HBASE-13579 Avoid isCellTTLExpired() for NO-TAG cases (Ram)

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

@@ -0,0 +1,37 @@
+/**
+ * Copyright The Apache Software Foundation
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.hbase;
+
+import org.apache.hadoop.hbase.classification.InterfaceAudience;
+
+/**
+ * An extension of the KeyValue where the tags length is always 0 
+ */
+@InterfaceAudience.Private
+public class NoTagsKeyValue extends KeyValue {
+  public NoTagsKeyValue(byte[] bytes, int offset, int length) {
+    super(bytes, offset, length);
+  }
+
+  @Override
+  public int getTagsLength() {
+    return 0;
+  }
+}

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

@@ -36,6 +36,7 @@ import org.apache.hadoop.hbase.Cell;
 import org.apache.hadoop.hbase.CellUtil;
 import org.apache.hadoop.hbase.HConstants;
 import org.apache.hadoop.hbase.KeyValue;
+import org.apache.hadoop.hbase.NoTagsKeyValue;
 import org.apache.hadoop.hbase.KeyValue.KVComparator;
 import org.apache.hadoop.hbase.fs.HFileSystem;
 import org.apache.hadoop.hbase.io.FSDataInputStreamWrapper;
@@ -823,12 +824,21 @@ public class HFileReaderImpl implements HFile.Reader, Configurable {
       if (!isSeeked())
         return null;
 
+      if(currTagsLen > 0) {
         KeyValue ret = new KeyValue(blockBuffer.array(), blockBuffer.arrayOffset()
             + blockBuffer.position(), getCellBufSize());
         if (this.reader.shouldIncludeMemstoreTS()) {
           ret.setSequenceId(currMemstoreTS);
         }
         return ret;
+      } else {
+        NoTagsKeyValue ret = new NoTagsKeyValue(blockBuffer.array(),
+            blockBuffer.arrayOffset() + blockBuffer.position(), getCellBufSize());
+        if (this.reader.shouldIncludeMemstoreTS()) {
+          ret.setSequenceId(currMemstoreTS);
+        }
+        return ret;
+      }
     }
 
     @Override