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

["T Jake Luciani (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-2527?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14019018#comment-14019018 ] 

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:
{code}
/nodes 
           / ip1
                   /snapshot1/ 
                                     /keyspace1/
                                              SStable1-data.db
                                              .....
                  /snapshot2/
                                     ...
          / ip2
                  ...
{code}

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: https://issues.apache.org/jira/browse/CASSANDRA-2527
>             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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