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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2018/02/09 04:01:00 UTC

[jira] [Assigned] (SPARK-23366) Improve hot reading path in ReadAheadInputStream

     [ https://issues.apache.org/jira/browse/SPARK-23366?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-23366:
------------------------------------

    Assignee: Apache Spark

> 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
>            Assignee: Apache Spark
>            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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