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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Update of "Hbase/UsingBloomFilters" by JimKellerman
Date Mon, 28 Jul 2008 23:41:20 GMT
Dear Wiki user,

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The following page has been changed by JimKellerman:
http://wiki.apache.org/hadoop/Hbase/UsingBloomFilters

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+ Bloom filters can be enabled on a per-column family basis in HBase. By specifying true for
the bloom filter parameter in the constructor for HColumnDescriptor or by calling HColumnDescriptor.setBloomFilter(true),
a bloom filter 
- Bloom filters can be enabled on a per-column family basis in Hbase. 
- There are four bloom filter variants supported:
-  1. A [http://portal.acm.org/citation.cfm?id=362692&dl=ACM&coll=portal bloom filter]
as defined by Bloom in 1970.
+  [http://portal.acm.org/citation.cfm?id=362692&dl=ACM&coll=portal bloom filter]
as defined by Bloom in 1970 will be added to the column family.
-  1. A [http://portal.acm.org/citation.cfm?id=343571.343572 counting bloom filter] as defined
by Fan et al. in a ToN 2000 paper.
-  1. A [http://www-rp.lip6.fr/site_npa/site_rp/_publications/740-rbf_cameraready.pdf retouched
bloom filter] as described in the CoNEXT 2006 paper.
-  1. A [http://www.cse.fau.edu/~jie/research/publications/Publication_files/infocom2006.pdf
dynamic bloom filter] as defined in the INFOCOM 2006 paper.
  
  Bloom filters can be instantiated by specifying the vector size and the number of hash functions.
 Dynamic bloom filters require an additional argument, a threshold for the maximum number
of keys to record in a row.  
  

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