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-rw-r--r--core/src/main/scala/org/apache/spark/SparkEnv.scala2
1 files changed, 2 insertions, 0 deletions
diff --git a/core/src/main/scala/org/apache/spark/SparkEnv.scala b/core/src/main/scala/org/apache/spark/SparkEnv.scala
index a796e72850..0f1e2e0695 100644
--- a/core/src/main/scala/org/apache/spark/SparkEnv.scala
+++ b/core/src/main/scala/org/apache/spark/SparkEnv.scala
@@ -331,6 +331,8 @@ object SparkEnv extends Logging {
case "netty" =>
new NettyBlockTransferService(conf, securityManager, numUsableCores)
case "nio" =>
+ logWarning("NIO-based block transfer service is deprecated, " +
+ "and will be removed in Spark 1.6.0.")
new NioBlockTransferService(conf, securityManager)
}