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From "Guozhang Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-4486) Kafka Streams - exception in process still commits offsets
Date Mon, 05 Dec 2016 04:41:58 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-4486?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15721213#comment-15721213
] 

Guozhang Wang commented on KAFKA-4486:
--------------------------------------

[~joel.lundell] Thanks for reporting your use case, which exception were you trying to throw
that always triggered `StreamThread#shutdownTaskAndStat`? Streams tries to distinguish retriable
exception from fatal ones and upon seeing a fatal error we should not commit the offsets while
closing the instance.

> Kafka Streams - exception in process still commits offsets
> ----------------------------------------------------------
>
>                 Key: KAFKA-4486
>                 URL: https://issues.apache.org/jira/browse/KAFKA-4486
>             Project: Kafka
>          Issue Type: Bug
>          Components: streams
>    Affects Versions: 0.10.1.0
>         Environment: Java 8
>            Reporter: Joel Lundell
>
> I'm building a streams application and would like to be able to control the commits manually
using ProcessorContext#commit() from an instance of org.apache.kafka.streams.processor.Processor.
> My use case is that I want to read messages from a topic and push them to AWS SQS and
I need to be able to guarantee that all messages reach the queue at least once. I also want
to use SQS batching support so my approach at the moment is that in Processor#process i'm
saving X records in a data structure and when I have a full batch I send it off and if successful
i commit. If I for any reason can't deliver the records I don't want the offsets being committed
so that when processing works again I can start processing from the last successful record.
> When I was trying out the error handling I noticed that if I create a Processor and in
the process method always throw an exception that will trigger StreamThread#shutdownTaskAndState
which calls StreamThread#commitOffsets and next time I run the application it starts as if
the previous "record" was successfully processed.
> Is there a way to achieve what I'm looking for?
> I found a similar discussion in https://issues.apache.org/jira/browse/KAFKA-3491 but
that issue is still open.



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