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https://issues.apache.org/jira/browse/HADOOP-2705?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12562719#action_12562719
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stack commented on HADOOP-2705:
-------------------------------
Description says upping buffer size improves read times by 40% but later, says
"...typically around 5% on reads for most cases" with a 'single node' qualifier.
To be clear, this patch improves reads by 5% for single nodes only but by 40%
when > a single node? Thanks.
> io.file.buffer.size should default to a value larger than 4k
> ------------------------------------------------------------
>
> Key: HADOOP-2705
> URL: https://issues.apache.org/jira/browse/HADOOP-2705
> Project: Hadoop Core
> Issue Type: Improvement
> Components: conf
> Reporter: Chris Douglas
> Assignee: Chris Douglas
> Priority: Minor
> Fix For: 0.16.0
>
> Attachments: 2705-0.patch
>
>
> Tests using HADOOP-2406 suggest that increasing this to 32k from 4k improves
> read times for block, lzo compressed SequenceFiles by over 40%; 32k is a
> relatively conservative bump.
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