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Posted to commits@cassandra.apache.org by "Jonathan Ellis (JIRA)" <ji...@apache.org> on 2013/06/28 02:11:21 UTC

[jira] [Commented] (CASSANDRA-2527) Add ability to snapshot data as input to hadoop jobs

    [ https://issues.apache.org/jira/browse/CASSANDRA-2527?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13695180#comment-13695180 ] 

Jonathan Ellis commented on CASSANDRA-2527:
-------------------------------------------

With the code from CASSANDRA-5555, opening "batch mode" SSTR is basically free.  So there's no reason not to do it "right" and add a "use this snapshot" parameter to the InputFormat.  
                
> Add ability to snapshot data as input to hadoop jobs
> ----------------------------------------------------
>
>                 Key: CASSANDRA-2527
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2527
>             Project: Cassandra
>          Issue Type: New Feature
>            Reporter: Jeremy Hanna
>            Assignee: Brandon Williams
>              Labels: hadoop
>             Fix For: 2.1
>
>
> It is desirable to have immutable inputs to hadoop jobs for the duration of the job.  That way re-execution of individual tasks do not alter the output.  One way to accomplish this would be to snapshot the data that is used as input to a job.

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