TCPConnectionMap$TCPConnection$ConnectionPeerReceiver allocate and hold a 1.6G byte[] ------------------------------------------------------------------------------------- Key: JGRP-1530 URL: https://issues.jboss.org/browse/JGRP-1530 Project: JGroups Issue Type: Bug Affects Versions: 2.10 Environment: Linux (2.6.18-308.13.1.el5) Java HotSpot(TM) 64-Bit Server VM (20.10-b01, mixed mode) Reporter: Ken Chiu Assignee: Bela Ban Fix For: 3.3 Attachments: hold_by_jgroups.JPG, hold_by_jgroups.JPG, large_byte_array.JPG, large_byte_array.JPG In our application, after running a few hours of load test we will encounter OutOfMemoryError. It is caused by we use TCPPING with port_range and hit a JVM defect: http://bugs.sun.com/bugdatabase/view_bug.do;jsessionid=a8f3e6a330c2871287... When we use TCPPING with port_range in some linux environments, the application can occasionally connect to a not listened local port. This socket will have the same local/destination port. If this connection is established, bytes written via this socket's OutputStream will be read from this socket's InputStream. In JGroups, a client socket will send cookie({ 'b', 'e', 'l', 'a' }) as its first data and it will be read from the same socket's InputStream at TCPConnectionMap$TCPConnection$ConnectionPeerReceiver. This will allocation a 1.6G byte[] and hold it forever because the client socket won't read enough data in its whole life. I think a simple solution is to check the connected client socket is a self-connected(local/destination ip and port are the same) and retry next port when this happen.