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From "Guozhang Wang (JIRA)" <j...@apache.org>
Subject [jira] [Reopened] (KAFKA-5217) Improve Streams internal exception handling
Date Tue, 18 Jul 2017 16:31:00 GMT

     [ https://issues.apache.org/jira/browse/KAFKA-5217?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Guozhang Wang reopened KAFKA-5217:

[~enothereska] The parent JIRA is an umbrella story of improving error handling in Streams,
while this JIRA itself has a defined sub-task scope on the streams internal exception handling.
Have you made a thorough pass over all the call traces to make sure all the issues are already
resolved? One example I can tell is that, in {{KeyValueStore.put(k, v)}} function we may throw
KafkaException or StreamsException from the {{StoreChangeLogger}} although we do not document
in in the javadocs. Though it is debatable that whether we should encourage users to ever
try-catch all Exceptions in their cals, I'm afraid there are maybe other cases that we have
not thought about yet.

> Improve Streams internal exception handling
> -------------------------------------------
>                 Key: KAFKA-5217
>                 URL: https://issues.apache.org/jira/browse/KAFKA-5217
>             Project: Kafka
>          Issue Type: Sub-task
>          Components: streams
>    Affects Versions:
>            Reporter: Matthias J. Sax
>            Assignee: Matthias J. Sax
>             Fix For:
> Streams does not handle all exceptions gracefully atm, but tend to throw exceptions to
the user, even if we could handle them internally and recover automatically. We want to revisit
this exception handling to be more resilient.
> For example, for any kind of rebalance exception, we should just log it, and rejoin the
consumer group.

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