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b88acffd66
Today, compaction_backlog_tracker is managed in each compaction_strategy implementation. So every compaction strategy is managing its own tracker and providing a reference to it through get_backlog_tracker(). But this prevents each group from having its own tracker, because there's only a single compaction_strategy instance per table. To remove this limitation, compaction_strategy impl will no longer manage trackers but will instead provide an interface for trackers to be created, such that each compaction group will be allowed to have its own tracker, which will be managed by compaction manager. On compaction strategy change, table will update each group with the new tracker, which is created using the previously introduced ompaction_group_sstable_set_updater. Now table's backlog will be the sum of all compaction_group backlogs. The normalization factor is applied on the sum, so we don't have to adjust each individual backlog to any factor. Signed-off-by: Raphael S. Carvalho <raphaelsc@scylladb.com>