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

[Bela Ban (JIRA)]

UNICAST: high contention
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                 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

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