List<KeyValueScanner> getAllScannersForTesting() {
    List<KeyValueScanner> allScanners = new ArrayList<>();
    KeyValueScanner current = heap.getCurrentForTesting();
    if (current != null) allScanners.add(current);
    for (KeyValueScanner scanner : heap.getHeap())
      allScanners.add(scanner);
    return allScanners;
  }
Used in testing.
@return all scanners in no particular order
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/StoreScanner.java