Exam AZ-204 topic 3 question 1 discussion

I think the answer is correct: Optional. Version 2012-02-12 and newer. For a break operation, this is the proposed duration of seconds that the lease should continue before it is broken, between 0 and 60 seconds. This break period is only used if it is shorter than the time remaining on the lease. If longer, the time remaining on the lease is used. A new lease will not be available before the break period has expired, but the lease may be held for longer than the break period. If this header does not appear with a break operation, a fixed-duration lease breaks after the remaining lease period elapses, and an infinite lease breaks immediately. From: https://docs.microsoft.com/en-us/rest/api/storageservices/lease-blob

I think Box 3 should be no insetad of yes. BreakRelease don`t release the lease directly. You use ReleaseLease to do this: https://docs.microsoft.com/en-us/dotnet/api/microsoft.azure.storage.blob.cloudblobcontainer.releaselease?view=azure-dotnet-legacy

correct . yes no yes - acquire leaseasync(null)--> infinite , On line 6 it gets a reference to a block blob in this container. A lease is a lock on a blob or file for write and delete operations12. The lock duration can be 15 to 60 seconds, or can be infinite

The code creates an infinite lease: The AcquireLeaseAsync method is called with null as the parameter, which does not create an infinite lease. To create an infinite lease, it should be called with -1. Answer: No The code at line 06 always creates a new blob: Line 06 (var dst = container.GetBlockBlobReference(src.Name);) gets a reference to an existing blob with the same name as src. It does not create a new blob but rather references an existing one. Answer: No The finally block releases the lease: The finally block contains await src.BreakLeaseAsync(new TimeSpan(0));, which releases the lease on the blob. Answer: Yes Thanks for pointing that out! Is there anything else you’d like to discuss or clarify?

Lease Duration: No, the code does not create an infinite lease. The lease acquired at line 5 (await src.AcquireLeaseAsync(null)) does not specify a duration (the null argument). By default, this results in a finite lease. If you want to create an infinite lease, you can provide a non-null TimeSpan argument to AcquireLeaseAsync, specifying the desired lease duration. Creating a New Blob: No, the code at line 6 (var dst = container.GetBlockBlobReference(src.Name);) does not always create a new blob. Instead, it creates a new CloudBlockBlob reference named dst that points to the same blob as src. Essentially, dst refers to the blob with the same name as src. Releasing the Lease: Yes, the final code ensures that the lease is released. In the finally block (lines 15-25), it checks if src is not null: Fetches attributes of src. If the lease state of src is not available (meaning it’s still leased), it breaks the lease using src.BreakLeaseAsync(new TimeSpan(0)).

Finally block doesn't release the lease. Is nobody else able to see the if above the BreakLeaseAsync?

Answer is Correct. BlobLease.BreakLeaseAsync: If the break period is not specified, the default value is 0 (immediate break).

I think the answer is correct

So, when you provide a TimeSpan value of 0, it essentially means "break the lease right now without any delay." This behavior aligns with the statement you provided: "If null, the break period is the remainder of the current lease, or zero for infinite leases." When you explicitly set it to 0, it ensures an immediate lease termination. It is a matter of knowing the English Language.

to break the lease it will have to enter in the if block ..and since the lease ¡state will be always be available since it is infinite ...it will never enter that block...so the answer is no

Yes, No, Yes

version 11 is legacy. Similar code for version 12 see https://learn.microsoft.com/en-us/azure/storage/blobs/storage-blob-copy?tabs=dotnet

This is Microsoft.Azure.Storage.Blob v11.1.0 code, it is a legacy library. Did anyone got this on the exam recently?

i'm looking for an explanation on what a "lease" is, or what is intended by it, and cannot find any explanatory resource. Does anyone have a reference to it ?

Correct answer: YES NO YES

If the finally code releases the lease, then 1st is wrong. The code doesn't create an infinite lease. Answer is NO.

Tried to execute the code sample: 1) If acquires lease on the blob with null parameter, means the infinite lease is acquired [1] 2) On line 6 it gets reference to existing source blob, so no new blob is created there 3) It fails on start copy operation, because it tries to copy onto itself and the lease is already acquired 4) Goes to catch and then finally block 5) In finally breaks the lease with (Zero) parameter that means the immediate lease break [2] [1] https://docs.microsoft.com/en-us/dotnet/api/microsoft.azure.storage.blob.cloudblobcontainer.acquireleaseasync?view=azure-dotnet-legacy#microsoft-azure-storage-blob-cloudblobcontainer-acquireleaseasync(system-nullable((system-timespan))-system-string) [2] https://docs.microsoft.com/en-us/dotnet/api/microsoft.azure.storage.blob.cloudblobcontainer.breakleaseasync?view=azure-dotnet-legacy#microsoft-azure-storage-blob-cloudblobcontainer-breakleaseasync(system-nullable((system-timespan)))