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From "Lei Xu (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5222) Add offset in client trace
Date Wed, 11 Feb 2009 22:11:59 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5222?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12672802#action_12672802

Lei Xu commented on HADOOP-5222:

So far, what I am doing is collecting logs from HDFS for future use. I think the blockId/offset/bytes
can provide a accurate records for each I/O operations.

Thus maybe it will be used for some replay tools and useful for I/O pattern analyzing, however
I have not got there yet. 

> Add offset in client trace
> --------------------------
>                 Key: HADOOP-5222
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5222
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: dfs
>    Affects Versions: 0.21.0
>            Reporter: Lei Xu
>            Priority: Minor
>             Fix For: 0.21.0
>         Attachments: clienttrace.patch
> By adding offset in client trace, the client trace information can provide more accurately
information about I/O.
> It is useful for performance analyzing.
> Since there is  no random write now, the offset of writing is always zero.

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