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Posted to common-dev@hadoop.apache.org by "Steve Loughran (Jira)" <ji...@apache.org> on 2022/10/06 11:02:00 UTC
[jira] [Resolved] (HADOOP-18378) Implement readFully(long position, byte[] buffer, int offset, int length)
[ https://issues.apache.org/jira/browse/HADOOP-18378?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Steve Loughran resolved HADOOP-18378.
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Fix Version/s: 3.4.0
Resolution: Fixed
> 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
> Fix For: 3.4.0
>
>
> 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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