spark-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Justin Miller (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-17147) Spark Streaming Kafka 0.10 Consumer Can't Handle Non-consecutive Offsets
Date Tue, 18 Oct 2016 19:15:58 GMT

    [ https://issues.apache.org/jira/browse/SPARK-17147?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15586387#comment-15586387
] 

Justin Miller commented on SPARK-17147:
---------------------------------------

Log compaction? Only for our offset topics.

> Spark Streaming Kafka 0.10 Consumer Can't Handle Non-consecutive Offsets
> ------------------------------------------------------------------------
>
>                 Key: SPARK-17147
>                 URL: https://issues.apache.org/jira/browse/SPARK-17147
>             Project: Spark
>          Issue Type: Bug
>          Components: Streaming
>    Affects Versions: 2.0.0
>            Reporter: Robert Conrad
>
> When Kafka does log compaction offsets often end up with gaps, meaning the next requested
offset will be frequently not be offset+1. The logic in KafkaRDD & CachedKafkaConsumer
has a baked in assumption that the next offset will always be just an increment of 1 above
the previous offset. 
> I have worked around this problem by changing CachedKafkaConsumer to use the returned
record's offset, from:
> {{nextOffset = offset + 1}}
> to:
> {{nextOffset = record.offset + 1}}
> and changed KafkaRDD from:
> {{requestOffset += 1}}
> to:
> {{requestOffset = r.offset() + 1}}
> (I also had to change some assert logic in CachedKafkaConsumer).
> There's a strong possibility that I have misconstrued how to use the streaming kafka
consumer, and I'm happy to close this out if that's the case. If, however, it is supposed
to support non-consecutive offsets (e.g. due to log compaction) I am also happy to contribute
a PR.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscribe@spark.apache.org
For additional commands, e-mail: issues-help@spark.apache.org


Mime
View raw message