Naming service in a clustered environment

• US 9,122,686 B2
• Filed: 05/27/2004
• Issued: 09/01/2015
• Est. Priority Date: 05/27/2004
• Status: Active Grant

• Current Assignee: SAP SE
• Original Assignee: SAP SE
• Inventors: Petev, Petio, Pancheva, Elitsa
• Primary Examiner(s): SMARTH, GERALD A
• Application Number:
  US10/856,047
• Publication Number:
  US 20050278339A1
• Time in Patent Office: 4,114 Days
• Field of Search: 709/242, 709/245, 709/238, 707/10, 707/100
• US Class Current: 1/1
• CPC Class Codes: G06F 16/10 File systems; File servers

Abstract

Within a cluster, when a new server node joins the cluster, an indication of the new server node has joined is received by at least one server node in the cluster. Global naming operations are disabled within the cluster. While the global naming operations are disabled, the global naming objects are replicated to the new server node. Once the replication is complete, global naming is reenabled for the cluster. In one embodiment of the invention, subsequent naming data from subsequent global naming operations is replicated in all server nodes in the cluster. One embodiment of the invention redirects naming operations directed to a down server node to a different server node within the cluster. One embodiment of the invention performs security checks responsive to a first access to the naming service.

Claims

1. A system comprising:

a first server node;

a second server node;

a first naming service and a second naming service executing, using one or more processors, in the first server node and the second server node respectively, wherein the first naming service includes a first replication engine to replicate global naming data from the first server node to the second server node, and the second naming service includes a second replication engine to replicate the global naming data from the second server node to the first server node, the global naming data comprising objects resulting from naming operations; and

an identifier generator (IDG) to generate global unique identifiers (GUIDS) for the global naming data, wherein the IDG is located in the first naming service and generates the GUIDS from a server identifier of a creating server, a consecutive number of the global naming data, and context.

2. The system of claim 1 further comprising:

a security service to provide security interface for at least one of the first naming service and the second naming service.

3. The system of claim 2 wherein the security service provides authorization only when an initial context is requested by a remote client.

4. The system of claim 1 wherein the IDG comprises:

a counter to count global objects and contexts bound and created respectively in the system.

5. The system of claim 1 further comprising:

a connection service to provide a connection between a remote client and at least one of the first server node and the second server node.

6. The system of claim 5 wherein the connection service provides remote method invocation (RMI).

7. The system of claim 5 further comprising:

a cross service to redirect the connection from a first server node to a second server node if the first server node fails.

8. The system of claim 1 further comprising:

a locking service to prevent global naming operations in the system while a new server node joins the system; and

a replication engine in the new server node to replicate all global naming data in the new server node.

9. A method comprising:

receiving an indication that a new server node is joining a cluster of server nodes, the indication being a lock for global naming operations;

disabling the global naming operations within each server node in the cluster of server nodes;

replicating global naming objects in the new server node; and

enabling the global naming operations once replicating is complete.

10. The method of claim 9 further comprising:

identifying in a server node a global naming operation;

notifying other server nodes in the cluster of the global naming operation.

11. The method of claim 10 further comprising:

generating a unique global identifier for global objects from a server identifier of a creating server and a consecutive number of the global naming objects and contexts.

12. The method of claim 9 to further comprising:

redirecting a naming operation from a remote client directed to a target server node to a second server node if the target server node is down.

13. The method of claim 12 wherein redirecting comprises:

obtaining a name with which the second server is registered with a cross service; and

connecting a stub from the remote client to a skeleton from the second server.

14. The method of claim 9 further comprising:

checking an authorization of a remote client to use naming operations within the cluster only a first time the remote client attempts to access a naming service.

15. The method of claim 9 further comprising:

authenticating a remote client responsive to a request for an initial context.

16. An apparatus comprising:

means for proving global naming operations to generate a global unique identifier for each global object from a server identifier of a creating server, a consecutive number of the global naming data, and context;

means for replicating the global naming operations to a first server node joining a cluster;

means for notifying the cluster of global naming operations in any server node;

means for providing a connection between a remote client and at least one of the first server node and a second server node; and

means for providing, within each server, redirection of the connection from the first server node to the second server node if the first server node fails, the redirection by connecting a stub to a skeleton of the second server node.

17. The apparatus of claim 16 further comprising:

means for authenticating the remote client attempting naming operations; and

means for performing one time authorization of the remote client a first time a naming operation is attempted by the remote client.

18. A non-transitory machine-readable medium containing instructions that, when executed, cause a machine to perform operations comprising:

receiving an indication that a new server node is joining a cluster of servers, the indication being a lock for global naming operations;

disabling the global naming operations within each of the servers of the cluster of servers;

replicating global naming objects in the new server; and

enabling the global naming operations once replicating is complete.

19. The non-transitory machine-readable medium of claim 18 wherein the operations further comprise:

identifying in a server node a global naming operation;

notifying other server nodes in the cluster of the global naming operation.

20. The non-transitory machine-readable medium of claim 19 wherein the operation further comprise:

generating a unique global identifier for global objects from a server identifier of a creating server and a consecutive number of the global naming operation.

21. The non-transitory machine-readable medium of claim 18 wherein the operation further comprise:

redirecting a naming operation from a remote client directed to a target server node to a second server node if the target server node is down.

22. The non-transitory machine-readable medium of claim 21 wherein the operations further comprise:

obtaining a name with which the second server is registered with a cross service; and

connecting a stub from the remote client to a skeleton from the second server.

23. The non-transitory machine-readable medium of claim 18 wherein the operation further comprise:

checking an authorization of a remote client to use naming operations within the cluster only a first time the remote client attempts to access the naming operations.

24. The non-transitory machine-readable medium of claim 18 wherein the operation further comprise:

authenticating a remote client responsive to a request for an initial context.