[GitHub] [hadoop] goiri commented on a change in pull request #2605: HDFS-15423 RBF: WebHDFS create shouldn't choose DN from all sub-clusters

[GitBox <gi...@apache.org>]

goiri commented on a change in pull request #2605:
URL: https://github.com/apache/hadoop/pull/2605#discussion_r577077150



##########
File path: hadoop-hdfs-project/hadoop-hdfs-rbf/src/test/java/org/apache/hadoop/hdfs/server/federation/router/TestRouterWebHdfsMethods.java
##########
@@ -0,0 +1,143 @@
+/**
+ * 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.hdfs.server.federation.router;
+
+import static org.apache.hadoop.hdfs.server.federation.FederationTestUtils.createMountTableEntry;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.fail;
+
+import java.io.FileNotFoundException;
+import java.net.HttpURLConnection;
+import java.net.URL;
+import java.util.Collections;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.hdfs.server.federation.MiniRouterDFSCluster.RouterContext;
+import org.apache.hadoop.hdfs.server.federation.RouterConfigBuilder;
+import org.apache.hadoop.hdfs.server.federation.StateStoreDFSCluster;
+import org.apache.hadoop.hdfs.server.federation.resolver.order.DestinationOrder;
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Test suite for Router Web Hdfs methods.
+ */
+public class TestRouterWebHdfsMethods {
+  static final Logger LOG =
+      LoggerFactory.getLogger(TestRouterWebHdfsMethods.class);
+
+  private static StateStoreDFSCluster cluster;
+  private static RouterContext router;
+  private static String httpUri;
+
+  @BeforeClass
+  public static void globalSetUp() throws Exception {
+    cluster = new StateStoreDFSCluster(false, 2);
+    Configuration conf = new RouterConfigBuilder()
+        .stateStore()
+        .rpc()
+        .http()
+        .admin()
+        .build();
+    cluster.addRouterOverrides(conf);
+    cluster.startCluster();
+    cluster.startRouters();
+    cluster.waitClusterUp();
+    router = cluster.getRandomRouter();
+    httpUri = "http://"+router.getHttpAddress();
+  }
+
+  @AfterClass
+  public static void tearDown() {
+    if (cluster != null) {
+      cluster.shutdown();
+      cluster = null;
+    }
+  }
+
+  @Test
+  public void testWebHdfsCreate() throws Exception {
+    // the file is created at default ns (ns0)
+    String path = "/tmp/file";
+    URL url = new URL(getUri(path));
+    LOG.info("URL: {}", url);
+    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
+    conn.setRequestMethod("PUT");
+    assertEquals(HttpURLConnection.HTTP_CREATED, conn.getResponseCode());
+    verifyFile("ns0", path, true);
+    verifyFile("ns1", path, false);
+    conn.disconnect();
+  }
+
+  @Test
+  public void testWebHdfsCreateWithMounts() throws Exception {
+    // the file is created at mounted ns (ns1)
+    String mountPoint = "/tmp-ns1";
+    String path = "/tmp-ns1/file";
+    createMountTableEntry(
+        router.getRouter(), mountPoint,
+        DestinationOrder.RANDOM, Collections.singletonList("ns1"));
+    URL url = new URL(getUri(path));
+    LOG.info("URL: {}", url);
+    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
+    conn.setRequestMethod("PUT");
+    assertEquals(HttpURLConnection.HTTP_CREATED, conn.getResponseCode());
+    verifyFile("ns1", path, true);
+    verifyFile("ns0", path, false);
+    conn.disconnect();
+  }
+
+  private String getUri(String path) {
+    final String user = System.getProperty("user.name");
+    final StringBuilder uri = new StringBuilder(httpUri);
+    uri.append("/webhdfs/v1").
+        append(path).
+        append("?op=CREATE").
+        append("&user.name=" + user);
+    return uri.toString();
+  }
+
+  private void verifyFile(String ns, String path, boolean shouldExist)
+      throws Exception {
+    FileSystem fs = cluster.getNamenode(ns, null).getFileSystem();
+    try {
+      fs.getFileStatus(new Path(path));
+      if (!shouldExist) {
+        fail(path + " should not exist in ns " + ns);
+      }
+    } catch (FileNotFoundException e) {
+      if (shouldExist) {
+        fail(path + " should exist in ns " + ns);
+      }
+    }
+  }
+
+  @Test
+  public void testGetNsFromDataNodeNetworkLocation() {
+    assertEquals("ns0", RouterWebHdfsMethods
+        .getNsFromDataNodeNetworkLocation("/ns0/rack-info1"));

Review comment:
       Add a couple more, for example:
   /ns0/row1/rack2
   /rack2

##########
File path: hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterWebHdfsMethods.java
##########
@@ -453,21 +456,33 @@ private DatanodeInfo chooseDatanode(final Router router,
       final String path, final HttpOpParam.Op op, final long openOffset,
       final String excludeDatanodes) throws IOException {
     final RouterRpcServer rpcServer = getRPCServer(router);
-    DatanodeInfo[] dns = null;
+    DatanodeInfo[] dns = {};
+    String resolvedNs = "";
     try {
       dns = rpcServer.getCachedDatanodeReport(DatanodeReportType.LIVE);
     } catch (IOException e) {
       LOG.error("Cannot get the datanodes from the RPC server", e);
     }
 
+    if (op == PutOpParam.Op.CREATE) {
+      try {
+        resolvedNs = rpcServer.getCreateLocation(path).getNameserviceId();
+      } catch (IOException e) {
+        LOG.error("Cannot get the name service " +

Review comment:
       Use logger format: LOG.error("Cannot get the name service to create file for path {}", path, e);




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