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Posted to dev@crunch.apache.org by "Josh Wills (JIRA)" <ji...@apache.org> on 2016/07/06 00:46:11 UTC

[jira] [Commented] (CRUNCH-609) KafkaSource could skip data with slow broker response

    [ https://issues.apache.org/jira/browse/CRUNCH-609?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15363556#comment-15363556 ] 

Josh Wills commented on CRUNCH-609:
-----------------------------------

Cool, yay simpler impl. +1.

> KafkaSource could skip data with slow broker response
> -----------------------------------------------------
>
>                 Key: CRUNCH-609
>                 URL: https://issues.apache.org/jira/browse/CRUNCH-609
>             Project: Crunch
>          Issue Type: Bug
>          Components: IO
>            Reporter: Micah Whitacre
>            Assignee: Micah Whitacre
>         Attachments: CRUNCH-609.patch, CRUNCH-609b.patch, CRUNCH-609c.patch, CRUNCH-609d.patch
>
>
> In the case of the consumer.poll timing out, the KafkaRecordReader could return with no values in the records iterator which then causes the KafkaRecordReader to exit prematurely[1].  To fix this we need to probably better track the start/end offset and that progress vs the null value.
> Additionally if we wanted to be smarter we could do some "backoff" for the timeout or just have consumer specify a larger value.
> [1] - https://github.com/apache/crunch/blob/360d72a4f887505e020fdb8f99c3ccb1800693f6/crunch-kafka/src/main/java/org/apache/crunch/kafka/inputformat/KafkaRecordReader.java#L122



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