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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4698) provide client-side metrics for remote reads, local reads, and short-circuit reads
Date Sat, 25 May 2013 15:08:25 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4698?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13667100#comment-13667100
] 

Suresh Srinivas commented on HDFS-4698:
---------------------------------------

I did not find the description of this jira in CHANGES.txt in branch-2. I have added it.
                
> provide client-side metrics for remote reads, local reads, and short-circuit reads
> ----------------------------------------------------------------------------------
>
>                 Key: HDFS-4698
>                 URL: https://issues.apache.org/jira/browse/HDFS-4698
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs-client
>    Affects Versions: 2.0.4-alpha
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>            Priority: Minor
>             Fix For: 3.0.0, 2.0.5-beta
>
>         Attachments: HDFS-4698.001.patch, HDFS-4698.002.patch, HDFS-4698.003.patch, HDFS-4698.004.patch,
HDFS-4698.005.patch, HDFS-4698.006.patch, HDFS-4698.007.patch, HDFS-4698.008.patch
>
>
> We should provide metrics to let clients know how many bytes of data they have read remotely,
versus locally or via short-circuit local reads.  This will allow clients to know how well
they're doing at bringing the computation to the data, which will be useful in evaluating
placement policies and cluster configurations.

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