SYSTEM AND METHOD FOR SUPPORTING SERVICE LEVEL QUORUM IN A DATA GRID CLUSTER

• US 20120198455A1
• Filed: 01/17/2012
• Published: 08/02/2012
• Est. Priority Date: 01/28/2011
• Status: Active Grant

• Current Assignee: Oracle International Corporation (Oracle Corporation)
• Original Assignee: Oracle International Corporation (Oracle Corporation)
• Inventors: Lee, Robert H., Falco, Mark, Gleyzer, Gene, Purdy, Cameron
• Granted Patent: US 9,262,229 B2
• Time in Patent Office: Days
• US Class Current: 718/100
• CPC Class Codes: G06F 11/1425 by reconfiguration of node membership
• CPC Class Codes: G06F 2209/505 Clust
• CPC Class Codes: G06F 9/5061 Partitioning or combining of resources
• CPC Class Codes: H04L 41/5054 Automatic deployment of services triggered by the service manager, e.g. service implementation by automatic configuration of network components
• CPC Class Codes: H04L 67/10 in which an application is distributed across nodes in the network software deployment G06F8/60; multiprogramming arrangements G06F9/46
• CPC Class Codes: H04L 67/51 Discovery or management thereof, e.g. service location protocol [SLP] or web services

Abstract

A system and method is described for use with a data grid cluster, for supporting service level quorum in the data grid cluster. The data grid cluster includes a plurality of cluster nodes that support performing at least one service action. A quorum policy, defined in a cache configuration file associated with the data grid cluster, can specify a minimum number of service members that are required in the data grid cluster for performing the service action. The data grid cluster uses the quorum policy to determine whether the service action is allowed to be performed, based on a present state of the plurality of cluster nodes in the data grid cluster.

Claims

1. A system for supporting service level quorum in a data grid cluster, comprising:

a plurality of cluster nodes in the data grid cluster, wherein the data grid cluster supports performing at least one service action; and

a quorum policy defined in a cache configuration file associated with the data grid cluster, wherein the quorum policy specifies a minimum number of service members that are required for performing the at least one service action, and

wherein the data grid cluster use the quorum policy to determine whether the at least one service action is allowed to be performed based on how many cluster nodes in the data grid cluster are qualified as service members.

2. The system according to claim 1, wherein:

another quorum policy is defined in the cache configuration file associated with the data grid cluster, wherein the another quorum policy specifies a minimum number of service members that are required for performing another service action.

3. The system according to claim 1, wherein:

the at least one service action is a root cluster service that keeps track of the membership and services in the cluster.

4. The system according to claim 1, wherein:

the quorum policy defines a timeout survivor quorum that specifies a minimum number of cluster nodes that must remain in the data grid cluster when a root cluster service is terminating suspect members, wherein a cluster node becomes a suspected cluster member when it has not responded to network communications.

5. The system according to claim 1, wherein:

the quorum policy defines at least one of

a distribution quorum that specifies a minimum number of storage-enabled members of a partitioned cache service that must be present before the partitioned cache service is allowed to perform partition distribution,

a restore quorum that specifies a minimum number of storage-enabled members of a partitioned cache service that must be present before the partitioned cache service is allowed to restore lost primary partitions from backup,

a read quorum that specifies a minimum number of storage-enabled members of a partitioned cache service that must be present in order to process read requests. A read request is any request that does not mutate the state or contents of a cache, and

a write quorum that specifies a minimum number of storage-enabled members of a partitioned cache service that must be present in order to process write requests. A write request is any request that may mutate the state or contents of a cache.

6. The system according to claim 1, wherein:

the quorum policy defines a connection quorum that specifies a minimum number of proxy service members that must be available before the proxy service can allow client connections.

7. The system according to claim 6, wherein:

the quorum policy is defined in a scheme element in the cache configuration file, when the scheme element supports scheme reference.

8. The system according to claim 1, further comprising:

a pluggable interface that allows users to implement at least one custom policy in order to control behaviors of the data grid cluster.

9. The system according to claim 9, wherein:

the at least one custom policy is defined based on at least one of

a particular time,

availability of a particular resource, and

an external event.

10. The system according to claim 9, wherein:

the quorum policy refers the at least one custom policy.

11. The system according to claim 9, wherein:

the quorum policy use a factory class to create the at least one custom policy.

12. A method for supporting service level quorum in a data grid cluster, comprising:

providing at least one service action in the data grid cluster with a plurality of cluster nodes;

defining a quorum policy in a cache configuration file associated with data grid cluster, wherein quorum policy specifies a minimum number of service members that are required for performing the at least one service action; and

using the quorum policy to determine whether the at least one service action is allowed to be performed based on a present state of the plurality of cluster nodes in the data grid cluster.

13. A machine readable medium having instructions stored thereon that when executed cause a system to perform the steps of:

providing at least one service action in the data grid cluster with a plurality of cluster nodes;

defining a quorum policy in a cache configuration file associated with data grid cluster, wherein quorum policy specifies a minimum number of service members that are required for performing the at least one service action; and

using the quorum policy to determine whether the at least one service action is allowed to be performed based on a present state of the plurality of cluster nodes in the data grid cluster.