scholarly journals LIFT- A Linear Two-Phase Commit Protocol

2019 ◽  
Author(s):  
Aman Kumar Pandey ◽  
Sarvesh Pandey ◽  
Udai Shanker
Keyword(s):  
Recovery Process ◽  
Distributed Database ◽  
Database System ◽  
Two Phase ◽  
Recovery Mechanism ◽  
Linear Version ◽  
Distributed Database System ◽  
Performance Results ◽  
Transaction Commit ◽  
Message Overhead

Two phase commit (2PC) protocol is used to coordinate transaction commitment in distributed database system. The 2PC protocol is further classified into linear and centralized versions. The linear version of 2PC i.e. L-2PC protocol runs serially whereas in the centralized version, the commit process allows every site involved in executing the transaction to prepare and commit in parallel. In past, very little efforts have been made to overcome the unfavourable message overhead, poor recovery process and some other problems associated with L-2PC protocol. This paper proposes a Linear and Fast-paced recovery centred Transaction commit (LIFT) protocol to improve the existing recovery mechanism of linear 2PC by allowing autonomy to the participating cohorts to inform the cohort-in-doubt about the distributed transaction’s state instead of always looking for coordinator’s stand. The performance results confirm that proposed protocol will be a better alternative.

scholarly journals A Heterogeneous Distributed Computing Model Based on Web Service

CONVERTER ◽  
2021 ◽  
pp. 100-106
Author(s):  
Haitao Li
Keyword(s):  
Distributed Computing ◽  
Web Service ◽  
Distributed Database ◽  
Transaction Processing ◽  
Database System ◽  
Heterogeneous Database ◽  
Two Phase ◽  
Cross Platform ◽  
Heterogeneous Distributed Computing ◽  
Distributed Database System

Based on the in-depth study of the existing database synchronization model, in order to improve the cross platform ability of the system and facilitate the construction of small and medium-sized enterprise information platform, this paper proposes a heterogeneous distributed computing scheme based on Web service. The scheme uses JMS to realize the message transmission between systems, and uses web service technology to realize cross platform data reading and writing. In the aspect of distributed transaction processing, the two-phase commit protocol is improved to reduce the probability of system deadlock and effectively ensure the consistency of distributed database data. In order to improve the performance of distributed database system, cache technology is introduced, and the way of integrating cache and database transaction processing is proposed, which effectively ensures the validity of cache data. The architecture is oriented to program developers, who can develop efficient and convenient distributed database system on the basis of this architecture. Finally, this architecture is applied to the background management system of mobile express service. The running results show that the architecture can well meet the business requirements of distributed heterogeneous database system synchronization.

Design and implementation of a heterogeneous distributed database system

1990 ◽  
Vol 5 (4) ◽  
pp. 363-373
Author(s):  
Zhiquan Jin ◽  
Chengfei Liu ◽  
Zhongxiu Sun ◽  
Xiaofang Zhou ◽  
Peipei Chen ◽  
...  
Keyword(s):  
Distributed Database ◽  
Database System ◽  
Design And Implementation ◽  
Distributed Database System

scholarly journals Web Proxy Auto Discovery for Dynamically Created Web Proxies

2020 ◽  
Vol 245 ◽  
pp. 07026
Author(s):  
Dave Dykstra
Keyword(s):  
Distributed Database ◽  
Database System ◽  
General Purpose ◽  
Single Source ◽  
Sources Of Information ◽  
Proxy Cache ◽  
Proxy Caches ◽  
Distributed Database System ◽  
The Web

The WLCG Web Proxy Auto Discovery (WPAD) service provides a convenient mechanism for jobs running anywhere on the WLCG to dynamically discover web proxy cache servers that are nearby. The web proxy caches are general purpose for a number of different http applications, but different applications have different usage characteristics and not all proxy caches are engineered to work with the heaviest loads. For this reason, the initial sources of information for WLCG WPAD were the static configurations that ATLAS and CMS maintain for the Conditions data that they read through the Frontier Distributed Database system, which is the most demanding popular WLCG application for web proxy caches. That works well for use at traditional statically defined WLCG sites, but now that usage of commercial clouds is increasing, there is also a need for web proxy caches to dynamically register themselves as they are created. A package called Shoal had already been created to manage dynamically created web proxy caches. This paper describes the integration of the Shoal package into the WLCG WPAD system, such that both statically and dynamically created web proxy caches can be located from a single source. It also describes other improvements to the WLCG WPAD system since the last CHEP publication.

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