Uploading Large Archives in Parts Using the Amazon SDK for Java - Amazon S3 Glacier
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Uploading Large Archives in Parts Using the Amazon SDK for Java

Both the high-level and low-level APIs provided by the Amazon SDK for Java provide a method to upload a large archive (see Uploading an Archive in Amazon S3 Glacier).

  • The high-level API provides a method that you can use to upload archives of any size. Depending on the file you are uploading, the method either uploads an archive in a single operation or uses the multipart upload support in Amazon S3 Glacier (S3 Glacier) to upload the archive in parts.

  • The low-level API maps close to the underlying REST implementation. Accordingly, it provides a method to upload smaller archives in one operation and a group of methods that support multipart upload for larger archives. This section explains uploading large archives in parts using the low-level API.

For more information about the high-level and low-level APIs, see Using the Amazon SDK for Java with Amazon S3 Glacier.

Uploading Large Archives in Parts Using the High-Level API of the Amazon SDK for Java

You use the same methods of the high-level API to upload small or large archives. Based on the archive size, the high-level API methods decide whether to upload the archive in a single operation or use the multipart upload API provided by S3 Glacier. For more information, see Uploading an Archive Using the High-Level API of the Amazon SDK for Java.

Upload Large Archives in Parts Using the Low-Level API of the Amazon SDK for Java

For granular control of the upload you can use the low-level API where you can configure the request and process the response. The following are the steps to upload large archives in parts using the Amazon SDK for Java.

  1. Create an instance of the AmazonGlacierClient class (the client).

    You need to specify an Amazon Region where you want to save the archive. All operations you perform using this client apply to that Amazon Region.

  2. Initiate multipart upload by calling the initiateMultipartUpload method.

    You need to provide vault name in which you want to upload the archive, part size you want to use to upload archive parts, and an optional description. You provide this information by creating an instance of the InitiateMultipartUploadRequest class. In response, S3 Glacier returns an upload ID.

  3. Upload parts by calling the uploadMultipartPart method.

    For each part you upload, You need to provide the vault name, the byte range in the final assembled archive that will be uploaded in this part, the checksum of the part data, and the upload ID.

  4. Complete multipart upload by calling the completeMultipartUpload method.

    You need to provide the upload ID, the checksum of the entire archive, the archive size (combined size of all parts you uploaded), and the vault name. S3 Glacier constructs the archive from the uploaded parts and returns an archive ID.

Example: Uploading a Large Archive in a Parts Using the Amazon SDK for Java

The following Java code example uses the Amazon SDK for Java to upload an archive to a vault (examplevault). For step-by-step instructions on how to run this example, see Running Java Examples for Amazon S3 Glacier Using Eclipse. You need to update the code as shown with the name of the file you want to upload.


This example is valid for part sizes from 1 MB to 1 GB. However, S3 Glacier supports part sizes up to 4 GB.

import java.io.ByteArrayInputStream; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.security.NoSuchAlgorithmException; import java.util.Arrays; import java.util.Date; import java.util.LinkedList; import java.util.List; import com.amazonaws.AmazonClientException; import com.amazonaws.AmazonServiceException; import com.amazonaws.auth.profile.ProfileCredentialsProvider; import com.amazonaws.services.glacier.AmazonGlacierClient; import com.amazonaws.services.glacier.TreeHashGenerator; import com.amazonaws.services.glacier.model.CompleteMultipartUploadRequest; import com.amazonaws.services.glacier.model.CompleteMultipartUploadResult; import com.amazonaws.services.glacier.model.InitiateMultipartUploadRequest; import com.amazonaws.services.glacier.model.InitiateMultipartUploadResult; import com.amazonaws.services.glacier.model.UploadMultipartPartRequest; import com.amazonaws.services.glacier.model.UploadMultipartPartResult; import com.amazonaws.util.BinaryUtils; public class ArchiveMPU { public static String vaultName = "examplevault"; // This example works for part sizes up to 1 GB. public static String partSize = "1048576"; // 1 MB. public static String archiveFilePath = "*** provide archive file path ***"; public static AmazonGlacierClient client; public static void main(String[] args) throws IOException { ProfileCredentialsProvider credentials = new ProfileCredentialsProvider(); client = new AmazonGlacierClient(credentials); client.setEndpoint("https://glacier.us-west-2.amazonaws.com/"); try { System.out.println("Uploading an archive."); String uploadId = initiateMultipartUpload(); String checksum = uploadParts(uploadId); String archiveId = CompleteMultiPartUpload(uploadId, checksum); System.out.println("Completed an archive. ArchiveId: " + archiveId); } catch (Exception e) { System.err.println(e); } } private static String initiateMultipartUpload() { // Initiate InitiateMultipartUploadRequest request = new InitiateMultipartUploadRequest() .withVaultName(vaultName) .withArchiveDescription("my archive " + (new Date())) .withPartSize(partSize); InitiateMultipartUploadResult result = client.initiateMultipartUpload(request); System.out.println("ArchiveID: " + result.getUploadId()); return result.getUploadId(); } private static String uploadParts(String uploadId) throws AmazonServiceException, NoSuchAlgorithmException, AmazonClientException, IOException { int filePosition = 0; long currentPosition = 0; byte[] buffer = new byte[Integer.valueOf(partSize)]; List<byte[]> binaryChecksums = new LinkedList<byte[]>(); File file = new File(archiveFilePath); FileInputStream fileToUpload = new FileInputStream(file); String contentRange; int read = 0; while (currentPosition < file.length()) { read = fileToUpload.read(buffer, filePosition, buffer.length); if (read == -1) { break; } byte[] bytesRead = Arrays.copyOf(buffer, read); contentRange = String.format("bytes %s-%s/*", currentPosition, currentPosition + read - 1); String checksum = TreeHashGenerator.calculateTreeHash(new ByteArrayInputStream(bytesRead)); byte[] binaryChecksum = BinaryUtils.fromHex(checksum); binaryChecksums.add(binaryChecksum); System.out.println(contentRange); //Upload part. UploadMultipartPartRequest partRequest = new UploadMultipartPartRequest() .withVaultName(vaultName) .withBody(new ByteArrayInputStream(bytesRead)) .withChecksum(checksum) .withRange(contentRange) .withUploadId(uploadId); UploadMultipartPartResult partResult = client.uploadMultipartPart(partRequest); System.out.println("Part uploaded, checksum: " + partResult.getChecksum()); currentPosition = currentPosition + read; } fileToUpload.close(); String checksum = TreeHashGenerator.calculateTreeHash(binaryChecksums); return checksum; } private static String CompleteMultiPartUpload(String uploadId, String checksum) throws NoSuchAlgorithmException, IOException { File file = new File(archiveFilePath); CompleteMultipartUploadRequest compRequest = new CompleteMultipartUploadRequest() .withVaultName(vaultName) .withUploadId(uploadId) .withChecksum(checksum) .withArchiveSize(String.valueOf(file.length())); CompleteMultipartUploadResult compResult = client.completeMultipartUpload(compRequest); return compResult.getLocation(); } }