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问题:

在Android中合并多个Azure的Cloud块Blob

赵同
2023-03-14

我是Azure Blob云的新手。我基本上想从我的android应用程序上传一个视频文件到Azure cloud,但我不能,因为一旦大小达到32MB,它就会停止,并抛出一个异常作为OutOfMemory。所以我做了一些关于如何解决这个问题的研究,我想出了一个解决方案,将一个文件分解成字节,然后作为多个blob上传。最后,将它们编译成一个blob。但我不知道该怎么做。我试着使用commitBlockList,但我无法获得每个blob的Id。

try {
        // Setup the cloud storage account.
        CloudStorageAccount storageAccount = CloudStorageAccount.parse(storageConnectionString);
        int maxSize = 64 * Constants.MB;

        // Create a blob service client
        CloudBlobClient blobClient = storageAccount.createCloudBlobClient();
        blobClient.getDefaultRequestOptions().setSingleBlobPutThresholdInBytes(maxSize);
        CloudBlobContainer container = blobClient.getContainerReference("testing");
        container.createIfNotExists();
        BlobContainerPermissions containerPermissions = new     BlobContainerPermissions();
        containerPermissions.setPublicAccess(BlobContainerPublicAccessType.CONTAINER);
        container.uploadPermissions(containerPermissions);
        CloudBlockBlob finalFile = container.getBlockBlobReference("1.jpg");
        CloudBlob b = container.getBlockBlobReference("temp");
        String Lease = b.getSnapshotID();
        b.uploadFromFile(URL);
        List<BlockEntry> blockEntryIterator = new ArrayList<>();
        blockEntryIterator.add(new BlockEntry(Lease));
        finalFile.commitBlockList(blockEntryIterator);
    } catch (Throwable t) {

    }

更新~~~

我试图将文件拆分为多个部分,但现在出现了这样一个错误:“指定的blob或block内容无效”。public void splitTest(字符串URL)抛出IOException、URISyntaxException、InvalidKeyException、StorageException{

    new ConversionNotificationSetup().sendNotification(a.getApplicationContext(),"STARTED");
    CloudBlockBlob blob = null;
    List<BlockEntry> blockList = null;
    try{
        // get file reference
        FileInputStream fs = new FileInputStream( URL );
        File sourceFile = new File( URL);

        // set counters
        long fileSize = sourceFile.length();
        int blockSize = 3 * (1024 * 1024); // 256K
        int blockCount = (int)((float)fileSize / (float)blockSize) + 1;
        long bytesLeft = fileSize;
        int blockNumber = 0;
        long bytesRead = 0;

        CloudStorageAccount storageAccount = CloudStorageAccount.parse(storageConnectionString);
        CloudBlobClient blobClient = storageAccount.createCloudBlobClient();
        CloudBlobContainer container = blobClient.getContainerReference("testing");
        String title = "Android_" + getFileNameFromUrl(URL);
        // get ref to the blob we are creating while uploading
        blob = container.getBlockBlobReference(title);
        blob.deleteIfExists();

        // list of all block ids we will be uploading - need it for the commit at the end
        blockList = new ArrayList<BlockEntry>();

        // loop through the file and upload chunks of the file to the blob
        while( bytesLeft > 0 ) {

            blockNumber++;
            // how much to read (only last chunk may be smaller)
            int bytesToRead = 0;
            if ( bytesLeft >= (long)blockSize ) {
                bytesToRead = blockSize;
            } else {
                bytesToRead = (int)bytesLeft;
            }

            // trace out progress
            float pctDone = ((float)blockNumber / (float)blockCount) * (float)100;


            // save block id in array (must be base64)
            String x = "";
            if(blockNumber<=9) {
                traceLine( "blockid: 000" + blockNumber + ". " + String.format("%.0f%%",pctDone) + " done.");
                x = "blockid000" + blockNumber;
            }
            else if(blockNumber>=10 && blockNumber<=99){
                traceLine( "blockid: 00" + blockNumber + ". " + String.format("%.0f%%",pctDone) + " done.");
                x = "blockid00" + blockNumber;
            }
            else if(blockNumber>=100 && blockNumber<=999){
                traceLine( "blockid0: " + blockNumber + ". " + String.format("%.0f%%",pctDone) + " done.");
                x = "blockid0" + blockNumber;
            }
            else if(blockNumber>=1000 && blockNumber<=9999){
                traceLine( "blockid: " + blockNumber + ". " + String.format("%.0f%%",pctDone) + " done.");
                x = "blockid" + blockNumber;
            }
            String blockId = Base64.encodeToString(x.getBytes(),Base64.DEFAULT).replace("\n","").toLowerCase();
            traceLine( "Base 64["+x+"] -> " + blockId);
            BlockEntry block = new BlockEntry(blockId);
            blockList.add(block);

            // upload block chunk to Azure Storage
            blob.uploadBlock( blockId, fs, (long)bytesToRead);

            // increment/decrement counters
            bytesRead += bytesToRead;
            bytesLeft -= bytesToRead;

        }
        fs.close();
        traceLine( "CommitBlockList. BytesUploaded: " + bytesRead);
        blob.commitBlockList(blockList);
        new ConversionNotificationSetup().sendNotification(a.getApplicationContext(),"UPLOAD COMPLETE");
        return;
    }
    catch (StorageException storageException) {
        traceLine("StorageException encountered: ");
        traceLine(storageException.getMessage());
        new ConversionNotificationSetup().sendNotification(a.getApplicationContext(),"FAILED");
        assert blockList != null;
        blob.commitBlockList(blockList);
        return;
    } catch( IOException ex ) {
        traceLine( "IOException: " + ex );
        new ConversionNotificationSetup().sendNotification(a.getApplicationContext(),"FAILED");
        assert blockList != null;
        blob.commitBlockList(blockList);
        return;
    } catch (Exception e) {
        traceLine("Exception encountered: ");
        traceLine(e.getMessage());
        new ConversionNotificationSetup().sendNotification(a.getApplicationContext(),"FAILED");
        assert blockList != null;
        blob.commitBlockList(blockList);
        return;
    }
}

~~~工作更新~~~

对于任何想重复使用此方法打开文件的人

public boolean splitTest(String URL) throws IOException, URISyntaxException, InvalidKeyException, StorageException {
    new ConversionNotificationSetup().sendNotification(a.getApplicationContext(),"STARTED");
    CloudBlockBlob blob = null;
    List<BlockEntry> blockList = null;
    try{
        // get file reference
        FileInputStream fs = new FileInputStream(URL);
        File sourceFile = new File(URL);

        // set counters
        long fileSize = sourceFile.length();
        int blockSize = 512 * 1024; // 256K
        //int blockSize = 1 * (1024 * 1024); // 256K
        int blockCount = (int)((float)fileSize / (float)blockSize) + 1;
        long bytesLeft = fileSize;
        int blockNumber = 0;
        long bytesRead = 0;

        CloudStorageAccount storageAccount = CloudStorageAccount.parse(storageConnectionString);
        CloudBlobClient blobClient = storageAccount.createCloudBlobClient();
        CloudBlobContainer container = blobClient.getContainerReference("testing");
        String title = "Android/Android_" + getFileNameFromUrl(URL).replace("\n","").replace(" ","_").replace("-","").toLowerCase();
        // get ref to the blob we are creating while uploading
        blob = container.getBlockBlobReference(title);
        traceLine("Title of blob -> " + title);

        if(blob.exists())
            blob.deleteIfExists();

        blob.setStreamWriteSizeInBytes(blockSize);
        // list of all block ids we will be uploading - need it for the commit at the end
        blockList = new ArrayList<>();

        // loop through the file and upload chunks of the file to the blob
        while( bytesLeft > 0 ) {
            // how much to read (only last chunk may be smaller)
            int bytesToRead = 0;
            if ( bytesLeft >= (long)blockSize ) {
                bytesToRead = blockSize;
            } else {
                bytesToRead = (int)bytesLeft;
            }

            // trace out progress
            float pctDone = ((float)blockNumber / (float)blockCount) * (float)100;


            // save block id in array (must be base64)
            String x = "";
            if(blockNumber<=9) {
                traceLine( "tempblobid0000" + blockNumber + ". " + String.format("%.0f%%",pctDone) + " done.");
                x = "tempblobid0000" + blockNumber;
            }
            else if(blockNumber>=10 && blockNumber<=99){
                traceLine( "tempblobid000" + blockNumber + ". " + String.format("%.0f%%",pctDone) + " done.");
                x = "tempblobid000" + blockNumber;
            }
            else if(blockNumber>=100 && blockNumber<=999){
                traceLine( "tempblobid00" + blockNumber + ". " + String.format("%.0f%%",pctDone) + " done.");
                x = "tempblobid00" + blockNumber;
            }
            else if(blockNumber>=1000 && blockNumber<=9999){
                traceLine( "tempblobid0" + blockNumber + ". " + String.format("%.0f%%",pctDone) + " done.");
                x = "tempblobid0" + blockNumber;
            }
            else if(blockNumber>=10000 && blockNumber<=99999){
                traceLine( "tempblobid" + blockNumber + ". " + String.format("%.0f%%",pctDone) + " done.");
                x = "tempblobid" + blockNumber;
            }
            String blockId = Base64.encodeToString(x.getBytes(),Base64.NO_WRAP).replace("\n","").toLowerCase();
            traceLine( "Base 64["+ x +"] -> " + blockId);
            BlockEntry block = new BlockEntry(blockId);
            blockList.add(block);
            // upload block chunk to Azure Storage
            blob.uploadBlock( blockId, fs, (long)bytesToRead);
            notification2(a,pctDone);
            //a.update(pctDone);
            // increment/decrement counters
            bytesRead += bytesToRead;
            bytesLeft -= bytesToRead;
            blockNumber++;
        }
        fs.close();
        traceLine( "CommitBlockList. BytesUploaded: " + bytesRead + "\t total bytes -> " + fileSize + "\tBytes Left -> " + bytesLeft);
        blob.commitBlockList(blockList);
        new ConversionNotificationSetup().sendNotification(a.getApplicationContext(),"UPLOAD COMPLETE");
        return true;
    }
    catch (StorageException storageException) {
        traceLine("StorageException encountered: ");
        traceLine(storageException.getMessage());
        traceLine("HTTP Status code -> " + storageException.getHttpStatusCode());
        new ConversionNotificationSetup().sendNotification(a.getApplicationContext(),"FAILED");
        if (blob != null) {
            blob.commitBlockList(blockList);
        }
        return false;
    } catch( IOException ex ) {
        traceLine( "IOException: " + ex );
        new ConversionNotificationSetup().sendNotification(a.getApplicationContext(),"FAILED");
        if (blob != null) {
            blob.commitBlockList(blockList);
        }
        return false;
    } catch (Exception e) {
        traceLine("Exception encountered: ");
        traceLine(e.getMessage());
        new ConversionNotificationSetup().sendNotification(a.getApplicationContext(),"FAILED");
        if (blob != null) {
            blob.commitBlockList(blockList);
        }
        return false;
    }

}

共有1个答案

邵城
2023-03-14

这取决于你使用的是哪种手机。如果你的内存不足32MB,你就只能在一部非常小的手机上使用,或者使用很多其他进程。看看你的手机,看看你有多少可用内存,像Gaurav提到的和我的其他回答提到的,把门槛降低到那个水平。自欺欺人对你想做的事没有帮助。

您要查看的两个设置是blob本身上的singleBlobPutThresholdInBytes和setStreamWriteSizeInBytes。singleBlobPutThresholdInBytes影响开始分块的时间,而setStreamWriteSizeInBytes则影响发生分块时块的大小。put阈值默认为64MB,写入大小默认为4MB。请注意,如果减少写入大小,可能无法获得最大块blob大小,因为块blob被限制为50k块。尝试将singleBlobPutThreshold减少到4MB之前可以处理的内存量——如果小于4MB,那么您就真的有麻烦了,还需要减少流写入大小。

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