private CopyException convertToCopyException(String jobIdPrefix, String suffix, Exception e) {
    if (e.getClass() == RetryException.class
        && CopyExceptionWithFailureReason.class.isAssignableFrom(e.getCause().getClass())) {
      return (CopyExceptionWithFailureReason) e.getCause();
    }
    return new CopyException(jobIdPrefix + "Error happened during " + suffix, e);
  }
Kicks off transfer job {@code jobId} from {@code exporter} to {@code importer}.
portability-transfer/src/main/java/org/datatransferproject/transfer/copier/PortabilityAbstractInMemoryDataCopier.java