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# Date Author Comment
0102e732 06/28/2013 12:46 pm Klaus Aehlig

Update design document for hroller

The requirement to be able to plan full node evacuation came up after
the initial design. So add a section describing the algorithm, if
full evacuation is requested.

Signed-off-by: Klaus Aehlig <>
Reviewed-by: Michele Tartara <>

4a4697de 05/06/2013 05:58 pm Klaus Aehlig

Change design of algorithm for computing rolling reboots

Instead of computing a coloring for one condition first and then refining
it for the other condition, we can construct a graph with edges for all
conditions that prevent simultaneous reboots. This will not only result...

fb4b885a 02/19/2013 09:36 pm Guido Trotter

HRoller design updates

- Specify that there will be options for selecting nodes by at least
nodegroups and tags, rather than just individually.
- Specify a better handling for non-redundant instances (eg. plain or
file) which today are simply ignored...

09208925 02/15/2013 11:29 am Guido Trotter

Hroller design doc

Hroller in 2.7 was implemented (as an experiment) but never explicitly
designed. This design mentions the current functionality, and explains
the changes that will happen for the next release to support live
maintenance scheduling (rolling reboot)....