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

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BEAM-3736?focusedWorklogId=506811&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-506811 ]

ASF GitHub Bot logged work on BEAM-3736:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 03/Nov/20 13:48
            Start Date: 03/Nov/20 13:48
    Worklog Time Spent: 10m 
      Work Description: kamilwu commented on pull request #13048:
URL: https://github.com/apache/beam/pull/13048#issuecomment-721081207






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Issue Time Tracking
-------------------

    Worklog Id:     (was: 506811)
    Time Spent: 9h  (was: 8h 50m)

> 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: Kamil Wasilewski
>            Priority: P3
>          Time Spent: 9h
>  Remaining Estimate: 0h
>
> 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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