How to convert type of any block blob to append blob inside adls gen2? Is there any process or activity which will convert the type of my entire blob without changing the content?

Hi Chakraborty, Nabarun (External),

Thanks for reaching out to Microsoft Q&A.

I have a json file inside a data lake gen2 storage and that json file blob type is a block blob. I want to convert that blob type to append blob through any services of azure. Need to know the process in detail.

Using PowerShell:

Copy the existing block blob to a new location and specify that the destination blob should be a block blob. This process will retain all metadata from the source blob.

Steps:

• Connect-AzAccount command. Set your active subscription to the one containing the storage account with the append or page blobs.
• Create the storage account context using the New-AzStorageContext command.
• Use the Copy-AzStorageBlob command with the -DestBlobType parameter set to Block.
• Specify the source container, source blob name, destination container, destination block blob name, and the desired block blob tier (hot/cool/archive).
• Execute the command to copy the blob.

Using CLI (azcopy):

You can use the azcopy command-line tool to directly convert an existing blob to a block blob. Here’s an example command:

azcopy copy 'https://<storage-account-name>.<blob-or-dfs>.core.windows.net/<container-name>/<append-or-page-blob-name>' 'https://<storage-account-name>.<blob-or-dfs>.core.windows.net/<container-name>/<name-of-new-block-blob>' --blob-type BlockBlob --block-blob-tier <destination-tier>

https://video2.skills-academy.com/en-us/azure/storage/blobs/convert-append-and-page-blobs-to-block-blobs?tabs=azure-powershell

For additional reading...

https://video2.skills-academy.com/en-us/rest/api/storageservices/understanding-block-blobs--append-blobs--and-page-blobs

https://github.com/MicrosoftDocs/azure-docs/blob/main/articles/storage/blobs/storage-blob-append.md

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Hello Chakraborty, Nabarun (External),

Greetings! Welcome to Microsoft Q&A Platform.

As of now, converting block blobs to other blob types (such as append blobs or page blobs) within Azure is not natively supported. Refer this thread for limitations on Block blobs.

The storage service offers three types of blobs, block blobs, append blobs, and page blobs. You specify the blob type when you create the blob. Once the blob has been created, its type cannot be changed, and it can be updated only by using operations appropriate for that blob type, i.e., writing a block or list of blocks to a block blob, appending blocks to an append blob, and writing pages to a page blob.

refer - https://video2.skills-academy.com/en-us/rest/api/storageservices/understanding-block-blobs--append-blobs--and-page-blobs.

Adding to above information, you can convert the append and Page blobs to Block blob by either of the above following methods via Azure PowerShell or Azure CLI or AZ copy.

example code for conversion using Az CLI,

azcopy copy 'https://<storage-account-name>.<blob-or-dfs>.core.windows.net/<container-name>/<append-or-page-blob-name>' 'https://<storage-account-name>.<blob-or-dfs>.core.windows.net/<container-name>/<name-of-new-block-blob>' --blob-type BlockBlob --block-blob-tier <destination-tier>

refer - https://video2.skills-academy.com/en-us/azure/storage/blobs/convert-append-and-page-blobs-to-block-blobs?tabs=azure-powershell for detailed guidance.

Hope this answer helps! Please let us know if you have any further queries. I’m happy to assist you further.

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