# US 5,704,032 A · Method for group leader recovery in a distributed computing environment

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- Number: US 5,704,032 A
- Document ID: US5704032A
- Status: Granted
- Kind: A
- Application number: 08/640,219
- Filed: 1996-04-30
- Granted: 1997-12-30
- Earliest claimed: 1996-04-30
- Assignees: International Business Machines Corporation
- Inventors: Peter Richard Badovinatz; Tushar Deepak Chandra; Orvalle Theodore Kirby; John Arthur Pershing, Jr.
- Web page: https://patentgrep.com/patent/US5704032A

## CPC

- G06F 9/5061: {Partitioning or combining of resources}
- G06F 2209/505: Clust
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)

## Abstract

A new leader of a group of processors executing within a distributed computing environment is selected when the current group leader fails. The new group leader is selected from a membership list ordered in sequence of joins of processors to the group of processors. The selected leader is the next processor on the membership list after the failed group leader. In particular, it is the next active processor on the membership list. The group of processors is informed of the new group leader, after it is selected.

## Claims

### Claim 1

A method for recovering from a failed group leader of a group of processors of a distributed computing environment, said method comprising:
obtaining from a membership list ordered in sequence of joins of processors to said group of processors a next processor in said membership list; and
selecting said next processor as a new group leader of said group of processors.

### Claim 2 (depends on 1)

The method of claim 1, wherein said obtaining comprises obtaining a next active processor from said membership list.

### Claim 3 (depends on 1)

The method of claim 1, further comprising informing said group of processors of said new group leader.

### Claim 4 (depends on 1)

The method of claim 1, further comprising requesting appointment of said new group leader from a name server, said name server selecting said new group leader from said membership list.

### Claim 5 (depends on 1)

The method of claim 1, wherein said membership list is located at each processor of said group of processors.

### Claim 6 (depends on 5)

The method of claim 5, wherein said obtaining comprises obtaining, by a processor of said group of processors, said new group leader from said membership list at said processor, and further comprising informing a name server of said new group leader.

### Claim 7 (depends on 6)

The method of claim 6, further comprising informing, by said name server, said group of processors of said new group leader.

### Claim 8 (depends on 1)

The method of claim 1, further comprising receiving, by said new group leader, prior to said new group leader being selected as said new group leader, any messages previously sent to said group of processors.

### Claim 9 (depends on 8)

The method of claim 8, further comprising providing, by said new group leader, any messages missed by any processor of said group of processors.

### Claim 10 (depends on 1)

The method of claim 1, further comprising sending requests to said new group leader.