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c9f247f3e8
The sstable writer held the effective_replication_map_ptr while writing sstables, which is both a layering violation and slows down tablet load balancing. It was needed in order to ensure the sharder was stable. But it turns out that sharding metadata is unnecessary for tablets, so just skip the whole thing when writing an sstable for tablets. Closes scylladb/scylladb#16953 * github.com:scylladb/scylladb: sstables: writer: don't require effective_replication_map for sharding metadata schema: provide method to get sharder, iff it is static