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This means that you have to clear out the log records before you can even attempt to run the job again.

Namespaces

In case you want to run the same job in parallel and want to automate automatic try/retry scenarios (across a set of parallel servers for example) you can assign a unique value to a parameter, defined in the job.  This parameter can then be selected as the "name space parameter". 

For example, while processing files in parallel you can process the file in a job in parallel with other files.  A FILENAME parameter can then be used to separate one file from the other.  If a file already was processed and encountered an error it will be retried.

Ignoring the last checkpoint

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