public SnapshotFileMapper getMapper() {
    if (mapper == null) {
      mapper = isParallelMode() ? new ParallelSnapshotFileMapper()
          : RegionSnapshotServiceImpl.LOCAL_MAPPER;
    }
    return mapper;
  }
Returns the snapshot file mapper for parallel import and export.

@return the mapper
@see #setParallelMode(boolean)
geode-core/src/main/java/org/apache/geode/internal/cache/snapshot/SnapshotOptionsImpl.java