Self-assignment of node identifier in a cluster system

• US 8,943,082 B2
• Filed: 12/01/2010
• Issued: 01/27/2015
• Est. Priority Date: 12/01/2010
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Fontenot, Shevaun M., Fried, Eric P., Russell, Lance W., Mishra, Rajeev
• Primary Examiner(s): Singh, Amresh
• Application Number:
  US12/957,894
• Publication Number:
  US 20120143887A1
• Time in Patent Office: 1,518 Days
• Field of Search: 707/758, 707/687
• US Class Current: 707/758
• CPC Class Codes: H04L 61/5092 by self-assignment, e.g. picking addresses at random and testing if they are already in use

Abstract

In response to a stimulus indicating configuration of a node into a cluster of a plurality of nodes including the node, the node determines whether or not the node has a universally unique identifier (UUID), and if not, the node provides its own persistent self-assigned UUID. The node searches a cluster configuration database for a temporary identifier associated with the node. In response to the node locating the temporary identifier of the node in the cluster configuration database, the node writes its self-assigned UUID into the cluster configuration database and joins the cluster.

Claims

1. A method of data processing, comprising:

in response to a stimulus indicating configuration of a second node into a cluster of a plurality of nodes including the second node and a different first node that initiates the configuration of the second node into the cluster;

the second node determining whether or not the second node has a universally unique identifier (UUID) and, if not, the second node internally generating its own persistent self-assigned UUID without input from another node;

the second node searching a centralized cluster configuration database residing on a trusted shared data storage device accessible to all of the plurality of nodes for a temporary identifier associated with the second node; and

in response to the second node locating the temporary identifier of the second node in the cluster configuration database, the second node writing its self-assigned UUID into the cluster configuration database and joining the cluster.

2. The method of claim 1, wherein the temporary identifier comprises an Internet Protocol (IP) address assigned to the second node.

3. The method of claim 1, and further comprising:

in response to the second node locating the temporary identifier of the second node in the cluster configuration database, the second node updating metadata describing the second node in the cluster configuration database.

4. A data processing system, comprising:

a processor; and

a data storage device, coupled to the processor, that stores a cluster-aware program executable by the processor to cause the processor, responsive to a stimulus indicating configuration of the data processing system as a second node of a cluster including a plurality of nodes including the second node and different first node that initiates the configuration of the second node into the cluster, to determine whether or not the second node has a universally unique identifier (UUID) and, if not, to cause the second node to internally generate its own persistent self-assigned UUID without input from another node, wherein the cluster-aware program, responsive to the stimulus, further causes the processor to search a centralized cluster configuration database residing on a trusted shared data storage device accessible to all of the plurality of nodes for a temporary identifier associated with the second node, and responsive to locating the temporary identifier of the second node in the cluster configuration database, to write the second node'"'"'s self-assigned UUID into the cluster configuration database and to join the cluster.

5. The data processing system of claim 4, wherein the temporary identifier comprises an Internet Protocol (IP) address assigned to the second node.

6. The data processing system of claim 4, wherein the cluster-aware program causes the processor, responsive to the second node locating the temporary identifier of the second node in the cluster configuration database, to update metadata describing the second node in the cluster configuration database.

7. A program product, comprising:

a computer-readable storage device; and

a cluster-aware program stored in the computer-readable storage device and executable by a processor to cause a data processing system, responsive to a stimulus indicating configuration of the data processing system as a second node of a cluster including a plurality of nodes including the second node and different first node that initiates the configuration of the second node into the cluster, to determine whether or not the second node has a universally unique identifier (UUID) and, if not, to cause the second node to internally generate its own persistent self-assigned UUID without input from another node, wherein the cluster-aware program, responsive to the stimulus, further causes the data processing system to search a centralized cluster configuration database residing on a trusted shared data storage device accessible to all of the plurality of nodes for a temporary identifier associated with the second node, and responsive to locating the temporary identifier of the second node in the cluster configuration database, to write the second node'"'"'s self-assigned UUID into the cluster configuration database and to join the cluster.

8. The program product of claim 7, wherein the temporary identifier comprises an Internet Protocol (IP) address assigned to the second node.

9. The program product of claim 7, wherein the cluster-aware program causes the data processing system, responsive to the second node locating the temporary identifier of the second node in the cluster configuration database, to update metadata describing the second node in the cluster configuration database.