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https://issues.apache.org/jira/browse/JCLOUDS-769?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14379479#comment-14379479
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Akos Hajnal commented on JCLOUDS-769:
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I also think that users should see a simple output stream interface only (even 
if its performance is not as good as it could be). What I wrote about is the 
backend implementation. If users have to deal with parts and sizes, they are 
better to use S3 API directly. 

> Upload blob from stream
> -----------------------
>
>                 Key: JCLOUDS-769
>                 URL: https://issues.apache.org/jira/browse/JCLOUDS-769
>             Project: jclouds
>          Issue Type: New Feature
>          Components: jclouds-blobstore
>    Affects Versions: 1.8.1
>            Reporter: Akos Hajnal
>              Labels: multipart, s3
>
> Dear Developers,
> It was not easy, but using S3 API, it was possible to upload a large blob 
> from stream - without knowing its size in advance (and storing all the data 
> locally). I found solutions using jclouds' aws-s3 specific API (some async 
> interface), but I really miss this feature from jclouds' general API.
> My dream is to have a method like:
> blob.getOutputStream() into which I can write as many data as I want, 
> which pushes data to the storage simultaneously until I close the stream.
> (When I used S3, I created a wrapper class extending OutputStream, which 
> initiates multipart upload, buffers data written to the output stream, writes 
> a part when the buffer is full, and finalizes multipart upload on stream 
> close.) 
> I don't know it is possible for all providers, but I really miss it...
> Thank you,
> Akos Hajnal



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