[jboss-jira] [JBoss JIRA] Resolved: (JGRP-1043) UNICAST: high contention

UNICAST: high contention ------------------------ Key: JGRP-1043 URL: https://jira.jboss.org/jira/browse/JGRP-1043 Project: JGroups Issue Type: Task Reporter: Bela Ban Assignee: Bela Ban Fix For: 2.6.13, 2.8 If UNICAST receives a high number of messages *and* sends a high number of messages concurrently, there will be a lot of retransmissions. Reason is contention on 'connections', with up- and down messages accessing it concurrently. Both up- and down- messages impede each other and thus messages are not received in time, causing retransmissions (ACKs to be resent). SOLUTION: #1 Reduce contention and turn 'connections' from HashMap into ConcurrentHashMap #2 Break 'connections' into a send-table and receive-table: sends and acks access the send-table, receives the receive-table