gRPC 5 NOT_FOUND vs 9 FAILED_PRECONDITION
Both gRPC 5 (NOT_FOUND) and 9 (FAILED_PRECONDITION) belong to the gRPC Status Codes category. 5 indicates that some requested entity was not found. For example, a file or directory that the RPC was supposed to operate on does not exist. Meanwhile, 9 means that the operation was rejected because the system is not in a state required for the operation's execution. For example, deleting a non-empty directory.
Mô tả
Some requested entity was not found. For example, a file or directory that the RPC was supposed to operate on does not exist.
Khi bạn thấy mã này
The resource referenced in the request doesn't exist — such as looking up a user by ID that has been deleted or never created.
Cách khắc phục
Verify the resource identifier is correct. Ensure the resource was created before accessing it, or handle the not-found case gracefully in your client.
Mô tả
The operation was rejected because the system is not in a state required for the operation's execution. For example, deleting a non-empty directory.
Khi bạn thấy mã này
The request is valid on its own, but the system's current state doesn't allow it — like trying to delete a non-empty directory or update a resource that has been modified concurrently.
Cách khắc phục
Bring the system into the required state before retrying. For example, empty the directory first, or re-read the resource to get the latest version before updating.
Sự khác biệt chính
gRPC 5: Some requested entity was not found. For example, a file or directory that the RPC was supposed to operate on does not exist.
gRPC 9: The operation was rejected because the system is not in a state required for the operation's execution. For example, deleting a non-empty directory.
You encounter 5 when the resource referenced in the request doesn't exist — such as looking up a user by ID that has been deleted or never created.
You encounter 9 when the request is valid on its own, but the system's current state doesn't allow it — like trying to delete a non-empty directory or update a resource that has been modified concurrently.
Khi nào dùng cái nào
For 5 (NOT_FOUND): Verify the resource identifier is correct. Ensure the resource was created before accessing it, or handle the not-found case gracefully in your client. For 9 (FAILED_PRECONDITION): Bring the system into the required state before retrying. For example, empty the directory first, or re-read the resource to get the latest version before updating.