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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-2023) TestDFSIO read test may not read specified bytes.
Date Fri, 03 Sep 2010 01:13:36 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2023?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12905759#action_12905759
] 

Tsz Wo (Nicholas), SZE commented on MAPREDUCE-2023:
---------------------------------------------------

I ran TestDFSIO with a similar patch earlier.  Without the patch, the number of bytes read
by TestDFSIO may be less than the one specified in the parameter.  In such case, the reported
Throughput and Average IO rate could be > 1 GB/second, which is obviously incorrectly.

I have committed this.  Thanks, Hong!

> TestDFSIO read test may not read specified bytes.
> -------------------------------------------------
>
>                 Key: MAPREDUCE-2023
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2023
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: benchmarks
>            Reporter: Hong Tang
>            Assignee: Hong Tang
>         Attachments: mr-2023-20100826.patch, mr-2023-20100902.patch, TestFsRead.java
>
>
> TestDFSIO's read test may read less bytes than specified when reading large files.

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