Azure Archive tier overwrite files [Java]

When a blob is in the Archive tier, it is set to be offline and cannot be read or modified. Hence, you cannot overwrite a blob which is in the Archive tier.

To overwrite a blob, you have to make sure the blob is online and isn't set to Archive.

This can be achieved using Rehydration in two ways:

Method 1:

• Copy the archived blob to a new destination blob that is in either the Hot or Cool tier using the Copy Blob operation .
• When you copy an archived blob to a new blob in an online tier, the source blob remains unmodified in the Archive tier.
• Once you have copied the blob to an online tier, you can then overwrite it as needed.

Method 2:

• Changing the Blob's tier from archive to hot or cool with the Set Blob Tier operation.

I have a Blob in Archive tier:

• To Rehydrate the Archive tier Blob, I've used the below code snippet taken from SO by @Venkatesan:

String sourceConnectionString = "<Source_storage_Connection_string>";
        String destConnectionString = "<destination_storage_connection_string>";
        String sourceContainerName = "<source_container_name>";//demo
        String destContainerName = "<destination_container_name>";//demo
        String sourceBlobName = "<your_source_blob_name>";//demoblob/Blob.txt
        String destBlobName = "<destination>";//demo.txt
        
        BlobClient sourceBlobClient = new BlobServiceClientBuilder().connectionString(sourceConnectionString)
                .buildClient().getBlobContainerClient(sourceContainerName).getBlobClient(sourceBlobName);
        BlobClient destBlobClient = new BlobServiceClientBuilder().connectionString(destConnectionString)
                .buildClient().getBlobContainerClient(destContainerName).getBlobClient(destBlobName);
        
        // Generating SAS token
        OffsetDateTime sasExpiry = OffsetDateTime.now().plusMinutes(1);
        BlobSasPermission permission = new BlobSasPermission().setReadPermission(true);
        BlobServiceSasSignatureValues sas = new BlobServiceSasSignatureValues(sasExpiry, permission);
        String sourceURL = sourceBlobClient.getBlobUrl() + "?" + sourceBlobClient.generateSas(sas);
        

        Map<String, String> metadata = new HashMap<>();
        metadata.put("key", "value");
        
        // Performing blob copy with rehydration
        destBlobClient.beginCopy(sourceURL, metadata, AccessTier.COOL, RehydratePriority.HIGH, null, null, null);
        
        System.out.println("Blob copy operation is initiated with rehydration.");

Output:

• A copy of the Blob created with Cool tier:

• You can overwrite the newly generated Blob with cool tier.

References:

Blob rehydration from the archive tier | Microsoft Learn Rehydrate an archived blob to an online tier - Azure Storage | Microsoft Learn