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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-13203) S3A: Support fadvise "random" mode for high performance readPositioned() reads
Date Wed, 22 Jun 2016 14:02:58 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-13203?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Steve Loughran updated HADOOP-13203:
------------------------------------
    Summary: S3A: Support fadvise "random" mode for high performance readPositioned() reads
 (was: S3a: Consider reducing the number of connection aborts by setting correct length in
s3 request)

> 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: Steve Loughran
>         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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