boolean isAccessor(Region<?, ?> region) {
    if (!region.getAttributes().getDataPolicy().withStorage()) {
      return true;
    }
    return region.getAttributes().getPartitionAttributes() != null
        && region.getAttributes().getPartitionAttributes().getLocalMaxMemory() == 0;
  }
Change the existing region to have
the JdbcLoader as its cache-loader
and the given async-event-queue as one of its queues.
geode-connectors/src/main/java/org/apache/geode/connectors/jdbc/internal/cli/CreateMappingFunction.java