apollo-client/src/main/java/com/ctrip/framework/apollo/internals/LocalFileConfigRepository.java/LocalFileConfigRepository/trySyncFromUpstream
class LocalFileConfigRepository:  private boolean trySyncFromUpstream() {
    if (m_upstream == null) {
      return false;
    }
    try {
      updateFileProperties(m_upstream.getConfig(), m_upstream.getSourceType());
      return true;
    } catch (Throwable ex) {
      Tracer.logError(ex);
      logger
          .warn("Sync config from upstream repository {} failed, reason: {}", m_upstream.getClass(),
              ExceptionUtil.getDetailMessage(ex));
    }
    return false;
  }