Github user markap14 commented on a diff in the pull request:
https://github.com/apache/nifi/pull/323#discussion_r60782947
--- Diff:
nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-framework-cluster/src/main/java/org/apache/nifi/cluster/manager/impl/WebClusterManagerCoordinator.java
---
@@ -0,0 +1,164 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.nifi.cluster.manager.impl;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import org.apache.nifi.cluster.coordination.ClusterCoordinator;
+import org.apache.nifi.cluster.coordination.node.DisconnectionCode;
+import org.apache.nifi.cluster.coordination.node.NodeConnectionState;
+import org.apache.nifi.cluster.coordination.node.NodeConnectionStatus;
+import org.apache.nifi.cluster.node.Node;
+import org.apache.nifi.cluster.node.Node.Status;
+import org.apache.nifi.cluster.protocol.ConnectionRequest;
+import org.apache.nifi.cluster.protocol.NodeIdentifier;
+import org.apache.nifi.reporting.Severity;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class WebClusterManagerCoordinator implements ClusterCoordinator {
+ private static final Logger logger =
LoggerFactory.getLogger(WebClusterManagerCoordinator.class);
+
+ private final WebClusterManager clusterManager;
+
+ public WebClusterManagerCoordinator(final WebClusterManager
clusterManager) {
+ this.clusterManager = clusterManager;
+ }
+
+ @Override
+ public void requestNodeConnect(final NodeIdentifier nodeId) {
+ final Node node = clusterManager.getRawNode(nodeId.getId());
+
+ if (node == null) {
+ final ConnectionRequest connectionRequest = new
ConnectionRequest(nodeId);
+ clusterManager.requestConnection(connectionRequest);
+ } else {
+ node.setStatus(Status.DISCONNECTED);
+ clusterManager.requestReconnection(nodeId.getId(),
"Anonymous");
+ }
+ }
+
+ @Override
+ public void finishNodeConnection(final NodeIdentifier nodeId) {
+ final Node node = clusterManager.getRawNode(nodeId.getId());
+ if (node == null) {
+ logger.error("Attempting to Finish Node Connection but could
not find Node with Identifier {}", nodeId);
+ return;
+ }
+
+ node.setStatus(Status.CONNECTED);
+ }
+
+ @Override
+ public void requestNodeDisconnect(final NodeIdentifier nodeId, final
DisconnectionCode disconnectionCode, final String explanation) {
+ try {
+ clusterManager.requestDisconnection(nodeId, false,
explanation);
+
+ if (disconnectionCode == DisconnectionCode.LACK_OF_HEARTBEAT) {
+ final Node node =
clusterManager.getRawNode(nodeId.getId());
+ if (node != null) {
+ node.setHeartbeatDisconnection();
+ }
+ }
+ } catch (final Exception e) {
+ logger.error("Failed to request node {} disconnect from
cluster due to {}", nodeId, e);
+ logger.error("", e);
--- End diff --
The first line logs a toString() of the Exception, whereas the second line
logs the stack trace. Personally, I find the log messages easier to read this
way when someone copies & pastes it, as they often do not look to grab a stack
trace but if the toString() of the Exception is part of the original message,
it makes it more clear.
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