Github user pwendell commented on a diff in the pull request:
https://github.com/apache/spark/pull/6176#discussion_r30454162
--- Diff: core/src/main/scala/org/apache/spark/io/CompressionCodec.scala ---
@@ -154,8 +154,53 @@ class SnappyCompressionCodec(conf: SparkConf) extends
CompressionCodec {
override def compressedOutputStream(s: OutputStream): OutputStream = {
val blockSize =
conf.getSizeAsBytes("spark.io.compression.snappy.blockSize", "32k").toInt
- new SnappyOutputStream(s, blockSize)
+ new SnappyOutputStreamWrapper(new SnappyOutputStream(s, blockSize))
}
override def compressedInputStream(s: InputStream): InputStream = new
SnappyInputStream(s)
}
+
+/**
+ * Wrapper over [[SnappyOutputStream]] which guards against
write-after-close and double-close
+ * issues. See SPARK-7660 for more details. This wrapping can be removed
if we upgrade to a version
+ * of snappy-java that contains the fix for
https://github.com/xerial/snappy-java/issues/107.
+ */
+private final class SnappyOutputStreamWrapper(os: SnappyOutputStream)
extends OutputStream {
+
+ private[this] var closed: Boolean = false
--- End diff --
Just double checking - this doesn't need to be volatile?
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