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f565f3de06
Each time backlog tracker is informed about a new or old sstable, it
will recompute the static part of backlog which complexity is
proportional to the total number of sstables.
On schema change, we're calling backlog_tracker::replace_sstables()
for each existing sstable, therefore it produces O(N ^ 2) complexity.
Fixes #12499.
Signed-off-by: Raphael S. Carvalho <raphaelsc@scylladb.com>
Closes #12593
(cherry picked from commit 87ee547120)
Signed-off-by: Raphael S. Carvalho <raphaelsc@scylladb.com>