THRIFT-4193 Lower the default maxReadBufferBytes for non-blocking servers
Client: Java
Patch: Roshan George <rgeorge@liveramp.com>

This closes #1264
diff --git a/lib/java/src/org/apache/thrift/server/AbstractNonblockingServer.java b/lib/java/src/org/apache/thrift/server/AbstractNonblockingServer.java
index 0c492cc..9c94b76 100644
--- a/lib/java/src/org/apache/thrift/server/AbstractNonblockingServer.java
+++ b/lib/java/src/org/apache/thrift/server/AbstractNonblockingServer.java
@@ -50,7 +50,7 @@
   protected final Logger LOGGER = LoggerFactory.getLogger(getClass().getName());
 
   public static abstract class AbstractNonblockingServerArgs<T extends AbstractNonblockingServerArgs<T>> extends AbstractServerArgs<T> {
-    public long maxReadBufferBytes = Long.MAX_VALUE;
+    public long maxReadBufferBytes = 256 * 1024 * 1024;
 
     public AbstractNonblockingServerArgs(TNonblockingServerTransport transport) {
       super(transport);