HBASE-16710 Add ZStandard Codec to Compression.java

Signed-off-by: Andrew Purtell <apurtell@apache.org>

hbase-common/src/main/java/org/apache/hadoop/hbase/io/compress/Compression.java

@@ -262,6 +262,33 @@ public final class Compression {
           throw new RuntimeException(e);
         }
       }
+    },
+    ZSTD("zstd") {
+      // Use base type to avoid compile-time dependencies.
+      private volatile transient CompressionCodec zStandardCodec;
+      private transient Object lock = new Object();
+
+      @Override
+      CompressionCodec getCodec(Configuration conf) {
+        if (zStandardCodec == null) {
+          synchronized (lock) {
+            if (zStandardCodec == null) {
+              zStandardCodec = buildCodec(conf);
+            }
+          }
+        }
+        return zStandardCodec;
+      }
+
+      private CompressionCodec buildCodec(Configuration conf) {
+        try {
+          Class<?> externalCodec =
+              getClassLoaderForCodec().loadClass("org.apache.hadoop.io.compress.ZStandardCodec");
+          return (CompressionCodec) ReflectionUtils.newInstance(externalCodec, conf);
+        } catch (ClassNotFoundException e) {
+          throw new RuntimeException(e);
+        }
+      }
     };
 
     private final transient Configuration conf; // FindBugs: SE_BAD_FIELD so just made it transient

hbase-server/src/test/java/org/apache/hadoop/hbase/util/TestCompressionTest.java

@@ -75,6 +75,7 @@ public class TestCompressionTest {
       nativeCodecTest("LZ4", null, "org.apache.hadoop.io.compress.Lz4Codec");
       nativeCodecTest("SNAPPY", "snappy", "org.apache.hadoop.io.compress.SnappyCodec");
       nativeCodecTest("BZIP2", "bzip2", "org.apache.hadoop.io.compress.BZip2Codec");
+      nativeCodecTest("ZSTD", "zstd", "org.apache.hadoop.io.compress.ZStandardCodec");
     } else {
       // Hadoop nativelib is not available
       LOG.debug("Native code not loaded");
@@ -82,6 +83,7 @@ public class TestCompressionTest {
       assertFalse(CompressionTest.testCompression("LZ4"));
       assertFalse(CompressionTest.testCompression("SNAPPY"));
       assertFalse(CompressionTest.testCompression("BZIP2"));
+      assertFalse(CompressionTest.testCompression("ZSTD"));
     }
   }