fix javadoc

Author: LiuGuH

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

@@ -600,10 +600,9 @@ public FSDataOutputStream next(final FileSystem fs, final Path p)
    * inherited policy.
    *
    */
-  public HdfsDataOutputStream create(
-      final Path f, final FsPermission permission,
-      final EnumSet<CreateFlag> flag, final int bufferSize,
-      final short replication, final long blockSize,
+  public HdfsDataOutputStream create(final Path f,
+      final FsPermission permission, final EnumSet<CreateFlag> flag,
+      final int bufferSize, final short replication, final long blockSize,
       final Progressable progress, final ChecksumOpt checksumOpt,
       final InetSocketAddress[] favoredNodes, final String ecPolicyName,
       final String storagePolicy)

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

@@ -248,6 +248,7 @@ void blockGroupChecksum(StripedBlockInfo stripedBlockInfo,
    * @param targetBlk the block to be writted.
    * @param targetBlockToken security token for accessing targetBlk.
    * @param targetDatanode the target datnode which sourceBlk will copy to as targetBlk.
+   * @throws IOException throws IOException
    */
   void copyBlockCrossNamespace(ExtendedBlock sourceBlk,
       Token<BlockTokenIdentifier> sourceBlockToken, ExtendedBlock targetBlk,

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/FsDatasetSpi.java

@@ -717,6 +717,7 @@ default void setLastDirScannerFinishTime(long time) {}
    * @param dstBlock
    *          the destination block to which the srcBlock needs to be copied to
    * @throws IOException
+   *          throws IOException
    */
   void hardLinkOneBlock(ExtendedBlock srcBlock, ExtendedBlock dstBlock)
       throws IOException;