java - JSR 352 Restarting a job? -

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when job restarted, failed partitions run again. how run completed job again?

is there difference between submitting job again , restarting job?

i using ibm's implementation of jsr 352 on websphere liberty.

java batch designed when restart job instance, execution continues left off (in previous failed or stopped execution).

so typically means 2 things:

  1. within job, begin @ previously-failing step (or step @ job stopped).
  2. within step, begin positioning input cursor using checkpoint values kept batch container.

so if on initial execution completed step1 failed @ step2 @ record #4123, , checkpointing every 100 records, on restart you'd typically begin executing @ step2 @ record #4100.

in cases it's necessary execute step1 on restart well, before executing step2 job had failed, , there option behavior well.

it typical submit/start job repeatedly, on schedule.

in terms of batch specification, new jobinstance created each time job started. @ time initial jobexecution jobinstance created. if execution not run completion, instance may restarted, @ time second jobexecution created jobinstance.

so restart uses checkpoints , execution history of previous jobexecution while start begins clean slate.


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