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https://issues.apache.org/jira/browse/SPARK-39489?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17554874#comment-17554874
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Apache Spark commented on SPARK-39489:
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User 'JoshRosen' has created a pull request for this issue:
https://github.com/apache/spark/pull/36885
> Improve EventLoggingListener and ReplayListener performance by replacing
> Json4S ASTs with Jackson trees
> -------------------------------------------------------------------------------------------------------
>
> Key: SPARK-39489
> URL: https://issues.apache.org/jira/browse/SPARK-39489
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 3.0.0
> Reporter: Josh Rosen
> Assignee: Josh Rosen
> Priority: Major
>
> Spark's event log JsonProtocol currently uses Json4s ASTs to generate and
> parse JSON. Performance overheads from Json4s account for a significant
> proportion of all time spent in JsonProtocol. If we replace Json4s usage with
> direct usage of Jackson APIs then we can significantly improve performance
> (~2x improvement for writing and reading in my own local microbenchmarks).
> This performance improvement translates to faster history server load times
> and reduced load on the Spark driver (and reduced likelihood of dropping
> events because the listener cannot keep up, therefore reducing the likelihood
> of inconsistent Spark UIs).
> Reducing our usage of Json4s is also a step towards being able to eventually
> remove our dependency on Json4s: Spark's current use of Json4s creates
> library conflicts for end users who want to adopt Json4s 4 (see discussion on
> PRs for SPARK-36408). If Spark can eventually remove its Json4s dependency
> then we will completely eliminate such conflicts.
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