[GitHub] spark pull request #17303: [SPARK-19112][CORE] add codec for ZStandard

[Cyan4973 <gi...@git.apache.org>]

Github user Cyan4973 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/17303#discussion_r115351567
  
    --- Diff: core/src/main/scala/org/apache/spark/io/CompressionCodec.scala ---
    @@ -215,3 +217,22 @@ private final class SnappyOutputStreamWrapper(os: SnappyOutputStream) extends Ou
         }
       }
     }
    +
    +/**
    + * :: DeveloperApi ::
    + * ZStandard implementation of [[org.apache.spark.io.CompressionCodec]].
    + *
    + * @note The wire protocol for this codec is not guaranteed to be compatible across versions
    + * of Spark. This is intended for use as an internal compression utility within a single Spark
    + * application.
    + */
    +@DeveloperApi
    +class ZStandardCompressionCodec(conf: SparkConf) extends CompressionCodec {
    +
    +  override def compressedOutputStream(s: OutputStream): OutputStream = {
    +    val level = conf.getSizeAsBytes("spark.io.compression.zstandard.level", "3").toInt
    --- End diff --
    
    Use cases which favor speed over size should prefer using level 1.
    Compression speed difference is fairly large.


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