Github user pwendell commented on a diff in the pull request:
https://github.com/apache/spark/pull/3119#discussion_r20835119
--- Diff: core/src/main/scala/org/apache/spark/io/CompressionCodec.scala ---
@@ -42,27 +43,37 @@ trait CompressionCodec {
def compressedOutputStream(s: OutputStream): OutputStream
def compressedInputStream(s: InputStream): InputStream
-}
+ def isAvailable() : Boolean = true
--- End diff --
By the way - the fact that you cannot safely add a method with a default
implementation to a trait is not intuitive at all. You can checkout this
article for more information why this is:
http://stackoverflow.com/questions/18366817/is-adding-a-trait-method-with-implementation-breaking-backward-compatibility
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