Both the simulate and the tiered allocation mode take a machine spec on
input via a comma-separated list. This patch makes this a little bit
more consistent (always use disk,ram,cpu in this order).

This patch adds the first version of tiered allocations where we
decrease instance specs on allocation failure and retry the allocation.
The output is not yet stable and the output changes are not documented
(yet).

This patch adds a function that, for some given failure modes, shrinks a
given instance in the hope that allocation will succeed when retried
with the new spec.

This also converts it to formatTable from hardcoded listing.

This patch reworks the internal handling of the instance spec CLI
option, and adds a tiered spec option that will be used in hspace to
enable the (auxiliary) tiered-spec allocation mode.

It also introduces a new data type for holding the instance
specification.

This allows us to do verification of option arguments in the assignment
functions themselves.

This doesn't need to be a monadic function, let's make it a simpler one.

Since the utilisation file might be generated at a different time from
the hbal run, and instances could dissapear in the meantime, it's better
to simply ignore unknown instances rather than abort.

The ordering was wrong, was showing node list details under
--print-instances.

This adds run status, resource parameters and load parameters for
instances.

0.1.8 was never documented in the NEWS file.

This patch changes the signature and implementation of the function;
returning the item makes more sense (saves a lookup later again in the
container, and applying idx is cheap), and the previous implementation
was ugly.

Since all values are initialized to zero, the exact ordering is not
important and thus we can use the positional mode for simpler code.

The patch also adds docstrings to the cstats functions.

Since we now have an actual type for describing the instance moves
(IMove), it's simpler to convert this into the move description/move
commands, rather than re-computing the move based on initial and final
nodes. This makes the shell commands computation and over-Luxi command
execution use the same method of computation.

The ‘Placement’ type has been moved to Types.hs but we kept exporting it
from Cluster, which is not needed.

This patch introduces a generic formatTable function (based on, and
similar to the Ganeti one, but different and more FP in style) and
changes the node and instance listing to it.

The node list (due to the many variables) is still a little bit hackish
unfortunately…

This enables the per-node load/total available capacity scores to be
used in balancing. Note that the total available capacity is currently
fixed at zero and cannot be changed by the user.

This patch adds loading and processing the utilisation data during
instance moves. While the data is not yet used, it is correctly modified
by instance changes between nodes.

hbal has the new ‘-U’ command line argument for this. The format of the
file is simply instance name and the four stats, space-separated.

The latter is only used right after the former in the Loader module, and
we'll need more of this 'update not with the data of this instance'
functionality (which is different than addPri where all information must
be updated).

The patch also changes the signature of Node.setSec (to remain
consistent with setPri).

These were already duplicate (Text and Simu) and we need tryRead in more places.

The strange printf usage is due to some limitation (it seems) in ghc for
very long argument lists. The whole printout should be rewritten later.

This patch adds the datatypes and modifies the nodes and instance types to have
such attributes. They are not used yet in any way.

This is similar to --print-nodes, but with much fewer fields.

This exports all functions, but it's still good to have.

This makes (for now) the code hlint-clean. This is per se not a huge
gain, but it allows easier tracking of regressions in style later
(one-two new violations are easier to diagnose when not hidden among 20
“known” ones).

This is again the cs_x to csX name change.

This changes from a_b to aB in all node and instance attributes, to
match the standard Haskell style. Also attributes that should have been
camel-cased but weren't were changed (e.g. plist → pList, pnode →
pNode).

Before we used a tuple; since we'll need more metrics in the future,
it's simpler to transform this into a list of doubles, whose elements
are handled homogeneously by all the code that needs them.

Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>

This not so nice patch adds submit/wait-for-completion functionality in
hbal. When enabled via ‘-X’ (only working on Luxi), it executes the jobs
(as split into separate jobsets by Cluster.splitJobs) and waits until
ganeti has finished all of them.

This is a rough version: it waits ad infinitum for completion, has
hardcoded timeouts, etc.

Signed-off-by: Iustin Pop <iustin@google.com>

Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>

This are higher level wrappers over the basic callMethod.

Signed-off-by: Iustin Pop <iustin@google.com>

The current Cluster.iMoveToJob always creates failovers, which is not
what we want. This simply used the original instances status to select
between these two (this is not optimal by the way, since the status
could have changed in the meantime).

Signed-off-by: Iustin Pop <iustin@google.com>