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https://issues.apache.org/jira/browse/HADOOP-19354?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17928842#comment-17928842
 ] 

ASF GitHub Bot commented on HADOOP-19354:
-----------------------------------------

hadoop-yetus commented on PR #7412:
URL: https://github.com/apache/hadoop/pull/7412#issuecomment-2671879172

   :confetti_ball: **+1 overall**
   
   
   
   
   
   
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> S3A: InputStreams to be created by factory under S3AStore
> ---------------------------------------------------------
>
>                 Key: HADOOP-19354
>                 URL: https://issues.apache.org/jira/browse/HADOOP-19354
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 3.4.2
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 3.5.0
>
>
> Migrate S3AInputStream creation into a factory pattern, push down into 
> S3AStore.
> Proposed factories
> * default: whatever this release has as default
> * classic: current S3AInputStream
> * prefetch: prefetching
> * analytics: new analytics stream
> * other: reads a classname from another prop, instantiates.
> Also proposed
> * stream to implement some stream capability to declare what they are 
> (classic, prefetch, analytics, other). 
> h2. Implementation
> All callbacks used by the stream also to call directly onto S3AStore.
> S3AFileSystem must not be invoked at all (if it is needed: PR is still not 
> ready).
> Some interface from Instrumentation will be passed to factory; this shall 
> include a way to create new per-stream 
> The factory shall implement org.apache.hadoop.service.Service; S3AStore shall 
> do same and become a subclass of CompositeService. It shall attach the 
> factory as a child, so they can follow the same lifecycle. We shall do the 
> same for anything else that gets pushed down.
> Everything related to stream creation must go from s3afs; and creation of the 
> factory itself. This must be done in S3AStore.initialize(). 
> As usual, this will complicate mocking. But the streams themselves should not 
> require changes, at least significant ones.
> Testing.
> * The huge file tests should be tuned so each of the different ones uses a 
> different stream, always.
> * use a -Dstream="factory name" to choose factory, rather than the -Dprefetch
> * if not set, whatever is in auth-keys gets picked up.



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