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https://issues.apache.org/jira/browse/HADOOP-17404?focusedWorklogId=535412&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-535412
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ASF GitHub Bot logged work on HADOOP-17404:
-------------------------------------------

                Author: ASF GitHub Bot
            Created on: 13/Jan/21 14:06
            Start Date: 13/Jan/21 14:06
    Worklog Time Spent: 10m 
      Work Description: steveloughran commented on pull request #2509:
URL: https://github.com/apache/hadoop/pull/2509#issuecomment-759470820


   Any plans to merge to branch-3.3? This is complicating my own backporting 
work. 
   
   If you do want it in -3.3, create a PR against it with this and the 
predecessor  #2526 in as separate commits, retest & declare the results. I'll 
do the merge afterwards.
   


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

    Worklog Id:     (was: 535412)
    Time Spent: 4h  (was: 3h 50m)

> ABFS: Piggyback flush on Append calls for short writes
> ------------------------------------------------------
>
>                 Key: HADOOP-17404
>                 URL: https://issues.apache.org/jira/browse/HADOOP-17404
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/azure
>    Affects Versions: 3.3.0
>            Reporter: Sneha Vijayarajan
>            Assignee: Sneha Vijayarajan
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 3.3.1
>
>          Time Spent: 4h
>  Remaining Estimate: 0h
>
> When Hflush or Hsync APIs are called, a call is made to store backend to 
> commit the data that was appended. 
> If the data size written by Hadoop app is small, i.e. data size :
>  * before any of HFlush/HSync call is made or
>  * between 2 HFlush/Hsync API calls
> is less than write buffer size, 2 separate calls, one for append and another 
> for flush is made,
> Apps that do such small writes eventually end up with almost similar number 
> of calls for flush and append.
> This PR enables Flush to be piggybacked onto append call for such short write 
> scenarios.
>  
> NOTE: The changes is guarded over a config, and is disabled by default until 
> relevant supported changes is made available on all store production clusters.
> New Config added: fs.azure.write.enableappendwithflush



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