Re: Preserving transactions accross Xenstored Live-Update

[Juergen Gross <jgross@xxxxxxxx>]

On 18.05.21 20:11, Julien Grall wrote:
> Hi Juergen,
>
> I have started to look at preserving transaction accross Live-update in 
> C Xenstored. So far, I managed to transfer transaction that read/write 
> existing nodes.
> Now, I am running into trouble to transfer new/deleted node within a 
> transaction with the existing migration format.
> C Xenstored will keep track of nodes accessed during the transaction but 
> not the children (AFAICT for performance reason).
Not performance reasons, but because there isn't any need for that:

The children are either unchanged (so the non-transaction node records
apply), or they will be among the tracked nodes (transaction node
records apply). So in both cases all children should be known.

In case a child has been deleted in the transaction, the stream should
contain a node record for that child with the transaction-id and the
number of permissions being zero: see docs/designs/xenstore-migration.md


Juergen

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