[ 
https://issues.apache.org/jira/browse/BEAM-11097?focusedWorklogId=676491&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-676491
 ]

ASF GitHub Bot logged work on BEAM-11097:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 04/Nov/21 15:30
            Start Date: 04/Nov/21 15:30
    Worklog Time Spent: 10m 
      Work Description: jrmccluskey opened a new pull request #15896:
URL: https://github.com/apache/beam/pull/15896


   Creates a hook to enable cross-bundle side input caching, modifies behavior 
of the cache in the disabled case to avoid queries, and adjusts the harness to 
properly handle values from init hooks being included in the context.
   
   ------------------------
   
   Thank you for your contribution! Follow this checklist to help us 
incorporate your contribution quickly and easily:
   
    - [ ] [**Choose 
reviewer(s)**](https://beam.apache.org/contribute/#make-your-change) and 
mention them in a comment (`R: @username`).
    - [ ] Format the pull request title like `[BEAM-XXX] Fixes bug in 
ApproximateQuantiles`, where you replace `BEAM-XXX` with the appropriate JIRA 
issue, if applicable. This will automatically link the pull request to the 
issue.
    - [ ] Update `CHANGES.md` with noteworthy changes.
    - [ ] If this contribution is large, please file an Apache [Individual 
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   See the [Contributor Guide](https://beam.apache.org/contribute) for more 
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   `ValidatesRunner` compliance status (on master branch)
   --------------------------------------------------------
   
   <table>
     <thead>
       <tr>
         <th>Lang</th>
         <th>ULR</th>
         <th>Dataflow</th>
         <th>Flink</th>
         <th>Samza</th>
         <th>Spark</th>
         <th>Twister2</th>
       </tr>
     </thead>
     <tbody>
       <tr>
         <td>Go</td>
         <td>---</td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Go/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Go/lastCompletedBuild/badge/icon";>
           </a>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Go_VR_Flink/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Go_VR_Flink/lastCompletedBuild/badge/icon";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Go_VR_Samza/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Go_VR_Samza/lastCompletedBuild/badge/icon";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Go_VR_Spark/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Go_VR_Spark/lastCompletedBuild/badge/icon";>
           </a>
         </td>
         <td>---</td>
       </tr>
       <tr>
         <td>Java</td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_ULR/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_ULR/lastCompletedBuild/badge/icon";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Dataflow/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Dataflow/lastCompletedBuild/badge/icon?subject=V1";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Dataflow_Streaming/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Dataflow_Streaming/lastCompletedBuild/badge/icon?subject=V1+Streaming";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Dataflow_Java11/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Dataflow_Java11/lastCompletedBuild/badge/icon?subject=V1+Java+11";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Java_VR_Dataflow_V2/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Java_VR_Dataflow_V2/lastCompletedBuild/badge/icon?subject=V2";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Java_VR_Dataflow_V2_Streaming/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Java_VR_Dataflow_V2_Streaming/lastCompletedBuild/badge/icon?subject=V2+Streaming";>
           </a><br>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Flink/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Flink/lastCompletedBuild/badge/icon?subject=Java+8";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Flink_Java11/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Flink_Java11/lastCompletedBuild/badge/icon?subject=Java+11";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Java_PVR_Flink_Batch/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Java_PVR_Flink_Batch/lastCompletedBuild/badge/icon?subject=Portable";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Java_PVR_Flink_Streaming/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Java_PVR_Flink_Streaming/lastCompletedBuild/badge/icon?subject=Portable+Streaming";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Samza/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Samza/lastCompletedBuild/badge/icon";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Java_PVR_Samza/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Java_PVR_Samza/lastCompletedBuild/badge/icon?subject=Portable";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Spark/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Spark/lastCompletedBuild/badge/icon";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Java_PVR_Spark_Batch/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Java_PVR_Spark_Batch/lastCompletedBuild/badge/icon?subject=Portable";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_SparkStructuredStreaming/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_SparkStructuredStreaming/lastCompletedBuild/badge/icon?subject=Structured+Streaming";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Twister2/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Twister2/lastCompletedBuild/badge/icon";>
           </a>
         </td>
       </tr>
       <tr>
         <td>Python</td>
         <td>---</td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Py_VR_Dataflow/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Py_VR_Dataflow/lastCompletedBuild/badge/icon?subject=V1";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Py_VR_Dataflow_V2/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Py_VR_Dataflow_V2/lastCompletedBuild/badge/icon?subject=V2";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Py_ValCont/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Py_ValCont/lastCompletedBuild/badge/icon?subject=ValCont";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PreCommit_Python_PVR_Flink_Cron/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PreCommit_Python_PVR_Flink_Cron/lastCompletedBuild/badge/icon?subject=Portable";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Python_VR_Flink/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Python_VR_Flink/lastCompletedBuild/badge/icon";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Python_VR_Samza/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Python_VR_Samza/lastCompletedBuild/badge/icon";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Python_VR_Spark/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Python_VR_Spark/lastCompletedBuild/badge/icon";>
           </a>
         </td>
         <td>---</td>
       </tr>
       <tr>
         <td>XLang</td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_XVR_Direct/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_XVR_Direct/lastCompletedBuild/badge/icon";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_XVR_Dataflow/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_XVR_Dataflow/lastCompletedBuild/badge/icon";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_XVR_Flink/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_XVR_Flink/lastCompletedBuild/badge/icon";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_XVR_Samza/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_XVR_Samza/lastCompletedBuild/badge/icon";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_XVR_Spark/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_XVR_Spark/lastCompletedBuild/badge/icon";>
           </a>
         </td>
         <td>---</td>
       </tr>
     </tbody>
   </table>
   
   Examples testing status on various runners
   --------------------------------------------------------
   
   <table>
     <thead>
       <tr>
         <th>Lang</th>
         <th>ULR</th>
         <th>Dataflow</th>
         <th>Flink</th>
         <th>Samza</th>
         <th>Spark</th>
         <th>Twister2</th>
       </tr>
     </thead>
     <tbody>
       <tr>
         <td>Go</td>
         <td>---</td>
         <td>---</td>
         <td>---</td>
         <td>---</td>
         <td>---</td>
         <td>---</td>
         <td>---</td>
       </tr>
       <tr>
         <td>Java</td>
         <td>---</td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PreCommit_Java_Examples_Dataflow_Cron/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PreCommit_Java_Examples_Dataflow_Cron/lastCompletedBuild/badge/icon?subject=V1";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PreCommit_Java_Examples_Dataflow_Java11_Cron/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PreCommit_Java_Examples_Dataflow_Java11_Cron/lastCompletedBuild/badge/icon?subject=V1+Java11";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Java_Examples_Dataflow_V2/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Java_Examples_Dataflow_V2/lastCompletedBuild/badge/icon?subject=V2";>
           </a><br>
         </td>
         <td>---</td>
         <td>---</td>
         <td>---</td>
         <td>---</td>
         <td>---</td>
       </tr>
       <tr>
         <td>Python</td>
         <td>---</td>
         <td>---</td>
         <td>---</td>
         <td>---</td>
         <td>---</td>
         <td>---</td>
         <td>---</td>
       </tr>
       <tr>
         <td>XLang</td>
         <td>---</td>
         <td>---</td>
         <td>---</td>
         <td>---</td>
         <td>---</td>
         <td>---</td>
         <td>---</td>
       </tr>
     </tbody>
   </table>
   
   Post-Commit SDK/Transform Integration Tests Status (on master branch)
   
------------------------------------------------------------------------------------------------
   
   <table>
     <thead>
       <tr>
         <th>Go</th>
         <th>Java</th>
         <th>Python</th>
       </tr>
     </thead>
     <tbody>
       <tr>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Go/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Go/lastCompletedBuild/badge/icon";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Java/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Java/lastCompletedBuild/badge/icon";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Python36/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Python36/lastCompletedBuild/badge/icon?subject=3.6";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Python37/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Python37/lastCompletedBuild/badge/icon?subject=3.7";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PostCommit_Python38/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PostCommit_Python38/lastCompletedBuild/badge/icon?subject=3.8";>
           </a>
         </td>
       </tr>
     </tbody>
   </table>
   
   Pre-Commit Tests Status (on master branch)
   
------------------------------------------------------------------------------------------------
   
   <table>
     <thead>
       <tr>
         <th>---</th>
         <th>Java</th>
         <th>Python</th>
         <th>Go</th>
         <th>Website</th>
         <th>Whitespace</th>
         <th>Typescript</th>
       </tr>
     </thead>
     <tbody>
       <tr>
         <td>Non-portable</td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PreCommit_Java_Cron/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PreCommit_Java_Cron/lastCompletedBuild/badge/icon";>
           </a><br>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PreCommit_Python_Cron/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PreCommit_Python_Cron/lastCompletedBuild/badge/icon?subject=Tests";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PreCommit_PythonLint_Cron/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PreCommit_PythonLint_Cron/lastCompletedBuild/badge/icon?subject=Lint";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PreCommit_PythonDocker_Cron/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PreCommit_PythonDocker_Cron/badge/icon?subject=Docker";>
           </a><br>
           <a 
href="https://ci-beam.apache.org/job/beam_PreCommit_PythonDocs_Cron/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PreCommit_PythonDocs_Cron/badge/icon?subject=Docs";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PreCommit_Go_Cron/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PreCommit_Go_Cron/lastCompletedBuild/badge/icon";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PreCommit_Website_Cron/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PreCommit_Website_Cron/lastCompletedBuild/badge/icon";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PreCommit_Whitespace_Cron/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PreCommit_Whitespace_Cron/lastCompletedBuild/badge/icon";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PreCommit_Typescript_Cron/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PreCommit_Typescript_Cron/lastCompletedBuild/badge/icon";>
           </a>
         </td>
       </tr>
       <tr>
         <td>Portable</td>
         <td>---</td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PreCommit_Portable_Python_Cron/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PreCommit_Portable_Python_Cron/lastCompletedBuild/badge/icon";>
           </a>
         </td>
         <td>
           <a 
href="https://ci-beam.apache.org/job/beam_PreCommit_GoPortable_Cron/lastCompletedBuild/";>
             <img alt="Build Status" 
src="https://ci-beam.apache.org/job/beam_PreCommit_GoPortable_Cron/lastCompletedBuild/badge/icon";>
           </a>
         </td>
         <td>---</td>
         <td>---</td>
         <td>---</td>
       </tr>
     </tbody>
   </table>
   
   See 
[.test-infra/jenkins/README](https://github.com/apache/beam/blob/master/.test-infra/jenkins/README.md)
 for trigger phrase, status and link of all Jenkins jobs.
   
   
   GitHub Actions Tests Status (on master branch)
   
------------------------------------------------------------------------------------------------
   [![Build python source distribution and 
wheels](https://github.com/apache/beam/workflows/Build%20python%20source%20distribution%20and%20wheels/badge.svg?branch=master&event=schedule)](https://github.com/apache/beam/actions?query=workflow%3A%22Build+python+source+distribution+and+wheels%22+branch%3Amaster+event%3Aschedule)
   [![Python 
tests](https://github.com/apache/beam/workflows/Python%20tests/badge.svg?branch=master&event=schedule)](https://github.com/apache/beam/actions?query=workflow%3A%22Python+Tests%22+branch%3Amaster+event%3Aschedule)
   [![Java 
tests](https://github.com/apache/beam/workflows/Java%20Tests/badge.svg?branch=master&event=schedule)](https://github.com/apache/beam/actions?query=workflow%3A%22Java+Tests%22+branch%3Amaster+event%3Aschedule)
   
   See [CI.md](https://github.com/apache/beam/blob/master/CI.md) for more 
information about GitHub Actions CI.
   


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

    Worklog Id:     (was: 676491)
    Time Spent: 12h 50m  (was: 12h 40m)

> [Go SDK] Windowed Side Input Caching (Cross Bundle)
> ---------------------------------------------------
>
>                 Key: BEAM-11097
>                 URL: https://issues.apache.org/jira/browse/BEAM-11097
>             Project: Beam
>          Issue Type: Improvement
>          Components: sdk-go
>            Reporter: Robert Burke
>            Assignee: Jack McCluskey
>            Priority: P3
>              Labels: starter
>          Time Spent: 12h 50m
>  Remaining Estimate: 0h
>
> This is implementing https://issues.apache.org/jira/browse/BEAM-5428 for the 
> Go SDK.
> Side inputs are valid for given window. That means they can be and correctly 
> cached and re-used in multiple bundles if the data has already been loaded 
> into a given worker.
> Side input data for a given bundle is specified and keyed by the window and a 
> a side input request token. The Go SDK presently doesn't use this information 
> for a SDK side worker cache of data.
> Care needs to be taken to allow the data to be garbage collected if it hasn't 
> been used in the last minute or so. In practice, Global Window side inputs 
> will not be evicted while still in use, but infrequently accessed data will 
> possibly be evicted more regularly. A limit should be set to avoid running 
> out of memory.
> As presently implemented, each ProcessElement call (or StartBundle or 
> FinishBundle) will only query for side input data on user request. However, 
> results of user requests are not cached between elements or bundles, which 
> means there's additional lookup and serialization time from the runner side.
> It may be possible to re-use allocated side input elements, but even a 
> solution that re-decodes data on every call would be an improvement if the 
> data isn't re-streamed from the runner.
> If https://issues.apache.org/jira/browse/BEAM-3293 has been implemented, then 
> per-key+window caching should additionally be considered for more granular 
> caching of data.
> This optimization has an outsized impact on streaming performance as side 
> input data can change per bundle, and streaming bundles are typically small, 
> and quickly processed.
> This work would be implemented in the exec package: 
>  
> [https://github.com/apache/beam/blob/master/sdks/go/pkg/beam/core/runtime/exec/sideinput.go]
>  
>  and probably the harness package
>  
> [https://github.com/apache/beam/blob/c185adb7652034b5d044aae65a1a972d9ceb4377/sdks/go/pkg/beam/core/runtime/harness/statemgr.go#L50]



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