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https://issues.apache.org/jira/browse/HADOOP-17404?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sneha Vijayarajan updated HADOOP-17404:
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Status: Patch Available (was: Open)
> 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: 20m
> 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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