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https://issues.apache.org/jira/browse/HADOOP-18378?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17611590#comment-17611590
 ] 

ASF GitHub Bot commented on HADOOP-18378:
-----------------------------------------

hadoop-yetus commented on PR #4955:
URL: https://github.com/apache/hadoop/pull/4955#issuecomment-1263576226

   :confetti_ball: **+1 overall**
   
   
   
   
   
   
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   | GITHUB PR | https://github.com/apache/hadoop/pull/4955 |
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   | Powered by | Apache Yetus 0.14.0 https://yetus.apache.org |
   
   
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> Implement readFully(long position, byte[] buffer, int offset, int length)
> -------------------------------------------------------------------------
>
>                 Key: HADOOP-18378
>                 URL: https://issues.apache.org/jira/browse/HADOOP-18378
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 3.4.0
>            Reporter: Ahmar Suhail
>            Assignee: Alessandro Passaro
>            Priority: Minor
>              Labels: pull-request-available
>
> Implement readFully(long position, byte[] buffer, int offset, int length) in 
> PrefetchingInputStream, as it currently uses FSInputStream's 
> [readFully|https://github.com/apache/hadoop/blob/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FSInputStream.java#L136]
>  which calls read(long position, byte[] buffer, int offset, int length).
> This read then seeks to the position (which is ok), but then seeks back to 
> the original starting position at the end (so always seeking back to 0). this 
> is pretty bad for the prefetching implementation as it means lots of caching 
> to disk and getting blocks from disk. 



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