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The PROMPT real-time commit protocol

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Title The PROMPT real-time commit protocol
 
Creator HARITSA JR
RAMAMRITHAM, K
GUPTA, R
 
Subject distributed real-time database
commit protocol
two phase commit
three phase commit
priority inheritance
performance evaluation
 
Description We investigate the performance implications of providing transaction atomicity for firm-deadline real-time applications operating on distributed data. Using a detailed simulation model, the real-time performance of a representative set of classical transaction commit protocols is evaluated. The experimental results show that data distribution has a significant influence on real-time performance and that the choice of commit protocol clearly affects the magnitude of this influence. We also propose and evaluate a new commit protocol, PROMPT (Permits Reading Of Modified Prepared-data for Timeliness), that is specifically designed for the realtime domain. PROMPT allows transactions to "optimistically" borrow, in a controlled manner, the updated data of transactions currently in their commit phase. This controlled borrowing reduces the data inaccessibility and the priority inversion that is inherent in distributed real-time commit processing. A simulation-based evaluation shows PROMPT to be highly successful, as compared to the classical commit protocols, in minimizing the number of missed transaction deadlines. in fact, its performance is close to the best on-line performance that could be achieved using the optimistic lending approach. Further, it is easy to implement and incorporate in current database system software. Finally, PROMPT is compared against an alternative priority inheritance-based approach to addressing priority inversion during commit processing. The results indicate that priority inheritance does not provide tangible performance benefits.
 
Publisher IEEE COMPUTER SOC
 
Date 2011-07-31T15:22:56Z
2011-12-26T12:53:03Z
2011-12-27T05:40:09Z
2011-07-31T15:22:56Z
2011-12-26T12:53:03Z
2011-12-27T05:40:09Z
2000
 
Type Article
 
Identifier IEEE TRANSACTIONS ON PARALLEL AND DISTRIBUTED SYSTEMS, 11(2), 160-181
1045-9219
http://dspace.library.iitb.ac.in/xmlui/handle/10054/8157
http://hdl.handle.net/10054/8157
 
Language en