[jira] [Updated] (KAFKA-9398) Kafka Streams main thread may not exit even after close timeout has passed

["Bill Bejeck (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-9398?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bill Bejeck updated KAFKA-9398:
-------------------------------
    Priority: Critical  (was: Major)

> Kafka Streams main thread may not exit even after close timeout has passed
> --------------------------------------------------------------------------
>
>                 Key: KAFKA-9398
>                 URL: https://issues.apache.org/jira/browse/KAFKA-9398
>             Project: Kafka
>          Issue Type: Improvement
>          Components: streams
>            Reporter: Bill Bejeck
>            Assignee: Bill Bejeck
>            Priority: Critical
>             Fix For: 2.5.0
>
>
> Kafka Streams offers the {{KafkaStreams.close()}} method when shutting down a Kafka Streams application.  There are two overloads to this method, one that takes no parameters and another taking a {{Duration}} specifying how long the {{close()}} method should block waiting for streams shutdown operations to complete.  The no-arg version of {{close()}} sets the timeout to {{Long.MAX_VALUE}}.
>  
> The issue is that if a {{StreamThread}} is some how hung or if one of the {{Consumer}} or {{Producer}} clients are in a hung state, the Kafka Streams application won't exit even after the specified timeout has expired.
> For example consider this scenario:
>  # A sink topic gets deleted by accident 
>  # The {{Producer max.block.ms}} config is set to high value
> In this case the {{Producer}} will issue a {{WARN}} logging statement and will continue to make metadata requests looking for the expected topic.  This will continue up until the {{max.block.ms}} expires.  If this value is high enough, calling {{close()}} with a timeout won't fix the issue as when the timeout expires, the Kafka Streams application main thread won't exit.
> To prevent this type of issue, we should call {{Thread.interrupt()}} on all {{StreamThread}} instances once the {{close()}} timeout has expired. 



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