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Posted to issues@spark.apache.org by "Yi Zhang (Jira)" <ji...@apache.org> on 2022/12/21 07:18:00 UTC
[jira] [Commented] (SPARK-41650) json expressions much slower in optimized mode
[ https://issues.apache.org/jira/browse/SPARK-41650?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17650114#comment-17650114 ]
Yi Zhang commented on SPARK-41650:
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[~gurwls223] , [~viirya] can you help look into this?
> json expressions much slower in optimized mode
> ----------------------------------------------
>
> Key: SPARK-41650
> URL: https://issues.apache.org/jira/browse/SPARK-41650
> Project: Spark
> Issue Type: Bug
> Components: Spark Core, Structured Streaming
> Affects Versions: 3.2.2
> Reporter: Yi Zhang
> Priority: Major
>
> I noticed spark structured streaming reading from Kafka json string into struct type is much slower in spark-3.1+ than spark-3.0. Profiling reveals the json expressions in spark-3.0 mostly on evaluate subExpr, while spark-3.1/3.2 spent a lot time on writeField.
> Suspect this may be related to SPARK-32948, so I tried with add a bogus option
> from_json($"value", mySchema, Map("bogus_key"-> "bogus_value")
> this turns off the optimization and the performance is much better. For reference,
> for same amount #records, it is 30 seconds vs. 3 minute on a task processing 500k records. This is big difference for a streaming job.
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