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Posted to common-commits@hadoop.apache.org by Apache Wiki <wi...@apache.org> on 2007/08/29 13:13:56 UTC
[Lucene-hadoop Wiki] Trivial Update of "Hbase/RDF" by InchulSong
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The following page has been changed by InchulSong:
http://wiki.apache.org/lucene-hadoop/Hbase/RDF
The comment on the change is:
Concrete examples will be presented after careful thoughts.
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a column-based storage and adopts various compression techniques,
is very good at dealing with nulls in the table
- HDL reads a triple at a time and inserts the triple into a Hbase table as follows:
-
- {{{#!python numbering=off
- value_count = 1
- for s, p, o in triples:
- insert into rdf_table ('p:value_count') values ('o')
- where row='s'
- value_count = value_count + 1
- }}}
-
=== HbaseRDF Query Processor ===
HbaseRDF Query Processor (HQP) executes RDF queries on RDF data stored in a Hbase table.
It translates RDF queries into API calls to Hbase, or MapReduce jobs, gathers and returns the results