Ahmet Altay updated BEAM-3736:
    Component/s: beam-model

> Add SetUp() and TearDown() for CombineFns
> -----------------------------------------
>                 Key: BEAM-3736
>                 URL: https://issues.apache.org/jira/browse/BEAM-3736
>             Project: Beam
>          Issue Type: Improvement
>          Components: beam-model, sdk-py-core
>            Reporter: Chuan Yu Foo
>            Assignee: Ahmet Altay
>            Priority: Major
> I have a CombineFn that has a large amount of state that needs to be loaded 
> once before it can add_input or merge_combiners (for example, the CombineFn 
> might load up a large lookup table used for combining). 
> Right now, to initialise this state, for each of the methods, I check if the 
> state has already been initialised, and if not, I initialise it. It would be 
> nice if CombineFn provided a SetUp() method that is called once to initialise 
> this state (and a corresponding TearDown() method to clean up this state if 
> necessary).

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