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+/**
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+ * Licensed to the Apache Software Foundation (ASF) under one
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+ * or more contributor license agreements. See the NOTICE file
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+ * distributed with this work for additional information
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+ * regarding copyright ownership. The ASF licenses this file
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+ * to you under the Apache License, Version 2.0 (the
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+ * "License"); you may not use this file except in compliance
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+ * with the License. You may obtain a copy of the License at
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+ *
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+ * http://www.apache.org/licenses/LICENSE-2.0
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+ *
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+ * Unless required by applicable law or agreed to in writing, software
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+ * distributed under the License is distributed on an "AS IS" BASIS,
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+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+ * See the License for the specific language governing permissions and
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+ * limitations under the License.
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+ */
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+
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+package org.apache.hadoop.yarn.client;
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+
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+import org.slf4j.Logger;
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+import org.slf4j.LoggerFactory;
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+import org.apache.hadoop.classification.InterfaceAudience;
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+import org.apache.hadoop.classification.InterfaceStability;
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+import org.apache.hadoop.conf.Configuration;
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+import org.apache.hadoop.io.retry.DefaultFailoverProxyProvider;
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+import org.apache.hadoop.ipc.RPC;
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+import org.apache.hadoop.yarn.conf.YarnConfiguration;
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+
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+import java.io.IOException;
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+import java.net.InetSocketAddress;
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+
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+/**
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+ * An implementation of {@link RMFailoverProxyProvider} which does nothing in
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+ * the event of failover, and always returns the same proxy object.
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+ * This is the default non-HA RM Failover proxy provider. It is used to replace
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+ * {@link DefaultFailoverProxyProvider} which was used as Yarn default non-HA.
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+ */
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+@InterfaceAudience.Private
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+@InterfaceStability.Unstable
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+public class DefaultNoHARMFailoverProxyProvider<T>
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+ implements RMFailoverProxyProvider<T> {
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+ private static final Logger LOG =
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+ LoggerFactory.getLogger(DefaultNoHARMFailoverProxyProvider.class);
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+
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+ protected T proxy;
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+ protected Class<T> protocol;
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+
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+ /**
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+ * Initialize internal data structures, invoked right after instantiation.
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+ *
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+ * @param conf Configuration to use
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+ * @param proxy The {@link RMProxy} instance to use
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+ * @param protocol The communication protocol to use
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+ */
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+ @Override
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+ public void init(Configuration conf, RMProxy<T> proxy,
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+ Class<T> protocol) {
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+ this.protocol = protocol;
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+ try {
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+ YarnConfiguration yarnConf = new YarnConfiguration(conf);
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+ InetSocketAddress rmAddress =
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+ proxy.getRMAddress(yarnConf, protocol);
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+ LOG.info("Connecting to ResourceManager at {}", rmAddress);
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+ this.proxy = proxy.getProxy(yarnConf, protocol, rmAddress);
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+ } catch (IOException ioe) {
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+ LOG.error("Unable to create proxy to the ResourceManager ", ioe);
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+ }
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+ }
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+
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+ @Override
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+ public Class<T> getInterface() {
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+ return protocol;
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+ }
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+
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+ @Override
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+ public ProxyInfo<T> getProxy() {
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+ return new ProxyInfo<T>(proxy, null);
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+ }
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+
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+ /**
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+ * PerformFailover does nothing in this class.
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+ * @param currentProxy
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+ */
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+ @Override
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+ public void performFailover(T currentProxy) {
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+ // Nothing to do.
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+ }
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+
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+ /**
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+ * Close the current proxy.
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+ * @throws IOException
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+ */
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+ @Override
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+ public void close() throws IOException {
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+ RPC.stopProxy(proxy);
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+ }
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+}
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RogPodge