Synnefo » snf-ganeti » ganeti-local

Split the balancing function in two parts

Currently in the balancing function we do two thing:

- take the decision where to do a new balancing round or not
- and actually computing the balancing round

This is not nice, as the two parts are conceptually separate, so this...

Read cluster tags in the RAPI backend

This also shows them in hbal in verbose mode.

Add a command-line option to filter exclusion tags

Since we don't want all instance tags to be used for exclusion, we add a
command line option to filter on these. Since the iallocator protocol
cannot accept command line options, currently it's not possible to...

Add loading and processing of utilisation data

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...

Style change: cluster CStats camel-casing

This is again the cs_x to csX name change.

Extend the MoveJob type to hold the instance index

This will be needed in order to generate the proper instance move commands.

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

Move some more type definitions to Types.hs

Split the exernal data loader out of CLI.hs

Currently the external data loader is in CLI.hs, which makes all
programs that need cli functionality (options, etc.) link against the
network modules (most importantly curl). This patch splits this
functionality into a new module such that (for example) hail which only...

Implement support for 'cheap' moves only

This patch adds support for cheap (failover/migrate) operations only in
the balancing algorithm and in the hbal command line options.

This allows a very quick balancing (compared to allowing replace-disks)
which can be useful as a scheduled operation.

Unify the command line options and structures

This patch moves all the command line options and their internal
representation into CLI.hs. This means that duplicated options between
any two binaries are no longer declared twice, and that we no longer
need the two *Option classes.

Show errors on stderr instead of stdout

Currently many of the exit and warning conditions mistakenly display error
messages on stdout, which makes parsing the output of programs harder. This
patch attempts to fix such occurrences.

Add a new type for cluster statistics

Currently totalResources returns a 5-tuple of integers. This is not easy
to handle, as each change on the return type means that each caller must
be updated.

This patch adds a new type for cluster stats and uses that instead as...

Some documentation updates for the new parameters

Fix the various monomorphism warning

In a few places (e.g. tryRead or any printf call) it's a little bit hard
to add the correct type signatures, but in the it is possible to fix
these warnings (which can bite one in subtle cases).

Change the module import hierarchy

This patch makes the Types module a base module, and Node/Instance ones
import it, from the previous (opposite) situation. This will allow in
the future to use newtypes for the index and name types.

Remove most uses of ktn/kti

This patch removes all uses of ktn/kti from the past-loader stages.

Some small layout changes

Move checkData from Cluster to Loader

This moves the remaining loading function to Loader (together with its
associated support functions).

More code reorganizations

This new big patch does a couple of more cleanups in the loading of data
chapter:
- introduce a Types module that holds most types (except the base
Node/Instance/etc.) so that multiple other modules can use these
(instead of only Cluster and its users)...

Convert Cluster.loadData to Result return

This patch changes Cluster.loadData to return a Result, instead of
directly the values; this will allow us to return meaningful error
values (e.g. when an instances lives on unknown node) rather than simply
abort. Currently the result is always an Ok, the actual signalling of...

hbal: add a --quiet option

This option is the opposite of the --verbose option, and it allows
decreasing the verbosity level from the default of one to zero (which
currently doesn't show the warning messages for missing disk/memory).

hbal: Early exit when we don't have any instances

For clusters with no instances, there is no point in computing either
the score or in running the algorithm. In this case, we exit prematurely
and when running in one-line mode we show dummy information.

Add reading the file names from env vars

This patch adds support for selecting the instance/node file names via
two environment variables (HTOOLS_NODES, HTOOLS_INSTANCES).

Unfortunately we still have lots of duplicated code, since the options
are not unified.

Implement writing the command list to a script

This patch adds support in hbal for writing the command list to a shell
script, with error checking and allowing for early exit.

Show the x_mem/i_mem in node list

This patch adds checking of cluster data in the binaries and display of
node's x_mem/i_mem in the node list.

Add a separate type for the [(Int, String)] list

This is added for better readability, since this is very often used in
declarations.

Introduce a namespace for the modules

The modules are moved from the ‘top’ namespace to ‘Ganeti.HTools’, in
compliance with standard practices.