/**
* Tests a simple split: {A,B} and {C,D} need to merge back into one subgroup. Checks how many
* MergeViews are installed
*/
public void testSplitInTheMiddle2() throws Exception {
View v1 = View.create(a.getAddress(), 10, a.getAddress(), b.getAddress());
View v2 = View.create(c.getAddress(), 10, c.getAddress(), d.getAddress());
injectView(v1, a, b);
injectView(v2, c, d);
enableInfoSender(false, a, b, c, d);
Util.waitUntilAllChannelsHaveSameSize(10000, 500, a, b);
Util.waitUntilAllChannelsHaveSameSize(10000, 500, c, d);
enableInfoSender(false, a, b, c, d);
for (JChannel ch : Arrays.asList(a, b, c, d))
System.out.println(ch.getName() + ": " + ch.getView());
System.out.println("\nEnabling INFO sending in merge protocols to merge subclusters");
enableInfoSender(true, a, b, c, d);
Util.waitUntilAllChannelsHaveSameSize(30000, 1000, a, b, c, d);
System.out.println("\nResulting views:");
for (JChannel ch : Arrays.asList(a, b, c, d)) {
GMS gms = (GMS) ch.getProtocolStack().findProtocol(GMS.class);
View mv = gms.view();
System.out.println(mv);
}
for (JChannel ch : Arrays.asList(a, b, c, d)) {
GMS gms = (GMS) ch.getProtocolStack().findProtocol(GMS.class);
View mv = gms.view();
assert mv instanceof MergeView;
assert mv.size() == 4;
assert ((MergeView) mv).getSubgroups().size() == 2;
}
for (JChannel ch : Arrays.asList(a, b, c, d)) {
View view = ch.getView();
assert view.size() == 4 : "view should have 4 members: " + view;
}
}
/**
* Sends the new view and digest to all subgroup coordinors in coords. Each coord will in turn
*
* <ol>
* <li>broadcast the new view and digest to all the members of its subgroup (MergeView)
* <li>on reception of the view, if it is a MergeView, each member will set the digest and
* install the new view
* </ol>
*/
private void sendMergeView(
Collection<Address> coords, MergeData combined_merge_data, MergeId merge_id) {
if (coords == null || combined_merge_data == null) return;
View view = combined_merge_data.view;
Digest digest = combined_merge_data.digest;
if (view == null || digest == null) {
if (log.isErrorEnabled())
log.error("view or digest is null, cannot send consolidated merge view/digest");
return;
}
if (log.isDebugEnabled())
log.debug(
gms.local_addr + ": sending merge view " + view.getVid() + " to coordinators " + coords);
gms.merge_ack_collector.reset(coords);
int size = gms.merge_ack_collector.size();
long timeout = gms.view_ack_collection_timeout;
long start = System.currentTimeMillis();
for (Address coord : coords) {
Message msg = new Message(coord, null, null);
GMS.GmsHeader hdr = new GMS.GmsHeader(GMS.GmsHeader.INSTALL_MERGE_VIEW);
hdr.view = view;
hdr.my_digest = digest;
hdr.merge_id = merge_id;
msg.putHeader(gms.getId(), hdr);
gms.getDownProtocol().down(new Event(Event.MSG, msg));
}
// [JGRP-700] - FLUSH: flushing should span merge
// if flush is in stack wait for acks from separated island coordinators
if (gms.flushProtocolInStack) {
try {
gms.merge_ack_collector.waitForAllAcks(timeout);
long stop = System.currentTimeMillis();
if (log.isTraceEnabled())
log.trace(
"received all ACKs ("
+ size
+ ") for merge view "
+ view
+ " in "
+ (stop - start)
+ "ms");
} catch (TimeoutException e) {
log.warn(
gms.local_addr
+ ": failed to collect all ACKs for merge ("
+ size
+ ") for view "
+ view
+ " after "
+ timeout
+ "ms, missing ACKs from "
+ gms.merge_ack_collector.printMissing());
}
}
}
/**
* Multicasts a GET_DIGEST_REQ to all current members and waits for all responses (GET_DIGEST_RSP)
* or N ms.
*
* @return
*/
private Digest fetchDigestsFromAllMembersInSubPartition(List<Address> current_mbrs) {
if (current_mbrs == null) return null;
GMS.GmsHeader hdr = new GMS.GmsHeader(GMS.GmsHeader.GET_DIGEST_REQ);
Message get_digest_req = new Message();
get_digest_req.setFlag(Message.OOB);
get_digest_req.putHeader(gms.getId(), hdr);
long max_wait_time = gms.merge_timeout > 0 ? gms.merge_timeout / 2 : 2000L;
digest_collector.reset(current_mbrs);
// add my own digest first
Digest digest = (Digest) gms.getDownProtocol().down(Event.GET_DIGEST_EVT);
digest_collector.add(gms.local_addr, digest);
gms.getDownProtocol().down(new Event(Event.MSG, get_digest_req));
digest_collector.waitForAllResponses(max_wait_time);
if (log.isDebugEnabled()) {
if (digest_collector.hasAllResponses())
log.debug(gms.local_addr + ": fetched all digests for " + current_mbrs);
else
log.debug(
gms.local_addr
+ ": fetched incomplete digests (after timeout of "
+ max_wait_time
+ ") ms for "
+ current_mbrs);
}
Map<Address, Digest> responses = new HashMap<Address, Digest>(digest_collector.getResults());
MutableDigest retval = new MutableDigest(responses.size());
for (Digest dig : responses.values()) {
if (dig != null) retval.add(dig);
}
return retval;
}
/** Creates a singleton view for each channel listed and injects it */
protected static void createPartition(JChannel... channels) {
for (JChannel ch : channels) {
View view = Util.createView(ch.getAddress(), 5, ch.getAddress());
GMS gms = (GMS) ch.getProtocolStack().findProtocol(GMS.class);
gms.installView(view);
}
}
/**
* If merge_id is not equal to this.merge_id then discard. Else cast the view/digest to all
* members of this group.
*/
public void handleMergeView(final MergeData data, final MergeId merge_id) {
if (!matchMergeId(merge_id)) {
if (log.isErrorEnabled())
log.error("merge_ids don't match (or are null); merge view discarded");
return;
}
// only send to our *current* members, if we have A and B being merged (we are B), then we would
// *not*
// receive a VIEW_ACK from A because A doesn't see us in the pre-merge view yet and discards the
// view
// [JGRP-700] - FLUSH: flushing should span merge
// we have to send new view only to current members and we should not wait
// for view acks from newly merged mebers
List<Address> newViewMembers = new Vector<Address>(data.view.getMembers());
newViewMembers.removeAll(gms.members.getMembers());
gms.castViewChangeWithDest(data.view, data.digest, null, newViewMembers);
// if we have flush in stack send ack back to merge coordinator
if (gms.flushProtocolInStack) {
Message ack = new Message(data.getSender(), null, null);
ack.setFlag(Message.OOB);
GMS.GmsHeader ack_hdr = new GMS.GmsHeader(GMS.GmsHeader.INSTALL_MERGE_VIEW_OK);
ack.putHeader(gms.getId(), ack_hdr);
gms.getDownProtocol().down(new Event(Event.MSG, ack));
}
cancelMerge(merge_id);
}
protected void sendMergeRejectedResponse(Address sender, MergeId merge_id) {
Message msg = new Message(sender).setFlag(Message.Flag.OOB, Message.Flag.INTERNAL);
GMS.GmsHeader hdr = new GMS.GmsHeader(GMS.GmsHeader.MERGE_RSP);
hdr.merge_rejected = true;
hdr.merge_id = merge_id;
msg.putHeader(gms.getId(), hdr);
gms.getDownProtocol().down(new Event(Event.MSG, msg));
}
/**
* Fetches the digests from all members and installs them again. Used only for diagnosis and
* support; don't use this otherwise !
*/
void fixDigests() {
Digest digest = fetchDigestsFromAllMembersInSubPartition(gms.view.getMembers());
Message msg = new Message();
GMS.GmsHeader hdr = new GMS.GmsHeader(GMS.GmsHeader.INSTALL_DIGEST);
hdr.my_digest = digest;
msg.putHeader(gms.getId(), hdr);
gms.getDownProtocol().down(new Event(Event.MSG, msg));
}
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 void testMergeWithAsymetricViewsCoordIsolated() {
// Isolate the coord
Address coord = a.getView().getCreator();
System.out.println("Isolating coord: " + coord);
List<Address> members = new ArrayList<>();
members.add(coord);
View coord_view = new View(coord, 4, members);
System.out.println("coord_view: " + coord_view);
Channel coord_channel = findChannel(coord);
System.out.println("coord_channel: " + coord_channel.getAddress());
MutableDigest digest = new MutableDigest(coord_view.getMembersRaw());
NAKACK2 nakack = (NAKACK2) coord_channel.getProtocolStack().findProtocol(NAKACK2.class);
digest.merge(nakack.getDigest(coord));
GMS gms = (GMS) coord_channel.getProtocolStack().findProtocol(GMS.class);
gms.installView(coord_view, digest);
System.out.println("gms.getView() " + gms.getView());
System.out.println("Views are:");
for (JChannel ch : Arrays.asList(a, b, c, d))
System.out.println(ch.getAddress() + ": " + ch.getView());
JChannel merge_leader = findChannel(coord);
MyReceiver receiver = new MyReceiver();
merge_leader.setReceiver(receiver);
System.out.println("merge_leader: " + merge_leader.getAddressAsString());
System.out.println("Injecting MERGE event into merge leader " + merge_leader.getAddress());
Map<Address, View> merge_views = new HashMap<>(4);
merge_views.put(a.getAddress(), a.getView());
merge_views.put(b.getAddress(), b.getView());
merge_views.put(c.getAddress(), c.getView());
merge_views.put(d.getAddress(), d.getView());
gms = (GMS) merge_leader.getProtocolStack().findProtocol(GMS.class);
gms.up(new Event(Event.MERGE, merge_views));
Util.waitUntilAllChannelsHaveSameSize(10000, 1000, a, b, c, d);
System.out.println("Views are:");
for (JChannel ch : Arrays.asList(a, b, c, d)) {
View view = ch.getView();
System.out.println(ch.getAddress() + ": " + view);
assert view.size() == 4;
}
MergeView merge_view = receiver.getView();
System.out.println("merge_view = " + merge_view);
assert merge_view.size() == 4;
assert merge_view.getSubgroups().size() == 2;
for (View view : merge_view.getSubgroups())
assert contains(view, a.getAddress())
|| contains(view, b.getAddress(), c.getAddress(), d.getAddress());
}
protected void sendMergeRejectedResponse(Address sender, MergeId merge_id) {
Message msg = new Message(sender, null, null);
msg.setFlag(Message.OOB);
GMS.GmsHeader hdr = new GMS.GmsHeader(GMS.GmsHeader.MERGE_RSP);
hdr.merge_rejected = true;
hdr.merge_id = merge_id;
msg.putHeader(gms.getId(), hdr);
if (log.isDebugEnabled()) log.debug("merge response=" + hdr);
gms.getDownProtocol().down(new Event(Event.MSG, msg));
}
/** Send back a response containing view and digest to sender */
private void sendMergeResponse(Address sender, View view, Digest digest, MergeId merge_id) {
Message msg = new Message(sender).setFlag(Message.Flag.OOB, Message.Flag.INTERNAL);
GMS.GmsHeader hdr = new GMS.GmsHeader(GMS.GmsHeader.MERGE_RSP);
hdr.merge_id = merge_id;
hdr.view = view;
hdr.my_digest = digest;
msg.putHeader(gms.getId(), hdr);
if (log.isTraceEnabled()) log.trace(gms.local_addr + ": sending merge response=" + hdr);
gms.getDownProtocol().down(new Event(Event.MSG, msg));
}
@BeforeClass
protected void setUp() throws Exception {
c1 = createChannel(true);
c1.setName("A");
GMS gms = (GMS) c1.getProtocolStack().findProtocol(GMS.class);
if (gms != null) gms.setPrintLocalAddress(false);
disableBundling(c1);
d1 = new MessageDispatcher(c1, null, null, null);
c1.connect("MessageDispatcherUnitTest");
}
private void sendMergeCancelledMessage(Collection<Address> coords, MergeId merge_id) {
if (coords == null || merge_id == null) return;
for (Address coord : coords) {
Message msg = new Message(coord);
// msg.setFlag(Message.Flag.OOB);
GMS.GmsHeader hdr = new GMS.GmsHeader(GMS.GmsHeader.CANCEL_MERGE);
hdr.merge_id = merge_id;
msg.putHeader(gms.getId(), hdr);
gms.getDownProtocol().down(new Event(Event.MSG, msg));
}
}
private static void createPartitions(JChannel... channels) throws Exception {
for (JChannel ch : channels) {
DISCARD discard = new DISCARD();
discard.setDiscardAll(true);
ch.getProtocolStack().insertProtocol(discard, ProtocolStack.Position.ABOVE, TP.class);
}
for (JChannel ch : channels) {
View view = View.create(ch.getAddress(), 10, ch.getAddress());
GMS gms = (GMS) ch.getProtocolStack().findProtocol(GMS.class);
gms.installView(view);
}
}
private void sendMergeCancelledMessage(Collection<Address> coords, MergeId merge_id) {
if (coords == null || merge_id == null) return;
for (Address coord : coords) {
Message msg = new Message(coord, null, null);
// msg.setFlag(Message.OOB);
GMS.GmsHeader hdr = new GMS.GmsHeader(GMS.GmsHeader.CANCEL_MERGE);
hdr.merge_id = merge_id;
msg.putHeader(gms.getId(), hdr);
if (log.isDebugEnabled()) log.debug(gms.local_addr + ": sending cancel merge to " + coord);
gms.getDownProtocol().down(new Event(Event.MSG, msg));
}
}
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);
}
/** Tests the scenario described by Dan in https://issues.jboss.org/browse/JGRP-1876 */
public void testJGRP_1876_Dan() throws Exception {
Util.close(d, c, b, a);
s = createChannel("S", true);
t = createChannel("T", true);
u = createChannel("U", true);
v = createChannel("V", true);
Util.waitUntilAllChannelsHaveSameSize(10000, 500, s, t, u, v);
enableInfoSender(false, s, t, u, v); // stops INFO sending in MERGE3
for (JChannel ch : Arrays.asList(s, t, u, v))
System.out.println(ch.getName() + ": " + ch.getView());
View v1 = View.create(s.getAddress(), 10, s.getAddress());
View v2 = View.create(t.getAddress(), 10, t.getAddress());
View v3 = View.create(u.getAddress(), 11, u.getAddress(), v.getAddress());
injectView(v1, s);
injectView(v2, t);
injectView(v3, u, v);
enableInfoSender(false, s, t, u, v); // stops INFO sending in MERGE3
Util.waitUntilAllChannelsHaveSameSize(10000, 500, s);
Util.waitUntilAllChannelsHaveSameSize(10000, 500, t);
Util.waitUntilAllChannelsHaveSameSize(10000, 500, u, v);
System.out.printf("\nPartitions:\n");
for (JChannel ch : Arrays.asList(s, t, u, v))
System.out.println(ch.getName() + ": " + ch.getView());
enableInfoSender(true, s, t, u, v);
System.out.println("\nEnabling INFO sending in merge protocols to merge subclusters");
Util.waitUntilAllChannelsHaveSameSize(30000, 1000, s, t, u, v);
System.out.println("\nResulting views:");
for (JChannel ch : Arrays.asList(s, t, u, v)) {
GMS gms = (GMS) ch.getProtocolStack().findProtocol(GMS.class);
View mv = gms.view();
System.out.println(mv);
}
for (JChannel ch : Arrays.asList(s, t, u, v)) {
GMS gms = (GMS) ch.getProtocolStack().findProtocol(GMS.class);
View mv = gms.view();
assert mv instanceof MergeView;
assert mv.size() == 4;
assert ((MergeView) mv).getSubgroups().size() == 3;
}
for (JChannel ch : Arrays.asList(s, t, u, v)) {
View view = ch.getView();
assert view.size() == 4 : "view should have 4 members: " + view;
}
}
void cancelMerge(MergeId id) {
if (setMergeId(id, null)) {
merge_task.stop();
merge_rsps.reset();
gms.getViewHandler().resume(id);
}
}
private static void mergePartitions(JChannel... channels) throws Exception {
Membership membership = new Membership();
for (JChannel ch : channels) {
membership.add(ch.getAddress());
}
membership.sort();
Address leaderAddress = membership.elementAt(0);
JChannel leader = findChannelByAddress(leaderAddress, channels);
GMS gms = (GMS) leader.getProtocolStack().findProtocol(GMS.class);
gms.setLevel("trace");
Map<Address, View> views = new HashMap<>();
for (JChannel ch : channels) {
views.put(ch.getAddress(), ch.getView());
}
gms.up(new Event(Event.MERGE, views));
}
/**
* Takes a membership of 10, e.g. {A,B,C,D,E,F,G,H,I,J}, creates multiple partitions (e.g.
* {A,B,C}, {D}, {E,F,G,H}, {I,J}), and merges them back into one cluster. Asserts that there's
* only 1 MergeView
*/
public void testMultipleSplits() throws Exception {
e = createChannel("E", true);
f = createChannel("F", true);
g = createChannel("G", true);
h = createChannel("H", true);
i = createChannel("I", true);
j = createChannel("J", true);
Util.waitUntilAllChannelsHaveSameSize(10000, 500, a, b, c, d, e, f, g, h, i, j);
enableInfoSender(false, a, b, c, d, e, f, g, h, i, j); // stops INFO sending in MERGE3
for (JChannel ch : Arrays.asList(a, b, c, d, e, f, g, h, i, j))
System.out.println(ch.getName() + ": " + ch.getView());
List<View> partitions = createPartitions(4, a, b, c, d, e, f, g, h, i, j);
// Install views
for (View partition : partitions) {
for (Address mbr : partition.getMembersRaw()) {
JChannel ch = findChannel(mbr);
injectView(partition, ch);
}
}
System.out.printf("\n%d partitions:\n", partitions.size());
for (JChannel ch : Arrays.asList(a, b, c, d, e, f, g, h, i, j))
System.out.println(ch.getName() + ": " + ch.getView());
System.out.println("\nEnabling INFO sending in merge protocols to merge subclusters");
enableInfoSender(true, a, b, c, d, e, f, g, h, i, j);
Util.waitUntilAllChannelsHaveSameSize(30000, 1000, a, b, c, d, e, f, g, h, i, j);
System.out.println("\nResulting views:");
for (JChannel ch : Arrays.asList(a, b, c, d, e, f, g, h, i, j)) {
GMS gms = (GMS) ch.getProtocolStack().findProtocol(GMS.class);
View mv = gms.view();
System.out.println(mv);
}
for (JChannel ch : Arrays.asList(a, b, c, d, e, f, g, h, i, j)) {
GMS gms = (GMS) ch.getProtocolStack().findProtocol(GMS.class);
View mv = gms.view();
assert mv instanceof MergeView;
assert mv.size() == 10;
assert ((MergeView) mv).getSubgroups().size() == partitions.size();
}
for (JChannel ch : Arrays.asList(a, b, c, d, e, f, g, h, i, j)) {
View view = ch.getView();
assert view.size() == 10 : "view should have 10 members: " + view;
}
}
public void handleMergeCancelled(MergeId merge_id) {
try {
gms.stopFlush();
} catch (Throwable t) {
log.error("stop flush failed", t);
}
if (log.isTraceEnabled()) log.trace(gms.local_addr + ": merge " + merge_id + " is cancelled");
cancelMerge(merge_id);
}
/** A: {A,B} B: {A,B} C: {C} C receives INFO from B only */
public void testMergeWithIncompleteInfos() throws Exception {
Util.close(d);
enableInfoSender(false, a, b, c);
View one = View.create(a.getAddress(), 10, a.getAddress(), b.getAddress());
View two = View.create(c.getAddress(), 10, c.getAddress());
injectView(one, a, b);
injectView(two, c);
enableInfoSender(false, a, b, c);
Util.waitUntilAllChannelsHaveSameSize(10000, 500, a, b);
Util.waitUntilAllChannelsHaveSameSize(10000, 500, c);
System.out.printf("\nPartitions:\n");
for (JChannel ch : Arrays.asList(a, b, c))
System.out.println(ch.getName() + ": " + ch.getView());
MERGE3.MergeHeader hdr = MERGE3.MergeHeader.createInfo(one.getViewId(), null, null);
Message msg =
new Message(null, b.getAddress(), null)
.putHeader(merge_id, hdr); // B sends the INFO message to C
Event merge_event = new Event(Event.MSG, msg);
MERGE3 merge = (MERGE3) c.getProtocolStack().findProtocol(MERGE3.class);
merge.up(merge_event);
enableInfoSender(true, a, b, c);
System.out.println("\nEnabling INFO sending in merge protocols to merge subclusters");
Util.waitUntilAllChannelsHaveSameSize(30000, 1000, a, b, c);
System.out.println("\nResulting views:");
for (JChannel ch : Arrays.asList(a, b, c)) {
GMS gms = (GMS) ch.getProtocolStack().findProtocol(GMS.class);
View mv = gms.view();
System.out.println(mv);
}
for (JChannel ch : Arrays.asList(a, b, c)) {
GMS gms = (GMS) ch.getProtocolStack().findProtocol(GMS.class);
View mv = gms.view();
assert mv instanceof MergeView;
assert mv.size() == 3;
assert ((MergeView) mv).getSubgroups().size() == 2;
}
for (JChannel ch : Arrays.asList(a, b, c)) {
View view = ch.getView();
assert view.size() == 3 : "view should have 3 members: " + view;
}
}
/**
* Multicasts a GET_DIGEST_REQ to all current members and waits for all responses (GET_DIGEST_RSP)
* or N ms.
*
* @return
*/
private Digest fetchDigestsFromAllMembersInSubPartition(
List<Address> current_mbrs, MergeId merge_id) {
// Optimization: if we're the only member, we don't need to multicast the get-digest message
if (current_mbrs == null
|| current_mbrs.size() == 1 && current_mbrs.get(0).equals(gms.local_addr))
return (Digest) gms.getDownProtocol().down(new Event(Event.GET_DIGEST, gms.local_addr));
GMS.GmsHeader hdr = new GMS.GmsHeader(GMS.GmsHeader.GET_DIGEST_REQ);
hdr.merge_id = merge_id;
Message get_digest_req =
new Message().setFlag(Message.Flag.OOB, Message.Flag.INTERNAL).putHeader(gms.getId(), hdr);
long max_wait_time =
gms.merge_timeout / 2; // gms.merge_timeout is guaranteed to be > 0, verified in init()
digest_collector.reset(current_mbrs);
gms.getDownProtocol().down(new Event(Event.MSG, get_digest_req));
// add my own digest first - the get_digest_req needs to be sent first *before* getting our own
// digest, so
// we have that message in our digest !
Digest digest =
(Digest) gms.getDownProtocol().down(new Event(Event.GET_DIGEST, gms.local_addr));
digest_collector.add(gms.local_addr, digest);
digest_collector.waitForAllResponses(max_wait_time);
if (log.isTraceEnabled()) {
if (digest_collector.hasAllResponses())
log.trace(gms.local_addr + ": fetched all digests for " + current_mbrs);
else
log.trace(
gms.local_addr
+ ": fetched incomplete digests (after timeout of "
+ max_wait_time
+ ") ms for "
+ current_mbrs);
}
Map<Address, Digest> responses = new HashMap<Address, Digest>(digest_collector.getResults());
MutableDigest retval = new MutableDigest(responses.size());
for (Digest dig : responses.values()) {
if (dig != null) retval.add(dig);
}
return retval;
}
private static void changeProperties(JChannel ch) {
ch.setOpt(Channel.AUTO_RECONNECT, true);
ProtocolStack stack = ch.getProtocolStack();
GMS gms = (GMS) stack.findProtocol("GMS");
if (gms != null) {
gms.setViewBundling(true);
gms.setMaxBundlingTime(300);
gms.setPrintLocalAddr(false);
}
MERGE2 merge = (MERGE2) stack.findProtocol("MERGE2");
if (merge != null) {
merge.setMinInterval(2000);
merge.setMaxInterval(5000);
}
VIEW_SYNC sync = (VIEW_SYNC) stack.findProtocol(VIEW_SYNC.class);
if (sync != null) sync.setAverageSendInterval(5000);
NAKACK nakack = (NAKACK) stack.findProtocol(NAKACK.class);
if (nakack != null) nakack.setLogDiscardMsgs(false);
}
protected void sendJoinRejectionMessage(Address dest, String error_msg) {
if (dest == null) return;
JoinRsp joinRes = new JoinRsp(error_msg); // specify the error message on the JoinRsp
Message msg =
new Message(dest)
.putHeader(gms_id, new GMS.GmsHeader(GMS.GmsHeader.JOIN_RSP))
.setBuffer(GMS.marshal(joinRes));
down_prot.down(new Event(Event.MSG, msg));
}
protected void sendJoinRejectionMessage(Address dest, String error_msg) {
if (dest == null) return;
JoinRsp joinRes = new JoinRsp(error_msg); // specify the error message on the JoinRsp
Message msg =
new Message(dest)
.putHeader(GMS_ID, new GMS.GmsHeader(GMS.GmsHeader.JOIN_RSP))
.setBuffer(GMS.marshal(joinRes));
if (this.authenticate_coord) msg.putHeader(this.id, new AuthHeader(this.auth_token));
down_prot.down(msg);
}
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();
}
}
private static JChannel createChannel(String channelName, String mech, String username)
throws Exception {
SASL sasl = new SASL();
sasl.setMech(mech);
sasl.setClientCallbackHandler(new MyCallbackHandler(username));
sasl.setServerCallbackHandler(new MyCallbackHandler(username));
sasl.setTimeout(5000);
sasl.sasl_props.put("com.sun.security.sasl.digest.realm", REALM);
sasl.setLevel("trace");
GMS gms = new GMS();
gms.setJoinTimeout(3000);
return new JChannel(
new Protocol[] {
new SHARED_LOOPBACK(),
new PING(),
new MERGE3(),
new NAKACK2(),
new UNICAST3(),
new STABLE(),
sasl,
gms
})
.name(channelName);
}
/**
* If merge_id is not equal to this.merge_id then discard. Else cast the view/digest to all
* members of this group.
*/
public void handleMergeView(final MergeData data, final MergeId merge_id) {
if (!matchMergeId(merge_id)) {
if (log.isTraceEnabled())
log.trace(
gms.local_addr
+ ": merge_ids (mine: "
+ this.merge_id
+ ", received: "
+ merge_id
+ ") don't match; merge view "
+ data.view.getViewId()
+ " is discarded");
return;
}
// only send to our *current* members, if we have A and B being merged (we are B), then we would
// *not*
// want to block on a VIEW_ACK from A because A doesn't see us in the pre-merge view yet and
// discards the view
List<Address> newViewMembers = new ArrayList<Address>(data.view.getMembers());
newViewMembers.removeAll(gms.members.getMembers());
try {
gms.castViewChange(data.view, data.digest, null, newViewMembers);
// if we have flush in stack send ack back to merge coordinator
if (gms.flushProtocolInStack) { // [JGRP-700] - FLUSH: flushing should span merge
Message ack =
new Message(data.getSender()).setFlag(Message.Flag.OOB, Message.Flag.INTERNAL);
GMS.GmsHeader ack_hdr = new GMS.GmsHeader(GMS.GmsHeader.INSTALL_MERGE_VIEW_OK);
ack.putHeader(gms.getId(), ack_hdr);
gms.getDownProtocol().down(new Event(Event.MSG, ack));
}
} finally {
cancelMerge(merge_id);
}
}
protected View getViewFromGMS(JChannel ch) {
GMS gms = (GMS) ch.getProtocolStack().findProtocol(GMS.class);
return gms.view();
}