HDFS-8403. Eliminate retries in TestFileCreation#testOverwriteOpenForWrite. Contributed by Arpit Agarwal.

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -445,6 +445,9 @@ Release 2.8.0 - UNRELEASED
     HDFS-8371. Fix test failure in TestHdfsConfigFields for spanreceiver
     properties. (Ray Chiang via aajisaka)
 
+    HDFS-8403. Eliminate retries in TestFileCreation
+    #testOverwriteOpenForWrite. (Arpit Agarwal via wheat9)
+
 Release 2.7.1 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSClient.java

@@ -343,10 +343,13 @@ public class DFSClient implements java.io.Closeable, RemotePeerFactory,
       this.namenode = rpcNamenode;
       dtService = null;
     } else {
+      boolean noRetries = conf.getBoolean(
+          DFSConfigKeys.DFS_CLIENT_TEST_NO_PROXY_RETRIES,
+          DFSConfigKeys.DFS_CLIENT_TEST_NO_PROXY_RETRIES_DEFAULT);
       Preconditions.checkArgument(nameNodeUri != null,
           "null URI");
       proxyInfo = NameNodeProxies.createProxy(conf, nameNodeUri,
-          ClientProtocol.class, nnFallbackToSimpleAuth);
+          ClientProtocol.class, nnFallbackToSimpleAuth, !noRetries);
       this.dtService = proxyInfo.getDelegationTokenService();
       this.namenode = proxyInfo.getProxy();
     }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java

@@ -20,6 +20,7 @@ package org.apache.hadoop.hdfs;
 
 import java.util.concurrent.TimeUnit;
 
+import com.google.common.annotations.VisibleForTesting;
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.fs.CommonConfigurationKeys;
 import org.apache.hadoop.hdfs.client.HdfsClientConfigKeys;
@@ -994,6 +995,14 @@ public class DFSConfigKeys extends CommonConfigurationKeys {
   // For testing NN retry cache, we can set this property with positive value.
   public static final String  DFS_CLIENT_TEST_DROP_NAMENODE_RESPONSE_NUM_KEY = "dfs.client.test.drop.namenode.response.number";
   public static final int     DFS_CLIENT_TEST_DROP_NAMENODE_RESPONSE_NUM_DEFAULT = 0;
+
+  // Create a NN proxy without retries for testing.
+  @VisibleForTesting
+  public static final String  DFS_CLIENT_TEST_NO_PROXY_RETRIES =
+      "dfs.client.test.no.proxy.retries";
+  @VisibleForTesting
+  public static final boolean DFS_CLIENT_TEST_NO_PROXY_RETRIES_DEFAULT = false;
+
   public static final String  DFS_CLIENT_SLOW_IO_WARNING_THRESHOLD_KEY =
       "dfs.client.slow.io.warning.threshold.ms";
   public static final long    DFS_CLIENT_SLOW_IO_WARNING_THRESHOLD_DEFAULT = 30000;

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/NameNodeProxies.java

@@ -161,6 +161,31 @@ public class NameNodeProxies {
   public static <T> ProxyAndInfo<T> createProxy(Configuration conf,
       URI nameNodeUri, Class<T> xface, AtomicBoolean fallbackToSimpleAuth)
       throws IOException {
+    return createProxy(conf, nameNodeUri, xface, fallbackToSimpleAuth, true);
+  }
+
+  /**
+   * Creates the namenode proxy with the passed protocol. This will handle
+   * creation of either HA- or non-HA-enabled proxy objects, depending upon
+   * if the provided URI is a configured logical URI.
+   *
+   * @param conf the configuration containing the required IPC
+   *        properties, client failover configurations, etc.
+   * @param nameNodeUri the URI pointing either to a specific NameNode
+   *        or to a logical nameservice.
+   * @param xface the IPC interface which should be created
+   * @param fallbackToSimpleAuth set to true or false during calls to
+   *   indicate if a secure client falls back to simple auth
+   * @param withRetries certain interfaces have a non-standard retry policy
+   * @return an object containing both the proxy and the associated
+   *         delegation token service it corresponds to
+   * @throws IOException if there is an error creating the proxy
+   **/
+  @SuppressWarnings("unchecked")
+  public static <T> ProxyAndInfo<T> createProxy(Configuration conf,
+      URI nameNodeUri, Class<T> xface, AtomicBoolean fallbackToSimpleAuth,
+      boolean withRetries)
+      throws IOException {
     AbstractNNFailoverProxyProvider<T> failoverProxyProvider =
         createFailoverProxyProvider(conf, nameNodeUri, xface, true,
           fallbackToSimpleAuth);
@@ -168,7 +193,8 @@ public class NameNodeProxies {
     if (failoverProxyProvider == null) {
       // Non-HA case
       return createNonHAProxy(conf, NameNode.getAddress(nameNodeUri), xface,
-          UserGroupInformation.getCurrentUser(), true, fallbackToSimpleAuth);
+          UserGroupInformation.getCurrentUser(), withRetries,
+          fallbackToSimpleAuth);
     } else {
       // HA case
       DfsClientConf config = new DfsClientConf(conf);

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestFileCreation.java

@@ -65,6 +65,7 @@ import org.apache.hadoop.fs.InvalidPathException;
 import org.apache.hadoop.fs.ParentNotDirectoryException;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.permission.FsPermission;
+import org.apache.hadoop.hdfs.client.HdfsClientConfigKeys;
 import org.apache.hadoop.hdfs.client.HdfsDataOutputStream;
 import org.apache.hadoop.hdfs.protocol.Block;
 import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
@@ -73,6 +74,7 @@ import org.apache.hadoop.hdfs.protocol.HdfsConstants;
 import org.apache.hadoop.hdfs.protocol.LocatedBlock;
 import org.apache.hadoop.hdfs.protocol.LocatedBlocks;
 import org.apache.hadoop.hdfs.server.blockmanagement.BlockManager;
+import org.apache.hadoop.hdfs.server.common.HdfsServerConstants;
 import org.apache.hadoop.hdfs.server.datanode.DataNode;
 import org.apache.hadoop.hdfs.server.datanode.DataNodeTestUtils;
 import org.apache.hadoop.hdfs.server.datanode.SimulatedFSDataset;
@@ -377,6 +379,11 @@ public class TestFileCreation {
     Configuration conf = new HdfsConfiguration();
     SimulatedFSDataset.setFactory(conf);
     conf.setBoolean(DFSConfigKeys.DFS_PERMISSIONS_ENABLED_KEY, false);
+
+    // Force NameNodeProxies' createNNProxyWithClientProtocol to give
+    // up file creation after one failure.
+    conf.setBoolean(DFSConfigKeys.DFS_CLIENT_TEST_NO_PROXY_RETRIES, true);
+
     final MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).build();
     FileSystem fs = cluster.getFileSystem();
 
@@ -405,9 +412,8 @@ public class TestFileCreation {
       } catch (IOException abce) {
         GenericTestUtils.assertExceptionContains("Failed to CREATE_FILE", abce);
       }
-      // NameNodeProxies' createNNProxyWithClientProtocol has 5 retries.
       assertCounter("AlreadyBeingCreatedExceptionNumOps",
-          6L, getMetrics(metricsName));
+          1L, getMetrics(metricsName));
       FSDataOutputStream stm2 = fs2.create(p, true);
       stm2.write(2);
       stm2.close();