@Override
  public List<KeyValueScanner> getScanners(long readPoint) {
    List<KeyValueScanner> list = new ArrayList<>(segments.size());
    AbstractMemStore.addToScanners(segments, readPoint, list);
    return list;
  }
Creates the scanner for the given read point
@return a scanner for the given read point
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/CompositeImmutableSegment.java