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From "Mostafa Mokhtar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13203) S3A: Support fadvise "random" mode for high performance readPositioned() reads
Date Tue, 17 Oct 2017 23:48:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16208605#comment-16208605
] 

Mostafa Mokhtar commented on HADOOP-13203:
------------------------------------------

[~sailesh] FYI

> S3A: Support fadvise "random" mode for high performance readPositioned() reads
> ------------------------------------------------------------------------------
>
>                 Key: HADOOP-13203
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13203
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 2.8.0
>            Reporter: Rajesh Balamohan
>            Assignee: Rajesh Balamohan
>             Fix For: 2.8.0, 3.0.0-alpha1
>
>         Attachments: HADOOP-13203-branch-2-001.patch, HADOOP-13203-branch-2-002.patch,
HADOOP-13203-branch-2-003.patch, HADOOP-13203-branch-2-004.patch, HADOOP-13203-branch-2-005.patch,
HADOOP-13203-branch-2-006.patch, HADOOP-13203-branch-2-007.patch, HADOOP-13203-branch-2-008.patch,
HADOOP-13203-branch-2-009.patch, HADOOP-13203-branch-2-010.patch, stream_stats.tar.gz
>
>
> Currently file's "contentLength" is set as the "requestedStreamLen", when invoking S3AInputStream::reopen().
 As a part of lazySeek(), sometimes the stream had to be closed and reopened. But lots of
times the stream was closed with abort() causing the internal http connection to be unusable.
This incurs lots of connection establishment cost in some jobs.  It would be good to set the
correct value for the stream length to avoid connection aborts. 
> I will post the patch once aws tests passes in my machine.



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