[jboss-jira] [JBoss JIRA] Commented: (JGRP-532) TCP: hangs without FC

[ http://jira.jboss.com/jira/browse/JGRP-532?page=comments#action_12365487 ] Bela Ban commented on JGRP-532: ------------------------------- Not true, also happens when send queues are disabled. What happens is that Connection._send() can block on the TCP write(), as the receiver node set the sliding window to 0. Example: - A and B - A (NAKACK) receives a message from B, acquires a lock on B's NakReceiverWindow and passes the message up. - In A.STABLE, we determine that we've seen enough bytes, and send down a STABLE message - The STABLE message blocks on write() (B has temporarily set its sliding window to 0) - Now all messages from B will not get processed as the lock for B's NRW is held by the blocked write() thread - Therefore A will send a sliding window size of 0 to B, which will cause B's write() to block ==> deadlock -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://jira.jboss.com/jira/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira