Exploiting Parallelism of Distributed Nested Transactions

We present SPCN, a framework that further extends the benefits of having distributed partially rollbackable (closed-nested) transactions by exploiting their parallel activation. SPCN provides support for executing each closed-nested transaction in parallel with others belonging to the same parent transaction. Their commit sequence is equivalent to the serial commit execution, but parallelism is leveraged to improve performance by reducing the amount of serial network communication. As we show in our evaluation study using 20 nodes on Amazon EC2 and three well-known benchmarks, SPCN provides performance improvement over the original closed nesting, gaining more than 2× in throughput.