Google App Engine中的Blobstore对象的1MB配额限制？

我使用 App Engine（版本1.4.3）直接编写blobstore 以保存图像。
当我尝试存储大于1MB的图片时我收到以下异常

I'm using App Engine (version 1.4.3) direct write the blobstore in order to save images. when I try to store an image which is larger than 1MB I get the following Exception

com.google.apphosting.api.ApiProxy$RequestTooLargeException: The request to API call datastore_v3.Put() was too large.

我认为每个对象的限制为2GB

这里是存储Java代码图像

Here is the Java code that stores the image

private void putInBlobStore(final String mimeType, final byte[] data) throws IOException {
    final FileService fileService = FileServiceFactory.getFileService();
    final AppEngineFile file = fileService.createNewBlobFile(mimeType);
    final FileWriteChannel writeChannel = fileService.openWriteChannel(file, true);
    writeChannel.write(ByteBuffer.wrap(data));
    writeChannel.closeFinally();
}