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https://issues.apache.org/jira/browse/SPARK-53190?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Dongjoon Hyun updated SPARK-53190:
----------------------------------
Description:
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}
was:
{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}
> 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
> Priority: Major
>
> 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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