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workflow addenda
The concrete swineherd runnables each have eponymous stage names.
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CpRunner
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ScpRunner
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PigRunner
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HadoopRunner
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HadoopStreamingRunner
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WukongRubyRunner
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FlumeOgConfigRunner
Any simple Rake task should work as a swineherd flow
- task
- desc
- namespace
- ... (flesh out)
Can dispatch to another stage dynamically -- for instance, the FilenameRule
stage handles the familiar "build any .o
file from its eponymous .c
file" rule.
(?mystery: how to handle resolution order? Part of the unsolved specificity question-?)
Does not guarantee parallel execution -- just allows it
- many have an
updated_at
date, ornil
if it doesn't exist.
mystery: what about things without a meaningful date?
http://www.workflowpatterns.com/documentation/documents/phd_bartek.pdf
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Activity represents an atomic piece of work
- trigger conditions: any, all, custom
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Work Node -- once executed, not again until reset
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Merge Node
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Split Node
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Route Node
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Abort Node
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Reset Arc
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Parallel Split
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Synhronization
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XOR
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Simple Merge
- resource: an entity that is capable of doing work
- durable or consumable in nature
- resource may have a schedule and history associated with them
http://www.workflowpatterns.com/patterns/
In process-aware information systems various perspectives can be distinguished.
- The control-flow perspective captures aspects related to control-flow dependencies between various tasks (e.g. parallelism, choice, synchronization etc). ...
- The data perspective deals with the passing of information , scoping of variables, etc
- The resource perspective deals with resource to task allocation, delegation, etc.
- Finally, the patterns for the exception handling perspective deal with the various causes of exceptions and the various actions that need to be taken as a result of exceptions occurring.