HBASE-28055 Performance improvement for scan over several stores.

Author: ss77892

hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/StoreScanner.java

@@ -29,6 +29,7 @@
 import org.apache.hadoop.hbase.CellComparator;
 import org.apache.hadoop.hbase.CellUtil;
 import org.apache.hadoop.hbase.DoNotRetryIOException;
+import org.apache.hadoop.hbase.HConstants;
 import org.apache.hadoop.hbase.KeyValue;
 import org.apache.hadoop.hbase.KeyValueUtil;
 import org.apache.hadoop.hbase.PrivateCellUtil;
@@ -935,7 +936,7 @@ protected boolean trySkipToNextColumn(Cell cell) throws IOException {
     // We need this check because it may happen that the new scanner that we get
     // during heap.next() is requiring reseek due of fake KV previously generated for
     // ROWCOL bloom filter optimization. See HBASE-19863 for more details
-    if (useRowColBloom && nextCell != null && matcher.compareKeyForNextColumn(nextCell, cell) < 0) {
+    if (useRowColBloom && nextCell != null && cell.getTimestamp() == PrivateConstants.OLDEST_TIMESTAMP) {
       return false;
     }
     return true;