php - uploading large object to Cloudfiles returns different md5 -


So I have this code and I'm trying to upload large files according to the rackspace: 

  $ src_path = 'pathtofile.zip'; // approximately $ 700MB $ md5_checksum = md5_file ($ src_path); // result is f210775ccff9b0e4f686ea49ac4932c2 $ trans_opts = array ('name' = & gt; $ md5_checksum, 'concurrency' = & gt; 6, 'partSize' => 25000000); $ Trans_opts ['path'] = $ src_path; $ Transfer = $ Container- & gt; SetupObjectTransfer ($ trans_opts); $ Response = $ transfer-> Upload ();

The file has been uploaded which is alright

However, when I try to download the suggested file here:

< Pre> $ name = 'f210775ccff9b0e4f686ea49ac4932c2'; $ Object = $ container- & gt; GetObject ($ name); $ ObjectContent = $ object- & gt; GetContent (); $ Pathtofile = 'destinationpathforfile.zip'; $ ObjectContent- & gt; Rewind (); $ Stream = $ object content- & gt; Gaststream (); File_put_contents ($ pathtofile, $ stream); $ MD5 = MD5_file ($ pathfile);

The result of md5_file varies from 'f210775ccff9b0e4f686ea49ac4932c2' .... Also the downloaded zip is being corrupted /

What did I do?

It is recommended that you only exceed 5 GB files For files under this threshold, you can use the common method.

When you use the transfer builder, it splits your large file into a small segment (you share the size) and upload it all together when this process ends So, a manifest file is created in which all of these segments are listed when you download the manifest file, these are all molded together, effectively forming a large file Busts it but it's actually a organizer.

To come back to answer your question, the intake header of a manifest file is not calculated how you can think. What you are currently doing is taking the MD5 checksum of the full 700MB file, and compare it with the MD5 checksum of the MANIFEST file. But these are not comparable, it is calculated by taking the tag header with the attributes of each segment, adding them together and then returning the results of the MD5 checksum.

There are also Downsides to use this DLO operation, which you need to be aware of:

End-to-end integrity is not uncertain The last consistency model means that although you have uploaded a block object, this container can not be displayed immediately in the list if you have an object appearing in the container If you download the first manifest, then object GET followed Respondents will not be part of the material received in response.

If you believe that there has been an error in transmission, it is probably because an HTTP request failed on the way. You can use (using the backoff plugin) to try again unsuccessful requests.

You can also check every network transaction to help debug it. However, if you exercise caution, echo the HTTP Request Body (> 25 MB) in STDOT by using the above you would like to use it instead: 

  Use ghazal \ plugin \ log \ log plugin; Use the Gazle \ Log \ Closer Lag Adapter; $ Stream = fopen ('php: // output', 'w'); $ LogSubscriber = New log plugin (use new Closure Log Adapter (function ($ M) ($ stream) {Fillit ($ stream, $ m.php_eol);}), "# request: \ n {url} {method} \ N \ n # response: \ n {code} {phrase} \ n \ n # connect time: {connect_time} \ n \ n # total time: {total_time} ", incorrect); $ Customer & gt; AddSubscriber ($ logSubscriber);

As you can see, you are using a template to direct when output is done. There is a complete list of template variables.


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