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 first completed implementation in the new refactorised scoreboarding code is a scheme for checkpointing and crash-recovery of the scoreboards and alignment of the scoreboarding with regular clock-hours/day-periods. Both of these improvements are discussed below:

*{+}CheckPointing{+}*

In order to implement check-pointing, I save the state of the scoreboards to disk, while processing the scoreboards for each flow-file. When the program starts for the first time, it checks for checkpoints on disk before starting the scoreboading of every direction and if a checkpoint is present it unmarshalls the data from the checkpoint and starts updating the scoreboards from that point on.

The first issue was how to save the state to disk. I decided to go with marshalling and saving the part of the [nested hash structure |http://users.telenet.be/jurgen.kobierczynski/jkflow/mylist.pdf] containing the current scoreboard to disk. Specifically, mylist{direction}{$direction}{scoreboard}{aggregate}{report} points to an array of nested hash strcutures.

I am using a module written