JP5359234B2 - Job execution system and job flow takeover control program - Google Patents

Description

The present invention relates to a job execution system and a job flow takeover control program, and is suitable for use when taking over job flow control by an active server to a standby server in an emergency such as when a natural disaster occurs. The present invention relates to a job execution system and a job flow takeover control program.

  In a job execution system having a job execution server that sequentially executes a job that is a unit of work of a computer, an active server that submits the job to the job execution server and executes it in a normal state; In addition, a standby server that is reserved in the normal state is provided for the same active server, and is configured to be duplicated in order to cope with a system down when a large-scale disaster occurs, for example. There is something.

  As shown in FIG. 7, for example, this type of job execution system includes an active server 10, a standby server 20, a schedule information storage unit 31, a job flow information storage unit 32, and system switching units 41 and 42. , And job execution servers 50 and 60. The active server 10 includes a schedule determination unit 11 and a job flow control unit 12. The standby server 20 includes a schedule determination unit 21 and a job flow control unit 22. The job execution server 50 includes a job execution unit 51 and a job execution status information recording unit 52. The job execution server 60 includes a job execution unit 61 and a job execution status information recording unit 62.

  In this job execution system, date and time information for each job execution server 50 and 60 to execute a job is stored in advance as schedule information in the schedule information storage unit 31, and the job execution information is stored in the job flow information storage unit 32. The order and execution server are stored in advance as job flow information. In the active server 10, the schedule determination unit 11 determines whether there is a job flow to be activated based on the schedule information stored in the schedule information storage unit 31, and the job flow for activation is determined. In some cases (that is, when it is time to execute a job), a job flow submission request is made. The job flow control unit 12 specifies the job execution order and execution server based on the job flow information stored in the job flow information storage unit 32 when a job flow input request is made from the schedule determination unit 11. Then, the corresponding job is input to the job execution servers 50 and 60 via the system switching units 41 and 42, and the job end notification from each job execution server 50 and 60 is waited for. If there is a subsequent job, the job to be executed next is determined and submitted.

  In each of the job execution servers 50 and 60, the job execution units 51 and 61 start the execution of the job input from the job flow control unit 12, and at the end of the same job, the end of the job is terminated by the job flow control unit 12. Will be notified. The job execution status information recording units 52 and 62 record job execution status information (start, executing, and end) of jobs executed by the job execution units 51 and 61. The system switching unit 41 is controlled by a system switching signal sc and connects each job execution server 50 and the job flow control unit 12 of the active server 10 in the normal state. The job execution servers 50 and 60 are connected to the job flow control unit 22 of the standby server 20. The system switching unit 42 connects each job execution server 60 and the job flow control unit 12 of the active server 10 in the normal state, and waits for each job execution server 60 in the system switching state. The job flow control unit 22 of the system server 20 is connected. When the system is down at the active server 10 and the system is switched to the standby server 20, the schedule determination unit 21 performs the same operation as the schedule determination unit 11 of the active server 10 and the job flow. The control unit 22 performs the same operation as the job flow control unit 12 of the active server 10.

In addition to the job execution system described above, this type of related technique includes, for example, a delay factor analysis method in a job system described in Patent Document 1.
In this analysis method, the execution history of jobs is collected from each job execution computer by the management manager computer, and until the job delay is not detected sequentially from the job executed later to the job executed earlier, The history of each job is referred to, and the cause of the delay in each job is determined.

  In the failure host job continuation control method described in Patent Document 2, the job is executed according to the schedule definition by the schedule execution means, and the job specified after receiving the job restart instruction is the job schedule. It is executed according to The job operation history writing unit records information related to job start and stop by the schedule execution unit obtained through the job start / stop recognition unit in a job operation history recording file that is a shared file. The job operation history reading unit reads information about the job start and stop operations of the system interrupted host obtained from the job operation history recording file via the other host failure recognition unit. The job operation state determination means outputs a job restart instruction when the system is interrupted from information related to the start and stop operations of the system interrupt host.

Further, in the system for minimizing data loss in the computer application described in Patent Document 3, when a failure occurs in the system, in response to the failure, the program is stored on a known code path indicating the storage and / or termination of the program. The program execution is redirected, the program is suspended, the fault is repaired and restored, and the fault is tolerated by taking a snapshot of the application state in preparation for a restore after the application fault.
Japanese Unexamined Patent Publication No. 2000-231502 (Abstract, FIG. 1) Japanese Patent Laid-Open No. 06-124214 (Abstract, FIG. 1) JP 2008-507767 (abstract, Fig. 1)

However, the above techniques including the technique described in the above document have the following problems.
That is, in the job execution system of FIG. 7, the active server 10 and the standby server 20 may be remotely located from each other, but the schedule information storage unit 31 and the job flow information storage unit 32 are shared, and the network Therefore, it is difficult to take over job execution status information from the active server 10 to the standby server 20 in a system switching state because the load on the network increases. In addition, if execution status information cannot be taken over, it is necessary for the operator to check the individual job execution status in the job flow and determine the execution restart point in the job flow, which is troublesome. .

  In addition, in the delay factor analysis method described in Patent Document 1, a delay is detected by the job system. However, since the execution of the job flow is not taken over, the above problem is not improved, and an opportunity to collect information is obtained. However, the operation is different only when switching between the active system and the standby system.

  In the continuation control method described in Patent Document 2, since a shared file is used, it is not possible to cope with system switching at a remote place where the file cannot be shared, and thus the above problem is not improved.

  The system for minimizing data loss described in Patent Document 3 has a function of minimizing data loss and does not switch jobs. Whether or not to restart the application is determined, but it does not determine whether or not the job flow is restarted, and the above problem is not improved.

The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a job execution system and a job flow takeover control program for smoothly taking over control of job flow by an active server to a standby server.

In order to solve the above problems, a first configuration of the present invention includes one or a plurality of job execution servers for executing a submitted job, and jobs corresponding to the job execution servers in a normal state. Is connected to the active server, the standby server that is reserved for the active server in the normal state, and the job execution server and the active server are connected in the normal state. Meanwhile, when it becomes the system switching state, relates to the job execution system for chromatic and system switching section for connecting the respective job execution server and the standby server, the operating system server, wherein each job execution server job Is stored in the first schedule information storage unit in which the date and time for executing is stored in advance as schedule information, and in the first schedule information storage unit Based on the schedule information, it is determined whether or not there is a job flow to be activated. If there is a job flow to be activated, a first schedule determination unit that makes a job flow submission request, When the job flow input request is made from the first job flow information storage unit in which the execution order and the execution server are stored in advance as job flow information, and the first schedule determination unit, the first job Based on the job flow information stored in the flow information storage unit, the execution order of the jobs and the execution server are specified, and the corresponding job is submitted to each job execution server. Wait for the job end notification, determine whether the job is the last job in the job flow, A first job flow control unit that determines and submits a job to be executed next when the job exists, and each of the job execution servers is submitted from the first job flow control unit A job execution unit that starts job execution and notifies the first job flow control unit of the end of the job at the end of the job, and records job execution status information of the job input to the job execution unit A second schedule information storage unit in which the same schedule information as that of the first schedule information storage unit of the active server is stored in advance. Based on the schedule information stored in the second schedule information storage unit, it is determined whether there is a job flow to be activated and If there is a job flow for a job flow, the same job flow information as that of the second schedule determination unit that makes a job flow submission request and the first job flow information storage unit of the active server is stored in advance. A job being executed in the job flow by collecting the job execution status information from the second job flow information storage unit and the job execution status information recording unit of each job execution server when the system switching state is entered. A job flow takeover unit that determines the job flow, and a notification of the job being executed determined by the job flow takeover unit, and submits the job to the corresponding job execution server to instruct the continuation of the job execution And a second job flow control unit .

  According to the configuration of the present invention, it is possible to smoothly transfer the job input to each job execution server from the active server to the standby server.

  Each job execution server is configured to record at least job execution status information indicating the start, execution, or end of the job, and the standby server is configured so that each job execution server is in the above system switching state while the job is being executed. The job execution status information is collected from each job execution server, the job flow restart location is determined based on the job execution status information, and the job execution server is restarted from the restart location. Provided is a job execution system provided with job execution takeover instruction means for instructing continuation of job execution. According to the configuration of the present invention, job execution status information is recorded in each job execution server, and when each job execution server is in a system switching state during execution of the job, each job execution is executed by the standby server. Job execution status information is collected from the server, the job flow restart location is determined based on the job execution status information, and each job execution server is instructed to continue job execution from the restart location. In addition, the job input to each job execution server can be smoothly transferred from the active server to the standby server without using a shared disk device or the like.

  According to a preferred aspect of the present invention, the active server includes a first schedule information storage unit in which a date and time for each job execution server to execute a job is stored in advance as schedule information; Based on the schedule information stored in the schedule information storage unit, it is determined whether there is a job flow to be activated, and if there is a job flow to be activated, a job flow input request is made. The job flow input request is made from the first schedule determination unit, the first job flow information storage unit in which the job execution order and execution server are stored in advance as job flow information, and the schedule determination unit. The job flow based on the job flow information stored in the job flow information storage unit. Specify the execution order and execution server, submit the corresponding job to each job execution server, wait for the job end notification from each job execution server, and whether the job is the last job in the job flow A first job flow control unit that determines and submits a job to be executed next when a subsequent job exists, and each of the job execution servers submits from the job flow control unit A job execution unit that starts the execution of the job executed and notifies the job flow control unit of the end of the job when the job ends, and records the job execution status information of the job executed by the job execution unit The standby server is the same schedule as the first schedule information storage unit of the active server. Based on the second schedule information storage unit in which the schedule information is stored in advance and the schedule information stored in the second schedule information storage unit, it is determined whether there is a job flow to be activated. If there is a job flow to be started, the same job flow information as that of the second schedule determination unit that makes a job flow input request and the first job flow information storage unit of the active server is stored in advance. A second job flow information storage unit that stores the job execution takeover instructing means from the job execution status information recording unit of each job execution server when the system switching state is entered. The job flow takeover unit that collects execution status information and determines the job being executed in the job flow, and the job flow takeover unit A second job flow control unit that receives the determined notification of the job being executed, inputs the job to the corresponding job execution server, and instructs the continuation of the job execution;

  In a preferred embodiment of the present invention, the job flow takeover unit collects the job execution status information from the job execution status information recording unit of each job execution server when the system switching state is entered. A status information collection unit; and an execution resumption location determination unit that determines a resumption location of a job being executed based on the job execution status information collected by the job execution status information collection unit. The job flow control unit is configured to cause each job execution server to continue the execution of the job from the restart point of the job being executed determined by the execution restart point determination unit.

  According to a preferred aspect of the present invention, when the job execution status information collecting unit is in the system switching state, the job execution status information recording unit of each job execution server includes the job execution status information of the job execution status information. It is configured to preferentially collect information on running jobs.

  In a preferred embodiment of the present invention, an execution resumption location confirmation unit for presenting and confirming the resumption location of the job being executed determined by the execution resumption location determination unit to the administrator of the job execution system. Is provided.

Embodiment 1

FIG. 1 is a block diagram showing the electrical configuration of the main part of the job execution system according to the first embodiment of the present invention.
As shown in FIG. 1, the job execution system of this embodiment includes an active server 70, a standby server 80, system switching units 91 and 92, and job execution servers 100 and 110. The job execution servers 100 and 110 execute the submitted job. In the normal state, the active server 70 submits the corresponding job to the job execution servers 100 and 110 for execution. The standby server 80 becomes a spare in a normal state with respect to the active server 70. The system switching units 91 and 92 are controlled by a system switching signal sc and connect the job execution servers 100 and 110 to the active server 70 in the normal state, while executing the job when the system switching state is established. The servers 100 and 110 and the standby server 80 are connected. The system switching signal sc is input by an administrator of the job execution system, for example.

  In particular, in this embodiment, the active server 70 includes a schedule information storage unit 71, a job flow information storage unit 72, a schedule determination unit 73, and a job flow control unit 74. The schedule information storage unit 71 is composed of, for example, a RAM (Random Access Memory) and the like, and the date and time for the job execution servers 100 and 110 to execute jobs is stored in advance as schedule information. The job flow information storage unit 72 is composed of, for example, a RAM and the like, and the job execution order and the execution servers 100 and 110 are stored in advance as job flow information.

  The schedule determination unit 73 determines whether there is a job flow to be activated based on the schedule information stored in the schedule information storage unit 71, and if there is a job flow to be activated (that is, a job When it is time to execute (), a job flow submission request is made. When a job flow input request is made from the schedule determination unit 73, the job flow control unit 74 determines the job execution order and the execution server 100, based on the job flow information stored in the job flow information storage unit 72. 110 is specified. Then, the job flow control unit 74 submits the corresponding job to each job execution server 100, 110, waits for a job end notification from each job execution server 100, 110, and the job is the last in the job flow. It is determined whether the job is a job, and when there is a subsequent job, the job to be executed next is determined and submitted.

  The job execution server 100 includes a job execution unit 101 and a job execution status information recording unit 102. The job execution unit 101 starts executing the job input from the job flow control unit 74 and notifies the job flow control unit 74 of the end of the job when the job ends. The job execution status information recording unit 102 records job execution status information (start, executing, end) of the job executed by the job execution unit 101. The job execution server 110 includes a job execution unit 111 and a job execution status information recording unit 112. The job execution unit 111 starts execution of the job input from the job flow control unit 74 and notifies the job flow control unit 74 of the end of the job when the job ends. The job execution status information recording unit 112 records job execution status information (start, executing, end) of the job executed by the job execution unit 111.

  The standby server 80 includes a schedule information storage unit 81, a job flow information storage unit 82, a schedule determination unit 83, a job flow control unit 84, and a job flow takeover unit 85. The schedule information storage unit 81 stores the same schedule information as the schedule information storage unit 71 of the active server 70 in advance. The job flow information storage unit 82 stores the same job flow information as the job flow information storage unit 72 of the active server 70 in advance. The schedule determination unit 83 determines whether there is a job flow to be activated based on the schedule information stored in the schedule information storage unit 81, and if there is a job flow to be activated (that is, a job When it is time to execute (), a job flow submission request is made.

  The job flow takeover unit 85 is controlled by the system switching signal sc, and collects job execution status information from the job execution servers 100 and 110 when the job execution servers 100 and 110 are in the system switching state during job execution. The job flow resumption point is determined based on the job execution status information. In particular, in this embodiment, the job flow takeover unit 85 includes a job execution status information collection unit 85a, an execution restart point determination unit 85b, a CPU (Central Processing Unit) 85c, and a ROM (Read Only Memory) 85d. Has been. The job execution status information collection unit 85a collects the job execution status information from the job execution status information recording units 102 and 112 of the job execution servers 100 and 110 when the system switching state is entered. The information on the job being executed in the job execution status information is preferentially collected. The execution resumption point determination unit 85b determines a resumption point (resumption location) of the job being executed based on the job execution status information collected by the job execution status information collection unit 85a. The CPU 85c is a computer that controls the entire job flow takeover unit 85, and the ROM 85d stores a job flow takeover control program for operating the CPU 85c. The job flow control unit 84 causes the job execution servers 100 and 110 to continue execution of the job from the restart point of the job being executed determined by the execution restart point determination unit 85b of the job flow takeover unit 85. The job flow takeover unit 85 and job flow control unit 84 constitute job execution takeover instruction means.

2 is a flowchart for explaining the operation of the schedule determination unit 73, FIG. 3 is a flowchart for explaining the operation of the job flow control unit 74, and an operation explanatory diagram. FIG. 4 is for explaining the operation of the job execution units 101 and 111. FIG. 5 is a flowchart and an operation explanatory diagram for explaining the operation of the job flow takeover unit 85.
The processing contents of the job flow takeover method used in the job execution system of this embodiment will be described with reference to these drawings.
In this job execution system, in a normal state, the active server 70 inputs a corresponding job to the job execution servers 100 and 110. In the job execution servers 100 and 110, the submitted job is executed. The standby server 80 is reserved for the active server 70 in a normal state. In the normal state, the job switching servers 91 and 92 are connected to the active server 70 by the system switching units 91 and 92. On the other hand, in the system switching state, the job execution servers 100 and 110 and the standby server 80 are connected. And are connected. In the job execution servers 100 and 110, job execution status information indicating the start, execution or end of the job is recorded. When the job execution servers 100 and 110 are in a system switching state during job execution, the standby server 80 collects job execution status information from the job execution servers 100 and 110, and based on the job execution status information The job flow resumption point is determined, and the job execution servers 100 and 110 are instructed to continue job execution from the resumption point (job execution takeover instruction processing).

  That is, as shown in FIG. 2, the schedule determination unit 73 reads schedule information from the schedule information storage unit 71 (step A1), and determines whether there is a job flow for starting from the defined date and time information. If it is determined (step A2) and there is a job flow to be activated, the job flow control unit 74 is requested to input the job flow (step A3). At this time, date / time information (that is, information indicating when the job flow is executed) is given to the job flow input request.

  As shown in FIG. 3A, the job flow control unit 74 reads job flow information from the job flow information storage unit 72 (step B1), and determines a job to be executed in the job flow (step B2). ). A job execution server to which the job is to be input is specified, and the job is input to the server (step B3). Thereafter, the end of the input job is awaited (step B4). After waiting for completion, it is determined whether or not the job is the last job in the job flow (step B5). If there is a subsequent job, the job to be executed next is determined and submitted. . In this case, as shown in FIG. 3B, in the job flow 1, the job execution server 100 executes the job from the first job (job) 1 at the schedule time “12:00”, and after the job 1 is completed. The job execution server 110 is in a state where JOB2 is “being executed”. In the job execution server 100, JOB3 is not executed.

  In the job execution servers 100 and 110, as shown in FIG. 4A, the job execution units 101 and 111 accept the input of the job (step C1), and the execution of the job is started (step C2). The start of execution is recorded in the job execution status information recording units 102 and 112 (step C3). Thereafter, the job completion is waited. When the job is completed, the job flow control unit 74 is notified of the completion (step C4), and the completion is recorded in the job execution status information recording units 102 and 112. (Step C5). In this case, as shown in FIG. 4B, after JOB1 by the job execution server 100 is completed, JOB2 by the job execution server 110 is in the “execution” state, and the job execution server 100 does not execute JOB3. As shown in FIG. 4C, in the job flow 1, information on the completed JOB1 is recorded in the job execution status information recording unit 102 of the job execution server 100, and FIG. As shown in FIG. 6, information on the job 2 being executed is recorded in the job execution status information recording unit 112 of the job execution server 110.

  In the job flow takeover unit 85, as shown in FIG. 5A, the job execution status information collection unit 85a collects only information on the job being executed from the job execution servers 100 and 110 (step D1). Based on the job execution status information collected by the job execution status information collection unit 85a, the execution restart point determination unit 85b determines the resume point of the job being executed in the job flow (step D2). The determined job resumption point is notified to the job flow control unit 84. Then, the job flow control unit 84 causes the job execution servers 100 and 110 to continue the execution of the job from the restart point of the job being executed determined by the execution restart point determination unit 85b. Thereafter, information other than the job being executed is also collected by the job execution status information collection unit 85a (step D3) and is reflected and determined in the state of each job in the job flow (step D4). The job flow takeover unit 85 determines the status of each job based on the collected job execution status information, and continues execution from the job being executed. In this form, as shown in FIG. 5B, since JOB2 is being executed, execution is inherited from JOB2.

  As described above, in the first embodiment, when job execution status information is recorded in the job execution servers 100 and 110 and the job execution servers 100 and 110 are in a system switching state during job execution, The standby server 80 collects job execution status information from the job execution servers 100 and 110, determines a job flow resumption point based on the job execution status information, and sends the job execution status information to the job execution servers 100 and 110. Since the job execution is instructed from the restart point, the job input to the job execution servers 100 and 110 is smoothly transferred from the active server 70 to the standby server 80 without using a shared disk device or the like. . In addition, when the system switching state is entered, the job execution status information collecting unit 85a preferentially collects information on the job being executed in the job execution status information, so job execution required in the system switching status is performed. Status information is carried over in a short time.

Embodiment 2

FIG. 6 is a block diagram showing an electrical configuration of the job execution system according to the second embodiment of the present invention. Elements common to those in FIG. 1 showing the first embodiment are denoted by common reference numerals. It is attached.
In the job execution system of this form, as shown in FIG. 6, a standby server 80A to which a new function is added is provided instead of the standby server 80 in FIG. In the standby server 80A, in addition to the configuration of the standby server 80, an execution restart point confirmation unit 86 is provided. The execution resumption point confirmation unit 86 is configured by, for example, a liquid crystal display device, and presents the resumption point of the job being executed determined by the resumption point determination unit 85b to the administrator of the job execution system for confirmation. belongs to.

  In this job execution system, since the restart point of the job being executed determined by the restart point determination unit 85b is presented to the system administrator by the execution restart point confirmation unit 86, the administrator can easily restart the job. Points can be confirmed, and whether or not to take over can be selected depending on the actual job flow or job execution status at the time of system switchover.

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to the embodiment, and even if there is a design change without departing from the gist of the present invention, Included in the invention.
For example, the system switching signal sc is input by the administrator in each of the above embodiments. However, for example, when a natural disaster occurs, the system switching signal sc may be supplied via a communication line from the Japan Meteorological Agency or the like. It may be supplied from a detecting device (for example, a seismometer).

  The present invention provides a dual server having an active server that submits and executes a corresponding job to each job execution server in a normal state, and a standby server that becomes a backup in the normal state for the active server. It can be applied to all job execution systems with a structured configuration.

1 is a block diagram illustrating an electrical configuration of a main part of a job execution system according to a first embodiment of the present invention. 7 is a flowchart illustrating the operation of a schedule determination unit 73. FIG. 7 is a flowchart for explaining the operation of a job flow control unit 74 and an operation explanatory diagram. FIG. 6 is a flowchart for explaining the operation of job execution units 101 and 111 and an operation explanatory diagram. FIG. 6 is a flowchart for explaining the operation of a job flow takeover unit 85 and an operation explanatory diagram. It is a block diagram which shows the electric constitution of the job execution system which is 2nd Embodiment of this invention. It is a block diagram which shows the electrical structural example of a job execution system.

Explanation of symbols

70 Active server (part of job execution system)
71, 81 Schedule information storage unit 72, 82 Job flow information storage unit 73, 83 Schedule determination unit 74 Job flow control unit 80, 80A Standby server (part of job execution system)
84 Job flow control unit (part of job execution takeover instruction means)
85 Job flow takeover part (part of job execution takeover instruction means)
85a Job execution status information collection unit 85b Execution resume point determination unit 85c CPU (central processing unit)
85d ROM (Read Only Memory)
86 Execution restart point confirmation unit (execution restart point determination unit)
91,92 System switching unit (part of job execution system)
100, 110 Job execution server (part of job execution system)
101, 111 Job execution unit 102, 112 Job execution status information recording unit

Claims (5)

One or more job execution servers that execute submitted jobs;
In the normal state, an active server that submits and executes the corresponding job to each job execution server, and
A standby server serving as a backup in the normal state with respect to the active server;
In the normal state, the job execution server is connected to the active server, and when the system is switched to a system switching unit that connects the job execution server and the standby server. A job execution system that
The active server is
A first schedule information storage unit in which the date and time for each job execution server to execute a job is stored in advance as schedule information;
Based on the schedule information stored in the first schedule information storage unit, it is determined whether or not there is a job flow to be activated. If there is a job flow to be activated, the job flow is input. A first schedule determination unit for making a request;
A first job flow information storage unit in which job execution order and execution servers are stored in advance as job flow information;
When a job flow submission request is made from the first schedule determination unit, the job execution order and execution server are based on the job flow information stored in the first job flow information storage unit. And submits the corresponding job to each job execution server, waits for a job end notification from each job execution server, and determines whether the job is the last job in the job flow. A first job flow control unit that determines and submits a job to be executed next when there is a subsequent job,
Each of the job execution servers is
A job execution unit that starts execution of a job input from the first job flow control unit and notifies the first job flow control unit of the end of the job when the job ends;
A job execution status information recording unit that records job execution status information of a job submitted to the job execution unit,
The standby server is
A second schedule information storage unit in which the same schedule information as the first schedule information storage unit of the active server is stored in advance;
Based on the schedule information stored in the second schedule information storage unit, it is determined whether there is a job flow to be activated. If there is a job flow to be activated, the job flow is input. A second schedule determination unit for making a request;
A second job flow information storage unit that stores in advance the same job flow information as the first job flow information storage unit of the active server;
A job flow takeover unit that collects the job execution status information from the job execution status information recording unit of each job execution server and determines an executing job in the job flow when the system switching state is entered;
A second job flow control unit that receives the notification of the job being executed determined by the job flow takeover unit, inputs the job to the corresponding job execution server, and instructs the continuation of the execution of the job; job execution system characterized in that it comprises a. The job flow takeover part is
A job execution status information collection unit that collects the job execution status information from the job execution status information recording unit of each job execution server when the system switching state is entered;
Based on the job execution status information collected by the job execution status information collection unit, an execution restart point determination unit that determines a restart point of a job being executed,
The second job flow control unit
Job execution system according to claim 1, characterized in that it is configured to continue execution of the job to the each job execution server from resuming point of the job of the execution resumption point the running as determined at decision section . The job execution status information collection unit
When the system switching state is entered, the job execution status information recording unit of each job execution server is configured to preferentially collect information on the job being executed in the job execution status information. The job execution system according to claim 2, wherein: An execution resumption location confirmation unit is provided for presenting and confirming the resumption location of the job being executed determined by the execution resumption location determination unit to an administrator of the job execution system. Item 4. The job execution system according to Item 2 or 3 . A control program for causing a computer to function as the job execution system according to claim 1, 2, 3 or 4 .

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