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546b31846a
This introduces the ability to split a storage group. The main compaction group is split into left and right groups. set_split() is used to set the storage group to splitting mode, which will create left and right compaction groups. Incoming writes will now be placed into memtable of either left or right groups. split() is used to complete the splitting of a group. It only returns when all preexisting data is split. That means main compaction group will be empty and all the data will be stored in either left or right group. Signed-off-by: Raphael S. Carvalho <raphaelsc@scylladb.com>