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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-13871) ITestS3AInputStreamPerformance.testTimeToOpenAndReadWholeFileBlocks performance on branch-2.8 awful
Date Thu, 08 Dec 2016 14:23:59 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-13871?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Steve Loughran updated HADOOP-13871:
    Attachment: org.apache.hadoop.fs.s3a.scale.ITestS3AInputStreamPerformance-output.txt

Attaching log with detail on every single read which takes place. For the initial operation,
its taking hundreds of nS/byte, until eventually there's a socket timeout and a reconnect,
after which I get expected performance.

Tested over wifi as well as ether

> ITestS3AInputStreamPerformance.testTimeToOpenAndReadWholeFileBlocks performance on branch-2.8
> ---------------------------------------------------------------------------------------------------
>                 Key: HADOOP-13871
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13871
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 2.8.0
>         Environment: landsat bucket from the UK
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>         Attachments: org.apache.hadoop.fs.s3a.scale.ITestS3AInputStreamPerformance-output.txt
> The ITestS3AInputStreamPerformance.testTimeToOpenAndReadWholeFileBlocks takes 15s on
branch-2, but is now taking minutes on branch-2.8.
> This is a regression, and it's surfacing on some internal branches too. Even where the
code hasn't changed. It does not happen on branch-2, which has a later SDK.

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