[jboss-jira] [JBoss JIRA] Resolved: (JGRP-780) UNICAST: regular message not delivered (in some cases) until new message arrives
[ http://jira.jboss.com/jira/browse/JGRP-780?page=all ]
Bela Ban resolved JGRP-780.
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Resolution: Done
The solution was to keep a counter which is incremented when a regular message is *added*,
but not *removed*, e.g. when a message arrives out of order.
When (more than 1) messages are removed, the counter is decremented.
When an OOB thread sees that the counter is > 0, it actually will remove and process
the regular messages., otherwise it returns.
This still allows OOB threads to block, but the chances are not much smaller. However, the
ultimate solution is probably to have separate retransmission tables (AckReceiverWindow
for UNICAST, NakreceiverWindow for NAKACK) to keep track of OOB and regular messages.
UNICAST: regular message not delivered (in some cases) until new
message arrives
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Key: JGRP-780
URL: http://jira.jboss.com/jira/browse/JGRP-780
Project: JGroups
Issue Type: Bug
Reporter: Bela Ban
Assigned To: Bela Ban
Priority: Critical
Fix For: 2.6.3, 2.7
When we have the following situation, message B3 will not get delivered at A:
- A and B
- B sends 3 unicast messages: B1 (regular), B2 (OOB) and B3 (regular)
- A receives B1, B3, B2
- A delivers B1
- B3 has to wait until B2 is received, so the thread returns
- B2 is received, but since it is OOB, after pushing the message up the stack, the thread
terminates !
==> B3 will not get delivered until B4 is received !
For NAKACK, this is not critical as stability messages will fix the 'last message
lost problem'. But, it would be nice to have the same solution to this problem also
for NAKACK...
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