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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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+package org.apache.hadoop.hdfs.server.federation.router;
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+
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+import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_ROUTER_CACHE_TIME_TO_LIVE_MS;
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+import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_ROUTER_SAFEMODE_EXPIRATION;
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+import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_ROUTER_SAFEMODE_EXTENSION;
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+import static org.apache.hadoop.hdfs.server.federation.store.FederationStateStoreTestUtils.deleteStateStore;
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+import static org.apache.hadoop.hdfs.server.federation.store.FederationStateStoreTestUtils.getStateStoreConfiguration;
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+import static org.junit.Assert.assertEquals;
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+import static org.junit.Assert.assertFalse;
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+import static org.junit.Assert.assertTrue;
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+import static org.junit.Assert.fail;
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+
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+import java.io.IOException;
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+import java.net.URISyntaxException;
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+import java.util.concurrent.TimeUnit;
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+
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+import org.apache.hadoop.conf.Configuration;
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+import org.apache.hadoop.hdfs.server.federation.RouterConfigBuilder;
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+import org.apache.hadoop.service.Service.STATE;
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+import org.apache.hadoop.util.Time;
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+import org.junit.After;
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+import org.junit.AfterClass;
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+import org.junit.Before;
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+import org.junit.BeforeClass;
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+import org.junit.Test;
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+
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+/**
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+ * Test the safe mode for the {@link Router} controlled by
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+ * {@link RouterSafemodeService}.
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+ */
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+public class TestRouterSafemode {
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+
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+ private Router router;
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+ private static Configuration conf;
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+
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+ @BeforeClass
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+ public static void create() throws IOException {
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+ // Wipe state store
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+ deleteStateStore();
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+ // Configuration that supports the state store
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+ conf = getStateStoreConfiguration();
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+ // 2 sec startup standby
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+ conf.setTimeDuration(DFS_ROUTER_SAFEMODE_EXTENSION,
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+ TimeUnit.SECONDS.toMillis(2), TimeUnit.MILLISECONDS);
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+ // 1 sec cache refresh
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+ conf.setTimeDuration(DFS_ROUTER_CACHE_TIME_TO_LIVE_MS,
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+ TimeUnit.SECONDS.toMillis(1), TimeUnit.MILLISECONDS);
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+ // 2 sec post cache update before entering safemode (2 intervals)
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+ conf.setTimeDuration(DFS_ROUTER_SAFEMODE_EXPIRATION,
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+ TimeUnit.SECONDS.toMillis(2), TimeUnit.MILLISECONDS);
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+ // RPC + State Store + Safe Mode only
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+ conf = new RouterConfigBuilder(conf)
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+ .rpc()
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+ .safemode()
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+ .stateStore()
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+ .metrics()
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+ .build();
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+ }
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+
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+ @AfterClass
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+ public static void destroy() {
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+ }
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+
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+ @Before
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+ public void setup() throws IOException, URISyntaxException {
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+ router = new Router();
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+ router.init(conf);
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+ router.start();
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+ }
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+
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+ @After
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+ public void cleanup() throws IOException {
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+ if (router != null) {
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+ router.stop();
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+ router = null;
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+ }
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+ }
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+
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+ @Test
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+ public void testSafemodeService() throws IOException {
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+ RouterSafemodeService server = new RouterSafemodeService(router);
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+ server.init(conf);
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+ assertEquals(STATE.INITED, server.getServiceState());
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+ server.start();
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+ assertEquals(STATE.STARTED, server.getServiceState());
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+ server.stop();
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+ assertEquals(STATE.STOPPED, server.getServiceState());
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+ server.close();
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+ }
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+
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+ @Test
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+ public void testRouterExitSafemode()
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+ throws InterruptedException, IllegalStateException, IOException {
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+
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+ assertTrue(router.getRpcServer().isInSafeMode());
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+ verifyRouter(RouterServiceState.SAFEMODE);
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+
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+ // Wait for initial time in milliseconds
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+ long interval =
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+ conf.getTimeDuration(DFS_ROUTER_SAFEMODE_EXTENSION,
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+ TimeUnit.SECONDS.toMillis(2), TimeUnit.MILLISECONDS) +
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+ conf.getTimeDuration(DFS_ROUTER_CACHE_TIME_TO_LIVE_MS,
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+ TimeUnit.SECONDS.toMillis(1), TimeUnit.MILLISECONDS);
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+ Thread.sleep(interval);
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+
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+ assertFalse(router.getRpcServer().isInSafeMode());
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+ verifyRouter(RouterServiceState.RUNNING);
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+ }
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+
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+ @Test
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+ public void testRouterEnterSafemode()
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+ throws IllegalStateException, IOException, InterruptedException {
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+
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+ // Verify starting state
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+ assertTrue(router.getRpcServer().isInSafeMode());
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+ verifyRouter(RouterServiceState.SAFEMODE);
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+
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+ // We should be in safe mode for DFS_ROUTER_SAFEMODE_EXTENSION time
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+ long interval0 = conf.getTimeDuration(DFS_ROUTER_SAFEMODE_EXTENSION,
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+ TimeUnit.SECONDS.toMillis(2), TimeUnit.MILLISECONDS) - 1000;
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+ long t0 = Time.now();
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+ while (Time.now() - t0 < interval0) {
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+ verifyRouter(RouterServiceState.SAFEMODE);
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+ Thread.sleep(100);
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+ }
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+
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+ // We wait some time for the state to propagate
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+ long interval1 = 1000 + 2 * conf.getTimeDuration(
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+ DFS_ROUTER_CACHE_TIME_TO_LIVE_MS, TimeUnit.SECONDS.toMillis(1),
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+ TimeUnit.MILLISECONDS);
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+ Thread.sleep(interval1);
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+
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+ // Running
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+ assertFalse(router.getRpcServer().isInSafeMode());
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+ verifyRouter(RouterServiceState.RUNNING);
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+
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+ // Disable cache
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+ router.getStateStore().stopCacheUpdateService();
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+
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+ // Wait until the State Store cache is stale in milliseconds
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+ long interval2 =
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+ conf.getTimeDuration(DFS_ROUTER_SAFEMODE_EXPIRATION,
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+ TimeUnit.SECONDS.toMillis(2), TimeUnit.MILLISECONDS) +
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+ conf.getTimeDuration(DFS_ROUTER_CACHE_TIME_TO_LIVE_MS,
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+ TimeUnit.SECONDS.toMillis(1), TimeUnit.MILLISECONDS);
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+ Thread.sleep(interval2);
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+
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+ // Safemode
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+ assertTrue(router.getRpcServer().isInSafeMode());
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+ verifyRouter(RouterServiceState.SAFEMODE);
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+ }
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+
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+ @Test
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+ public void testRouterRpcSafeMode()
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+ throws IllegalStateException, IOException {
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+
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+ assertTrue(router.getRpcServer().isInSafeMode());
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+ verifyRouter(RouterServiceState.SAFEMODE);
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+
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+ // If the Router is in Safe Mode, we should get a SafeModeException
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+ boolean exception = false;
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+ try {
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+ router.getRpcServer().delete("/testfile.txt", true);
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+ fail("We should have thrown a safe mode exception");
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+ } catch (RouterSafeModeException sme) {
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+ exception = true;
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+ }
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+ assertTrue("We should have thrown a safe mode exception", exception);
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+ }
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+
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+ private void verifyRouter(RouterServiceState status)
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+ throws IllegalStateException, IOException {
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+ assertEquals(status, router.getRouterState());
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+ }
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+}
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Yiqun Lin