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From "ASF GitHub Bot (Jira)" <j...@apache.org>
Subject [jira] [Work logged] (HADOOP-11867) FS API: Add a high-performance vectored Read to FSDataInputStream API
Date Fri, 25 Sep 2020 13:32:02 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-11867?focusedWorklogId=490975&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-490975

ASF GitHub Bot logged work on HADOOP-11867:

                Author: ASF GitHub Bot
            Created on: 25/Sep/20 13:31
            Start Date: 25/Sep/20 13:31
    Worklog Time Spent: 10m 
      Work Description: hadoop-yetus removed a comment on pull request #1830:
URL: https://github.com/apache/hadoop/pull/1830#issuecomment-696332135

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Issue Time Tracking

    Worklog Id:     (was: 490975)
    Time Spent: 6h 20m  (was: 6h 10m)

> FS API: Add a high-performance vectored Read to FSDataInputStream API
> ---------------------------------------------------------------------
>                 Key: HADOOP-11867
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11867
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: fs, fs/azure, fs/s3, hdfs-client
>    Affects Versions: 3.0.0
>            Reporter: Gopal Vijayaraghavan
>            Assignee: Owen O'Malley
>            Priority: Major
>              Labels: performance, pull-request-available
>          Time Spent: 6h 20m
>  Remaining Estimate: 0h
> The most significant way to read from a filesystem in an efficient way is to let the
FileSystem implementation handle the seek behaviour underneath the API to be the most efficient
as possible.
> A better approach to the seek problem is to provide a sequence of read locations as part
of a single call, while letting the system schedule/plan the reads ahead of time.
> This is exceedingly useful for seek-heavy readers on HDFS, since this allows for potentially
optimizing away the seek-gaps within the FSDataInputStream implementation.
> For seek+read systems with even more latency than locally-attached disks, something like
a {{readFully(long[] offsets, ByteBuffer[] chunks)}} would take of the seeks internally while
reading chunk.remaining() bytes into each chunk (which may be {{slice()}}ed off a bigger buffer).
> The base implementation can stub in this as a sequence of seeks + read() into ByteBuffers,
without forcing each FS implementation to override this in any way.

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