JPS62226266A - Simultaneous access and roll-back control system - Google Patents

Abstract

PURPOSE:To avoid the useless file extension by inhibiting only the rolling back of the extent information stored in a data processor with a roll-back program, in case the file extent information is prepared at every data processor. CONSTITUTION:Data processors 1A and 1B are connected to a simultaneous access controller 7 and an external memory device 8 respectively. Both processors 1A and 1B contain record control means 2A and 2B, file extent control means 3A and 3B, roll-back control means 4A and 4B, extent information 5A and 5B, and jobs 6A and 6B respectively. In case the information 5A and 5B are prepared with processors 1A and 1B respectively, the means 4A and 4B perform the program roll-back and inhibit the roll-back only the extent information stored in both processors 1A and 1B. Thus it is possible to decrease the number input processing circuits for file extent information on the job where the file extension may possible carried out.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a simultaneous access and roll pack control method for programs and files in a data processing system that simultaneously outputs files on an external storage device from a plurality of data processing devices. In particular, it relates to a control method when file expansion is involved.

[Conventional technology]

Conventionally u,! Because the extent information of the file on the data processing device is returned to the state before file expansion due to program roll puncture, whether the file extent information on the external storage device is always input when requesting output immediately after program roll pack, or File extensions are performed only on the extent information of files on the own data processing device, and file extensions from other data processing devices.

When a program is roll-packed, extent information of a file on a data processing device does not reflect the fact that the program is roll-packed.

Margins below [Problems to be Solved by the Invention] The conventional method described above has poor performance because extent information on the external storage device is always input when an output request is made immediately after a program roll pack. Also, they were not aware of file expansion on other data processing devices, or that the extent information of files on the data processing device would be rollbanked when the program was rolled back. Therefore, it had the disadvantage of unnecessary file expansion.

[Failure to solve the problem]

Concurrent access and rollback of the present inventionff1ll
The 55 system has multiple data processing devices, an external storage device that has files to be shared, and a simultaneous access control device that controls simultaneous access to files shared among the multiple data processing devices. In a data processing system where a job that outputs all data in the above shared file is executed in parallel on multiple data processing devices, the address of the output block obtained based on the record output request from the job is the data processing If the extent information of the file registered in the device is outside the range of the file indicated, the file expansion control means is requested to expand the file, and the simultaneous access control device is requested to control simultaneous block access, and then the record is Based on the record control means that outputs the file and the file extension request from this record control means, the file extent information on the data processing device and the file extent information on the external storage device are checked. Register the file extent information on the storage device as the extent information of the file on the input citator processing device, and if it has not been expanded, expand the file and re-register the extent information of the file on the external processing device and data processing device. When roll-packing a program and file up to a checkpoint based on a roll-thick request from a file expansion control means and a job or record control means, only the file extent information on the data processing device is not roll-packed. and pack control means.

〔Example〕

Next, the configuration of the present invention will be explained in detail with reference to the drawings.

Referring to FIG. 1, two embodiments of the present invention include data processing apparatuses IA and IB, record control means for two people and 2B.
, file expansion control means 3A and 3B, and roll pack control means 4A and 4B.

Extent information 5A and 5B, Noyop 6A and 6
B. Simultaneous access control device 7. External storage device 8. File extent information9. File 10, extent 1
It is composed of 0-1, 10-2 and 10-3.

Referring to FIG. 2, record control means 2A and 2B
is the address calculation unit 21. Address check section 22. File extension request section 23. Simultaneous access control request unit 24.
The file expansion control means 3A and 3B are composed of the record processing section 25, and the extent information determination section 31.
File extension section 32. It consists of an extent information registration section 33.

Next, the operation of the present invention will be explained with reference to the drawings. For convenience of explanation, a case where a program operating as job 6A requests output of a record in file 10 will be described as an example.

Based on the output request from the job 6A, the record control means 2A uses the address calculation unit 21 to calculate the address of the block in which the record is to be stored.

The extent information 5A is checked by the address check unit 22.
Check whether the address is within the file based on k bases.

If it is outside the file, the file extension control means 3A is operated by the file extension request processing 23.

The file extension control means 3AJ"t inputs the file extent information 9 in the external storage device 8 and compares it with the extent information 5A in the data processing device IA by the extent information determination process 31. If the comparison result is different, Since the file has already been expanded in another data processing device or the program after file expansion has been roll-packed and file expansion is not necessary, it is re-registered in the extent information 5A in the data processing device IA in the extent information registration process 33. If the comparison results match, expand the file in file expansion processing 32,
The file extent information 9 in the external storage device 8 is re-registered, and the extent information 5A in the data processing device IA is re-registered in the extent information registration process 33.

Next, the two record control means request the simultaneous access control device 7 for the right to refer to and update the block through the simultaneous access control request process 24, and if the request is accepted, the record processing section 25 outputs the record.

When the block reference tank is not accepted and it is determined that there is a deadlock, or when a rollback request is issued from Noyop 6A and the program and file are rolled back. *The roll puncture control means 4A 6
The program and files are rolled back up to the time of the checkpoint request from A, but only the extent information 5A in the data processing device IA is not rolled packed.

〔Effect of the invention〕

As explained above, the present invention is applicable to a case where each data processing device has file extent information.

By not roll-packing only the extent information in the data processing device due to program roll puncture, the effect is to reduce the number of times file extent information input processing is performed for jobs that may cause file expansion, and to improve performance. By checking the file extent information on the external storage device only when an output request is made outside the file, and by not using the 760g roll pack to roll pack the extent information inside the data processing device, unnecessary file expansion can be prevented. You can get the effect that you can.

[Brief explanation of drawings]

FIG. 2 is a flow chart showing the configuration of the two record control means and 2B and the file extension control means 3A and 3B in FIG. Explanation of symbols: IA and IB are data processing devices. 2 and 2B are record control means, 3A and 3B are file expansion control means, 4A and 4B are rollback control means, 5A and 5B are extent information, 6A and 6B are jobs, 7 is a simultaneous access control device, and 8 is an external Storage device, 9 is 7-isle extent information, 10 is a file, 1o-1-≠: plO-2 and 10-3 are extents 2A, 2B.

Claims (1)

[Claims] 1. Comprising a plurality of data processing devices, an external storage device having files to be shared, and a simultaneous access control device for controlling simultaneous access to files shared among the plurality of data processing devices. , in a data processing system in which a job that outputs data in a shared file on the external storage device is executed in parallel on the plurality of data processing devices, the output requested based on a record output request from the job is executed. If the address of the block is outside the range of the file indicated by the extent information of the file registered in the data processing device, the above file extension control means is requested to extend the file, and the simultaneous access control device is requested to extend the block simultaneously. A record control means that outputs a record after requesting access control, and based on a file expansion request from the record control means, checks the extent information of the file on the data processing device and the file extent information on the external storage device. If the file has already been expanded, enter the file extent information on the external storage device and register it in the extent information of the file on the data processing device; if it has not been expanded, expand the file and store it on the external processing device. a file extension control means for re-registering extent information of a file on the data processing device; A simultaneous access and rollback control method comprising: rollback control means that does not roll back only extent information of files on a data processing device;