LoadBalancingKMSClientProvider#warmUpEncryptedKeys swallows IOException

  @Override
  public void warmUpEncryptedKeys(String... keyNames)
      throws IOException {
    try {
      encKeyVersionQueue.initializeQueuesForKeys(keyNames);
    } catch (ExecutionException e) {
      throw new IOException(e);
    }
  }

   // This request is sent to all providers in the load-balancing group
  @Override
  public void warmUpEncryptedKeys(String... keyNames) throws IOException {
    for (KMSClientProvider provider : providers) {
      try {
        provider.warmUpEncryptedKeys(keyNames);
      } catch (IOException ioe) {
        LOG.error(
            "Error warming up keys for provider with url"
            + "[" + provider.getKMSUrl() + "]", ioe);
      }
    }
  }