HDFS-10903. Replace config key literal strings with config key names II: hadoop hdfs. Contributed by Chen Liang

(cherry picked from commit b36aaa913c54829adbf5fa852af7f45be4db0f07)

hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/fs/http/server/FSOperations.java

@@ -46,6 +46,9 @@ import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
 
+import static org.apache.hadoop.hdfs.DFSConfigKeys.HTTPFS_BUFFER_SIZE_KEY;
+import static org.apache.hadoop.hdfs.DFSConfigKeys.HTTP_BUFFER_SIZE_DEFAULT;
+
 /**
  * FileSystem operation executors used by {@link HttpFSServer}.
  */
@@ -439,7 +442,8 @@ public class FSOperations {
         blockSize = fs.getDefaultBlockSize(path);
       }
       FsPermission fsPermission = new FsPermission(permission);
-      int bufferSize = fs.getConf().getInt("httpfs.buffer.size", 4096);
+      int bufferSize = fs.getConf().getInt(HTTPFS_BUFFER_SIZE_KEY,
+          HTTP_BUFFER_SIZE_DEFAULT);
       OutputStream os = fs.create(path, fsPermission, override, bufferSize, replication, blockSize, null);
       IOUtils.copyBytes(is, os, bufferSize, true);
       os.close();
@@ -690,7 +694,8 @@ public class FSOperations {
      */
     @Override
     public InputStream execute(FileSystem fs) throws IOException {
-      int bufferSize = HttpFSServerWebApp.get().getConfig().getInt("httpfs.buffer.size", 4096);
+      int bufferSize = HttpFSServerWebApp.get().getConfig().getInt(
+          HTTPFS_BUFFER_SIZE_KEY, HTTP_BUFFER_SIZE_DEFAULT);
       return fs.open(path, bufferSize);
     }
 

hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/lib/service/hadoop/FileSystemAccessService.java

@@ -50,6 +50,8 @@ import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicInteger;
 
+import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.HADOOP_SECURITY_AUTHENTICATION;
+
 @InterfaceAudience.Private
 public class FileSystemAccessService extends BaseService implements FileSystemAccess {
   private static final Logger LOG = LoggerFactory.getLogger(FileSystemAccessService.class);
@@ -159,7 +161,7 @@ public class FileSystemAccessService extends BaseService implements FileSystemAc
         throw new ServiceException(FileSystemAccessException.ERROR.H01, KERBEROS_PRINCIPAL);
       }
       Configuration conf = new Configuration();
-      conf.set("hadoop.security.authentication", "kerberos");
+      conf.set(HADOOP_SECURITY_AUTHENTICATION, "kerberos");
       UserGroupInformation.setConfiguration(conf);
       try {
         UserGroupInformation.loginUserFromKeytab(principal, keytab);
@@ -169,7 +171,7 @@ public class FileSystemAccessService extends BaseService implements FileSystemAc
       LOG.info("Using FileSystemAccess Kerberos authentication, principal [{}] keytab [{}]", principal, keytab);
     } else if (security.equals("simple")) {
       Configuration conf = new Configuration();
-      conf.set("hadoop.security.authentication", "simple");
+      conf.set(HADOOP_SECURITY_AUTHENTICATION, "simple");
       UserGroupInformation.setConfiguration(conf);
       LOG.info("Using FileSystemAccess simple/pseudo authentication, principal [{}]", System.getProperty("user.name"));
     } else {

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

@@ -909,6 +909,10 @@ public class DFSConfigKeys extends CommonConfigurationKeys {
       DFS_DATANODE_TRANSFER_SOCKET_RECV_BUFFER_SIZE_DEFAULT =
       HdfsConstants.DEFAULT_DATA_SOCKET_SIZE;
 
+  public static final String HTTPFS_BUFFER_SIZE_KEY =
+      "httpfs.buffer.size";
+  public static final int HTTP_BUFFER_SIZE_DEFAULT = 4096;
+
   // dfs.client.retry confs are moved to HdfsClientConfigKeys.Retry 
   @Deprecated
   public static final String  DFS_CLIENT_RETRY_POLICY_ENABLED_KEY

hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml

@@ -3053,4 +3053,11 @@
       call queue</description>
   </property>
 
+  <property>
+    <name>httpfs.buffer.size</name>
+    <value>4096</value>
+    <description>
+    The size buffer to be used when creating or opening httpfs filesystem IO stream.
+    </description>
+  </property>
 </configuration>

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestFileAppend4.java

@@ -17,6 +17,7 @@
  */
 package org.apache.hadoop.hdfs;
 
+import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.IPC_CLIENT_CONNECT_MAX_RETRIES_KEY;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
@@ -89,7 +90,7 @@ public class TestFileAppend4 {
     
     // handle failures in the DFSClient pipeline quickly
     // (for cluster.shutdown(); fs.close() idiom)
-    conf.setInt("ipc.client.connect.max.retries", 1);
+    conf.setInt(IPC_CLIENT_CONNECT_MAX_RETRIES_KEY, 1);
   }
   
   /*

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestBlockTokenWithDFS.java

@@ -17,6 +17,7 @@
  */
 package org.apache.hadoop.hdfs.server.blockmanagement;
 
+import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.IPC_CLIENT_CONNECT_MAX_RETRIES_KEY;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
@@ -215,7 +216,7 @@ public class TestBlockTokenWithDFS {
     conf.setInt("io.bytes.per.checksum", BLOCK_SIZE);
     conf.setInt(DFSConfigKeys.DFS_HEARTBEAT_INTERVAL_KEY, 1);
     conf.setInt(DFSConfigKeys.DFS_REPLICATION_KEY, numDataNodes);
-    conf.setInt("ipc.client.connect.max.retries", 0);
+    conf.setInt(IPC_CLIENT_CONNECT_MAX_RETRIES_KEY, 0);
     // Set short retry timeouts so this test runs faster
     conf.setInt(HdfsClientConfigKeys.Retry.WINDOW_BASE_KEY, 10);
     return conf;