HDFS-2976. Merging change r1298495, r1298507 and r1298508 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1609848 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -70,9 +70,7 @@
 import java.io.OutputStream;
 import java.net.InetAddress;
 import java.net.InetSocketAddress;
-import java.net.NetworkInterface;
 import java.net.Socket;
-import java.net.SocketException;
 import java.net.SocketAddress;
 import java.net.URI;
 import java.net.UnknownHostException;
@@ -112,12 +110,12 @@
 import org.apache.hadoop.fs.MD5MD5CRC32FileChecksum;
 import org.apache.hadoop.fs.MD5MD5CRC32GzipFileChecksum;
 import org.apache.hadoop.fs.Options;
-import org.apache.hadoop.fs.RemoteIterator;
 import org.apache.hadoop.fs.XAttr;
 import org.apache.hadoop.fs.XAttrSetFlag;
 import org.apache.hadoop.fs.Options.ChecksumOpt;
 import org.apache.hadoop.fs.ParentNotDirectoryException;
 import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.fs.RemoteIterator;
 import org.apache.hadoop.fs.UnresolvedLinkException;
 import org.apache.hadoop.fs.VolumeId;
 import org.apache.hadoop.fs.permission.AclEntry;
@@ -129,6 +127,7 @@
 import org.apache.hadoop.hdfs.net.Peer;
 import org.apache.hadoop.hdfs.net.TcpPeerServer;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveEntry;
+import org.apache.hadoop.hdfs.protocol.CacheDirectiveInfo;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveIterator;
 import org.apache.hadoop.hdfs.protocol.CachePoolEntry;
 import org.apache.hadoop.hdfs.protocol.CachePoolInfo;
@@ -141,7 +140,6 @@
 import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
 import org.apache.hadoop.hdfs.protocol.HdfsBlocksMetadata;
 import org.apache.hadoop.hdfs.protocol.HdfsConstants;
-import org.apache.hadoop.hdfs.protocol.CacheDirectiveInfo;
 import org.apache.hadoop.hdfs.protocol.HdfsConstants.DatanodeReportType;
 import org.apache.hadoop.hdfs.protocol.HdfsConstants.RollingUpgradeAction;
 import org.apache.hadoop.hdfs.protocol.HdfsConstants.SafeModeAction;
@@ -163,8 +161,8 @@
 import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.BlockOpResponseProto;
 import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.OpBlockChecksumResponseProto;
 import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.Status;
-import org.apache.hadoop.hdfs.security.token.block.DataEncryptionKey;
 import org.apache.hadoop.hdfs.protocolPB.PBHelper;
+import org.apache.hadoop.hdfs.security.token.block.DataEncryptionKey;
 import org.apache.hadoop.hdfs.security.token.block.InvalidBlockTokenException;
 import org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenIdentifier;
 import org.apache.hadoop.hdfs.server.common.HdfsServerConstants;
@@ -1003,33 +1001,6 @@ public static boolean isLocalAddress(InetSocketAddress targetAddr) {
     return local;
   }
   
-  /**
-   * Should the block access token be refetched on an exception
-   * 
-   * @param ex Exception received
-   * @param targetAddr Target datanode address from where exception was received
-   * @return true if block access token has expired or invalid and it should be
-   *         refetched
-   */
-  private static boolean tokenRefetchNeeded(IOException ex,
-      InetSocketAddress targetAddr) {
-    /*
-     * Get a new access token and retry. Retry is needed in 2 cases. 1) When
-     * both NN and DN re-started while DFSClient holding a cached access token.
-     * 2) In the case that NN fails to update its access key at pre-set interval
-     * (by a wide margin) and subsequently restarts. In this case, DN
-     * re-registers itself with NN and receives a new access key, but DN will
-     * delete the old access key from its memory since it's considered expired
-     * based on the estimated expiration date.
-     */
-    if (ex instanceof InvalidBlockTokenException || ex instanceof InvalidToken) {
-      LOG.info("Access token was invalid when connecting to " + targetAddr
-          + " : " + ex);
-      return true;
-    }
-    return false;
-  }
-  
   /**
    * Cancel a delegation token
    * @param token the token to cancel