HDFS-16821: Fixes regression in HDFS-13522 that enables observer reads by default (#5078)

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/NameNodeProxiesClient.java

@@ -349,9 +349,6 @@ public class NameNodeProxiesClient {
       boolean withRetries, AtomicBoolean fallbackToSimpleAuth,
       AlignmentContext alignmentContext)
       throws IOException {
-    if (alignmentContext == null) {
-      alignmentContext = new ClientGSIContext();
-    }
     RPC.setProtocolEngine(conf, ClientNamenodeProtocolPB.class,
         ProtobufRpcEngine2.class);
 

hadoop-hdfs-project/hadoop-hdfs-rbf/src/test/java/org/apache/hadoop/hdfs/server/federation/MiniRouterDFSCluster.java

@@ -91,6 +91,7 @@ import org.apache.hadoop.hdfs.server.federation.router.RouterRpcServer;
 import org.apache.hadoop.hdfs.server.namenode.FSImage;
 import org.apache.hadoop.hdfs.server.namenode.NameNode;
 import org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider;
+import org.apache.hadoop.hdfs.server.namenode.ha.ObserverReadProxyProvider;
 import org.apache.hadoop.hdfs.server.protocol.NamespaceInfo;
 import org.apache.hadoop.http.HttpConfig;
 import org.apache.hadoop.net.NetUtils;
@@ -233,6 +234,20 @@ public class MiniRouterDFSCluster {
       return DistributedFileSystem.get(conf);
     }
 
+    public FileSystem getFileSystemWithObserverReadsEnabled() throws IOException {
+      Configuration observerReadConf = new Configuration(conf);
+      observerReadConf.set(DFS_NAMESERVICES,
+          observerReadConf.get(DFS_NAMESERVICES)+ ",router-service");
+      observerReadConf.set(DFS_HA_NAMENODES_KEY_PREFIX + ".router-service", "router1");
+      observerReadConf.set(DFS_NAMENODE_RPC_ADDRESS_KEY+ ".router-service.router1",
+          getFileSystemURI().toString());
+      observerReadConf.set(HdfsClientConfigKeys.Failover.PROXY_PROVIDER_KEY_PREFIX
+          + "." + "router-service", ObserverReadProxyProvider.class.getName());
+      DistributedFileSystem.setDefaultUri(observerReadConf, "hdfs://router-service");
+
+      return DistributedFileSystem.get(observerReadConf);
+    }
+
     public DFSClient getClient(UserGroupInformation user)
         throws IOException, URISyntaxException, InterruptedException {
 

hadoop-hdfs-project/hadoop-hdfs-rbf/src/test/java/org/apache/hadoop/hdfs/server/federation/router/TestObserverWithRouter.java

@@ -21,6 +21,7 @@ import static org.apache.hadoop.hdfs.server.federation.FederationTestUtils.NAMEN
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotEquals;
 import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.assertThrows;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_HA_NAMENODE_ID_KEY;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMESERVICE_ID;
 import static org.apache.hadoop.hdfs.server.federation.router.RBFConfigKeys.DFS_ROUTER_MONITOR_NAMENODE;
@@ -41,15 +42,40 @@ import org.apache.hadoop.hdfs.server.federation.resolver.FederationNamenodeConte
 import org.apache.hadoop.hdfs.server.federation.resolver.FederationNamenodeServiceState;
 import org.apache.hadoop.hdfs.server.federation.resolver.MembershipNamenodeResolver;
 import org.apache.hadoop.hdfs.server.namenode.NameNode;
-import org.junit.After;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Tag;
+import org.junit.jupiter.api.TestInfo;
 
-public class TestObserverWithRouter {
 
+public class TestObserverWithRouter {
+  private static final String SKIP_BEFORE_EACH_CLUSTER_STARTUP = "SkipBeforeEachClusterStartup";
   private MiniRouterDFSCluster cluster;
+  private RouterContext routerContext;
+  private FileSystem fileSystem;
 
-  public void startUpCluster(int numberOfObserver) throws Exception {
-    startUpCluster(numberOfObserver, null);
+  @BeforeEach
+  void init(TestInfo info) throws Exception {
+    if (info.getTags().contains(SKIP_BEFORE_EACH_CLUSTER_STARTUP)) {
+      return;
+    }
+    startUpCluster(2, null);
+  }
+
+  @AfterEach
+  public void teardown() throws IOException {
+    if (cluster != null) {
+      cluster.shutdown();
+      cluster = null;
+    }
+
+    routerContext = null;
+
+    if (fileSystem != null) {
+      fileSystem.close();
+      fileSystem = null;
+    }
   }
 
   public void startUpCluster(int numberOfObserver, Configuration confOverrides) throws Exception {
@@ -95,31 +121,39 @@ public class TestObserverWithRouter {
     cluster.installMockLocations();
 
     cluster.waitActiveNamespaces();
+    routerContext  = cluster.getRandomRouter();
+    fileSystem = routerContext.getFileSystemWithObserverReadsEnabled();
   }
 
-  @After
-  public void teardown() throws IOException {
-    if (cluster != null) {
-      cluster.shutdown();
-      cluster = null;
-    }
+  @Test
+  public void testObserverRead() throws Exception {
+    internalTestObserverRead();
   }
 
+  /**
+   * Tests that without adding config to use ObserverProxyProvider, the client shouldn't
+   * have reads served by Observers.
+   * Fixes regression in HDFS-13522.
+   */
   @Test
-  public void testObserverRead() throws Exception {
-    startUpCluster(1);
-    RouterContext routerContext = cluster.getRandomRouter();
+  public void testReadWithoutObserverClientConfigurations() throws Exception {
+    fileSystem.close();
+    fileSystem = routerContext.getFileSystem();
+    assertThrows(AssertionError.class, this::internalTestObserverRead);
+  }
+
+  public void internalTestObserverRead()
+      throws Exception {
     List<? extends FederationNamenodeContext> namenodes = routerContext
         .getRouter().getNamenodeResolver()
         .getNamenodesForNameserviceId(cluster.getNameservices().get(0), true);
     assertEquals("First namenode should be observer", namenodes.get(0).getState(),
         FederationNamenodeServiceState.OBSERVER);
-    FileSystem fileSystem = routerContext.getFileSystem();
     Path path = new Path("/testFile");
-    // Send Create call to active
+    // Send create call
     fileSystem.create(path).close();
 
-    // Send read request to observer
+    // Send read request
     fileSystem.open(path).close();
 
     long rpcCountForActive = routerContext.getRouter().getRpcServer()
@@ -131,21 +165,19 @@ public class TestObserverWithRouter {
         .getRPCMetrics().getObserverProxyOps();
     // getBlockLocations should be sent to observer
     assertEquals("One call should be sent to observer", 1, rpcCountForObserver);
-    fileSystem.close();
   }
 
   @Test
+  @Tag(SKIP_BEFORE_EACH_CLUSTER_STARTUP)
   public void testObserverReadWithoutFederatedStatePropagation() throws Exception {
     Configuration confOverrides = new Configuration(false);
     confOverrides.setInt(RBFConfigKeys.DFS_ROUTER_OBSERVER_FEDERATED_STATE_PROPAGATION_MAXSIZE, 0);
-    startUpCluster(1, confOverrides);
-    RouterContext routerContext = cluster.getRandomRouter();
+    startUpCluster(2, confOverrides);
     List<? extends FederationNamenodeContext> namenodes = routerContext
         .getRouter().getNamenodeResolver()
         .getNamenodesForNameserviceId(cluster.getNameservices().get(0), true);
     assertEquals("First namenode should be observer", namenodes.get(0).getState(),
         FederationNamenodeServiceState.OBSERVER);
-    FileSystem fileSystem = routerContext.getFileSystem();
     Path path = new Path("/testFile");
     // Send Create call to active
     fileSystem.create(path).close();
@@ -161,22 +193,19 @@ public class TestObserverWithRouter {
     long rpcCountForObserver = routerContext.getRouter().getRpcServer()
         .getRPCMetrics().getObserverProxyOps();
     assertEquals("No call should be sent to observer", 0, rpcCountForObserver);
-    fileSystem.close();
   }
 
   @Test
+  @Tag(SKIP_BEFORE_EACH_CLUSTER_STARTUP)
   public void testDisablingObserverReadUsingNameserviceOverride() throws Exception {
     // Disable observer reads using per-nameservice override
     Configuration confOverrides = new Configuration(false);
     confOverrides.set(RBFConfigKeys.DFS_ROUTER_OBSERVER_READ_OVERRIDES, "ns0");
-    startUpCluster(1, confOverrides);
+    startUpCluster(2, confOverrides);
 
-    RouterContext routerContext = cluster.getRandomRouter();
-    FileSystem fileSystem = routerContext.getFileSystem();
     Path path = new Path("/testFile");
     fileSystem.create(path).close();
     fileSystem.open(path).close();
-    fileSystem.close();
 
     long rpcCountForActive = routerContext.getRouter().getRpcServer()
         .getRPCMetrics().getActiveProxyOps();
@@ -190,17 +219,15 @@ public class TestObserverWithRouter {
 
   @Test
   public void testReadWhenObserverIsDown() throws Exception {
-    startUpCluster(1);
-    RouterContext routerContext = cluster.getRandomRouter();
-    FileSystem fileSystem = routerContext.getFileSystem();
     Path path = new Path("/testFile1");
     // Send Create call to active
     fileSystem.create(path).close();
 
     // Stop observer NN
     int nnIndex = stopObserver(1);
-
     assertNotEquals("No observer found", 3, nnIndex);
+    nnIndex = stopObserver(1);
+    assertNotEquals("No observer found", 4, nnIndex);
 
     // Send read request
     fileSystem.open(path).close();
@@ -215,14 +242,10 @@ public class TestObserverWithRouter {
         .getRPCMetrics().getObserverProxyOps();
     assertEquals("No call should send to observer", 0,
         rpcCountForObserver);
-    fileSystem.close();
   }
 
   @Test
   public void testMultipleObserver() throws Exception {
-    startUpCluster(2);
-    RouterContext routerContext = cluster.getRandomRouter();
-    FileSystem fileSystem = routerContext.getFileSystem();
     Path path = new Path("/testFile1");
     // Send Create call to active
     fileSystem.create(path).close();
@@ -267,7 +290,6 @@ public class TestObserverWithRouter {
         .getRpcServer().getRPCMetrics().getObserverProxyOps();
     assertEquals("No call should send to observer",
         expectedObserverRpc, rpcCountForObserver);
-    fileSystem.close();
   }
 
   private int stopObserver(int num) {
@@ -288,9 +310,9 @@ public class TestObserverWithRouter {
   // test router observer with multiple to know which observer NN received
   // requests
   @Test
+  @Tag(SKIP_BEFORE_EACH_CLUSTER_STARTUP)
   public void testMultipleObserverRouter() throws Exception {
     StateStoreDFSCluster innerCluster;
-    RouterContext routerContext;
     MembershipNamenodeResolver resolver;
 
     String ns0;
@@ -356,14 +378,12 @@ public class TestObserverWithRouter {
         namespaceInfo0.get(1).getNamenodeId());
     assertEquals(namespaceInfo1.get(0).getState(),
         FederationNamenodeServiceState.OBSERVER);
+
+    innerCluster.shutdown();
   }
 
   @Test
   public void testUnavailableObserverNN() throws Exception {
-    startUpCluster(2);
-    RouterContext routerContext = cluster.getRandomRouter();
-    FileSystem fileSystem = routerContext.getFileSystem();
-
     stopObserver(2);
 
     Path path = new Path("/testFile");
@@ -397,12 +417,10 @@ public class TestObserverWithRouter {
     assertTrue("There must be unavailable namenodes", hasUnavailable);
   }
 
+
+
   @Test
   public void testRouterMsync() throws Exception {
-    startUpCluster(1);
-    RouterContext routerContext = cluster.getRandomRouter();
-
-    FileSystem fileSystem = routerContext.getFileSystem();
     Path path = new Path("/testFile");
 
     // Send Create call to active
@@ -420,6 +438,5 @@ public class TestObserverWithRouter {
     // 2 msync calls should be sent. One to each active namenode in the two namespaces.
     assertEquals("Four calls should be sent to active", 4,
         rpcCountForActive);
-    fileSystem.close();
   }
 }