[英]Batching multiple files to Amazon S3 using the Java SDK
我试图通过附加文件,在同一个密钥下将多个文件上传到Amazon S3。 我有一个文件名列表,并希望按该顺序上传/追加文件。 我几乎完全遵循本教程,但我首先循环遍历每个文件并部分上传。 因为文件在hdfs上(Path实际上是org.apache.hadoop.fs.Path),所以我使用输入流来发送文件数据。 下面是一些伪代码(我正在评论教程中逐字逐句的块):
// Create a list of UploadPartResponse objects. You get one of these for
// each part upload.
List<PartETag> partETags = new ArrayList<PartETag>();
// Step 1: Initialize.
InitiateMultipartUploadRequest initRequest = new InitiateMultipartUploadRequest(
bk.getBucket(), bk.getKey());
InitiateMultipartUploadResult initResponse =
s3Client.initiateMultipartUpload(initRequest);
try {
int i = 1; // part number
for (String file : files) {
Path filePath = new Path(file);
// Get the input stream and content length
long contentLength = fss.get(branch).getFileStatus(filePath).getLen();
InputStream is = fss.get(branch).open(filePath);
long filePosition = 0;
while (filePosition < contentLength) {
// create request
//upload part and add response to our list
i++;
}
}
// Step 3: Complete.
CompleteMultipartUploadRequest compRequest = new
CompleteMultipartUploadRequest(bk.getBucket(),
bk.getKey(),
initResponse.getUploadId(),
partETags);
s3Client.completeMultipartUpload(compRequest);
} catch (Exception e) {
//...
}
但是,我收到以下错误:
com.amazonaws.services.s3.model.AmazonS3Exception: The XML you provided was not well-formed or did not validate against our published schema (Service: Amazon S3; Status Code: 400; Error Code: MalformedXML; Request ID: 2C1126E838F65BB9), S3 Extended Request ID: QmpybmrqepaNtTVxWRM1g2w/fYW+8DPrDwUEK1XeorNKtnUKbnJeVM6qmeNcrPwc
at com.amazonaws.http.AmazonHttpClient.handleErrorResponse(AmazonHttpClient.java:1109)
at com.amazonaws.http.AmazonHttpClient.executeOneRequest(AmazonHttpClient.java:741)
at com.amazonaws.http.AmazonHttpClient.executeHelper(AmazonHttpClient.java:461)
at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:296)
at com.amazonaws.services.s3.AmazonS3Client.invoke(AmazonS3Client.java:3743)
at com.amazonaws.services.s3.AmazonS3Client.completeMultipartUpload(AmazonS3Client.java:2617)
如果有人知道这个错误的原因可能是什么,那将非常感激。 或者,如果有更好的方法将一堆文件连接成一个s3密钥,那也很好。 我尝试使用java的内置SequenceInputStream,但是没有用。 任何帮助将不胜感激。 作为参考,所有文件的总大小可能大到10-15 GB。
我知道这可能有点晚了但值得我做出贡献。 我设法使用SequenceInputStream
解决了类似的问题。
技巧是能够计算结果文件的总大小,然后使用Enumeration<InputStream>
SequenceInputStream
。
以下是一些可能有用的示例代码:
public void combineFiles() {
List<String> files = getFiles();
long totalFileSize = files.stream()
.map(this::getContentLength)
.reduce(0L, (f, s) -> f + s);
try {
try (InputStream partialFile = new SequenceInputStream(getInputStreamEnumeration(files))) {
ObjectMetadata resultFileMetadata = new ObjectMetadata();
resultFileMetadata.setContentLength(totalFileSize);
s3Client.putObject("bucketName", "resultFilePath", partialFile, resultFileMetadata);
}
} catch (IOException e) {
LOG.error("An error occurred while combining files. {}", e);
}
}
private Enumeration<? extends InputStream> getInputStreamEnumeration(List<String> files) {
return new Enumeration<InputStream>() {
private Iterator<String> fileNamesIterator = files.iterator();
@Override
public boolean hasMoreElements() {
return fileNamesIterator.hasNext();
}
@Override
public InputStream nextElement() {
try {
return new FileInputStream(Paths.get(fileNamesIterator.next()).toFile());
} catch (FileNotFoundException e) {
System.err.println(e.getMessage());
throw new RuntimeException(e);
}
}
};
}
希望这可以帮助!
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