[jira] [Resolved] (SPARK-53190) Use Java `InputStream.transferTo` instead of `ByteStreams.copy`

["Dongjoon Hyun (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-53190?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dongjoon Hyun resolved SPARK-53190.
-----------------------------------
    Fix Version/s: 4.1.0
       Resolution: Fixed

Issue resolved by pull request 51918
[https://github.com/apache/spark/pull/51918]

> Use Java `InputStream.transferTo` instead of `ByteStreams.copy`
> ---------------------------------------------------------------
>
>                 Key: SPARK-53190
>                 URL: https://issues.apache.org/jira/browse/SPARK-53190
>             Project: Spark
>          Issue Type: Sub-task
>          Components: Spark Core
>    Affects Versions: 4.1.0
>            Reporter: Dongjoon Hyun
>            Assignee: Dongjoon Hyun
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 4.1.0
>
>
> Java `transferTo` is significantly faster than `ByteStreams.copy`.
> {code}
> scala> import java.io._
> import java.io._
> scala> spark.time(new FileInputStream("/tmp/4G.bin").transferTo(new FileOutputStream("/dev/null")))
> Time taken: 5 ms
> val res2: Long = 4294967296
> scala> spark.time(com.google.common.io.ByteStreams.copy(new FileInputStream("/tmp/4G.bin"), new FileOutputStream("/dev/null")))
> Time taken: 772 ms
> val res3: Long = 4294967296
> {code}



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