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Posted to common-dev@hadoop.apache.org by "Owen O'Malley (JIRA)" <ji...@apache.org> on 2007/12/04 19:57:43 UTC

[jira] Commented: (HADOOP-2342) create a micro-benchmark for measure local-file versus hdfs read

    [ https://issues.apache.org/jira/browse/HADOOP-2342?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12548351 ] 

Owen O'Malley commented on HADOOP-2342:
---------------------------------------

The numbers I'm seeing for reads and writes on 10GB are:

Raw Local FS    write: 152       read: 79
Local FS             write: 203       read: 78
mini-DFS            write: 269       read: 134

which suggests that writing checksums is pretty expensive and that HADOOP-2144 is reproducible. 

> create a micro-benchmark for measure local-file versus hdfs read
> ----------------------------------------------------------------
>
>                 Key: HADOOP-2342
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2342
>             Project: Hadoop
>          Issue Type: Test
>          Components: dfs
>            Reporter: Owen O'Malley
>            Assignee: Owen O'Malley
>             Fix For: 0.16.0
>
>
> We should have a benchmark that measures reading a 10g file from hdfs and from local disk.

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