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`RandomTables.verify_schema` is often called in topology tests after performing a schema change. It compares the schema tables fetched from some node to the expected latest schema stored by the `RandomTables` object. However there's no guarantee that the latest schema change has already propagated to the node which we query. We could have performed the schema change on a different node and the change may not have been applied yet on all nodes. To fix that, pick a specific node and perform a read barrier on it, then use that node to fetch the schema tables. Fixes #13788 Closes #13789