HBASE-13368 - Hash.java is declared as public Interface - but it should be

Private (Ram)

hbase-common/src/main/java/org/apache/hadoop/hbase/util/Hash.java

@@ -26,7 +26,7 @@ import org.apache.hadoop.hbase.classification.InterfaceStability;
 /**
  * This class represents a common API for hashing functions.
  */
-@InterfaceAudience.Public
+@InterfaceAudience.Private
 @InterfaceStability.Stable
 public abstract class Hash {
   /** Constant to denote invalid hash type. */

hbase-common/src/main/java/org/apache/hadoop/hbase/util/JenkinsHash.java

@@ -42,7 +42,7 @@ import org.apache.hadoop.hbase.classification.InterfaceStability;
  * @see <a href="http://burtleburtle.net/bob/hash/doobs.html">Has update on the
  * Dr. Dobbs Article</a>
  */
-@InterfaceAudience.Public
+@InterfaceAudience.Private
 @InterfaceStability.Stable
 public class JenkinsHash extends Hash {
   private static final int BYTE_MASK = 0xff;

hbase-common/src/main/java/org/apache/hadoop/hbase/util/MurmurHash.java

@@ -29,7 +29,7 @@ import org.apache.hadoop.hbase.classification.InterfaceStability;
  * <p>The C version of MurmurHash 2.0 found at that site was ported
  * to Java by Andrzej Bialecki (ab at getopt org).</p>
  */
-@InterfaceAudience.Public
+@InterfaceAudience.Private
 @InterfaceStability.Stable
 public class MurmurHash extends Hash {
   private static MurmurHash _instance = new MurmurHash();

hbase-common/src/main/java/org/apache/hadoop/hbase/util/MurmurHash3.java

@@ -28,7 +28,7 @@ import org.apache.hadoop.hbase.classification.InterfaceStability;
  * <p>MurmurHash3 is the successor to MurmurHash2. It comes in 3 variants, and
  * the 32-bit version targets low latency for hash table use.</p>
  */
-@InterfaceAudience.Public
+@InterfaceAudience.Private
 @InterfaceStability.Stable
 public class MurmurHash3 extends Hash {
   private static MurmurHash3 _instance = new MurmurHash3();