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a21c4abad7
If migration_manager::get_schema_for_write is called after migration_manager::drain, it throws abort_requested_exception. This exception is not present in replica::exception_variant, which means that RPC doesn't preserve information about its type. If it is thrown on the replica side, it is deserialized as std::runtime_error on the coordinator. Therefore, abstract_read_resolver::error logs information about this exception, even though we don't want it (aborts are triggered on shutdown and timeouts). To solve this issue, we add abort_requested_exception to replica::exception_variant and, in the next commits, refactor storage_proxy::handle_read so that abort_requested_exception thrown in migration_manager::get_schema_for_write is properly serialized. Thanks to this change, unchanged abstract_read_resolver::error correctly handles abort_requested_exception thrown on the replica side by not reporting it.