public boolean isLatestTimestamp() {
    return Bytes.equals(getBuffer(), getTimestampOffset(), Bytes.SIZEOF_LONG,
      HConstants.LATEST_TIMESTAMP_BYTES, 0, Bytes.SIZEOF_LONG);
  }
Returns True if this KeyValue has a LATEST_TIMESTAMP timestamp.
hbase-common/src/main/java/org/apache/hadoop/hbase/KeyValue.java