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From "Jason Gustafson (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (KAFKA-6593) Coordinator disconnect in heartbeat thread can cause commitSync to block indefinitely
Date Wed, 28 Feb 2018 19:24:02 GMT

     [ https://issues.apache.org/jira/browse/KAFKA-6593?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jason Gustafson updated KAFKA-6593:
-----------------------------------
    Priority: Critical  (was: Major)

> Coordinator disconnect in heartbeat thread can cause commitSync to block indefinitely
> -------------------------------------------------------------------------------------
>
>                 Key: KAFKA-6593
>                 URL: https://issues.apache.org/jira/browse/KAFKA-6593
>             Project: Kafka
>          Issue Type: Bug
>          Components: consumer
>    Affects Versions: 1.0.0, 0.11.0.2
>            Reporter: Jason Gustafson
>            Assignee: Jason Gustafson
>            Priority: Critical
>             Fix For: 1.1.0
>
>         Attachments: consumer.log
>
>
> If a coordinator disconnect is observed in the heartbeat thread, it can cause a pending
offset commit to be cancelled just before the foreground thread begins waiting on its response
in poll(). Since the poll timeout is Long.MAX_VALUE, this will cause the consumer to effectively
hang until some other network event causes the poll() to return. We try to protect this case
with a poll condition on the future, but this isn't bulletproof since the future can be completed
outside of the lock.



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