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Amazon S3: Is it possible to perform multipart upload file request using input stream?

I came across a few examples, where multi-part upload request is carried out using File Object. However, I wanted to know if it is possible to carry out the multi part upload using input stream instead of using file object. Please help.
Answer:

Only if you know the size of the stream ahead of time, which kind of defeats the purpose of the stream. Each part of a MultiPart upload is just a normal S3 upload and therefore needs to provide a Content-Length header in the initial request. The Google Storage service does support chunked transfer encoding and can accept streaming input.

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Other answers

Hi,You can use https://github.com/minio/mc, it handles multipart for you. For uploading via input stream you can use "$ mc pipe" command.EXAMPLES: 1. Write contents of stdin to a file on local filesystem. $ mc pipe /tmp/hello-world.go 2. Write contents of stdin to an object on Amazon S3 cloud storage. $ mc pipe s3/personalbuck/meeting-notes.txt 3. Copy an ISO image to an object on Amazon S3 cloud storage. $ cat debian-8.2.iso | mc pipe s3/ferenginar/gnuos.iso 4. Stream MySQL database dump to Amazon S3 directly. $ mysqldump -u root -p ******* accountsdb | mc pipe s3/ferenginar/backups/accountsdb-oct-9-2015.sql You can also use mc client libraries available in https://github.com/minio/minio-py, https://github.com/minio/minio-dotnet, https://github.com/minio/minio-java, https://github.com/minio/minio-go, https://github.com/minio/minio-js to do the same.Hope it helps.

Atul Jha

you can find sample code to upload file in multipart in java, without uisng AWS sdk http://dextercoder.blogspot.in/2012/02/multipart-upload-to-amazon-s3-in-three.html

Vishal Ghadge

Want to do multipart upload in S3 Java via InputStream .So,Content-length is not known to me.Also,using High Level Multipart Upload API,how to upload parts?

Avinash Kumar

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