US 6,295,548 B1 · Detection of an imported transaction for finding the global transaction identifier

Abstract

Systems and methods for ensuring that two different subordinate transactions will not be created at any given transaction processing node for the same parent transaction. Upon receiving a work request from a remote transaction processing system, the local transaction manager creates a local subordinate transaction associated with the parent transaction. A local transaction identifier that identifies the local subordinate transaction is also created. The local identifier includes an indicator, such as a one-bit flag, which identifies the local subordinate transaction as an imported transaction. The global identifier for the parent transaction is stored to a map in association with the transaction identifier of the new local subordinate transaction. If a work request associated with an imported transaction is sent to a remote transaction processing system, the global transaction identifier of the parent transaction is retrieved from the map and included in the work request so that the receiving system will know that the work request is associated with the parent transaction. In this manner, the receiving system will know not to start a new subordinate transaction on behalf of the parent transaction if a transaction subordinate to the parent transaction has already been started on that system.

Claims15

Dependent claims

A transaction processing system communicably coupled to two or more remote transaction management nodes, the system comprising:

a transaction manager (TM), wherein the TM receives a first request associated with a first transaction exported by a first remote transaction management node, wherein the first request has a first transaction identifier that includes a global transaction identifier (G1) associated with the first transaction, wherein the TM creates a second transaction associated with the first transaction, the second transaction having an associated local transaction identifier (L2) that includes a flag indicating that the second transaction is associated with an imported transaction;
and
an application process that performs work for the second transaction, wherein when the application process desires to send a second request associated with the second transaction to a second remote node, the TM reads the flag in the second local transaction identifier (L2) and creates a second transaction identifier to be sent with the second request, wherein the second transaction identifier includes the first global transaction identifier (G1) and the second local transaction identifier (L2), such that when the second request is processed by the second remote node, the second remote node will know that the second transaction is associated with the first transaction.

A method of communicating work requests associated with imported transactions to remote nodes in a transaction processing system communicably coupled to two or more remote transaction management nodes, the processing system having a transaction manager (TM) and an application process, the method comprising the steps of:

receiving a first work request associated with a first transaction from a first remote transaction management node, the first work request having a first transaction identifier that includes a global transaction identifier (G1) associated with the first transaction;
creating a second transaction associated with the first transaction, the second transaction having an associated local transaction identifier (L2) that includes a flag indicating that the second transaction is associated with an imported transaction;
performing work for the second transaction by the application process;
creating a second transaction identifier for the second transaction when the application process desires to send a second work request associated with the second transaction to a second remote node, the second transaction address including the first global transaction identifier (G1) and the second local transaction identifier (L2);
and
sending the second work request to the second remote node, wherein the second work request includes the second transaction identifier, such that when the second work request is processed by the second remote node, the second remote node will know that the second transaction is associated with the first transaction.

3 more elements

Dependencies are inferred from the claim text.

Detection of an imported transaction for finding the global transaction identifier

Life of this patent

Detection of an imported transaction for finding the global transaction identifier

Life of this patent

Abstract

Claims15