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Posted to commits@beam.apache.org by "Ahmet Altay (JIRA)" <ji...@apache.org> on 2018/03/09 18:42:00 UTC

[jira] [Commented] (BEAM-3736) Add SetUp() and TearDown() for CombineFns

    [ https://issues.apache.org/jira/browse/BEAM-3736?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16393352#comment-16393352 ] 

Ahmet Altay commented on BEAM-3736:
-----------------------------------

Adding some relevant people to discussion:

cc: [~robertwb] [~lcwik] [~danoliveira] [~kenn]

> 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
>            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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