RM资源状态保存空方法类

RM资源状态保存空方法类

ResourceManager/StateStore/NullRMStateStore.java

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+/*
+ * 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.hadoop.yarn.server.resourcemanager.recovery;
+
+
+import org.apache.hadoop.classification.InterfaceStability.Unstable;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.security.token.delegation.DelegationKey;
+import org.apache.hadoop.yarn.security.client.RMDelegationTokenIdentifier;
+import org.apache.hadoop.yarn.server.resourcemanager.recovery.records.impl.pb.ApplicationAttemptStateDataPBImpl;
+import org.apache.hadoop.yarn.server.resourcemanager.recovery.records.impl.pb.ApplicationStateDataPBImpl;
+
+//空RM信息状态保存类，不实现保存方法的任何操作
+@Unstable
+public class NullRMStateStore extends RMStateStore {
+
+  @Override
+  protected void initInternal(Configuration conf) throws Exception {
+    // Do nothing
+  }
+
+  @Override
+  protected void startInternal() throws Exception {
+    // Do nothing
+  }
+
+  @Override
+  protected void closeInternal() throws Exception {
+    // Do nothing
+  }
+
+  //不实现加载状态方法
+  @Override
+  public RMState loadState() throws Exception {
+    throw new UnsupportedOperationException("Cannot load state from null store");
+  }
+
+  //具体保存应用方法也不实现
+  @Override
+  protected void storeApplicationState(String appId,
+      ApplicationStateDataPBImpl appStateData) throws Exception {
+    // Do nothing
+  }
+
+  @Override
+  protected void storeApplicationAttemptState(String attemptId,
+      ApplicationAttemptStateDataPBImpl attemptStateData) throws Exception {
+    // Do nothing
+  }
+
+  @Override
+  protected void removeApplicationState(ApplicationState appState)
+      throws Exception {
+    // Do nothing
+  }
+
+  @Override
+  public void storeRMDelegationTokenAndSequenceNumberState(
+      RMDelegationTokenIdentifier rmDTIdentifier, Long renewDate,
+      int latestSequenceNumber) throws Exception {
+    // Do nothing
+  }
+
+  @Override
+  public void removeRMDelegationTokenState(RMDelegationTokenIdentifier rmDTIdentifier)
+      throws Exception {
+    // Do nothing
+  }
+
+  @Override
+  public void storeRMDTMasterKeyState(DelegationKey delegationKey) throws Exception {
+    // Do nothing
+  }
+
+  @Override
+  public void removeRMDTMasterKeyState(DelegationKey delegationKey) throws Exception {
+    // Do nothing
+  }
+}