HBASE-13377 Canary may generate false alarm on the first region when there are many delete markers (He Liangliang)

hbase-server/src/main/java/org/apache/hadoop/hbase/tool/Canary.java

@@ -178,6 +178,7 @@ public final class Canary implements Tool {
           get.addFamily(column.getName());
         } else {
           scan = new Scan();
+          scan.setRaw(true);
           scan.setCaching(1);
           scan.setCacheBlocks(false);
           scan.setFilter(new FirstKeyOnlyFilter());