[jira] [Work logged] (BEAM-12818) When writing to GCS, spread prefix of temporary files and reuse autoscaling of the temporary directory

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

     [ https://issues.apache.org/jira/browse/BEAM-12818?focusedWorklogId=651899&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-651899 ]

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

                Author: ASF GitHub Bot
            Created on: 16/Sep/21 17:24
            Start Date: 16/Sep/21 17:24
    Worklog Time Spent: 10m 
      Work Description: aaltay commented on pull request #15416:
URL: https://github.com/apache/beam/pull/15416#issuecomment-921090173


   @chamikaramj @reuvenlax - Could you please review this?


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

    Worklog Id:     (was: 651899)
    Time Spent: 40m  (was: 0.5h)

> 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: 40m
>  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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