[jboss-jira] [JBoss JIRA] Closed: (JGRP-940) MERGE: issue with overlapping merges (NAKACK / UNICAST)

MERGE: issue with overlapping merges (NAKACK / UNICAST) ------------------------------------------------------- Key: JGRP-940 URL: https://jira.jboss.org/jira/browse/JGRP-940 Project: JGroups Issue Type: Bug Reporter: Bela Ban Assignee: Bela Ban Fix For: 2.6.10.merge, 2.8 Merge issue (see attached logs). When we have {A,B,C} on (A, B and C) and {A,B,C,D} (on D) merging, the NAKACK information for C might be incorrect due to the fact that D returned a digest containing old information on C. The issue for UNICAST is similar: D's UNICAST connection table was *not* cleared for A, B or C because it never received a view change. However, A, B and C cleared their UNICAST connection table of D because they excluded D. After a merge, D's unicasts to the other partition (and vice versa) will likely fail because D's UNICAST connection tables for A, B and C still contains the old sequence numbers, but the ones for A, B and C start with #1 again ! A possible solution for NAKACK is to verify we handle digests for overlapping partitions OK, and for UNICAST, we'll might have to introduce a seqno agreement protocol, ie. tagging the first seqno as first=true. A more detailed description will follow.