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);
}
