sashapolo commented on code in PR #722:
URL: https://github.com/apache/ignite-3/pull/722#discussion_r845221297
##########
modules/cluster-management/src/main/java/org/apache/ignite/internal/cluster/management/ClusterManagementGroupManager.java:
##########
@@ -133,90 +138,377 @@ public void initCluster(Collection<String>
metaStorageNodeNames, Collection<Stri
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
- throw new IgniteInternalException("Interrupted while initializing
the cluster", e);
+ throw new InitException("Interrupted while initializing the
cluster", e);
} catch (ExecutionException e) {
- throw new IgniteInternalException("Unable to initialize the
cluster", e.getCause());
+ throw new InitException("Unable to initialize the cluster",
e.getCause());
} finally {
busyLock.leaveBusy();
}
}
- private void handleInit(CmgInitMessage msg, NetworkAddress addr, long
correlationId) throws NodeStoppingException {
- List<ClusterNode> nodes = resolveNodes(clusterService, msg.cmgNodes());
+ @Override
+ public void start() {
+ var messageHandlerFactory = new CmgMessageHandlerFactory(busyLock,
msgFactory, clusterService);
+
+ // register the ClusterState handler first, because local state
recovery might send such messages
+ clusterService.messagingService().addMessageHandler(
+ CmgMessageGroup.class,
+ messageHandlerFactory.wrapHandler((message, senderAddr,
correlationId) -> {
+ if (message instanceof ClusterStateMessage) {
+ assert correlationId != null;
- raftManager.prepareRaftGroup(CMG_RAFT_GROUP_NAME, nodes,
CmgRaftGroupListener::new)
- .whenComplete((service, e) -> {
- MessagingService messagingService =
clusterService.messagingService();
+ handleClusterState((ClusterStateMessage) message,
senderAddr, correlationId);
+ }
+ })
+ );
- if (e == null) {
- ClusterNode leader = getLeader(service);
+ raftService = recoverLocalState();
- ClusterNode thisNode =
clusterService.topologyService().localMember();
+ // register the Init handler second in order to handle the command
differently, depending on the local state
+ clusterService.messagingService().addMessageHandler(
+ CmgMessageGroup.class,
+ messageHandlerFactory.wrapHandler((message, senderAddr,
correlationId) -> {
+ if (message instanceof CancelInitMessage) {
+ handleCancelInit((CancelInitMessage) message);
+ } else if (message instanceof CmgInitMessage) {
+ assert correlationId != null;
- messagingService.respond(addr,
successResponse(msgFactory), correlationId);
+ handleInit((CmgInitMessage) message, senderAddr,
correlationId);
+ }
+ })
+ );
- if (leader.equals(thisNode)) {
- broadcastClusterState(msg.metaStorageNodes());
+ restComponent.registerHandlers(routes ->
+ routes.post(REST_ENDPOINT, APPLICATION_JSON.toString(), new
InitCommandHandler(clusterInitializer))
+ );
+ }
+
+ /**
+ * Extracts the local state (if any) and starts the CMG.
+ *
+ * @return Future that resolves into the CMG Raft service or {@code null}
the local state is empty.
+ */
+ @Nullable
+ private CompletableFuture<CmgRaftService> recoverLocalState() {
+ Collection<String> cmgNodes;
+
+ try {
+ cmgNodes = localStateStorage.cmgNodeNames().get();
+ } catch (InterruptedException e) {
+ Thread.currentThread().interrupt();
+
+ throw new IgniteInternalException("Interrupted while retrieving
local CMG state", e);
+ } catch (ExecutionException e) {
+ throw new IgniteInternalException("Error while retrieving local
CMG state", e);
+ }
+
+ if (cmgNodes.isEmpty()) {
+ return null;
+ }
+
+ return startCmgRaftService(cmgNodes)
+ .thenCompose(service -> {
+ log.info("Local CMG state recovered");
+
+ return service.isCurrentNodeLeader()
+ .thenCompose(isLeader -> {
+ if (isLeader) {
+ return service.readClusterState()
+ // Raft state might not have been
initialized in case of leader failure during cluster init
+ .thenCompose(state -> state ==
null ? completedFuture(null) : onLeaderElected(service, state));
+ } else {
+ return completedFuture(null);
+ }
+ })
+ .thenApply(v -> service);
+ });
+ }
+
+ /**
+ * Handles the Init command.
+ *
+ * <p>This method needs to take the following possibilities into account,
depending on the local state and the Raft state:
+ * <ol>
+ * <li>No local state found - this means that the current node has
never been initialized before.</li>
+ * <li>Local state found, but no CMG state present in the Raft storage
- this means that the node has failed somewhere during
+ * the init process. In this case we need to check the consistency of
the local state and the received message and complete
+ * the init process.</li>
+ * <li>Local state found and CMG state is present in the Raft storage
- this means that the node has been initialized successfully
+ * and a user may be retrying the init in case the successful response
was lost. To make the init message idempotent
+ * we simply check that the Raft state and the received message are
the same.</li>
+ * </ol>
+ */
+ private void handleInit(CmgInitMessage msg, NetworkAddress addr, long
correlationId) {
+ var newState = new ClusterState(msg.cmgNodes(),
msg.metaStorageNodes());
+
+ CompletableFuture<CmgRaftService> raftService = this.raftService;
+
+ // This future is needed to add a completion listener at the end of
the method
+ CompletableFuture<?> resultHook;
+
+ if (raftService == null) {
+ // Raft service has not been started
+ log.info("Init command received, starting the CMG: " + newState);
+
+ raftService = initCmgRaftService(newState);
+
+ this.raftService = raftService;
+
+ resultHook = raftService;
+ } else {
+ // Raft service has been started, which means that this node has
already received an init command at least once, but
+ // we still need to check that the initialization has completed
successfully.
+ log.info("Init command received, but the CMG has already been
started");
+
+ resultHook = raftService.thenCompose(service ->
Review Comment:
No, because in the first `if` branch the Raft service is not started yet and
we start it there. In this branch the Raft service has already been started
(and this future only represents the state of the Raft service), so we only add
some async hooks that should send a response to the user upon completion.
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