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From "Jonathan Ellis (JIRA)" <>
Subject [jira] Resolved: (CASSANDRA-747) Need a additional method for Hadoop Range Queries.
Date Fri, 29 Jan 2010 19:08:34 GMT


Jonathan Ellis resolved CASSANDRA-747.

       Resolution: Duplicate
    Fix Version/s:     (was: 0.6)

Let's keep this to CASSANDRA-342, please.

> Need a additional method for Hadoop Range Queries.
> --------------------------------------------------
>                 Key: CASSANDRA-747
>                 URL:
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>    Affects Versions: 0.6
>         Environment: Need to add additional method for Range queries from Hadoop. 
>            Reporter: Vijay
>            Priority: Minor
> Hadoop Integration might need the following.....
> 1) API to return the List of splits, given the number of splits. 
> Using this tokens we cam span equal number of MR Jobs (Have a configuration in MR Job
- This will be according to the complexity in processing), which will say how many map tasks
per partition and span those process.
> 2) Start token to stream.... API
> Input will be Range(String startKey, Token start, Token finish, int limit).... return
will be 
>     If Startwithkey is empty we will use the token1 as the starting point for the stream,
else we will use startwithkey to specify the key to start with? Make sense?
> So each MR jobs will get the range of data from the Cassandra and will do processing
on it, it can also stream the data and doesn't need to get all of it.

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