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https://issues.apache.org/jira/browse/HADOOP-1298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12553889
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dhruba borthakur commented on HADOOP-1298:
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My belief is that the current NNbench is bottlenecked on the network. The
test-results depend on the network latency between the clients and the
namenode. That's the reason why you do not see any difference in performance.
In the current run, you probably had one thread per client (or 2 mappers per
client). Increasing the number of client processes could make the test
bottleneck on CPU. Once that happens, we can then run 1298 and measure the
degradation in performance.
> adding user info to file
> ------------------------
>
> Key: HADOOP-1298
> URL: https://issues.apache.org/jira/browse/HADOOP-1298
> Project: Hadoop
> Issue Type: New Feature
> Components: dfs, fs
> Reporter: Kurtis Heimerl
> Assignee: Tsz Wo (Nicholas), SZE
> Attachments: 1298_2007-09-22_1.patch, 1298_2007-10-04_1.patch,
> 1298_20071220c.patch, hadoop-user-munncha.patch17,
> HDFSPermissionSpecification4.pdf
>
>
> I'm working on adding a permissions model to hadoop's DFS. The first step is
> this change, which associates user info with files. Following this I'll
> assoicate permissions info, then block methods based on that user info, then
> authorization of the user info.
> So, right now i've implemented adding user info to files. I'm looking for
> feedback before I clean this up and make it offical.
> I wasn't sure what release, i'm working off trunk.
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