Add configurable automatic group up/down feature based on node availability

Available under content cluster tuning tag; feature is currently disabled by
default (need prod experience for this first).
Also improves handling of nodes removed from config by ensuring these are
taken out of the core working cluster state instead of just patched away
before each state publish.

1 files changed, 8 insertions, 0 deletions

diff --git a/configdefinitions/src/vespa/fleetcontroller.def b/configdefinitions/src/vespa/fleetcontroller.def
index 919e9fc2209..0862beac64a 100644
--- a/configdefinitions/src/vespa/fleetcontroller.def
+++ b/configdefinitions/src/vespa/fleetcontroller.def
@@ -138,3 +138,11 @@ show_local_systemstates_in_event_log bool default=true
 
 ## The ideal number of distribution bits this system should have
 ideal_distribution_bits int default=16
+
+## Minimum ratio of nodes that have to be available (i.e. not Down) in any
+## hierarchic content cluster group. If a higher ratio than this is Down at
+## any point, the remaning nodes in the group will be automatically marked
+## as down. Group nodes will automatically be taken back up as soon as node
+## availability has been restored above the given threshold.
+## Default is 0, i.e. functionality is for all intents and purposes disabled.
+min_node_ratio_per_group double default=0.0