[jira] [Closed] (FLINK-8001) Mark Kafka Consumer as idle if it doesn't have partitions

["Tzu-Li (Gordon) Tai (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-8001?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tzu-Li (Gordon) Tai closed FLINK-8001.
--------------------------------------
       Resolution: Fixed
    Fix Version/s:     (was: 1.3.3)
                   1.3.4

> Mark Kafka Consumer as idle if it doesn't have partitions
> ---------------------------------------------------------
>
>                 Key: FLINK-8001
>                 URL: https://issues.apache.org/jira/browse/FLINK-8001
>             Project: Flink
>          Issue Type: Bug
>            Reporter: Aljoscha Krettek
>            Assignee: Tzu-Li (Gordon) Tai
>            Priority: Blocker
>             Fix For: 1.3.4, 1.4.0
>
>
> In Flink 1.3.x the Kafka Consumer will emit a {{Long.MAX_VALUE}} watermark if it has zero partitions assigned. If this happens and other parallel instances of the Kafka Consumer are marked as idle (which currently never happens by default but does happen in custom forks of our Kafka code) this means that the watermark jumps to {{Long.MAX_VALUE}} downstream.
> In Flink 1.4.x this happens implicitly in the {{PeriodicWatermarkEmitter}} in {{AbstractFetcher}} where the watermark is {{Long.MAX_VALUE}} if we don't have any partitions. This should be changed to mark the source as idle instead, if we don't have any partitions.



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