running threads and active tasks.
    
    Below is a example for a simple topology consuming from topics; test-p2 and test-p4.
    
    [{"name":"StreamThread-1","state":"RUNNING","activeTasks":[{"id":"0_0", "assignments":["test-p4-0","test-p2-0"], "consumedOffsetsByPartition":[{"topicPartition":"test-p2-0","offset":"test-p2-0"}]}, {"id":"0_2", "assignments":["test-p4-2"], "consumedOffsetsByPartition":[]}]}, {"name":"StreamThread-2","state":"RUNNING","activeTasks":[{"id":"0_1", "assignments":["test-p4-1","test-p2-1"], "consumedOffsetsByPartition":[{"topicPartition":"test-p2-1","offset":"test-p2-1"}]}, {"id":"0_3", "assignments":["test-p4-3"], "consumedOffsetsByPartition":[]}]}]

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

    $ git pull https://github.com/fhussonnois/kafka KAFKA-4819

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

    https://github.com/apache/kafka/pull/2612.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 #2612
    
----
commit 0f8b8123cabdbfcfb44fe59b9be20e13ac253c95
Author: Florian Hussonnois <fl...@gmail.com>
Date:   2017-02-23T22:08:01Z

    KAFKA-4819: Expose states for active tasks to public API

----


> Expose states of active tasks to public API
> -------------------------------------------
>
>                 Key: KAFKA-4819
>                 URL: https://issues.apache.org/jira/browse/KAFKA-4819
>             Project: Kafka
>          Issue Type: New Feature
>          Components: streams
>    Affects Versions: 0.10.2.0
>            Reporter: Florian Hussonnois
>            Priority: Minor
>
> In Kafka 0.10.1.0 the toString method of KafkaStreams class has been implemented mainly to ease topologies debugging. Also,  the streams Metrics has been exposed to public API.
> But currently theres is no way to monitor kstreams tasks states, assignments or consumed offsets.
> I propose to expose the states of active tasks to the public API KafkaStreams.
> For instance, an application can expose a REST API to get the global state of a kstreams topology.



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