[SPARK-17379][BUILD] Upgrade netty-all to 4.0.41 final for bug fixes

## What changes were proposed in this pull request?
Upgrade netty-all to latest in the 4.0.x line which is 4.0.41, mentions several bug fixes and performance improvements we may find useful, see netty.io/news/2016/08/29/4-0-41-Final-4-1-5-Final.html. Initially tried to use 4.1.5 but noticed it's not backwards compatible.

## How was this patch tested?
Existing unit tests against branch-1.6 and branch-2.0 using IBM Java 8 on Intel, Power and Z architectures

Author: Adam Roberts <aroberts@uk.ibm.com>

Closes #14961 from a-roberts/netty.

1 files changed, 5 insertions, 0 deletions

diff --git a/common/network-common/src/main/java/org/apache/spark/network/util/TransportConf.java b/common/network-common/src/main/java/org/apache/spark/network/util/TransportConf.java
index 0efc400aa3..7d5baa9a9c 100644
--- a/common/network-common/src/main/java/org/apache/spark/network/util/TransportConf.java
+++ b/common/network-common/src/main/java/org/apache/spark/network/util/TransportConf.java
@@ -23,6 +23,11 @@ import com.google.common.primitives.Ints;
  * A central location that tracks all the settings we expose to users.
  */
 public class TransportConf {
+  
+  static {
+    // Set this due to Netty PR #5661 for Netty 4.0.37+ to work
+    System.setProperty("io.netty.maxDirectMemory", "0");
+  }
 
   private final String SPARK_NETWORK_IO_MODE_KEY;
   private final String SPARK_NETWORK_IO_PREFERDIRECTBUFS_KEY;