Task 1-1

Update. Currently, web preemption is available for read-only queries. Supporting update queries require to define web preemption for update queries. This means we need to guarantee that  SPARQL update query can be suspended and resumed with short overhead. We also need to determine which consistency criteria can be achieved with web preemption: eventual consistency, update consistency, causal consistency. We plan to go further and study how we can use web preemption with multi-version concurrency control.