Currently load balancer skips nodes only based on its "administrative"
state, i.e. whether it's drained/decommissioned/removed/etc. There's no
way to exclude any node from balancing decision based on anything else.
This patch add this ability by adding skiplist argument to
balance_tablets() method. When a node is in it, it will not be
considered, as if it was removenode-d.
Signed-off-by: Pavel Emelyanov <xemul@scylladb.com>
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