protected void _handleMergeRequest( Address sender, MergeId merge_id, Collection<? extends Address> mbrs) throws Exception { boolean success = matchMergeId(merge_id) || setMergeId(null, merge_id); if (!success) throw new Exception( "merge " + this.merge_id + " is already in progress, received merge-id=" + merge_id); /* Clears the view handler queue and discards all JOIN/LEAVE/MERGE requests until after the MERGE */ // gms.getViewHandler().suspend(); if (log.isTraceEnabled()) log.trace( gms.local_addr + ": got merge request from " + sender + ", merge_id=" + merge_id + ", mbrs=" + mbrs); // merge the membership of the current view with mbrs List<Address> members = new LinkedList<Address>(); if (mbrs != null) { // didn't use a set because we didn't want to change the membership order at this // time (although not incorrect) for (Address mbr : mbrs) { if (!members.contains(mbr)) members.add(mbr); } } ViewId tmp_vid = gms.getViewId(); if (tmp_vid != null) tmp_vid = tmp_vid.copy(); if (tmp_vid == null) throw new Exception("view ID is null; cannot return merge response"); View view = new View(tmp_vid, new ArrayList<Address>(members)); // [JGRP-524] - FLUSH and merge: flush doesn't wrap entire merge process // [JGRP-770] - Concurrent startup of many channels doesn't stabilize // [JGRP-700] - FLUSH: flushing should span merge /*if flush is in stack, let this coordinator flush its cluster island */ if (gms.flushProtocolInStack && !gms.startFlush(view)) throw new Exception("flush failed"); // we still need to fetch digests from all members, and not just return our own digest // (https://issues.jboss.org/browse/JGRP-948) Digest digest = fetchDigestsFromAllMembersInSubPartition(members, merge_id); if (digest == null || digest.size() == 0) throw new Exception( "failed fetching digests from subpartition members; dropping merge response"); sendMergeResponse(sender, view, digest, merge_id); }