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https://issues.apache.org/jira/browse/HADOOP-13203?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chris Nauroth updated HADOOP-13203:
-----------------------------------
Release Note: S3A has added support for configurable input policies.
Similar to fadvise, this configuration provides applications with a way to
specify their expected access pattern (sequential or random) while reading a
file. S3A then performs optimizations tailored to that access pattern. See
site documentation of the fs.s3a.experimental.input.fadvise configuration
property for more details. Please be advised that this feature is experimental
and subject to backward-incompatible changes in future releases.
> 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
>
> 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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