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For the frontend, one function works as well as two would. However, I can see
how it would simplify code on the backend to just pass a blockTimes id since
it wouldn't have to determine all of the other information (blockTimes
entries include blockrequestids; so, the blockrequestid wouldn't need to be
passed as well).
So, how about this, keep the function already described except drop
the 'blockTimeid' parameter and add this function as well:
blockTimesid - id from the blockTimes table
ignoreprivileges - 0 (false) or 1 (true) - set to 1 to select computers from
any that are mapped to be able to run the image; set to 0 to only select
computers from ones that are both mapped and that users in the usergroup
assigned to this block request have been granted access to through the
returns: the number of machines that were successfully allocated, with 0
indicating a complete failure of not being able to allocate any computers
I just realized a problem in the return part of both functions. What if the
function is called too close to the start time to be able to preload the
computers by then? Should it just return 0 and not try to load any of them?
It may be that the functions need to return an array containing both a return
code and the number of computers that were successfully allocated. Thoughts?
On Thursday February 05, 2009, Aaron Peeler wrote:
> Would it make sense to break this into two functions?
> Have this function XMLRPCblockAllocation with only two parameters
> blockrequestid and blockTimeid.
> The second function would be to create the Block Allocation -
> --On February 4, 2009 4:39:30 PM -0500 Josh Thompson
> <josh_thomp...@ncsu.edu> wrote:
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> > I'm going to start work on VCL-78 which is an addition to the frontend
> > XML RPC API to allow the backend to call the frontend for allocating
> > computers for block reservations. Currently, the block reservations are
> > created in the frontend, but computers are not allocated to fulfill them
> > because the requested time(s) could be at any point in the future. So,
> > around 6 hours before a requested time, the backend picks up that block
> > reservation time slot, allocates computers for it, and then inserts
> > reload reservations early enough for the computers to be preloaded by
> > the start of the time slot.
> > This results in a fair amount of duplicated code, since the frontend
> > currently handles computer allocation in all other cases.
> > This is how I am planning on implementing it. Please reply with any
> > comments on doing it differently or tweaking it somehow. I'm open to
> > any suggestions.
> > The backend could just call the frontend with the blockTimes id to
> > process, but I'll make it more generic to be more useful in other cases
> > and require that the backend specify several items.
> > function name: XMLRPCblockAllocation
> > parameters:
> > imageid - id of the image to be used
> > start - unix timestamp for the start time (i.e. machines should be
> > prep'd and ready by this time)
> > end - unix timestamp for the end time
> > machinecount - number of computers to allocate
> > usergroupid - id of user group for checking user access to machines
> > ignoreprivileges - 0 (false) or 1 (true) - set to 1 to select computers
> > from any that are mapped to be able to run the image; set to 0 to only
> > select computers from ones that are both mapped and that users in
> > usergroupid have been granted access to through the privilege tree. If
> > this is set to 1, usergroupid is ignored (more on this below).
> > blockTimeid - id from blockTimes table that this will fulfill or 0 if
> > there is not an existing block reservation related to this call
> > returns: the number of machines that were successfully allocated, with 0
> > indicating a complete failure of not being able to allocate any computers
> > Description of how it will work:
> > The frontend will use the normal scheduling functions to allocate
> > computers and insert them into the blockComputers table. If blockTimeid
> > is 0, new entries will be created in the blockRequest and blockTimes
> > tables. It will create reload reservations for the computers early
> > enough for them to be loaded by the start time based on historical
> > loading times.
> > The ignoreprivileges flag exists to allow more machines to be available
> > for fulfilling block reservations than just those that the user group
> > has access to. The current implementation with the backend doing the
> > processing functions as if ignoreprivileges were set to 1.
> > That's pretty much it.
> > Josh
> > - --
> > - -------------------------------
> > Josh Thompson
> > Systems Programmer
> > Virtual Computing Lab (VCL)
> > North Carolina State University
> > josh_thomp...@ncsu.edu
> > 919-515-5323
> > my GPG/PGP key can be found at pgp.mit.edu
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> Aaron Peeler
> OIT Advanced Computing
> College of Engineering-NCSU
Virtual Computing Lab (VCL)
North Carolina State University
my GPG/PGP key can be found at pgp.mit.edu
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