 -- When all the servers from a rack are removed, remove that rack  from the list of candidate racks available for write allocation.
 -- When all the servers from a rack are removed, remove that rack
 from the list of candidate racks available for write allocation.

sql-analytics/kosmosfs,sql-analytics/kosmosfs,sql-analytics/kosmosfs,sql-analytics/kosmosfs,sql-analytics/kosmosfs,sql-analytics/kosmosfs