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From "Cody Koeninger (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-17935) Add KafkaForeachWriter in external kafka-0.8.0 for structured streaming module
Date Thu, 27 Oct 2016 18:12:58 GMT

    [ https://issues.apache.org/jira/browse/SPARK-17935?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15612663#comment-15612663
] 

Cody Koeninger commented on SPARK-17935:
----------------------------------------

So the main thing to point out is that Kafka producers currently aren't idempotent, so this
sink can't be fault-tolerant.

Regarding the design doc, couple of comments

- KafkaSinkRDD  Why is this necessary?  Seems like KafkaSink should do basically the same
as existing ForeachSink class

- CachedKafkaProducer  Why is this necessary?  A singleton producer per JVM is generally what's
recommended by kafka docs.




> Add KafkaForeachWriter in external kafka-0.8.0 for structured streaming module
> ------------------------------------------------------------------------------
>
>                 Key: SPARK-17935
>                 URL: https://issues.apache.org/jira/browse/SPARK-17935
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL, Streaming
>    Affects Versions: 2.0.0
>            Reporter: zhangxinyu
>
> Now spark already supports kafkaInputStream. It would be useful that we add `KafkaForeachWriter`
to output results to kafka in structured streaming module.
> `KafkaForeachWriter.scala` is put in external kafka-0.8.0.



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