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From "T Jake Luciani (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-2527) Add ability to snapshot data as input to hadoop jobs
Date Thu, 05 Jun 2014 17:39:03 GMT


T Jake Luciani commented on CASSANDRA-2527:

This might be a bit off the wall but my idea was to make a mock read only hdfs compatible
file system.  

The structure of which would look like:
           / ip1
          / ip2

Since this data is immutable there would be no namenode service, it would simply query the
nodes for the file info.  
If the mapper runs on a non-local node we use a sendfile() copy mechanism.

> Add ability to snapshot data as input to hadoop jobs
> ----------------------------------------------------
>                 Key: CASSANDRA-2527
>                 URL:
>             Project: Cassandra
>          Issue Type: New Feature
>            Reporter: Jeremy Hanna
>            Assignee: Joshua McKenzie
>            Priority: Minor
>              Labels: hadoop
>             Fix For: 3.0
> 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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