Optimistic transactional active replication

Hiroshi Horii, Hayato Yamana

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Critical database applications require 2-safe replication between at least two sites for disaster-tolerant services. At the same time, they must provide consistent and low-latency results to their clients in normal cases. In this paper, we propose Optimistic Transactional Active Replication (OTAR), which replicates the transaction logs with low latency and provides a consistent view to database applications. The latency of our replication is lower than Passive Replication, and guarantees the serializability of transaction isolation levels that cannot be supported by Active Replication. For our replication, each client sends a transaction request to all replicas and all of the replicas execute the request and optimistically return the result of the transaction to the client. Each replica generates a causality history of the transaction, sent to the client with the result. With the causality histories, the client can make sure that the requested transaction was executed in the same order at all of the replicas and eventually commit it. If the client cannot validate the order, then the client waits for the pessimistic result of the transaction from the replicas. This paper describes the algorithm and its properties.

Original languageEnglish
Title of host publicationProceedings of the 2nd International Conference on Ubiquitous Information Management and Communication, ICUIMC-2008
Pages94-100
Number of pages7
DOIs
Publication statusPublished - 2008 Dec 1
Event2nd International Conference on Ubiquitous Information Management and Communication, ICUIMC-2008 - Suwon, Korea, Republic of
Duration: 2008 Jan 312008 Feb 1

Publication series

NameProceedings of the 2nd International Conference on Ubiquitous Information Management and Communication, ICUIMC-2008

Conference

Conference2nd International Conference on Ubiquitous Information Management and Communication, ICUIMC-2008
CountryKorea, Republic of
CitySuwon
Period08/1/3108/2/1

Keywords

  • disaster tolerant
  • replication
  • transaction

ASJC Scopus subject areas

  • Computer Science Applications

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