Scalability Issues in CORBA

Sc alability is r ecognise d as a primary factor to b e consider ed in the design of distributed systems. The scalability of object oriented middleware CORBA becomes a major concern as it has emerged as a standard archite ctur e for distribute d obje ct computing.In this paper, a systematic scalability analysis of the basic components of CORBA speci c ationis attempted. F rom this analysis, Portable Object A dapter (POA) and Implementation R epository(IR) are identi ed to inuence scale of the CORBA based system. The speci cation of POA provides enough exibility for the applic ationdesigner to handle scalability. The existing implementations of IR have a trade o betwe en scalability and object migration. A scalable design of the IR is proposed which allows individual objects to migrate without compromising scalability. A performance comparison of the proposed model with the existing IR designs is made using a simulation study.