Adjourn State Concurrency Control Avoiding Time-Out Problems in Atomic Commit Protocols

Abstract

The use of atomic commit protocols in mobile adhoc networks involves difficulties in setting up reasonable timeouts for aborting a pending distributed transaction. This paper presents the non-blocking Adjourn State, a concurrency control modification which makes time-outs in an atomic commit protocol for aborting a transaction unnecessary. Further, it enhances concurrency among transactions performing conflicting accesses to resources used by completed distributed transactions waiting for the commit protocol to be initiated.

Blocking reduction for distributed transaction processing within MANETs

“…Beyond our previous contributions [30] and [7], this article further -provides a detailed Web service transaction model, -shows implementations of the Adjourn state for both locking and validation concurrency control, -explains how sub-transaction dependencies and commit-status information shared in the Commit tree can be used to partially restart and re-use sub-transactions, and -gives experimental results for the Adjourn state and evaluates the effect of setting up different time-outs regarding transaction throughput and overall blocking time.…”