HDFS-8089. Move o.a.h.hdfs.web.resources.* to the client jars. Contributed by Haohui Mai.

hadoop-hdfs-project/hadoop-hdfs-client/pom.xml

@@ -29,6 +29,15 @@ http://maven.apache.org/xsd/maven-4.0.0.xsd">
   <description>Apache Hadoop HDFS Client</description>
   <name>Apache Hadoop HDFS Client</name>
   <packaging>jar</packaging>
+
+  <dependencies>
+    <dependency>
+      <groupId>org.apache.hadoop</groupId>
+      <artifactId>hadoop-common</artifactId>
+      <scope>provided</scope>
+    </dependency>
+  </dependencies>
+
   <build>
     <plugins>
       <plugin>

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

@@ -19,8 +19,15 @@ package org.apache.hadoop.hdfs.client;
 
 /** Client configuration properties */
 public interface HdfsClientConfigKeys {
-  static final String PREFIX = "dfs.client.";
+  String  DFS_BLOCK_SIZE_KEY = "dfs.blocksize";
+  long    DFS_BLOCK_SIZE_DEFAULT = 128*1024*1024;
+  String  DFS_REPLICATION_KEY = "dfs.replication";
+  short   DFS_REPLICATION_DEFAULT = 3;
+  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})?)*$";
 
+  static final String PREFIX = "dfs.client.";
   /** Client retry configuration properties */
   public interface Retry {
     static final String PREFIX = HdfsClientConfigKeys.PREFIX + "retry.";

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

@@ -17,7 +17,8 @@
  */
 package org.apache.hadoop.hdfs.web.resources;
 
-import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_WEBHDFS_ACL_PERMISSION_PATTERN_DEFAULT;
+import static org.apache.hadoop.hdfs.client.HdfsClientConfigKeys
+    .DFS_WEBHDFS_ACL_PERMISSION_PATTERN_DEFAULT;
 
 import java.util.List;
 import java.util.regex.Pattern;
@@ -37,7 +38,7 @@ public class AclPermissionParam extends StringParam {
 
   /**
    * Constructor.
-   * 
+   *
    * @param str a string representation of the parameter value.
    */
   public AclPermissionParam(final String str) {

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

@@ -17,8 +17,8 @@
  */
 package org.apache.hadoop.hdfs.web.resources;
 
-import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_BLOCK_SIZE_DEFAULT;
-import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_BLOCK_SIZE_KEY;
+import static org.apache.hadoop.hdfs.client.HdfsClientConfigKeys.DFS_BLOCK_SIZE_DEFAULT;
+import static org.apache.hadoop.hdfs.client.HdfsClientConfigKeys.DFS_BLOCK_SIZE_KEY;
 
 import org.apache.hadoop.conf.Configuration;
 

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

@@ -59,7 +59,7 @@ abstract class EnumSetParam<E extends Enum<E>> extends Param<EnumSet<E>, EnumSet
   public String getValueString() {
     return toString(value);
   }
-  
+
   /** The domain of the parameter. */
   static final class Domain<E extends Enum<E>> extends Param.Domain<EnumSet<E>> {
     private final Class<E> enumClass;

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

@@ -50,7 +50,7 @@ public class GetOpParam extends HttpOpParam<GetOpParam.Op> {
     Op(final boolean redirect, final int expectedHttpResponseCode) {
       this(redirect, expectedHttpResponseCode, false);
     }
-    
+
     Op(final boolean redirect, final int expectedHttpResponseCode,
        final boolean requireAuth) {
       this.redirect = redirect;
@@ -62,7 +62,7 @@ public class GetOpParam extends HttpOpParam<GetOpParam.Op> {
     public HttpOpParam.Type getType() {
       return HttpOpParam.Type.GET;
     }
-    
+
     @Override
     public boolean getRequireAuth() {
       return requireAuth;

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

@@ -45,7 +45,7 @@ public abstract class HttpOpParam<E extends Enum<E> & HttpOpParam.Op>
 
     /** @return true if the operation cannot use a token */
     public boolean getRequireAuth();
-    
+
     /** @return true if the operation will do output. */
     public boolean getDoOutput();
 
@@ -69,7 +69,7 @@ public abstract class HttpOpParam<E extends Enum<E> & HttpOpParam.Op>
         GetOpParam.Op.OPEN);
     static final TemporaryRedirectOp GETFILECHECKSUM = new TemporaryRedirectOp(
         GetOpParam.Op.GETFILECHECKSUM);
-    
+
     static final List<TemporaryRedirectOp> values
         = Collections.unmodifiableList(Arrays.asList(CREATE, APPEND, OPEN,
                                        GETFILECHECKSUM));

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

@@ -38,7 +38,7 @@ abstract class IntegerParam extends Param<Integer, IntegerParam.Domain> {
           + " = " + domain.toString(value) + " > " + domain.toString(max));
     }
   }
-  
+
   @Override
   public String toString() {
     return getName() + "=" + domain.toString(getValue());
@@ -80,7 +80,7 @@ abstract class IntegerParam extends Param<Integer, IntegerParam.Domain> {
       }
     }
 
-    /** Convert an Integer to a String. */ 
+    /** Convert an Integer to a String. */
     String toString(final Integer n) {
       return n == null? NULL: Integer.toString(n, radix);
     }

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

@@ -37,7 +37,7 @@ abstract class LongParam extends Param<Long, LongParam.Domain> {
           + " = " + domain.toString(value) + " > " + domain.toString(max));
     }
   }
-  
+
   @Override
   public String toString() {
     return getName() + "=" + domain.toString(getValue());
@@ -79,7 +79,7 @@ abstract class LongParam extends Param<Long, LongParam.Domain> {
       }
     }
 
-    /** Convert a Long to a String. */ 
+    /** Convert a Long to a String. */
     String toString(final Long n) {
       return n == null? NULL: Long.toString(n, radix);
     }

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

@@ -28,7 +28,7 @@ public class OldSnapshotNameParam extends StringParam {
   public static final String DEFAULT = "";
 
   private static final Domain DOMAIN = new Domain(NAME, null);
-  
+
   public OldSnapshotNameParam(final String str) {
     super(DOMAIN, str != null && !str.equals(DEFAULT) ? str : null);
   }

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

@@ -26,7 +26,7 @@ import java.util.Comparator;
 /** Base class of parameters. */
 public abstract class Param<T, D extends Param.Domain<T>> {
   static final String NULL = "null";
-  
+
   static final Comparator<Param<?,?>> NAME_CMP = new Comparator<Param<?,?>>() {
     @Override
     public int compare(Param<?, ?> left, Param<?, ?> right) {
@@ -90,11 +90,11 @@ public abstract class Param<T, D extends Param.Domain<T>> {
   static abstract class Domain<T> {
     /** Parameter name. */
     final String paramName;
-    
+
     Domain(final String paramName) {
       this.paramName = paramName;
     }
- 
+
     /** @return the parameter name. */
     public final String getParamName() {
       return paramName;

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

@@ -34,7 +34,7 @@ public class PermissionParam extends ShortParam {
   public static FsPermission getDefaultFsPermission() {
     return new FsPermission(DEFAULT_PERMISSION);
   }
-  
+
   /**
    * Constructor.
    * @param value the parameter value.

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

@@ -43,7 +43,7 @@ public class PostOpParam extends HttpOpParam<PostOpParam.Op> {
     public Type getType() {
       return Type.POST;
     }
-    
+
     @Override
     public boolean getRequireAuth() {
       return false;

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

@@ -33,22 +33,22 @@ public class PutOpParam extends HttpOpParam<PutOpParam.Op> {
     SETOWNER(false, HttpURLConnection.HTTP_OK),
     SETPERMISSION(false, HttpURLConnection.HTTP_OK),
     SETTIMES(false, HttpURLConnection.HTTP_OK),
-    
+
     RENEWDELEGATIONTOKEN(false, HttpURLConnection.HTTP_OK, true),
     CANCELDELEGATIONTOKEN(false, HttpURLConnection.HTTP_OK, true),
-    
+
     MODIFYACLENTRIES(false, HttpURLConnection.HTTP_OK),
     REMOVEACLENTRIES(false, HttpURLConnection.HTTP_OK),
     REMOVEDEFAULTACL(false, HttpURLConnection.HTTP_OK),
     REMOVEACL(false, HttpURLConnection.HTTP_OK),
     SETACL(false, HttpURLConnection.HTTP_OK),
-    
-    SETXATTR(false, HttpURLConnection.HTTP_OK), 
+
+    SETXATTR(false, HttpURLConnection.HTTP_OK),
     REMOVEXATTR(false, HttpURLConnection.HTTP_OK),
 
     CREATESNAPSHOT(false, HttpURLConnection.HTTP_OK),
     RENAMESNAPSHOT(false, HttpURLConnection.HTTP_OK),
-    
+
     NULL(false, HttpURLConnection.HTTP_NOT_IMPLEMENTED);
 
     final boolean doOutputAndRedirect;
@@ -58,7 +58,7 @@ public class PutOpParam extends HttpOpParam<PutOpParam.Op> {
     Op(final boolean doOutputAndRedirect, final int expectedHttpResponseCode) {
       this(doOutputAndRedirect, expectedHttpResponseCode, false);
     }
-    
+
     Op(final boolean doOutputAndRedirect, final int expectedHttpResponseCode,
        final boolean requireAuth) {
       this.doOutputAndRedirect = doOutputAndRedirect;
@@ -70,7 +70,7 @@ public class PutOpParam extends HttpOpParam<PutOpParam.Op> {
     public HttpOpParam.Type getType() {
       return HttpOpParam.Type.PUT;
     }
-    
+
     @Override
     public boolean getRequireAuth() {
       return requireAuth;

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

@@ -17,8 +17,8 @@
  */
 package org.apache.hadoop.hdfs.web.resources;
 
-import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_REPLICATION_DEFAULT;
-import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_REPLICATION_KEY;
+import static org.apache.hadoop.hdfs.client.HdfsClientConfigKeys.DFS_REPLICATION_DEFAULT;
+import static org.apache.hadoop.hdfs.client.HdfsClientConfigKeys.DFS_REPLICATION_KEY;
 
 import org.apache.hadoop.conf.Configuration;
 

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

@@ -38,7 +38,7 @@ abstract class ShortParam extends Param<Short, ShortParam.Domain> {
           + " = " + domain.toString(value) + " > " + domain.toString(max));
     }
   }
-  
+
   @Override
   public String toString() {
     return getName() + "=" + domain.toString(getValue());
@@ -80,7 +80,7 @@ abstract class ShortParam extends Param<Short, ShortParam.Domain> {
       }
     }
 
-    /** Convert a Short to a String. */ 
+    /** Convert a Short to a String. */
     String toString(final Short n) {
       return n == null? NULL: Integer.toString(n, radix);
     }

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

@@ -29,7 +29,7 @@ public class SnapshotNameParam extends StringParam {
   public static final String DEFAULT = "";
 
   private static final Domain DOMAIN = new Domain(NAME, null);
-  
+
   public SnapshotNameParam(final String str) {
     super(DOMAIN, str != null && !str.equals(DEFAULT) ? str : null);
   }

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

@@ -17,10 +17,10 @@
  */
 package org.apache.hadoop.hdfs.web.resources;
 
-import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_WEBHDFS_USER_PATTERN_DEFAULT;
+import static org.apache.hadoop.hdfs.client.HdfsClientConfigKeys.DFS_WEBHDFS_USER_PATTERN_DEFAULT;
 import org.apache.hadoop.security.UserGroupInformation;
 import com.google.common.annotations.VisibleForTesting;
- 
+
 import java.text.MessageFormat;
 import java.util.regex.Pattern;
 

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

@@ -24,14 +24,14 @@ public class XAttrEncodingParam extends EnumParam<XAttrCodec> {
   public static final String NAME = "encoding";
   /** Default parameter value. */
   public static final String DEFAULT = "";
-  
-  private static final Domain<XAttrCodec> DOMAIN = 
+
+  private static final Domain<XAttrCodec> DOMAIN =
       new Domain<XAttrCodec>(NAME, XAttrCodec.class);
-  
+
   public XAttrEncodingParam(final XAttrCodec encoding) {
     super(DOMAIN, encoding);
   }
-  
+
   /**
    * Constructor.
    * @param str a string representation of the parameter value.
@@ -44,12 +44,12 @@ public class XAttrEncodingParam extends EnumParam<XAttrCodec> {
   public String getName() {
     return NAME;
   }
-  
+
   @Override
   public String getValueString() {
     return value.toString();
   }
-  
+
   public XAttrCodec getEncoding() {
     return getValue();
   }

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

@@ -24,10 +24,10 @@ public class XAttrNameParam extends StringParam {
   public static final String NAME = "xattr.name";
   /** Default parameter value. **/
   public static final String DEFAULT = "";
-  
+
   private static Domain DOMAIN = new Domain(NAME,
       Pattern.compile(".*"));
-  
+
   public XAttrNameParam(final String str) {
     super(DOMAIN, str == null || str.equals(DEFAULT) ? null : str);
   }
@@ -36,7 +36,7 @@ public class XAttrNameParam extends StringParam {
   public String getName() {
     return NAME;
   }
-  
+
   public String getXAttrName() {
     final String v = getValue();
     return v;

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

@@ -33,7 +33,7 @@ public class XAttrSetFlagParam extends EnumSetParam<XAttrSetFlag> {
   public XAttrSetFlagParam(final EnumSet<XAttrSetFlag> flag) {
     super(DOMAIN, flag);
   }
-  
+
   /**
    * Constructor.
    * @param str a string representation of the parameter value.
@@ -46,7 +46,7 @@ public class XAttrSetFlagParam extends EnumSetParam<XAttrSetFlag> {
   public String getName() {
     return NAME;
   }
-  
+
   public EnumSet<XAttrSetFlag> getFlag() {
     return getValue();
   }

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

@@ -26,9 +26,9 @@ public class XAttrValueParam extends StringParam {
   public static final String NAME = "xattr.value";
   /** Default parameter value. **/
   public static final String DEFAULT = "";
-  
+
   private static Domain DOMAIN = new Domain(NAME, null);
-  
+
   public XAttrValueParam(final String str) {
     super(DOMAIN, str == null || str.equals(DEFAULT) ? null : str);
   }
@@ -37,7 +37,7 @@ public class XAttrValueParam extends StringParam {
   public String getName() {
     return NAME;
   }
-  
+
   public byte[] getXAttrValue() throws IOException {
     final String v = getValue();
     return XAttrCodec.decodeValue(v);

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

@@ -402,6 +402,8 @@ Release 2.8.0 - UNRELEASED
     HDFS-8025. Addendum fix for HDFS-3087 Decomissioning on NN restart can
     complete without blocks being replicated. (Ming Ma via wang)
 
+    HDFS-8089. Move o.a.h.hdfs.web.resources.* to the client jars. (wheat9)
+
   OPTIMIZATIONS
 
     HDFS-8026. Trace FSOutputSummer#writeChecksumChunks rather than

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

@@ -34,10 +34,15 @@ import org.apache.hadoop.http.HttpConfig;
  */
 @InterfaceAudience.Private
 public class DFSConfigKeys extends CommonConfigurationKeys {
-  public static final String  DFS_BLOCK_SIZE_KEY = "dfs.blocksize";
-  public static final long    DFS_BLOCK_SIZE_DEFAULT = 128*1024*1024;
-  public static final String  DFS_REPLICATION_KEY = "dfs.replication";
-  public static final short   DFS_REPLICATION_DEFAULT = 3;
+  public static final String  DFS_BLOCK_SIZE_KEY =
+      HdfsClientConfigKeys.DFS_BLOCK_SIZE_KEY;
+  public static final long    DFS_BLOCK_SIZE_DEFAULT =
+      HdfsClientConfigKeys.DFS_BLOCK_SIZE_DEFAULT;
+  public static final String  DFS_REPLICATION_KEY =
+      HdfsClientConfigKeys.DFS_REPLICATION_KEY;
+  public static final short   DFS_REPLICATION_DEFAULT =
+      HdfsClientConfigKeys.DFS_REPLICATION_DEFAULT;
+
   public static final String  DFS_STREAM_BUFFER_SIZE_KEY = "dfs.stream-buffer-size";
   public static final int     DFS_STREAM_BUFFER_SIZE_DEFAULT = 4096;
   public static final String  DFS_BYTES_PER_CHECKSUM_KEY = "dfs.bytes-per-checksum";
@@ -49,7 +54,7 @@ public class DFSConfigKeys extends CommonConfigurationKeys {
   public static final String  DFS_HDFS_BLOCKS_METADATA_ENABLED = "dfs.datanode.hdfs-blocks-metadata.enabled";
   public static final boolean DFS_HDFS_BLOCKS_METADATA_ENABLED_DEFAULT = false;
   public static final 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})?)*$";
+      HdfsClientConfigKeys.DFS_WEBHDFS_ACL_PERMISSION_PATTERN_DEFAULT;
 
   // HA related configuration
   public static final String  DFS_DATANODE_RESTART_REPLICA_EXPIRY_KEY = "dfs.datanode.restart.replica.expiration";
@@ -154,7 +159,8 @@ public class DFSConfigKeys extends CommonConfigurationKeys {
   public static final String  DFS_WEBHDFS_AUTHENTICATION_FILTER_KEY = "dfs.web.authentication.filter";
   public static final String  DFS_WEBHDFS_AUTHENTICATION_FILTER_DEFAULT = AuthFilter.class.getName();
   public static final String  DFS_WEBHDFS_USER_PATTERN_KEY = "dfs.webhdfs.user.provider.user.pattern";
-  public static final String  DFS_WEBHDFS_USER_PATTERN_DEFAULT = "^[A-Za-z_][A-Za-z0-9._-]*[$]?$";
+  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";
   public static final boolean DFS_PERMISSIONS_ENABLED_DEFAULT = true;
   public static final String  DFS_PERMISSIONS_SUPERUSERGROUP_KEY = "dfs.permissions.superusergroup";