[jira] [Commented] (HADOOP-17961) s3 and abfs incremental listing: ask for a smaller first batch

["Steve Loughran (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-17961?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17600397#comment-17600397 ] 

Steve Loughran commented on HADOOP-17961:
-----------------------------------------

actually, the really slick way to do this is parse the XML responses through a SAX parser and so get the results incrementally, which we would be streamed direct to the iterators.

this would ensure the fewest #of requests (cost and efficiency), but deliver the lowest latencies possible between request issued and the first listing entries coming back

> s3 and abfs incremental listing: ask for a smaller first batch
> --------------------------------------------------------------
>
>                 Key: HADOOP-17961
>                 URL: https://issues.apache.org/jira/browse/HADOOP-17961
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/azure, fs/s3
>    Affects Versions: 3.3.2
>            Reporter: Steve Loughran
>            Priority: Minor
>
> With code gradually adopting listStatusIncremental(), asking for a smaller initial batch could permit faster ramp of result processing.
> probably most significant on an s3 versioned bucket, as there the need to skip tombstones can result in significantly slower listings -but could benefit ABFS too



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