[jira] [Resolved] (SPARK-26360) Avoid extra validateQuery call in createStreamingWriteSupport

["Hyukjin Kwon (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-26360?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hyukjin Kwon resolved SPARK-26360.
----------------------------------
       Resolution: Fixed
    Fix Version/s: 3.0.0

Issue resolved by pull request 23309
[https://github.com/apache/spark/pull/23309]

> Avoid extra validateQuery call in createStreamingWriteSupport
> -------------------------------------------------------------
>
>                 Key: SPARK-26360
>                 URL: https://issues.apache.org/jira/browse/SPARK-26360
>             Project: Spark
>          Issue Type: Improvement
>          Components: Structured Streaming
>    Affects Versions: 2.3.2, 2.4.0
>            Reporter: Wu Wenjie
>            Assignee: Wu Wenjie
>            Priority: Trivial
>             Fix For: 3.0.0
>
>
> When I'm reading structured streaming source code, I find there is a redundant KafkaWriter.validateQuery() function call in createStreamingWriteSupport func in class `KafkaSourceProvider`.
> {code:scala}
> // KafkaSourceProvider.scala
>   override def createStreamingWriteSupport(
>       queryId: String,
>       schema: StructType,
>       mode: OutputMode,
>       options: DataSourceOptions): StreamingWriteSupport = {
>    .....
>     // validate once here
>     KafkaWriter.validateQuery(schema.toAttributes, producerParams, topic)
>     // validate twice here
>     new KafkaStreamingWriteSupport(topic, producerParams, schema)
>   }
> // KafkaStreamingWriteSupport.scala
> class KafkaStreamingWriteSupport(
>     topic: Option[String],
>     producerParams: ju.Map[String, Object],
>     schema: StructType)
>   extends StreamingWriteSupport {
>   validateQuery(schema.toAttributes, producerParams, topic)
>   ....
> }
> {code}
>  
> I think we just need to remove one of these two.



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