HADOOP-14904. Fix javadocs issues in Hadoop HDFS. Contributed by Mukul Kumar Singh.

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockIdManager.java

@@ -24,6 +24,8 @@ import org.apache.hadoop.hdfs.protocol.BlockType;
 import org.apache.hadoop.hdfs.protocol.HdfsConstants;
 import org.apache.hadoop.hdfs.server.common.GenerationStamp;
 import org.apache.hadoop.hdfs.server.common.HdfsServerConstants;
+import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
+import org.apache.hadoop.hdfs.server.namenode.FSEditLog;
 
 import java.io.IOException;
 
@@ -31,8 +33,8 @@ import static org.apache.hadoop.hdfs.protocol.BlockType.STRIPED;
 
 /**
  * BlockIdManager allocates the generation stamps and the block ID. The
- * {@see FSNamesystem} is responsible for persisting the allocations in the
- * {@see EditLog}.
+ * {@link FSNamesystem} is responsible for persisting the allocations in the
+ * {@link FSEditLog}.
  */
 public class BlockIdManager {
   /**

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

@@ -44,6 +44,7 @@ import org.apache.hadoop.hdfs.shortcircuit.ShortCircuitShm.SlotId;
 import org.apache.hadoop.io.nativeio.SharedFileDescriptorFactory;
 import org.apache.hadoop.net.unix.DomainSocket;
 import org.apache.hadoop.net.unix.DomainSocketWatcher;
+import org.apache.hadoop.hdfs.shortcircuit.DfsClientShmManager;
 
 import com.google.common.base.Joiner;
 import com.google.common.base.Preconditions;

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/checker/AbstractFuture.java

@@ -40,6 +40,7 @@ import java.util.concurrent.Future;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
 import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
+import java.util.concurrent.ThreadPoolExecutor.CallerRunsPolicy;
 import java.util.concurrent.locks.LockSupport;
 import java.util.logging.Level;
 import java.util.logging.Logger;