void cancelMerge(MergeId id) {
if (setMergeId(id, null)) {
merge_task.stop();
merge_rsps.reset();
gms.getViewHandler().resume(id);
}
}
void cancelMerge(MergeId id) {
if (setMergeId(id, null)) {
merge_task.stop();
stopMergeKiller();
merge_rsps.reset();
gms.getViewHandler().resume();
gms.getDownProtocol().down(new Event(Event.RESUME_STABLE));
}
}
public boolean setMergeId(MergeId expected, MergeId new_value) {
merge_lock.lock();
try {
boolean match = Util.match(this.merge_id, expected);
if (match) {
if (new_value != null && merge_id_history.contains(new_value)) return false;
else merge_id_history.add(new_value);
this.merge_id = new_value;
if (this.merge_id != null) {
// Clears the view handler queue and discards all JOIN/LEAVE/MERGE requests until after
// the MERGE
gms.getViewHandler().suspend();
gms.getDownProtocol().down(new Event(Event.SUSPEND_STABLE, 20000));
startMergeKiller();
}
}
return match;
} finally {
merge_lock.unlock();
}
}
/**
* Get the view and digest and send back both (MergeData) in the form of a MERGE_RSP to the
* sender. If a merge is already in progress, send back a MergeData with the merge_rejected field
* set to true.
*
* @param sender The address of the merge leader
* @param merge_id The merge ID
* @param mbrs The set of members from which we expect responses
*/
public void handleMergeRequest(
Address sender, MergeId merge_id, Collection<? extends Address> mbrs) {
boolean success = matchMergeId(merge_id) || setMergeId(null, merge_id);
if (!success) {
if (log.isWarnEnabled()) log.warn(gms.local_addr + ": merge is already in progress");
sendMergeRejectedResponse(sender, merge_id);
return;
}
/* Clears the view handler queue and discards all JOIN/LEAVE/MERGE requests until after the MERGE */
gms.getViewHandler().suspend(merge_id);
if (log.isDebugEnabled())
log.debug(
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.view_id != null ? gms.view_id.copy() : null;
if (tmp_vid == null) {
log.warn("view ID is null; cannot return merge response");
sendMergeRejectedResponse(sender, merge_id);
return;
}
View view = new View(tmp_vid, new Vector<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 */
boolean successfulFlush = gms.startFlush(view);
if (!successfulFlush) {
sendMergeRejectedResponse(sender, merge_id);
if (log.isWarnEnabled())
log.warn(
gms.local_addr
+ ": flush failed; sending merge rejected message to "
+ sender
+ ", merge_id="
+ merge_id);
cancelMerge(merge_id);
return;
}
Digest digest = fetchDigestsFromAllMembersInSubPartition(members);
if (digest.size() == 0) {
log.error("failed fetching digests from subpartition members; dropping merge response");
return;
}
sendMergeResponse(sender, view, digest, merge_id);
}
