@Override
    public InitiateMultipartUploadResult initiateMultipartUpload(InitiateMultipartUploadRequest request) {
        request = beforeClientExecution(request);
        return executeInitiateMultipartUpload(request);
    }
<p>
This operation initiates a multipart upload. Amazon S3 Glacier creates a multipart upload resource and returns
its ID in the response. The multipart upload ID is used in subsequent requests to upload parts of an archive (see
<a>UploadMultipartPart</a>).
</p>
<p>
When you initiate a multipart upload, you specify the part size in number of bytes. The part size must be a
megabyte (1024 KB) multiplied by a power of 2-for example, 1048576 (1 MB), 2097152 (2 MB), 4194304 (4 MB),
8388608 (8 MB), and so on. The minimum allowable part size is 1 MB, and the maximum is 4 GB.
</p>
<p>
Every part you upload to this resource (see <a>UploadMultipartPart</a>), except the last one, must have the same
size. The last one can be the same size or smaller. For example, suppose you want to upload a 16.2 MB file. If
you initiate the multipart upload with a part size of 4 MB, you will upload four parts of 4 MB each and one part
of 0.2 MB.
</p>
<note>
<p>
You don't need to know the size of the archive when you start a multipart upload because Amazon S3 Glacier does
not require you to specify the overall archive size.
</p>
</note>
<p>
After you complete the multipart upload, Amazon S3 Glacier (Glacier) removes the multipart upload resource
referenced by the ID. Glacier also removes the multipart upload resource if you cancel the multipart upload or it
may be removed if there is no activity for a period of 24 hours.
</p>
<p>
An AWS account has full permission to perform all operations (actions). However, AWS Identity and Access
Management (IAM) users don't have any permissions by default. You must grant them explicit permission to perform
specific actions. For more information, see <a
href="https://docs.aws.amazon.com/amazonglacier/latest/dev/using-iam-with-amazon-glacier.html">Access Control
Using AWS Identity and Access Management (IAM)</a>.
</p>
<p>
For conceptual information and underlying REST API, see <a
href="https://docs.aws.amazon.com/amazonglacier/latest/dev/uploading-archive-mpu.html">Uploading Large Archives
in Parts (Multipart Upload)</a> and <a
href="https://docs.aws.amazon.com/amazonglacier/latest/dev/api-multipart-initiate-upload.html">Initiate Multipart
Upload</a> in the <i>Amazon Glacier Developer Guide</i>.
</p>

@param initiateMultipartUploadRequest
       Provides options for initiating a multipart upload to an Amazon S3 Glacier vault.
@return Result of the InitiateMultipartUpload operation returned by the service.
@throws ResourceNotFoundException
        Returned if the specified resource (such as a vault, upload ID, or job ID) doesn't exist.
@throws InvalidParameterValueException
        Returned if a parameter of the request is incorrectly specified.
@throws MissingParameterValueException
        Returned if a required header or parameter is missing from the request.
@throws ServiceUnavailableException
        Returned if the service cannot complete the request.
@sample AmazonGlacier.InitiateMultipartUpload
aws-java-sdk-glacier/src/main/java/com/amazonaws/services/glacier/AmazonGlacierClient.java