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d5539e080d
This change adds a stub for tablet cleanup on the replica side and wires it into the tablet migration process. The handling on replica side is incomplete because it doesn't remove the actual data yet. It only flushes the memtables, so that all data is in sstables and none requires a memtable flush. This patch is necessary to make decommission work. Otherwise, a memtable flush would happen when the decommissioned node is put in the drained state (as in nodetool drain) and it would fail on missing host id mapping (node is no longer in topology), which is examined by the tablet sharder when producing sstable sharding metadata. Leading to abort due to failed memtable flush.