HBASE-5838. Add an LZ4 compression option to HFile

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1350844 13f79535-47bb-0310-9956-ffa450edef68

hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/Compression.java

@@ -180,6 +180,25 @@ public final class Compression {
           }
           return snappyCodec;
         }
+    },
+    LZ4("lz4") {
+      // Use base type to avoid compile-time dependencies.
+      private transient CompressionCodec lz4Codec;
+
+      @Override
+      CompressionCodec getCodec(Configuration conf) {
+        if (lz4Codec == null) {
+          try {
+            Class<?> externalCodec =
+                getClassLoaderForCodec().loadClass("org.apache.hadoop.io.compress.Lz4Codec");
+            lz4Codec = (CompressionCodec) ReflectionUtils.newInstance(externalCodec, 
+                conf);
+          } catch (ClassNotFoundException e) {
+            throw new RuntimeException(e);
+          }
+        }
+        return lz4Codec;
+      }
   };
 
     private final Configuration conf;

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

@@ -281,12 +281,14 @@ public class TestHFile extends HBaseTestCase {
   }
 
   /**
-   * Make sure the orginals for our compression libs doesn't change on us.
+   * Make sure the ordinals for our compression algorithms do not change on us.
    */
   public void testCompressionOrdinance() {
     assertTrue(Compression.Algorithm.LZO.ordinal() == 0);
     assertTrue(Compression.Algorithm.GZ.ordinal() == 1);
     assertTrue(Compression.Algorithm.NONE.ordinal() == 2);
+    assertTrue(Compression.Algorithm.SNAPPY.ordinal() == 3);
+    assertTrue(Compression.Algorithm.LZ4.ordinal() == 4);
   }
 
   public void testComparator() throws IOException {