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https://issues.apache.org/jira/browse/HADOOP-17074?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Loughran resolved HADOOP-17074.
-------------------------------------
    Fix Version/s: 3.3.1
       Resolution: Fixed

> Optimise s3a Listing to be fully asynchronous.
> ----------------------------------------------
>
>                 Key: HADOOP-17074
>                 URL: https://issues.apache.org/jira/browse/HADOOP-17074
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 3.3.0
>            Reporter: Mukund Thakur
>            Assignee: Mukund Thakur
>            Priority: Major
>             Fix For: 3.3.1
>
>
> Listing api returns a Remote iterator. Currently it is blocking in the 
> constructor Listing class. Also it is done in batches, so if a batch is 
> exhausted , the next batch will be fetched from s3 
> thus causing small pauses on the client side every time a batch is fetched. 
> We can add the following optimisations to fix these:
>  * Make the constructor list call to s3 asynchronous.
>  * Fetch the next batch asynchronously while the current batch is getting 
> processed.



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