[Spread-users] write(): java.net.SocketException

John Schultz jschultz at spreadconcepts.com
Mon Nov 5 16:16:03 EST 2012

A TCP connection reset error typically indicates that the other end of the peer connection has already been closed.  In your case, the Spread daemon has likely already closed the client connection on which you are trying to send.

In Spread, this happens most often when a client isn't reading fast enough from the Server.  After a while, the message delivery queue on the daemon for that client gets too large and it kills the client connection for using too much of its memory resources.

This typically indicates that your sending applications are either (a) too bursty, (b) persistently too fast in how they send to the group or your receivers are (c) occasionally too slow / unresponsive.  The fact that this problem is intermittent hints that the problem is more likely (a) and/or (c).

To avoid this issue you need to have application level flow control such that your senders can't overwhelm your receivers (if that is compatible with your application).

Here's a primer I wrote on application level flow control a long time ago:



John Lane Schultz
Spread Concepts LLC
Phn: 301 830 8100
Cell: 443 838 2200

On Nov 5, 2012, at 3:03 PM, Shawn Bradford wrote:


We are currently using spread and have found this error occurring quite frequently. Unfortunately there is little information on write() errors to be found on the net (many more read() errors).

spread.SpreadException: write(): java.net.SocketException: Connection reset

Would someone be able to describe what would be a potential issue causing this?  I am looking for some guidance as to the source of the error (maybe from a developer) to assist in debugging the error.

We have tried to write several test apps to replicate the bug but have been unsuccessful.  Our system is quite large with many moving parts and it is unclear as to what sequence of events are causing the errors.

We are using spread 4.1 on 64 bit centos 5.5.

Thanks in advance,

*	  Director Software | Mojix Inc.
  phone : +1.562.221.3474
  email : shawn.bradford at mojix.com
  web : www.mojix.com

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