US 5,327,532 AGranted

Coordinated sync point management of protected resources

AssigneeInternational Business Machines Corporation

InventorsMichael K. Ainsworth, Cherie C. Barnes, Robert B. Bennett, Barbara A. M. Maslak, Edmond A. Pruul, James M. Showalter, Thomas J. Szczygielski, Amos S. Tanner

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Abstract

In a computer system or process, sync point managers are distributed throughout each real machine for a plurality of execution environments, but all of the execution environments and sync point managers within one real machine share a common recovery facility and recovery log. A common recovery log is used by the recovery facility for all of the execution environments in the system. Different systems are interconnected by a communication facility and each has its own recovery facility and recovery log. A protected conversation can be initiated between the first and second execution environments in the same real machine, and the sync point managers within the respective execution environments coordinate the two-phase commit procedures associated with the protected conversations. A conversation manager within each real machine assists in routing the conversation between the first and second execution environments. Each resource manager, whether residing inside or outside of the real machine, has its own recovery log, but uses the recovery facility of the real machine that accesses the resource.

Claims21

Dependent claims

A computer system or network comprising:

a first execution environment;
first sync point manager means, residing in said first execution environment, for coordinating a first commit procedure for said first execution environment;
means for coupling said first sync point manager means to a first resource manager which manages a first resource involved in said first commit procedure;
a second execution environment;
second sync manager means, residing in said second execution environment, for coordinating a second commit procedure for said second execution environment;
means for coupling said second sync point manager means to a second resource manager which manages a second resource involved in said second commit procedure;
recovery facility means, coupled to said first and said second sync point manager means to receive sync point information for and identification of said first and second resource managers in said first and second commit procedures, for recovering said first commit procedure and said second commit procedure;
and
means for coupling said recovery facility means to said first resource manager and said second resource manager bypassing said first sync point manager means and said second sync point manager means, said recovery facility means recovering said first commit procedure by communicating a commit or backout command to said first resource manager bypassing said first and second sync point manager means and recovering said second commit procedure by communicating a commit or backout command to said second resource manager bypassing said first and second sync point manager means.

6 more elements

A process for sync point management of protected resources, said process comprising the steps of:

executing a first application in a first execution environment;
coordinating a first, two-phase commit procedure for said first application with a first sync point manager residing in said first execution environment, said first commit procedure involving a first resource manager;
executing a second application in a second execution environment;
coordinating a second, two-phase commit procedure for said second application with a second sync point manager residing in said second execution environment, said second commit procedure involving a second resource manager, said first and second commit procedures being related to each other within one distributed transaction;
and
recovering said first and second commit procedures with a common recovery facility coupled to said first and second execution environments;
and wherein
the first commit procedure is coordinated by said first sync point manager supplying to said recovery facility sync point information for and identification of said first resource manager involved in said first commit procedure;
the second commit procedure is coordinated by said second sync point manager supplying to said recovery facility sync point information for and identification of said second resource manager involved in said second commit procedure;
and
said first commit procedure is recovered by said recovery facility communicating a commit or backout command to said first resource manager bypassing said first and second sync point managers and said second commit procedure is recovered by said recovery facility communicating a commit or backout command to said second resource manager bypassing said first and second sync point managers.

8 more elements

Dependencies are inferred from the claim text.