[ 
https://issues.apache.org/jira/browse/BEAM-12818?focusedWorklogId=643365&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-643365
 ]

ASF GitHub Bot logged work on BEAM-12818:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 30/Aug/21 09:56
            Start Date: 30/Aug/21 09:56
    Worklog Time Spent: 10m 
      Work Description: scwhittle opened a new pull request #15416:
URL: https://github.com/apache/beam/pull/15416


    This ensures that files have distributed prefix that is common across 
pipeline executions and thus can reuse GCS autoscaling of the file metadata.
   ------------------------
   
   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 
Contributor License Agreement](https://www.apache.org/licenses/icla.pdf).
   
   See the [Contributor Guide](https://beam.apache.org/contribute) for more 
tips on [how to make review process 
smoother](https://beam.apache.org/contribute/#make-reviewers-job-easier).
   
   `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: 643365)
    Remaining Estimate: 0h
            Time Spent: 10m

> When writing to GCS, spread prefix of temporary files and reuse autoscaling 
> of the temporary directory
> ------------------------------------------------------------------------------------------------------
>
>                 Key: BEAM-12818
>                 URL: https://issues.apache.org/jira/browse/BEAM-12818
>             Project: Beam
>          Issue Type: Bug
>          Components: io-java-gcp
>            Reporter: Sam Whittle
>            Assignee: Sam Whittle
>            Priority: P2
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> When writing files using FileIO, the given temporary directory has a 
> subdirectory created in it for each FileBasedSink.  This is useful for 
> non-windowed output where the temporary directory can be matched to delete 
> leftover files that were lost during processing.
> However for windowed writes such subdirectories are unnecessary and cause a 
> common prefix to be shared for the temporary files. Additionally this common 
> prefix varies per job and thus the autoscaling for the previous prefix is no 
> longer effective, see
> https://cloud.google.com/storage/docs/request-rate#randomness_after_sequential_prefixes_is_not_as_effective



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