Fast retrieval of data stored in metadata

• US 20030200193A1
• Filed: 04/17/2002
• Published: 10/23/2003
• Est. Priority Date: 04/17/2002
• Status: Abandoned Application

• Current Assignee: Sun Microsystems Incorporated (Oracle Corporation)
• Original Assignee: Sun Microsystems Incorporated (Oracle Corporation)
• Inventors: Boucher, Michael L.
• Application Number:
  US10/124,681
• Publication Number:
  US 20030200193A1
• Time in Patent Office: Days
• US Class Current: 707/1
• CPC Class Codes: G06F 16/10 File systems; File servers

Abstract

A fast access system for data stored in a file system is provided. Because there is typically far less overhead with the fast access system than a conventional file system, the fast access system provides a substantial boost in data access efficiency. File names themselves in the fast access system store data for later retrieval. As a result, the file system may retrieve metadata maintained in the file system, rather than opening the file itself, to obtain the data. Thus, the methods and systems accelerate retrieval of data by avoiding significant overhead that would be required for a conventional file system to open and read data from a file.

Claims

1. A method in a data processing system for storing data, the method comprising the steps of:

receiving a request to store predetermined data;

forming a file name comprising the predetermined data; and

creating a file with the file name.

2. The method of claim 1, wherein the step of forming comprises the step of forming the file name comprising the predetermined data, and an opening label and a closing label that identify a data type for the predetermined data.

3. The method of claim 1, wherein the step of forming comprises the step of forming the file name comprising the predetermined data and an XML opening label and a n XML closing label.

4. The method of claim 1, wherein the step of creating a file comprises the step of creating the file with the file name on a secondary storage device.

5. The method of claim 1, further comprising the step of adding characterizing data for the file to metadata maintained in the data processing system.

6. The method of claim 1, wherein the step of adding characterizing data comprises the step of adding the file name and a directory path to the file to metadata maintained in the data processing system.

7. A computer-readable medium containing instructions that cause a data processing system to perform a method for storing data, the method comprising the steps of:

receiving a request to store predetermined data;

forming a file name comprising the predetermined data; and

creating a file with the file name.

8. The computer-readable medium of claim 7, wherein the step of forming comprises the step of forming the file name comprising the predetermined data and an opening label and a closing label that provide an identification of the type of predetermined data.

9. The computer-readable medium of claim 7, wherein the step of creating a file comprises the step of creating the file with the file name on a secondary storage device.

10. The computer-readable medium of claim 7, wherein the method further comprises the step of adding the file name and a directory path to the file to metadata maintained in the data processing system.

11. The computer-readable medium of claim 7, wherein the step of creating the file comprises the step of creating a zero-length file with the file name.

12. A data processing system comprising:

a memory comprising a file service program, the file service program for receiving a request to store predetermined data, forming a file name comprising the predetermined data, and creating a file with the file name; and

a processor that runs the file service program.

13. The data processing system according to claim 12, further comprising metadata stored in the memory, the metadata comprising the file name and a directory path to the file.

14. The data processing system according to claim 12, wherein the file is a zero-length file.

15. The data processing system according to claim 12, wherein the file name further comprises an opening tag and a closing tag that identify a data type for the predetermined data.

16. The data processing system according to claim 15, wherein the file name comprises the opening tag, followed by the predetermined data, followed by the closing tag.

17. The data processing system according to claim 15, wherein the memory comprises a hard disk.

18. A data processing system comprising:

means for receiving a request from a program to store predetermined data;

means for forming a file name incorporating the predetermined data; and

means for running a file service program to create a file with the file name.

19. A computer-readable memory device encoded with a data structure created by a file service program that is encoded in the computer-readable memory device and that is run by a processor in a data processing system, the data structure comprising entries, each entry associated with a file and each entry comprising:

a file name field comprising a file name comprising data to be stored by a program.

20. A computer readable-memory device according to claim 19, wherein each entry further comprises a directory path field for storing a directory path to the file.

21. A method in a data processing system for storing data, the method comprising the steps of:

receiving, by a file service program, a request submitted by a requesting program to store predetermined data in a file system;

forming a file name comprising the predetermined data;

analyzing metadata stored in the data processing system to determine whether a file with the file name can be created in the file system;

when the file can be created, adding the file name to file system metadata stored in the data processing system, creating the file in the file system, and returning a success indication to the requesting program; and

when the file cannot be created, returning a failure indication to the requesting program.

22. The method of claim 21, wherein the step of forming comprises the step of forming the file name comprising the predetermined data, and an opening label and a closing label that identify a data type for the predetermined data.

23. The method of claim 21, wherein the step of forming comprises the step of forming the file name comprising the predetermined data, and an XML opening label and an XML closing label.

24. The method of claim 21, wherein the step of creating the file comprises the step of creating a zero-length file in the file system.

25. The method of claim 21, wherein the step of adding the file name to file system metadata further comprises the step of adding a directory path to the file to the file system metadata.