[jira] [Commented] (MAHOUT-770) Add CassandraDataModel

["Eduardo Gurgel Pinho (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAHOUT-770?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13453020#comment-13453020 ] 

Eduardo Gurgel Pinho commented on MAHOUT-770:
---------------------------------------------

The *removePreference* method does not remove things from the column families userIDs and itemIDs. Why this behavior?
{code:java}
@Override
  public void removePreference(long userID, long itemID) {
    Mutator<Long> mutator = HFactory.createMutator(keyspace, LongSerializer.get());
    mutator.addDeletion(userID, USERS_CF, itemID, LongSerializer.get());
    mutator.addDeletion(itemID, ITEMS_CF, userID, LongSerializer.get());
    mutator.execute();
    // Not deleting from userIDs, itemIDs though
  }
{code}
                
> Add CassandraDataModel
> ----------------------
>
>                 Key: MAHOUT-770
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-770
>             Project: Mahout
>          Issue Type: Improvement
>          Components: Collaborative Filtering
>    Affects Versions: 0.5
>            Reporter: Sean Owen
>            Assignee: Sean Owen
>            Priority: Minor
>              Labels: cassandra, collaborative-filtering, datamodel, hector, recommender, thrift
>             Fix For: 0.6
>
>         Attachments: MAHOUT-770.patch
>
>
> In the spirit of MongoDBDataModel I'd like to add a CassandraDataModel as a backing store for non-distributed recommenders. 
> It takes a somewhat different approach, heavily reliant on in-memory caching, as Cassandra is a different beast.
> Patch is attached. This goes in integration, not core. It uses Hector, not the raw Thrift API.

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