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https://issues.apache.org/jira/browse/SPARK-23366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16357889#comment-16357889
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Apache Spark commented on SPARK-23366:
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User 'juliuszsompolski' has created a pull request for this issue:
https://github.com/apache/spark/pull/20555
> Improve hot reading path in ReadAheadInputStream
> ------------------------------------------------
>
> Key: SPARK-23366
> URL: https://issues.apache.org/jira/browse/SPARK-23366
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 2.3.0
> Reporter: Juliusz Sompolski
> Priority: Major
>
> ReadAheadInputStream was introduced in
> [apache/spark#18317|https://github.com/apache/spark/pull/18317] to optimize
> reading spill files from disk.
> However, investigating flamegraphs of profiles from investigating some
> regressed workloads after switch to Spark 2.3, it seems that the hot path of
> reading small amounts of data (like readInt) is inefficient - it involves
> taking locks, and multiple checks.
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