[jira] [Assigned] (BEAM-3293) Add lazy map side input form

["Jack McCluskey (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BEAM-3293?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jack McCluskey reassigned BEAM-3293:
------------------------------------

    Assignee: Jack McCluskey

> Add lazy map side input form
> ----------------------------
>
>                 Key: BEAM-3293
>                 URL: https://issues.apache.org/jira/browse/BEAM-3293
>             Project: Beam
>          Issue Type: Improvement
>          Components: sdk-go
>            Reporter: Henning Rohde
>            Assignee: Jack McCluskey
>            Priority: P3
>
> Add InputKinds LazyMap and LazyMultiMap that allow map lookup without reading everything to memory. They will be accessed through functions such as:
> func(K) func(*V) bool   (a keyed function that returns an iterator)
>  func(K) []V                         (a keyed function that returns a slice of values)
> On the execution layer, the new forms would need to be added to exec/sideinput.go
>  [https://github.com/apache/beam/blob/master/sdks/go/pkg/beam/core/runtime/exec/sideinput.go] 
>  The inputs layer, for the actual abstraction using reflection:
>  [https://github.com/apache/beam/blob/master/sdks/go/pkg/beam/core/runtime/exec/input.go]
> The funcx package would need to be updated to detect the new parameter forms 
>  [https://github.com/apache/beam/blob/master/sdks/go/pkg/beam/core/funcx/fn.go]
>  [https://github.com/apache/beam/blob/master/sdks/go/pkg/beam/core/funcx/sideinput.go]
> as well has the DoFn graph validation code
>  [https://github.com/apache/beam/blob/master/sdks/go/pkg/beam/core/graph/fn.go#L566]
> They would need to be correctly translated into the pipeline protos:
>  [https://github.com/apache/beam/blob/master/sdks/go/pkg/beam/core/runtime/graphx/translate.go#L315]
>  and finally back to the newly created handlers in the exec package. 
>  [https://github.com/apache/beam/blob/master/sdks/go/pkg/beam/core/runtime/exec/translate.go#L402]
> If implemented pre-generics, the code generator frontend, and backend would need to be updated to detect and generate code for efficient no-reflection overhead map access functions. [https://github.com/apache/beam/blob/master/sdks/go/pkg/beam/util/shimx/generate.go] 
>  [https://github.com/apache/beam/blob/master/sdks/go/pkg/beam/util/starcgenx/starcgenx.go]
> Unit must be added throughout and Integration tests should be added to verify the functionality against portable beam runners.
>  [https://github.com/apache/beam/tree/master/sdks/go/test/integration/primitives]
> And of course, the user GoDoc should be updated for the support.
> See this lengthy email response for a more indepth guide to how Side Inputs operate. [https://lists.apache.org/thread.html/ra42dc7ee30842f11740eff33f0afcd63702695878e427127e1268381%40%3Cdev.beam.apache.org%3E] 



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