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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