Use CreateMultipartUpload with an AWS SDK or CLI - AWS SDK Code Examples

There are more AWS SDK examples available in the AWS Doc SDK Examples GitHub repo.

Use CreateMultipartUpload with an AWS SDK or CLI

The following code examples show how to use CreateMultipartUpload.

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C++
SDK for C++
Note

There's more on GitHub. Find the complete example and learn how to set up and run in the AWS Code Examples Repository.

//! Create a multipart upload. /*! \param bucket: The name of the S3 bucket where the object will be uploaded. \param key: The unique identifier (key) for the object within the S3 bucket. \param client: The S3 client instance used to perform the upload operation. \return Aws::String: Upload ID or empty string if failed. */ Aws::String AwsDoc::S3::createMultipartUpload(const Aws::String &bucket, const Aws::String &key, Aws::S3::Model::ChecksumAlgorithm checksumAlgorithm, const Aws::S3::S3Client &client) { Aws::S3::Model::CreateMultipartUploadRequest request; request.SetBucket(bucket); request.SetKey(key); if (checksumAlgorithm != Aws::S3::Model::ChecksumAlgorithm::NOT_SET) { request.SetChecksumAlgorithm(checksumAlgorithm); } Aws::S3::Model::CreateMultipartUploadOutcome outcome = client.CreateMultipartUpload(request); Aws::String uploadID; if (outcome.IsSuccess()) { uploadID = outcome.GetResult().GetUploadId(); } else { std::cerr << "Error creating multipart upload: " << outcome.GetError().GetMessage() << std::endl; } return uploadID; }
CLI
AWS CLI

The following command creates a multipart upload in the bucket my-bucket with the key multipart/01:

aws s3api create-multipart-upload --bucket my-bucket --key 'multipart/01'

Output:

{ "Bucket": "my-bucket", "UploadId": "dfRtDYU0WWCCcH43C3WFbkRONycyCpTJJvxu2i5GYkZljF.Yxwh6XG7WfS2vC4to6HiV6Yjlx.cph0gtNBtJ8P3URCSbB7rjxI5iEwVDmgaXZOGgkk5nVTW16HOQ5l0R", "Key": "multipart/01" }

The completed file will be named 01 in a folder called multipart in the bucket my-bucket. Save the upload ID, key and bucket name for use with the upload-part command.

Rust
SDK for Rust
Note

There's more on GitHub. Find the complete example and learn how to set up and run in the AWS Code Examples Repository.

// Create a multipart upload. Use UploadPart and CompleteMultipartUpload to // upload the file. let multipart_upload_res: CreateMultipartUploadOutput = client .create_multipart_upload() .bucket(&bucket_name) .key(&key) .send() .await?; let upload_id = multipart_upload_res.upload_id().ok_or(S3ExampleError::new( "Missing upload_id after CreateMultipartUpload", ))?;
let mut upload_parts: Vec<aws_sdk_s3::types::CompletedPart> = Vec::new(); for chunk_index in 0..chunk_count { let this_chunk = if chunk_count - 1 == chunk_index { size_of_last_chunk } else { CHUNK_SIZE }; let stream = ByteStream::read_from() .path(path) .offset(chunk_index * CHUNK_SIZE) .length(Length::Exact(this_chunk)) .build() .await .unwrap(); // Chunk index needs to start at 0, but part numbers start at 1. let part_number = (chunk_index as i32) + 1; let upload_part_res = client .upload_part() .key(&key) .bucket(&bucket_name) .upload_id(upload_id) .body(stream) .part_number(part_number) .send() .await?; upload_parts.push( CompletedPart::builder() .e_tag(upload_part_res.e_tag.unwrap_or_default()) .part_number(part_number) .build(), ); }
// upload_parts: Vec<aws_sdk_s3::types::CompletedPart> let completed_multipart_upload: CompletedMultipartUpload = CompletedMultipartUpload::builder() .set_parts(Some(upload_parts)) .build(); let _complete_multipart_upload_res = client .complete_multipart_upload() .bucket(&bucket_name) .key(&key) .multipart_upload(completed_multipart_upload) .upload_id(upload_id) .send() .await?;