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From Apache Wiki <wikidi...@apache.org>
Subject [Incubator Wiki] Trivial Update of "HeartProposal" by Frederick Haebin Na
Date Wed, 23 Jul 2008 10:02:11 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Incubator Wiki" for change notification.

The following page has been changed by Frederick Haebin Na:
http://wiki.apache.org/incubator/HeartProposal

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  ## page was renamed from HRdfStoreProposal
  == Abstract ==
- Heart will develop a planet-scale RDF data store based on [http://hadoop.apache.org Hadoop]
& [http://hadoop.apache.org/hbase Hbase].
+ Heart will develop a planet-scale RDF data store and processing engine based on [http://hadoop.apache.org
Hadoop] & [http://hadoop.apache.org/hbase Hbase].
  
  == Proposal ==
- Heart will develop a Hadoop subsystem for RDF, called Heart, which uses Hbase + !MapReduce
to store RDF data and execute queries (e.g., SPARQL) on them.
+ Heart will develop a Hadoop subsystem for RDF data store and a processing engine which use
Hbase + !MapReduce to store and to process RDF data.
  
  == Background ==
  We can store very sparse RDF data in a single table in Hbase, with as many columns as they
need. For example, we might make a row for each RDF subject in a table and store all the properties
and their values as columns in the table. This reduces costly self-joins in answering queries
asking questions on the same subject, which results in efficient processing of queries, although
we still need self-joins to answer RDF path queries.

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