Method and a system for performing a two-phase commit protocol

a two-phase commit and protocol technology, applied in the field of computer operating systems, can solve problems such as the inability to provide a solution to data inconsistency and the inability to commit for a long tim

Inactive Publication Date: 2011-03-31
IBM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]In particular the invention made it possible for the application program to define a commit priority for each resource manager during the commit phase of the two-phase commit protocol. Accordingly, when the system encounters a partial failure, involving data inconsistency for a period of time until compensation routines execute, it becomes possible with the invention to control such data inconsistency based on priorities.

Problems solved by technology

In case of failure during the commit phase of the two-phase commit protocol, the data becomes inconsistent for some time until the recovery happens.
However, these solutions do not provide a solution to data inconsistency until the recovery happens.

Method used

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  • Method and a system for performing a two-phase commit protocol

Examples

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Embodiment Construction

[0023]FIG. 1 shows an exemplary transactional environment for implementing a transactional system 100 in accordance with the invention. This system 100 is a distributed network of computing devices such as servers and databases that are connected together by one or more networks such as the Internet and / or local networks. Messages flow between the components of the system.

[0024]System 100 includes a number of nodes 11, 12, 13, 14 and 15 interconnected through one or more communication networks 101. The nodes of the system cooperate with each other via the communication network 101 to process transactions that originate at one node 11.

[0025]Each node 11-15 may include a CPU with a main memory and disk storage, coupled by a system bus (not shown). Each node may be for example a desktop workstation, a computer acting as a server, or a shared system resource such as disk storage.

[0026]Each node 11-15 may further include a resource manager to manage interaction with a Log (not shown) and...

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PUM

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Abstract

The invention provides an enhanced two phase commit process to perform a transaction started by an application program and involving access to one or more resources managed by respective resource managers. The method comprises the steps of:
enlisting the resource managers participating in the transaction, said enlisting step including associating a priority rank with each identified resource manager based on predefined priority rules; sending a prepare signal to said enlisted resource managers to begin the process of committing the transaction; and if a ready signal is received from all resource managers in response to the prepare signal, committing the resource managers in the order defined from the priority ranks associated with the resource managers.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority under 35 U.S.C. §119(a) to European Patent Application Serial Number 09171449.3, filed Sep. 28, 2009, entitled “A METHOD AND A SYSTEM FOR PERFORMING A TWO-PHASE COMMIT PROTOCOL”, the entirety of which is incorporated herein by reference.FIELD OF THE INVENTION[0002]The invention generally relates to computer operating systems, and in particular to an enhanced commit two-phase protocol for distributed data processing systems.BACKGROUND OF THE INVENTION[0003]In distributed data processing systems, two-phase commit protocols are used to coordinate transactions. Distributed transactions are widely used today to allow a computer system interact with several resources, and apply changes to resources while ensuring data consistency. A two-phase commit protocol requires that all resources in a distributed system agree to commit a transaction, before it is committed. This ensures that either all resources commit the...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G06F11/07G06F9/50
CPCG06F11/1474G06F9/466
Inventor EL-KERSH, EHABOBIDE, MOHAMED REFAAT
Owner IBM CORP
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