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Tomasz Grabiec f26e65d4d4 tablets: Fix crash on table drop

Before the patch, tablet metadata update was processed on local schema merge
before table changes.

When table is dropped, this means that for a while table will exist
without a corresponding tablet map. This can cause memtable flush for
this table to fail, resulting in intentional abort(). That's because
sstable writing attempts to access tablet map to generate sharding
metadata.

If auto_snapshot is enabled, this is much more likely to happen,
because we flush memtables on table drop.

To fix the problem, process tablet metadata after dropping tables, but
before creating tables.

Fixes #14943

Closes #14954

2023-08-06 16:45:43 +03:00