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