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https://issues.apache.org/jira/browse/HADOOP-1649?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Raghu Angadi updated HADOOP-1649:
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Attachment: HADOOP-1649.patch
Thanks for the feedback, Konstantin.
(1) - done
(2) - done : renamed them. {{randomAccessFile}} becomes {{blockInFIle}} and
{{in}} becomes {{blockIn}}.
(4) - done (not really related to this Jira)
(3) : Could you elaborate? This Jira is about improved performance with
buffering. Buffer for reading the file is less important than buffer for
writing the file (on machines tested). But it still helps.
> Performance regression with Block CRCs
> --------------------------------------
>
> Key: HADOOP-1649
> URL: https://issues.apache.org/jira/browse/HADOOP-1649
> Project: Hadoop
> Issue Type: Bug
> Affects Versions: 0.14.0
> Reporter: Raghu Angadi
> Assignee: Raghu Angadi
> Priority: Blocker
> Fix For: 0.14.0
>
> Attachments: HADOOP-1649.patch, HADOOP-1649.patch, HADOOP-1649.patch
>
>
> Performance is noticeably affected by Block Level CRCs patch (HADOOP-1134).
> This is more noticeable on writes (randomriter test etc).
> With random writer, it takes 20-25% on small cluster (20 nodes) and many be
> 10% on larger cluster.
> There are a few differences in how data is written with 1134. As soon as I
> can reproduce this, I think it will be easier to fix.
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