NDLI: Maintaining Determinism in Replicated Middleware Applications

Content Provider	IEEE Xplore Digital Library
Author	Saravanan, R. Ramaraj, N.
Copyright Year	2008
Description	Author affiliation: Dept. of Comput. Sci. & Eng., PSNA Coll. of Eng. & Technol.., Dindigul (Saravanan, R.) \|\| GKM Eng. Coll., Chennai (Ramaraj, N.)
Abstract	Non determinism can lead to data inconsistency state in actively replicated environment. This defeats the purpose of replication as a fault-tolerance strategy. We proposed an efficient method which ensures determinism among the replicas in fault tolerance middleware applications. This method exploits the technique of statically analysing the application source code of client, and finds the variables and system calls which leads to non determinism in the replicas. A flag field is introduced to indicate that the source code of the client consists of non-deterministic variables, and it is sent to the servers together with client request. Flag is verified in servers, initiates the distributed coordination method if it is true else sends any one response of the servers to the client by duplicate removal. In distributed coordination method, all replicas execute incoming requests; one replica is elected as primary based on the time stamp value. It is responsible for taking all non-deterministic decisions. The state of the primary replica is updated to all other replicas connected asynchronously to maintain consistency. This method reduces the communication overhead. We evaluate our technique for the active replication of servers using micro benchmarks that contain various sources of non-determinism. i.e. multi-threading, system call, shared I/O and random ( ).
Starting Page	347
Ending Page	356
File Size	233228
Page Count	10
File Format	PDF
ISBN	9781424429622
DOI	10.1109/ADCOM.2008.4760472
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-12-14
Publisher Place	India
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Availability Distributed Coordination Maintenance engineering Data engineering Educational institutions Servers Application software Middleware Active replication Computer science Fault tolerance Non ¿ Determinism Time Stamp Fault tolerant systems Fault ¿ Tolerance Replication
Content Type	Text
Resource Type	Article

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