htools: update the node-evac/change-group result
… per the new design changes. This also requires changes toupdateEvacSolution, as passing in the original instance is nothelpful; we just pass the instance index now and look up the actualinstance in the modified instance map....
htools: add function for getting all nodes of an instance
Signed-off-by: Iustin Pop <iustin@google.com>Reviewed-by: Guido Trotter <ultrotter@google.com>
htools: add change-group IAllocator mode
This builds a lot upon the node-evacuation mode, and itsimplementation is therefore quite easy (once node-evac was added).
htools: add group restrictions to findBestAllocGroup
While a normal multi-group allocation doesn't need to restrict thelist of target groups beyond the unallocable status of some groups,when we relocate instances from one group to the other we need tolimit the subset of searched groups....
htools: generalise and rename availableLocalNodes
Currently this function works in the context of an instance, computingits local group nodes. We can use generalise it to take a group indexargument, so that it's not bound to an instance, and we rename it...
htools: add ChangeGroup to IAllocator types/loader
This patch updates the types and functions in IAllocator.hs andLoader.hs to the new design changes (elimination of multi-relocatemode and replacement with change-group).
It also removes an extra re-export of EvacMode from Loader.hs....
htools: split tryMGAlloc in two
Currently, this function does both identify the best group for aninstance, and format the results (partially). The former functionalityis useful in other contexts too, so let's split the function in two.
Signed-off-by: Iustin Pop <iustin@google.com>...
htools: add node-evacuation of DRBD all nodes
This is much more complicated than either change primary (which istrivial) and change secondary (which is also simple).
The main strategy is:
- choose a new secondary (that will become the final primary) and...
htools: small optimisation in Cluster.collapseFailures
This makes fewer temporary data structures, and thus brings a bit ofimprovement in total runtime.
htools: add optional limit to allocation count
Currently, the tieredAlloc/iterateAlloc functions will not returnuntil the allocation fails; this means unit-testing theirfunctionality (e.g. that an instance can be allocated) is slow, sincethey will allocate all possible instances....
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