[jira] [Resolved] (KAFKA-4175) Can't have StandbyTasks in KafkaStreams where NUM_STREAM_THREADS_CONFIG > 1

["Guozhang Wang (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-4175?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Guozhang Wang resolved KAFKA-4175.
----------------------------------
    Resolution: Fixed

Issue resolved by pull request 1862
[https://github.com/apache/kafka/pull/1862]

> Can't have StandbyTasks in KafkaStreams where NUM_STREAM_THREADS_CONFIG > 1
> ---------------------------------------------------------------------------
>
>                 Key: KAFKA-4175
>                 URL: https://issues.apache.org/jira/browse/KAFKA-4175
>             Project: Kafka
>          Issue Type: Bug
>          Components: streams
>    Affects Versions: 0.10.1.0
>            Reporter: Damian Guy
>            Assignee: Damian Guy
>             Fix For: 0.10.1.0
>
>
> When we have StandbyTasks in a Kafka Streams app and we have > 1 threads per instance we can run into:
> {code}
> Caused by: java.io.IOException: task [1_0] Failed to lock the state directory: /private/tmp/kafka-streams-smoketest/2/SmokeTest/1_0
> {code}
> This is because the same StandbyTask has been assigned to each thread in the same KafkaStreams instance



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