HDFS-8052. Move WebHdfsFileSystem into hadoop-hdfs-client. Contributed by Haohui Mai.

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/retry/RetryUtils.java

@@ -60,7 +60,7 @@ public class RetryUtils {
       boolean defaultRetryPolicyEnabled,
       String retryPolicySpecKey,
       String defaultRetryPolicySpec,
-      final Class<? extends Exception> remoteExceptionToRetry
+      final String remoteExceptionToRetry
       ) {
     
     final RetryPolicy multipleLinearRandomRetry = 
@@ -94,7 +94,7 @@ public class RetryUtils {
           final RetryPolicy p;
           if (e instanceof RemoteException) {
             final RemoteException re = (RemoteException)e;
-            p = remoteExceptionToRetry.getName().equals(re.getClassName())?
+            p = remoteExceptionToRetry.equals(re.getClassName())?
                 multipleLinearRandomRetry: RetryPolicies.TRY_ONCE_THEN_FAIL;
           } else if (e instanceof IOException || e instanceof ServiceException) {
             p = multipleLinearRandomRetry;

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

@@ -19,10 +19,17 @@ package org.apache.hadoop.hdfs;
 
 import com.google.common.base.Joiner;
 import com.google.common.collect.Maps;
+import org.apache.commons.io.Charsets;
 import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.BlockLocation;
+import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.hdfs.client.HdfsClientConfigKeys;
+import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
+import org.apache.hadoop.hdfs.protocol.LocatedBlock;
+import org.apache.hadoop.hdfs.protocol.LocatedBlocks;
 import org.apache.hadoop.hdfs.web.WebHdfsConstants;
 import org.apache.hadoop.net.NetUtils;
+import org.apache.hadoop.net.NodeBase;
 import org.apache.hadoop.util.StringUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -31,6 +38,7 @@ import java.io.UnsupportedEncodingException;
 import java.net.InetSocketAddress;
 import java.util.Collection;
 import java.util.Collections;
+import java.util.List;
 import java.util.Map;
 
 import static org.apache.hadoop.hdfs.client.HdfsClientConfigKeys.DFS_HA_NAMENODES_KEY_PREFIX;
@@ -39,6 +47,13 @@ import static org.apache.hadoop.hdfs.client.HdfsClientConfigKeys.DFS_NAMESERVICE
 public class DFSUtilClient {
   private static final Logger LOG = LoggerFactory.getLogger(
       DFSUtilClient.class);
+  /**
+   * Converts a string to a byte array using UTF8 encoding.
+   */
+  public static byte[] string2Bytes(String str) {
+    return str.getBytes(Charsets.UTF_8);
+  }
+
   /**
    * Converts a byte array to a string using UTF8 encoding.
    */
@@ -113,6 +128,62 @@ public class DFSUtilClient {
     }
   }
 
+  /**
+   * Convert a LocatedBlocks to BlockLocations[]
+   * @param blocks a LocatedBlocks
+   * @return an array of BlockLocations
+   */
+  public static BlockLocation[] locatedBlocks2Locations(LocatedBlocks blocks) {
+    if (blocks == null) {
+      return new BlockLocation[0];
+    }
+    return locatedBlocks2Locations(blocks.getLocatedBlocks());
+  }
+
+  /**
+   * Convert a List<LocatedBlock> to BlockLocation[]
+   * @param blocks A List<LocatedBlock> to be converted
+   * @return converted array of BlockLocation
+   */
+  public static BlockLocation[] locatedBlocks2Locations(
+      List<LocatedBlock> blocks) {
+    if (blocks == null) {
+      return new BlockLocation[0];
+    }
+    int nrBlocks = blocks.size();
+    BlockLocation[] blkLocations = new BlockLocation[nrBlocks];
+    if (nrBlocks == 0) {
+      return blkLocations;
+    }
+    int idx = 0;
+    for (LocatedBlock blk : blocks) {
+      assert idx < nrBlocks : "Incorrect index";
+      DatanodeInfo[] locations = blk.getLocations();
+      String[] hosts = new String[locations.length];
+      String[] xferAddrs = new String[locations.length];
+      String[] racks = new String[locations.length];
+      for (int hCnt = 0; hCnt < locations.length; hCnt++) {
+        hosts[hCnt] = locations[hCnt].getHostName();
+        xferAddrs[hCnt] = locations[hCnt].getXferAddr();
+        NodeBase node = new NodeBase(xferAddrs[hCnt],
+                                     locations[hCnt].getNetworkLocation());
+        racks[hCnt] = node.toString();
+      }
+      DatanodeInfo[] cachedLocations = blk.getCachedLocations();
+      String[] cachedHosts = new String[cachedLocations.length];
+      for (int i=0; i<cachedLocations.length; i++) {
+        cachedHosts[i] = cachedLocations[i].getHostName();
+      }
+      blkLocations[idx] = new BlockLocation(xferAddrs, hosts, cachedHosts,
+                                            racks,
+                                            blk.getStartOffset(),
+                                            blk.getBlockSize(),
+                                            blk.isCorrupt());
+      idx++;
+    }
+    return blkLocations;
+  }
+
   /**
    * Decode a specific range of bytes of the given byte array to a string
    * using UTF8.
@@ -234,4 +305,42 @@ public class DFSUtilClient {
     }
     return value;
   }
+
+  /**
+   * Whether the pathname is valid.  Currently prohibits relative paths,
+   * names which contain a ":" or "//", or other non-canonical paths.
+   */
+  public static boolean isValidName(String src) {
+    // Path must be absolute.
+    if (!src.startsWith(Path.SEPARATOR)) {
+      return false;
+    }
+
+    // Check for ".." "." ":" "/"
+    String[] components = StringUtils.split(src, '/');
+    for (int i = 0; i < components.length; i++) {
+      String element = components[i];
+      if (element.equals(".")  ||
+          (element.contains(":"))  ||
+          (element.contains("/"))) {
+        return false;
+      }
+      // ".." is allowed in path starting with /.reserved/.inodes
+      if (element.equals("..")) {
+        if (components.length > 4
+            && components[1].equals(".reserved")
+            && components[2].equals(".inodes")) {
+          continue;
+        }
+        return false;
+      }
+      // The string may start or end with a /, but not have
+      // "//" in the middle.
+      if (element.isEmpty() && i != components.length - 1 &&
+          i != 0) {
+        return false;
+      }
+    }
+    return true;
+  }
 }

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

@@ -26,6 +26,7 @@ public interface HdfsClientConfigKeys {
   long    DFS_BLOCK_SIZE_DEFAULT = 128*1024*1024;
   String  DFS_REPLICATION_KEY = "dfs.replication";
   short   DFS_REPLICATION_DEFAULT = 3;
+  String  DFS_WEBHDFS_USER_PATTERN_KEY = "dfs.webhdfs.user.provider.user.pattern";
   String  DFS_WEBHDFS_USER_PATTERN_DEFAULT = "^[A-Za-z_][A-Za-z0-9._-]*[$]?$";
   String DFS_WEBHDFS_ACL_PERMISSION_PATTERN_DEFAULT =
       "^(default:)?(user|group|mask|other):[[A-Za-z_][A-Za-z0-9._-]]*:([rwx-]{3})?(,(default:)?(user|group|mask|other):[[A-Za-z_][A-Za-z0-9._-]]*:([rwx-]{3})?)*$";

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

@@ -38,4 +38,8 @@ public interface HdfsConstantsClient {
    * URI.
    */
   String HA_DT_SERVICE_PREFIX = "ha-";
+  // The name of the SafeModeException. FileSystem should retry if it sees
+  // the below exception in RPC
+  String SAFEMODE_EXCEPTION_CLASS_NAME = "org.apache.hadoop.hdfs.server" +
+      ".namenode.SafeModeException";
 }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/web/JsonUtilClient.java → hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/JsonUtilClient.java

@@ -29,7 +29,7 @@ import org.apache.hadoop.fs.XAttrCodec;
 import org.apache.hadoop.fs.permission.AclEntry;
 import org.apache.hadoop.fs.permission.AclStatus;
 import org.apache.hadoop.fs.permission.FsPermission;
-import org.apache.hadoop.hdfs.DFSUtil;
+import org.apache.hadoop.hdfs.DFSUtilClient;
 import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
 import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
 import org.apache.hadoop.hdfs.protocol.FsPermissionExtension;
@@ -110,7 +110,7 @@ class JsonUtilClient {
     final String localName = (String) m.get("pathSuffix");
     final WebHdfsConstants.PathType type = WebHdfsConstants.PathType.valueOf((String) m.get("type"));
     final byte[] symlink = type != WebHdfsConstants.PathType.SYMLINK? null
-        : DFSUtil.string2Bytes((String) m.get("symlink"));
+        : DFSUtilClient.string2Bytes((String) m.get("symlink"));
 
     final long len = ((Number) m.get("length")).longValue();
     final String owner = (String) m.get("owner");
@@ -130,7 +130,8 @@ class JsonUtilClient {
         HdfsConstantsClient.BLOCK_STORAGE_POLICY_ID_UNSPECIFIED;
     return new HdfsFileStatus(len, type == WebHdfsConstants.PathType.DIRECTORY, replication,
         blockSize, mTime, aTime, permission, owner, group,
-        symlink, DFSUtil.string2Bytes(localName), fileId, childrenNum, null,
+        symlink, DFSUtilClient.string2Bytes(localName),
+        fileId, childrenNum, null,
         storagePolicy);
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/web/SWebHdfsFileSystem.java → hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/SWebHdfsFileSystem.java

@@ -17,7 +17,7 @@
  */
 package org.apache.hadoop.hdfs.web;
 
-import org.apache.hadoop.hdfs.DFSConfigKeys;
+import org.apache.hadoop.hdfs.client.HdfsClientConfigKeys;
 import org.apache.hadoop.io.Text;
 
 public class SWebHdfsFileSystem extends WebHdfsFileSystem {
@@ -39,6 +39,6 @@ public class SWebHdfsFileSystem extends WebHdfsFileSystem {
 
   @Override
   protected int getDefaultPort() {
-    return DFSConfigKeys.DFS_NAMENODE_HTTPS_PORT_DEFAULT;
+    return HdfsClientConfigKeys.DFS_NAMENODE_HTTPS_PORT_DEFAULT;
   }
 }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/web/URLConnectionFactory.java → hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/URLConnectionFactory.java

@@ -174,7 +174,7 @@ public class URLConnectionFactory {
 
   /**
    * Sets timeout parameters on the given URLConnection.
-   * 
+   *
    * @param connection
    *          URLConnection to set
    * @param socketTimeout

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/web/WebHdfsFileSystem.java → hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/WebHdfsFileSystem.java

@@ -56,14 +56,12 @@ import org.apache.hadoop.fs.permission.AclEntry;
 import org.apache.hadoop.fs.permission.AclStatus;
 import org.apache.hadoop.fs.permission.FsAction;
 import org.apache.hadoop.fs.permission.FsPermission;
-import org.apache.hadoop.hdfs.DFSConfigKeys;
-import org.apache.hadoop.hdfs.DFSUtil;
 import org.apache.hadoop.hdfs.DFSUtilClient;
 import org.apache.hadoop.hdfs.HAUtilClient;
 import org.apache.hadoop.hdfs.client.HdfsClientConfigKeys;
+import org.apache.hadoop.hdfs.protocol.HdfsConstantsClient;
 import org.apache.hadoop.hdfs.protocol.HdfsFileStatus;
 import org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenIdentifier;
-import org.apache.hadoop.hdfs.server.namenode.SafeModeException;
 import org.apache.hadoop.hdfs.web.resources.*;
 import org.apache.hadoop.hdfs.web.resources.HttpOpParam.Op;
 import org.apache.hadoop.io.Text;
@@ -145,8 +143,8 @@ public class WebHdfsFileSystem extends FileSystem
     setConf(conf);
     /** set user pattern based on configuration file */
     UserParam.setUserPattern(conf.get(
-        DFSConfigKeys.DFS_WEBHDFS_USER_PATTERN_KEY,
-        DFSConfigKeys.DFS_WEBHDFS_USER_PATTERN_DEFAULT));
+        HdfsClientConfigKeys.DFS_WEBHDFS_USER_PATTERN_KEY,
+        HdfsClientConfigKeys.DFS_WEBHDFS_USER_PATTERN_DEFAULT));
 
     connectionFactory = URLConnectionFactory
         .newDefaultURLConnectionFactory(conf);
@@ -173,7 +171,7 @@ public class WebHdfsFileSystem extends FileSystem
               HdfsClientConfigKeys.HttpClient.RETRY_POLICY_ENABLED_DEFAULT,
               HdfsClientConfigKeys.HttpClient.RETRY_POLICY_SPEC_KEY,
               HdfsClientConfigKeys.HttpClient.RETRY_POLICY_SPEC_DEFAULT,
-              SafeModeException.class);
+              HdfsConstantsClient.SAFEMODE_EXCEPTION_CLASS_NAME);
     } else {
 
       int maxFailoverAttempts = conf.getInt(
@@ -224,7 +222,7 @@ public class WebHdfsFileSystem extends FileSystem
         if(LOG.isDebugEnabled()) {
           LOG.debug("Using UGI token: " + token);
         }
-        canRefreshDelegationToken = false; 
+        canRefreshDelegationToken = false;
       } else {
         token = getDelegationToken(null);
         if (token != null) {
@@ -256,14 +254,14 @@ public class WebHdfsFileSystem extends FileSystem
 
   @Override
   protected int getDefaultPort() {
-    return DFSConfigKeys.DFS_NAMENODE_HTTP_PORT_DEFAULT;
+    return HdfsClientConfigKeys.DFS_NAMENODE_HTTP_PORT_DEFAULT;
   }
 
   @Override
   public URI getUri() {
     return this.uri;
   }
-  
+
   @Override
   protected URI canonicalizeUri(URI uri) {
     return NetUtils.getCanonicalUri(uri, getDefaultPort());
@@ -287,8 +285,8 @@ public class WebHdfsFileSystem extends FileSystem
   @Override
   public synchronized void setWorkingDirectory(final Path dir) {
     String result = makeAbsolute(dir).toUri().getPath();
-    if (!DFSUtil.isValidName(result)) {
-      throw new IllegalArgumentException("Invalid DFS directory name " + 
+    if (!DFSUtilClient.isValidName(result)) {
+      throw new IllegalArgumentException("Invalid DFS directory name " +
                                          result);
     }
     workingDir = makeAbsolute(dir);
@@ -367,10 +365,10 @@ public class WebHdfsFileSystem extends FileSystem
 
   /**
    * Covert an exception to an IOException.
-   * 
+   *
    * For a non-IOException, wrap it with IOException.
    * For a RemoteException, unwrap it.
-   * For an IOException which is not a RemoteException, return it. 
+   * For an IOException which is not a RemoteException, return it.
    */
   private static IOException toIOException(Exception e) {
     if (!(e instanceof IOException)) {
@@ -413,9 +411,9 @@ public class WebHdfsFileSystem extends FileSystem
     }
     return url;
   }
-  
+
   Param<?,?>[] getAuthParameters(final HttpOpParam.Op op) throws IOException {
-    List<Param<?,?>> authParams = Lists.newArrayList();    
+    List<Param<?,?>> authParams = Lists.newArrayList();
     // Skip adding delegation token for token operations because these
     // operations require authentication.
     Token<?> token = null;
@@ -494,11 +492,11 @@ public class WebHdfsFileSystem extends FileSystem
 
     /**
      * Two-step requests redirected to a DN
-     * 
+     *
      * Create/Append:
-     * Step 1) Submit a Http request with neither auto-redirect nor data. 
+     * Step 1) Submit a Http request with neither auto-redirect nor data.
      * Step 2) Submit another Http request with the URL from the Location header with data.
-     * 
+     *
      * The reason of having two-step create/append is for preventing clients to
      * send out the data before the redirect. This issue is addressed by the
      * "Expect: 100-continue" header in HTTP/1.1; see RFC 2616, Section 8.2.3.
@@ -506,7 +504,7 @@ public class WebHdfsFileSystem extends FileSystem
      * and Java 6 http client), which do not correctly implement "Expect:
      * 100-continue". The two-step create/append is a temporary workaround for
      * the software library bugs.
-     * 
+     *
      * Open/Checksum
      * Also implements two-step connects for other operations redirected to
      * a DN such as open and checksum
@@ -515,7 +513,7 @@ public class WebHdfsFileSystem extends FileSystem
       //redirect hostname and port
       String redirectHost = null;
 
-      
+
       // resolve redirects for a DN operation unless already resolved
       if (op.getRedirect() && !redirected) {
         final HttpOpParam.Op redirectOp =
@@ -545,7 +543,7 @@ public class WebHdfsFileSystem extends FileSystem
           }
         }
         throw ioe;
-      }      
+      }
     }
 
     private HttpURLConnection connect(final HttpOpParam.Op op, final URL url)
@@ -557,7 +555,7 @@ public class WebHdfsFileSystem extends FileSystem
       conn.setInstanceFollowRedirects(false);
       switch (op.getType()) {
         // if not sending a message body for a POST or PUT operation, need
-        // to ensure the server/proxy knows this 
+        // to ensure the server/proxy knows this
         case POST:
         case PUT: {
           conn.setDoOutput(true);
@@ -665,21 +663,21 @@ public class WebHdfsFileSystem extends FileSystem
   abstract class AbstractFsPathRunner<T> extends AbstractRunner<T> {
     private final Path fspath;
     private final Param<?,?>[] parameters;
-    
+
     AbstractFsPathRunner(final HttpOpParam.Op op, final Path fspath,
         Param<?,?>... parameters) {
       super(op, false);
       this.fspath = fspath;
       this.parameters = parameters;
     }
-    
+
     AbstractFsPathRunner(final HttpOpParam.Op op, Param<?,?>[] parameters,
         final Path fspath) {
       super(op, false);
       this.fspath = fspath;
       this.parameters = parameters;
     }
-    
+
     @Override
     protected URL getUrl() throws IOException {
       if (excludeDatanodes.getValue() != null) {
@@ -700,7 +698,7 @@ public class WebHdfsFileSystem extends FileSystem
     FsPathRunner(Op op, Path fspath, Param<?,?>... parameters) {
       super(op, fspath, parameters);
     }
-    
+
     @Override
     Void getResponse(HttpURLConnection conn) throws IOException {
       return null;
@@ -715,12 +713,12 @@ public class WebHdfsFileSystem extends FileSystem
         Param<?,?>... parameters) {
       super(op, fspath, parameters);
     }
-    
+
     FsPathResponseRunner(final HttpOpParam.Op op, Param<?,?>[] parameters,
         final Path fspath) {
       super(op, parameters, fspath);
     }
-    
+
     @Override
     final T getResponse(HttpURLConnection conn) throws IOException {
       try {
@@ -743,7 +741,7 @@ public class WebHdfsFileSystem extends FileSystem
         conn.disconnect();
       }
     }
-    
+
     abstract T decodeResponse(Map<?,?> json) throws IOException;
   }
 
@@ -754,7 +752,7 @@ public class WebHdfsFileSystem extends FileSystem
     FsPathBooleanRunner(Op op, Path fspath, Param<?,?>... parameters) {
       super(op, fspath, parameters);
     }
-    
+
     @Override
     Boolean decodeResponse(Map<?,?> json) throws IOException {
       return (Boolean)json.get("boolean");
@@ -766,13 +764,13 @@ public class WebHdfsFileSystem extends FileSystem
    */
   class FsPathOutputStreamRunner extends AbstractFsPathRunner<FSDataOutputStream> {
     private final int bufferSize;
-    
+
     FsPathOutputStreamRunner(Op op, Path fspath, int bufferSize,
         Param<?,?>... parameters) {
       super(op, fspath, parameters);
       this.bufferSize = bufferSize;
     }
-    
+
     @Override
     FSDataOutputStream getResponse(final HttpURLConnection conn)
         throws IOException {
@@ -804,7 +802,7 @@ public class WebHdfsFileSystem extends FileSystem
       return conn;
     }
   }
-  
+
   /**
    * Used by open() which tracks the resolved url itself
    */
@@ -918,26 +916,26 @@ public class WebHdfsFileSystem extends FileSystem
         new RenameOptionSetParam(options)
     ).run();
   }
-  
+
   @Override
-  public void setXAttr(Path p, String name, byte[] value, 
+  public void setXAttr(Path p, String name, byte[] value,
       EnumSet<XAttrSetFlag> flag) throws IOException {
     statistics.incrementWriteOps(1);
     final HttpOpParam.Op op = PutOpParam.Op.SETXATTR;
     if (value != null) {
       new FsPathRunner(op, p, new XAttrNameParam(name), new XAttrValueParam(
-          XAttrCodec.encodeValue(value, XAttrCodec.HEX)), 
+          XAttrCodec.encodeValue(value, XAttrCodec.HEX)),
           new XAttrSetFlagParam(flag)).run();
     } else {
-      new FsPathRunner(op, p, new XAttrNameParam(name), 
+      new FsPathRunner(op, p, new XAttrNameParam(name),
           new XAttrSetFlagParam(flag)).run();
     }
   }
-  
+
   @Override
   public byte[] getXAttr(Path p, final String name) throws IOException {
     final HttpOpParam.Op op = GetOpParam.Op.GETXATTRS;
-    return new FsPathResponseRunner<byte[]>(op, p, new XAttrNameParam(name), 
+    return new FsPathResponseRunner<byte[]>(op, p, new XAttrNameParam(name),
         new XAttrEncodingParam(XAttrCodec.HEX)) {
       @Override
       byte[] decodeResponse(Map<?, ?> json) throws IOException {
@@ -945,11 +943,11 @@ public class WebHdfsFileSystem extends FileSystem
       }
     }.run();
   }
-  
+
   @Override
   public Map<String, byte[]> getXAttrs(Path p) throws IOException {
     final HttpOpParam.Op op = GetOpParam.Op.GETXATTRS;
-    return new FsPathResponseRunner<Map<String, byte[]>>(op, p, 
+    return new FsPathResponseRunner<Map<String, byte[]>>(op, p,
         new XAttrEncodingParam(XAttrCodec.HEX)) {
       @Override
       Map<String, byte[]> decodeResponse(Map<?, ?> json) throws IOException {
@@ -957,18 +955,18 @@ public class WebHdfsFileSystem extends FileSystem
       }
     }.run();
   }
-  
+
   @Override
-  public Map<String, byte[]> getXAttrs(Path p, final List<String> names) 
+  public Map<String, byte[]> getXAttrs(Path p, final List<String> names)
       throws IOException {
-    Preconditions.checkArgument(names != null && !names.isEmpty(), 
+    Preconditions.checkArgument(names != null && !names.isEmpty(),
         "XAttr names cannot be null or empty.");
     Param<?,?>[] parameters = new Param<?,?>[names.size() + 1];
     for (int i = 0; i < parameters.length - 1; i++) {
       parameters[i] = new XAttrNameParam(names.get(i));
     }
     parameters[parameters.length - 1] = new XAttrEncodingParam(XAttrCodec.HEX);
-    
+
     final HttpOpParam.Op op = GetOpParam.Op.GETXATTRS;
     return new FsPathResponseRunner<Map<String, byte[]>>(op, parameters, p) {
       @Override
@@ -977,7 +975,7 @@ public class WebHdfsFileSystem extends FileSystem
       }
     }.run();
   }
-  
+
   @Override
   public List<String> listXAttrs(Path p) throws IOException {
     final HttpOpParam.Op op = GetOpParam.Op.LISTXATTRS;
@@ -1057,7 +1055,7 @@ public class WebHdfsFileSystem extends FileSystem
   }
 
   @Override
-  public Path createSnapshot(final Path path, final String snapshotName) 
+  public Path createSnapshot(final Path path, final String snapshotName)
       throws IOException {
     statistics.incrementWriteOps(1);
     final HttpOpParam.Op op = PutOpParam.Op.CREATESNAPSHOT;
@@ -1111,14 +1109,14 @@ public class WebHdfsFileSystem extends FileSystem
 
   @Override
   public long getDefaultBlockSize() {
-    return getConf().getLongBytes(DFSConfigKeys.DFS_BLOCK_SIZE_KEY,
-        DFSConfigKeys.DFS_BLOCK_SIZE_DEFAULT);
+    return getConf().getLongBytes(HdfsClientConfigKeys.DFS_BLOCK_SIZE_KEY,
+        HdfsClientConfigKeys.DFS_BLOCK_SIZE_DEFAULT);
   }
 
   @Override
   public short getDefaultReplication() {
-    return (short)getConf().getInt(DFSConfigKeys.DFS_REPLICATION_KEY,
-        DFSConfigKeys.DFS_REPLICATION_DEFAULT);
+    return (short)getConf().getInt(HdfsClientConfigKeys.DFS_REPLICATION_KEY,
+        HdfsClientConfigKeys.DFS_REPLICATION_DEFAULT);
   }
 
   @Override
@@ -1228,7 +1226,7 @@ public class WebHdfsFileSystem extends FileSystem
       final URL offsetUrl = offset == 0L? url
           : new URL(url + "&" + new OffsetParam(offset));
       return new URLRunner(GetOpParam.Op.OPEN, offsetUrl, resolved).run();
-    }  
+    }
   }
 
   private static final String OFFSET_PARAM_PREFIX = OffsetParam.NAME + "=";
@@ -1359,7 +1357,7 @@ public class WebHdfsFileSystem extends FileSystem
         new TokenArgumentParam(token.encodeToUrlString())
     ).run();
   }
-  
+
   @Override
   public BlockLocation[] getFileBlockLocations(final FileStatus status,
       final long offset, final long length) throws IOException {
@@ -1370,7 +1368,7 @@ public class WebHdfsFileSystem extends FileSystem
   }
 
   @Override
-  public BlockLocation[] getFileBlockLocations(final Path p, 
+  public BlockLocation[] getFileBlockLocations(final Path p,
       final long offset, final long length) throws IOException {
     statistics.incrementReadOps(1);
 
@@ -1379,7 +1377,7 @@ public class WebHdfsFileSystem extends FileSystem
         new OffsetParam(offset), new LengthParam(length)) {
       @Override
       BlockLocation[] decodeResponse(Map<?,?> json) throws IOException {
-        return DFSUtil.locatedBlocks2Locations(
+        return DFSUtilClient.locatedBlocks2Locations(
             JsonUtilClient.toLocatedBlocks(json));
       }
     }.run();
@@ -1408,7 +1406,7 @@ public class WebHdfsFileSystem extends FileSystem
   public MD5MD5CRC32FileChecksum getFileChecksum(final Path p
       ) throws IOException {
     statistics.incrementReadOps(1);
-  
+
     final HttpOpParam.Op op = GetOpParam.Op.GETFILECHECKSUM;
     return new FsPathResponseRunner<MD5MD5CRC32FileChecksum>(op, p) {
       @Override

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

@@ -467,6 +467,8 @@ Release 2.8.0 - UNRELEASED
     HDFS-8215. Refactor NamenodeFsck#check method.  (Takanobu Asanuma
     via szetszwo)
 
+    HDFS-8052. Move WebHdfsFileSystem into hadoop-hdfs-client. (wheat9)
+
   OPTIMIZATIONS
 
     HDFS-8026. Trace FSOutputSummer#writeChecksumChunks rather than

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

@@ -48,7 +48,6 @@ import org.apache.hadoop.hdfs.security.token.block.BlockTokenIdentifier;
 import org.apache.hadoop.hdfs.security.token.block.InvalidBlockTokenException;
 import org.apache.hadoop.ipc.RPC;
 import org.apache.hadoop.security.token.Token;
-import org.apache.htrace.Sampler;
 import org.apache.htrace.Span;
 import org.apache.htrace.Trace;
 import org.apache.htrace.TraceScope;
@@ -296,7 +295,7 @@ class BlockStorageLocationUtil {
       List<LocatedBlock> blocks, 
       Map<LocatedBlock, List<VolumeId>> blockVolumeIds) throws IOException {
     // Construct the final return value of VolumeBlockLocation[]
-    BlockLocation[] locations = DFSUtil.locatedBlocks2Locations(blocks);
+    BlockLocation[] locations = DFSUtilClient.locatedBlocks2Locations(blocks);
     List<BlockStorageLocation> volumeBlockLocs = 
         new ArrayList<BlockStorageLocation>(locations.length);
     for (int i = 0; i < locations.length; i++) {

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

@@ -917,7 +917,7 @@ public class DFSClient implements java.io.Closeable, RemotePeerFactory,
     TraceScope scope = getPathTraceScope("getBlockLocations", src);
     try {
       LocatedBlocks blocks = getLocatedBlocks(src, start, length);
-      BlockLocation[] locations =  DFSUtil.locatedBlocks2Locations(blocks);
+      BlockLocation[] locations =  DFSUtilClient.locatedBlocks2Locations(blocks);
       HdfsBlockLocation[] hdfsLocations = new HdfsBlockLocation[locations.length];
       for (int i = 0; i < locations.length; i++) {
         hdfsLocations[i] = new HdfsBlockLocation(locations[i], blocks.get(i));

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

@@ -164,7 +164,10 @@ public class DFSConfigKeys extends CommonConfigurationKeys {
    */
   public static final String  DFS_WEBHDFS_AUTHENTICATION_FILTER_DEFAULT =
       "org.apache.hadoop.hdfs.web.AuthFilter".toString();
-  public static final String  DFS_WEBHDFS_USER_PATTERN_KEY = "dfs.webhdfs.user.provider.user.pattern";
+  @Deprecated
+  public static final String  DFS_WEBHDFS_USER_PATTERN_KEY =
+      HdfsClientConfigKeys.DFS_WEBHDFS_USER_PATTERN_KEY;
+  @Deprecated
   public static final String  DFS_WEBHDFS_USER_PATTERN_DEFAULT =
       HdfsClientConfigKeys.DFS_WEBHDFS_USER_PATTERN_DEFAULT;
   public static final String  DFS_PERMISSIONS_ENABLED_KEY = "dfs.permissions.enabled";

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

@@ -228,37 +228,7 @@ public class DFSUtil {
    * names which contain a ":" or "//", or other non-canonical paths.
    */
   public static boolean isValidName(String src) {
-    // Path must be absolute.
-    if (!src.startsWith(Path.SEPARATOR)) {
-      return false;
-    }
-      
-    // Check for ".." "." ":" "/"
-    String[] components = StringUtils.split(src, '/');
-    for (int i = 0; i < components.length; i++) {
-      String element = components[i];
-      if (element.equals(".")  ||
-          (element.indexOf(":") >= 0)  ||
-          (element.indexOf("/") >= 0)) {
-        return false;
-      }
-      // ".." is allowed in path starting with /.reserved/.inodes
-      if (element.equals("..")) {
-        if (components.length > 4
-            && components[1].equals(FSDirectory.DOT_RESERVED_STRING)
-            && components[2].equals(FSDirectory.DOT_INODES_STRING)) {
-          continue;
-        }
-        return false;
-      }
-      // The string may start or end with a /, but not have
-      // "//" in the middle.
-      if (element.isEmpty() && i != components.length - 1 &&
-          i != 0) {
-        return false;
-      }
-    }
-    return true;
+    return DFSUtilClient.isValidName(src);
   }
 
   /**
@@ -329,7 +299,7 @@ public class DFSUtil {
    * Converts a string to a byte array using UTF8 encoding.
    */
   public static byte[] string2Bytes(String str) {
-    return str.getBytes(Charsets.UTF_8);
+    return DFSUtilClient.string2Bytes(str);
   }
 
   /**
@@ -475,61 +445,6 @@ public class DFSUtil {
     }
     return result;
   }
-  
-  /**
-   * Convert a LocatedBlocks to BlockLocations[]
-   * @param blocks a LocatedBlocks
-   * @return an array of BlockLocations
-   */
-  public static BlockLocation[] locatedBlocks2Locations(LocatedBlocks blocks) {
-    if (blocks == null) {
-      return new BlockLocation[0];
-    }
-    return locatedBlocks2Locations(blocks.getLocatedBlocks());
-  }
-  
-  /**
-   * Convert a List<LocatedBlock> to BlockLocation[]
-   * @param blocks A List<LocatedBlock> to be converted
-   * @return converted array of BlockLocation
-   */
-  public static BlockLocation[] locatedBlocks2Locations(List<LocatedBlock> blocks) {
-    if (blocks == null) {
-      return new BlockLocation[0];
-    }
-    int nrBlocks = blocks.size();
-    BlockLocation[] blkLocations = new BlockLocation[nrBlocks];
-    if (nrBlocks == 0) {
-      return blkLocations;
-    }
-    int idx = 0;
-    for (LocatedBlock blk : blocks) {
-      assert idx < nrBlocks : "Incorrect index";
-      DatanodeInfo[] locations = blk.getLocations();
-      String[] hosts = new String[locations.length];
-      String[] xferAddrs = new String[locations.length];
-      String[] racks = new String[locations.length];
-      for (int hCnt = 0; hCnt < locations.length; hCnt++) {
-        hosts[hCnt] = locations[hCnt].getHostName();
-        xferAddrs[hCnt] = locations[hCnt].getXferAddr();
-        NodeBase node = new NodeBase(xferAddrs[hCnt],
-                                     locations[hCnt].getNetworkLocation());
-        racks[hCnt] = node.toString();
-      }
-      DatanodeInfo[] cachedLocations = blk.getCachedLocations();
-      String[] cachedHosts = new String[cachedLocations.length];
-      for (int i=0; i<cachedLocations.length; i++) {
-        cachedHosts[i] = cachedLocations[i].getHostName();
-      }
-      blkLocations[idx] = new BlockLocation(xferAddrs, hosts, cachedHosts,
-                                            racks,
-                                            blk.getStartOffset(),
-                                            blk.getBlockSize(),
-                                            blk.isCorrupt());
-      idx++;
-    }
-    return blkLocations;
-  }
 
   /**
    * Return configuration key of format key.suffix1.suffix2...suffixN

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

@@ -404,7 +404,7 @@ public class NameNodeProxies {
             HdfsClientConfigKeys.Retry.POLICY_ENABLED_DEFAULT, 
             HdfsClientConfigKeys.Retry.POLICY_SPEC_KEY,
             HdfsClientConfigKeys.Retry.POLICY_SPEC_DEFAULT,
-            SafeModeException.class);
+            SafeModeException.class.getName());
     
     final long version = RPC.getProtocolVersion(ClientNamenodeProtocolPB.class);
     ClientNamenodeProtocolPB proxy = RPC.getProtocolProxy(

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/HdfsLocatedFileStatus.java

@@ -25,7 +25,7 @@ import org.apache.hadoop.fs.FileEncryptionInfo;
 import org.apache.hadoop.fs.LocatedFileStatus;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.permission.FsPermission;
-import org.apache.hadoop.hdfs.DFSUtil;
+import org.apache.hadoop.hdfs.DFSUtilClient;
 
 /** 
  * Interface that represents the over the wire information
@@ -78,6 +78,6 @@ public class HdfsLocatedFileStatus extends HdfsFileStatus {
         isSymlink() ? new Path(getSymlink()) : null,
         (getFullPath(path)).makeQualified(
             defaultUri, null), // fully-qualify path
-        DFSUtil.locatedBlocks2Locations(getBlockLocations()));
+        DFSUtilClient.locatedBlocks2Locations(getBlockLocations()));
   }
 }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NameNodeHttpServer.java

@@ -29,6 +29,7 @@ import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.DFSUtil;
+import org.apache.hadoop.hdfs.client.HdfsClientConfigKeys;
 import org.apache.hadoop.hdfs.server.common.JspHelper;
 import org.apache.hadoop.hdfs.server.namenode.startupprogress.StartupProgress;
 import org.apache.hadoop.hdfs.server.namenode.web.resources.NamenodeWebHdfsMethods;
@@ -69,8 +70,8 @@ public class NameNodeHttpServer {
   private void initWebHdfs(Configuration conf) throws IOException {
     // set user pattern based on configuration file
     UserParam.setUserPattern(conf.get(
-        DFSConfigKeys.DFS_WEBHDFS_USER_PATTERN_KEY,
-        DFSConfigKeys.DFS_WEBHDFS_USER_PATTERN_DEFAULT));
+        HdfsClientConfigKeys.DFS_WEBHDFS_USER_PATTERN_KEY,
+        HdfsClientConfigKeys.DFS_WEBHDFS_USER_PATTERN_DEFAULT));
 
     // add authentication filter for webhdfs
     final String className = conf.get(

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

@@ -112,7 +112,7 @@ public class TestDFSUtil {
     List<LocatedBlock> ls = Arrays.asList(l1, l2);
     LocatedBlocks lbs = new LocatedBlocks(10, false, ls, l2, true, null);
 
-    BlockLocation[] bs = DFSUtil.locatedBlocks2Locations(lbs);
+    BlockLocation[] bs = DFSUtilClient.locatedBlocks2Locations(lbs);
 
     assertTrue("expected 2 blocks but got " + bs.length,
                bs.length == 2);
@@ -128,7 +128,7 @@ public class TestDFSUtil {
         corruptCount == 1);
 
     // test an empty location
-    bs = DFSUtil.locatedBlocks2Locations(new LocatedBlocks());
+    bs = DFSUtilClient.locatedBlocks2Locations(new LocatedBlocks());
     assertEquals(0, bs.length);
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/web/TestWebHDFS.java

@@ -45,6 +45,7 @@ import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.DistributedFileSystem;
 import org.apache.hadoop.hdfs.MiniDFSCluster;
 import org.apache.hadoop.hdfs.TestDFSClientRetries;
+import org.apache.hadoop.hdfs.client.HdfsClientConfigKeys;
 import org.apache.hadoop.hdfs.server.namenode.NameNode;
 import org.apache.hadoop.hdfs.server.namenode.snapshot.SnapshotTestHelper;
 import org.apache.hadoop.hdfs.server.namenode.web.resources.NamenodeWebHdfsMethods;
@@ -282,7 +283,8 @@ public class TestWebHDFS {
   @Test(timeout=300000)
   public void testNumericalUserName() throws Exception {
     final Configuration conf = WebHdfsTestUtil.createConf();
-    conf.set(DFSConfigKeys.DFS_WEBHDFS_USER_PATTERN_KEY, "^[A-Za-z0-9_][A-Za-z0-9._-]*[$]?$");
+    conf.set(HdfsClientConfigKeys.DFS_WEBHDFS_USER_PATTERN_KEY, "^[A-Za-z0-9_][A-Za-z0-9" +
+        "._-]*[$]?$");
     final MiniDFSCluster cluster =
         new MiniDFSCluster.Builder(conf).numDataNodes(1).build();
     try {