[jboss-jira] [JBoss JIRA] (JGRP-1480) NAKACK retransmission request for message 0

Tue Jun 12 17:44:04 EDT 2012

    [ https://issues.jboss.org/browse/JGRP-1480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12700893#comment-12700893 ] 

Dennis Reed commented on JGRP-1480:
-----------------------------------

The root issue appears to be in NAKACK#rebroadcastMessages, which is called during a FLUSH_RECONCILE when the digests on different nodes
do not match (due to the multicast packet loss), and the requester node has not received any messages from the local_addr node.

NAKACK#rebroadcastMessages requests messages [my_high, their_high].  It appears this should be [my_high + 1, their_high] instead.

> NAKACK retransmission request for message 0
> -------------------------------------------
>
>                 Key: JGRP-1480
>                 URL: https://issues.jboss.org/browse/JGRP-1480
>             Project: JGroups
>          Issue Type: Bug
>    Affects Versions: 2.6.20
>            Reporter: Dennis Reed
>            Assignee: Dennis Reed
>
> The following warning is logged.  Since there is no message with ID 0, it should not be requested for retransmission.
>     WARN  [org.jgroups.protocols.pbcast.NAKACK] (OOB-19,10.1.1.1:55200) (requester=10.1.1.2:55200, local_addr=10.1.1.1:55200) message 10.1.1.1:55200::0 not found in retransmission table of 10.1.1.1:55200:
> [0 : 7 (7) (size=7, missing=0, highest stability=0)]
> It occurred during a FLUSH when a node is trying to join the cluster, in a network that is dropping some multicast packets.

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