Download Large File From S3 Bucket Java

[Cameron Carrion]

Is there any limitation for Java callout in Apigee (like number of jar file or size of jar etc). I am developing proxy to write data to AWS S3 bucket using java callout. However, sometime when I try to deploy getting following error -

download large file from s3 bucket java

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The utility automatically retrieves messages which have been offloaded to S3 using theamazon-sqs-java-extended-client-libclient library. Once the message payloads have been processed successful theutility can delete the message payloads from S3.

When the Lambda function is invoked with an event from SQS, each received recordin the SQSEvent is checked to see to validate if it is offloaded to S3.If it does then getObject(bucket, key) will be called, and the payload retrieved.If there is an error during this process then the function will fail with a FailedProcessingLargePayloadExceptionexception.

Importing (reading) a large file leads Out of Memory error. It can also lead to a system crash event. There are libraries viz. Pandas, Dask, etc. which are very good at processing large files but again the file is to be present locally i.e. we will have to import it from S3 to our local machine. But what if we do not want to fetch and store the whole S3 file locally? ?

Scanner is a class in java.util package used for obtaining the input of the primitive types like int, double, etc. and strings. It is the easiest way to read input in a Java program, though not very efficient if you want an input method for scenarios where time is a constraint like in competitive programming. Scanner class is used to read the large file line by line. A Scanner breaks its input into tokens, which by default matches the whitespace.

The Dev status plugin has a guaranteed delivery feature, so in case Jira does not receive an update from Bitbucket and / or Fisheye for some time, Jira reaches out to Bitbucket and / or Fisheye and requests an update, to which Bitbucket and / or Fisheye replies with a list of issues that should be modified. Then, Jira reaches out again to seek all of the updates (which is what is failing in this case).

The SDK will create a new file if the provided one doesn't exist. The default permission for the new file depends on the file system and platform. Users can configure the permission on the file using Java API by themselves. If the file already exists, the SDK will replace it. In the event of an error, the SDK will NOT attempt to delete the file, leaving it as-is. Users can monitor the progress of the transfer by attaching a TransferListener. The provided LoggingTransferListener logs a basic progress bar; users can also implement their own listeners. Usage Example: Copy S3TransferManager transferManager = S3TransferManager.create(); DownloadFileRequest downloadFileRequest = DownloadFileRequest.builder() .getObjectRequest(req -> req.bucket("bucket").key("key")) .destination(Paths.get("myFile.txt")) .addTransferListener(LoggingTransferListener.create()) .build(); FileDownload download = transferManager.downloadFile(downloadFileRequest); // Wait for the transfer to complete download.completionFuture().join();See Also:

• downloadFile(Consumer)
• download(DownloadRequest)
• downloadFiledefault FileDownload downloadFile(Consumer request)This is a convenience method that creates an instance of the DownloadFileRequest builder, avoiding the need to create one manually via DownloadFileRequest.builder().See Also:
• downloadFile(DownloadFileRequest)
• resumeDownloadFiledefault FileDownload resumeDownloadFile(ResumableFileDownload resumableFileDownload)Resumes a downloadFile operation. This download operation uses the same configuration as the original download. Any content that has already been fetched since the last pause will be skipped and only the remaining data will be downloaded from Amazon S3. If it is determined that the source S3 object or the destination file has be modified since the last pause, the SDK will download the object from the beginning as if it is a new DownloadFileRequest. Usage Example: Copy S3TransferManager transferManager = S3TransferManager.create(); DownloadFileRequest downloadFileRequest = DownloadFileRequest.builder() .getObjectRequest(req -> req.bucket("bucket").key ("key")) .destination(Paths.get("myFile.txt")) .build(); // Initiate the transfer FileDownload download = transferManager.downloadFile(downloadFileRequest); // Pause the download ResumableFileDownload resumableFileDownload = download.pause(); // Optionally, persist the download object Path path = Paths.get("resumableFileDownload.json"); resumableFileDownload.serializeToFile(path); // Retrieve the resumableFileDownload from the file resumableFileDownload = ResumableFileDownload.fromFile(path); // Resume the download FileDownload resumedDownload = transferManager.resumeDownloadFile(resumableFileDownload); // Wait for the transfer to complete resumedDownload.completionFuture().join();Parameters:resumableFileDownload - the download to resume.Returns:A new FileDownload object to use to check the state of the download.See Also:
• downloadFile(DownloadFileRequest)
• FileDownload.pause()
• resumeDownloadFiledefault FileDownload resumeDownloadFile(Consumer resumableFileDownload)This is a convenience method that creates an instance of the ResumableFileDownload builder, avoiding the need to create one manually via ResumableFileDownload.builder().See Also:
• resumeDownloadFile(ResumableFileDownload)
• downloaddefault Download download(DownloadRequest downloadRequest)Downloads an object identified by the bucket and key from S3 through the given AsyncResponseTransformer. For downloading to a file, you may use downloadFile(DownloadFileRequest) instead. Users can monitor the progress of the transfer by attaching a TransferListener. The provided LoggingTransferListener logs a basic progress bar; users can also implement their own listeners. Usage Example (this example buffers the entire object in memory and is not suitable for large objects): Copy S3TransferManager transferManager = S3TransferManager.create(); DownloadRequest downloadRequest = DownloadRequest.builder() .getObjectRequest(req -> req.bucket("bucket").key("key")) .responseTransformer(AsyncResponseTransformer.toBytes()) .build(); // Initiate the transfer Download download = transferManager.download(downloadRequest); // Wait for the transfer to complete download.completionFuture().join(); See the static factory methods available in AsyncResponseTransformer for other use cases.Type Parameters:ResultT - The type of data the AsyncResponseTransformer producesParameters:downloadRequest - the download request, containing a GetObjectRequest and AsyncResponseTransformerReturns:A Download that can be used to track the ongoing transferSee Also:
• downloadFile(DownloadFileRequest)
• uploadFiledefault FileUpload uploadFile(UploadFileRequest uploadFileRequest)Uploads a local file to an object in S3. For non-file-based uploads, you may use upload(UploadRequest) instead. Users can monitor the progress of the transfer by attaching a TransferListener. The provided LoggingTransferListener logs a basic progress bar; users can also implement their own listeners. Upload a local file to an object in S3. For non-file-based uploads, you may use upload(UploadRequest) instead. Usage Example: Copy S3TransferManager transferManager = S3TransferManager.create(); UploadFileRequest uploadFileRequest = UploadFileRequest.builder() .putObjectRequest(req -> req.bucket("bucket").key("key")) .addTransferListener(LoggingTransferListener.create()) .source(Paths.get("myFile.txt")) .build(); FileUpload upload = transferManager.uploadFile(uploadFileRequest); upload.completionFuture().join();See Also:
• uploadFile(Consumer)
• upload(UploadRequest)
• uploadFiledefault FileUpload uploadFile(Consumer request)This is a convenience method that creates an instance of the UploadFileRequest builder, avoiding the need to create one manually via UploadFileRequest.builder().See Also:
• uploadFile(UploadFileRequest)
• resumeUploadFiledefault FileUpload resumeUploadFile(ResumableFileUpload resumableFileUpload)Resumes uploadFile operation. This upload operation will use the same configuration provided in ResumableFileUpload. The SDK will skip the data that has already been upload since the last pause and only upload the remaining data from the source file. If it is determined that the source file has be modified since the last pause, the SDK will upload the object from the beginning as if it is a new UploadFileRequest. Usage Example: Copy S3TransferManager transferManager = S3TransferManager.create(); UploadFileRequest uploadFileRequest = UploadFileRequest.builder() .putObjectRequest(req -> req.bucket("bucket").key("key")) .source(Paths.get("myFile.txt")) .build(); // Initiate the transfer FileUpload upload = transferManager.uploadFile(uploadFileRequest); // Pause the upload ResumableFileUpload resumableFileUpload = upload.pause(); // Optionally, persist the resumableFileUpload Path path = Paths.get("resumableFileUpload.json"); resumableFileUpload.serializeToFile(path); // Retrieve the resumableFileUpload from the file ResumableFileUpload persistedResumableFileUpload = ResumableFileUpload.fromFile(path); // Resume the upload FileUpload resumedUpload = transferManager.resumeUploadFile(persistedResumableFileUpload); // Wait for the transfer to complete resumedUpload.completionFuture().join();Parameters:resumableFileUpload - the upload to resume.Returns:A new FileUpload object to use to check the state of the download.See Also:
• uploadFile(UploadFileRequest)
• FileUpload.pause()
• resumeUploadFiledefault FileUpload resumeUploadFile(Consumer resumableFileUpload)This is a convenience method that creates an instance of the ResumableFileUpload builder, avoiding the need to create one manually via ResumableFileUpload.builder().See Also:
• resumeUploadFile(ResumableFileUpload)
• uploaddefault Upload upload(UploadRequest uploadRequest)Uploads the given AsyncRequestBody to an object in S3. For file-based uploads, you may use uploadFile(UploadFileRequest) instead. Users can monitor the progress of the transfer by attaching a TransferListener. The provided LoggingTransferListener logs a basic progress bar; users can also implement their own listeners. Usage Example: Copy S3TransferManager transferManager = S3TransferManager.create(); UploadRequest uploadRequest = UploadRequest.builder() .requestBody(AsyncRequestBody.fromString("Hello world")) .putObjectRequest(req -> req.bucket("bucket").key("key")) .build(); Upload upload = transferManager.upload(uploadRequest); // Wait for the transfer to complete upload.completionFuture().join(); See the static factory methods available in AsyncRequestBody for other use cases.Parameters:uploadRequest - the upload request, containing a PutObjectRequest and AsyncRequestBodyReturns:An Upload that can be used to track the ongoing transferSee Also:
• upload(Consumer)
• uploadFile(UploadFileRequest)
• uploaddefault Upload upload(Consumer request)This is a convenience method that creates an instance of the UploadRequest builder, avoiding the need to create one manually via UploadRequest.builder().See Also:
• upload(UploadRequest)
• uploadDirectorydefault DirectoryUpload uploadDirectory(UploadDirectoryRequest uploadDirectoryRequest)Uploads all files under the given directory to the provided S3 bucket. The key name transformation depends on the optional prefix and delimiter provided in the UploadDirectoryRequest. By default, all subdirectories will be uploaded recursively, and symbolic links are not followed automatically. This behavior can be configured in at request level via UploadDirectoryRequest.Builder.followSymbolicLinks(Boolean) or client level via S3TransferManager.Builder.uploadDirectoryFollowSymbolicLinks(Boolean) Note that request-level configuration takes precedence over client-level configuration. By default, the prefix is an empty string and the delimiter is "/". Assume you have a local directory "/test" with the following structure: - test - sample.jpg - photos - 2022 - January - sample.jpg - February - sample1.jpg - sample2.jpg - sample3.jpg Give a request to upload directory "/test" to an S3 bucket, the target bucket will have the following S3 objects:
  • sample.jpg
  • photos/2022/January/sample.jpg
  • photos/2022/February/sample1.jpg
  • photos/2022/February/sample2.jpg
  • photos/2022/February/sample3.jpg
  The returned CompletableFuture only completes exceptionally if the request cannot be attempted as a whole (the source directory provided does not exist for example). The future completes successfully for partial successful requests, i.e., there might be failed uploads in the successfully completed response. As a result, you should check for errors in the response via CompletedDirectoryUpload.failedTransfers() even when the future completes successfully. The current user must have read access to all directories and files. Usage Example: Copy S3TransferManager transferManager = S3TransferManager.create(); DirectoryUpload directoryUpload = transferManager.uploadDirectory(UploadDirectoryRequest.builder() .source(Paths.get("source/directory")) .bucket("bucket") .s3Prefix("prefix") .build()); // Wait for the transfer to complete CompletedDirectoryUpload completedDirectoryUpload = directoryUpload.completionFuture().join(); // Print out any failed uploads completedDirectoryUpload.failedTransfers().forEach(System.out::println);Parameters:uploadDirectoryRequest - the upload directory requestSee Also:
• uploadDirectory(Consumer)
• uploadDirectorydefault DirectoryUpload uploadDirectory(Consumer requestBuilder)This is a convenience method that creates an instance of the UploadDirectoryRequest builder, avoiding the need to create one manually via UploadDirectoryRequest.builder().See Also:
• uploadDirectory(UploadDirectoryRequest)
• downloadDirectorydefault DirectoryDownload downloadDirectory(DownloadDirectoryRequest downloadDirectoryRequest)Downloads all objects under a bucket to the provided directory. By default, all objects in the entire bucket will be downloaded. You can modify this behavior by providing a DownloadDirectoryRequest.listObjectsRequestTransformer() and/or a DownloadDirectoryRequest.filter() in DownloadDirectoryRequest to limit the S3 objects to download. The downloaded directory structure will match with the provided S3 virtual bucket. For example, assume that you have the following keys in your bucket:
  • sample.jpg
  • photos/2022/January/sample.jpg
  • photos/2022/February/sample1.jpg
  • photos/2022/February/sample2.jpg
  • photos/2022/February/sample3.jpg
  Give a request to download the bucket to a destination with path of "/test", the downloaded directory would look like this - test - sample.jpg - photos - 2022 - January - sample.jpg - February - sample1.jpg - sample2.jpg - sample3.jpg The returned CompletableFuture only completes exceptionally if the request cannot be attempted as a whole (the downloadDirectoryRequest is invalid for example). The future completes successfully for partial successful requests, i.e., there might be failed downloads in a successfully completed response. As a result, you should check for errors in the response via CompletedDirectoryDownload.failedTransfers() even when the future completes successfully. The SDK will create the destination directory if it does not already exist. If a specific file already exists, the existing content will be replaced with the corresponding S3 object content. The current user must have write access to all directories and files Usage Example: Copy S3TransferManager transferManager = S3TransferManager.create(); DirectoryDownload directoryDownload = transferManager.downloadDirectory( DownloadDirectoryRequest.builder() .destination(Paths.get("destination/directory")) .bucket("bucket") // only download objects with prefix "photos" .listObjectsV2RequestTransformer(l -> l.prefix("photos")) .build()); // Wait for the transfer to complete CompletedDirectoryDownload completedDirectoryDownload = directoryDownload.completionFuture().join(); // Print out any failed downloads completedDirectoryDownload.failedTransfers().forEach(System.out::println);Parameters:downloadDirectoryRequest - the download directory requestSee Also:
• downloadDirectory(Consumer)
• downloadDirectorydefault DirectoryDownload downloadDirectory(Consumer requestBuilder)This is a convenience method that creates an instance of the DownloadDirectoryRequest builder, avoiding the need to create one manually via DownloadDirectoryRequest.builder().See Also:
• downloadDirectory(DownloadDirectoryRequest)
• copydefault Copy copy(CopyRequest copyRequest)Creates a copy of an object that is already stored in S3. Depending on the underlying S3Client, S3TransferManager may intelligently use plain CopyObjectRequests for smaller objects, and multiple parallel UploadPartCopyRequests for larger objects. If multipart copy is supported by the underlying S3Client, this behavior can be configured via S3CrtAsyncClientBuilder.minimumPartSizeInBytes(Long). Note that for multipart copy request, existing metadata stored in the source object is NOT copied to the destination object; if required, you can retrieve the metadata from the source object and set it explicitly in the @link CopyObjectRequest.Builder#metadata(Map)}. While this API supports TransferListeners, they will not receive bytesTransferred callback-updates due to the way the CopyObjectRequest API behaves. When copying an object, S3 performs the byte copying on your behalf while keeping the connection alive. The progress of the copy is not known until it fully completes and S3 sends a response describing the outcome. If you are copying an object to a bucket in a different region, you need to enable cross region access on the S3AsyncClient. Usage Example: Copy S3AsyncClient s3AsyncClient = S3AsyncClient.crtBuilder() // enable cross-region access, only required if you are making cross-region copy .crossRegionAccessEnabled(true) .build(); S3TransferManager transferManager = S3TransferManager.builder() .s3Client(s3AsyncClient) .build(); CopyObjectRequest copyObjectRequest = CopyObjectRequest.builder() .sourceBucket("source_bucket") .sourceKey("source_key") .destinationBucket("dest_bucket") .destinationKey("dest_key") .build(); CopyRequest copyRequest = CopyRequest.builder() .copyObjectRequest(copyObjectRequest) .build(); Copy copy = transferManager.copy(copyRequest); // Wait for the transfer to complete CompletedCopy completedCopy = copy.completionFuture().join();Parameters:copyRequest - the copy request, containing a CopyObjectRequestReturns:A Copy that can be used to track the ongoing transferSee Also:
• copy(Consumer)
• S3AsyncClient.copyObject(CopyObjectRequest)
• copydefault Copy copy(Consumer copyRequestBuilder)This is a convenience method that creates an instance of the CopyRequest builder, avoiding the need to create one manually via CopyRequest.builder().See Also:
• copy(CopyRequest)
• createstatic S3TransferManager create()Create an S3TransferManager using the default values. The type of S3AsyncClient used depends on if AWS Common Runtime (CRT) library software.amazon.awssdk.crt:aws-crt is in the classpath. If AWS CRT is available, an AWS CRT-based S3 client will be created via (S3AsyncClient.crtCreate()). Otherwise, a standard S3 client(S3AsyncClient.create()) will be created. Note that only AWS CRT-based S3 client supports parallel transfer, i.e, leveraging multipart upload/download for now, so it's recommended to add AWS CRT as a dependency.
• builderstatic S3TransferManager.Builder builder()Creates a default builder for S3TransferManager.

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