HBASE-13945 - Prefix_Tree seekBefore() does not work correctly (Ram)

hbase-common/src/main/java/org/apache/hadoop/hbase/KeyValueUtil.java

@@ -105,11 +105,15 @@ public class KeyValueUtil {
     return kvCell;
   }
 
+  /**
+   * The position will be set to the beginning of the new ByteBuffer
+   * @param cell
+   * @return the Bytebuffer containing the key part of the cell
+   */
   public static ByteBuffer copyKeyToNewByteBuffer(final Cell cell) {
     byte[] bytes = new byte[keyLength(cell)];
     appendKeyTo(cell, bytes, 0);
     ByteBuffer buffer = ByteBuffer.wrap(bytes);
-    buffer.position(buffer.limit());//make it look as if each field were appended
     return buffer;
   }
 
@@ -151,11 +155,15 @@ public class KeyValueUtil {
     return pos;
   }
 
+  /**
+   * The position will be set to the beginning of the new ByteBuffer
+   * @param cell
+   * @return the ByteBuffer containing the cell
+   */
   public static ByteBuffer copyToNewByteBuffer(final Cell cell) {
     byte[] bytes = new byte[length(cell)];
     appendToByteArray(cell, bytes, 0);
     ByteBuffer buffer = ByteBuffer.wrap(bytes);
-    buffer.position(buffer.limit());//make it look as if each field were appended
     return buffer;
   }
 

hbase-common/src/main/java/org/apache/hadoop/hbase/io/encoding/BufferedDataBlockEncoder.java

@@ -582,6 +582,7 @@ abstract class BufferedDataBlockEncoder implements DataBlockEncoder {
     public ByteBuffer getKeyDeepCopy() {
       ByteBuffer keyBuffer = ByteBuffer.allocate(current.keyLength);
       keyBuffer.put(current.keyBuffer, 0, current.keyLength);
+      keyBuffer.rewind();
       return keyBuffer;
     }
 
@@ -616,6 +617,7 @@ abstract class BufferedDataBlockEncoder implements DataBlockEncoder {
           kvBuffer.put(current.tagsBuffer, 0, current.tagsLength);
         }
       }
+      kvBuffer.rewind();
       return kvBuffer;
     }
 

hbase-common/src/main/java/org/apache/hadoop/hbase/io/encoding/DataBlockEncoder.java

@@ -154,7 +154,8 @@ public interface DataBlockEncoder {
      */
     ByteBuffer getValueShallowCopy();
     
-    /** @return key value at current position with position set to limit */
+    //TODO : to be removed - currently used in testcases only
+    /** @return a key value buffer with the position set at the beginning of the buffer */
     ByteBuffer getKeyValueBuffer();
 
     /**

hbase-server/src/test/java/org/apache/hadoop/hbase/io/hfile/TestSeekTo.java

@@ -64,11 +64,8 @@ public class TestSeekTo {
   public static Collection<Object[]> parameters() {
     List<Object[]> paramList = new ArrayList<Object[]>();
     for (DataBlockEncoding encoding : DataBlockEncoding.values()) {
-      // Remove after HBASE-13939
-      if (encoding != DataBlockEncoding.PREFIX_TREE) {
       paramList.add(new Object[] { encoding });
     }
-    }
     return paramList;
   }