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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Update of "Hbase/PoweredBy" by jgray
Date Mon, 10 Nov 2008 19:15:23 GMT
Dear Wiki user,

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

The following page has been changed by jgray:

  [http://www.mahalo.com Mahalo], "...the world's first human-powered search engine". All
the markup that powers the wiki is stored in HBase. It's been in use for a few months now.
!MediaWiki - the same software that power Wikipedia - has version/revision control. Mahalo's
in-house editors produce a lot of revisions per day, which was not working well in a RDBMS.
An hbase-based solution for this was built and tested, and the data migrated out of MySQL
and into HBase. Right now it's at something like 6 million items in HBase. The upload tool
runs every hour from a shell script to back up that data, and on 6 nodes takes about 5-10
minutes to run - and does not slow down production at all. 
  [http://www.powerset.com/ Powerset (a Microsoft company)] uses HBase to store raw documents.
 We have a ~70 node hadoop cluster running DFS, mapreduce, and hbase.  In our wikipedia hbase
table, we have one row for each wikipedia page (~2.5M pages and climbing).  We use this as
input to our indexing jobs, which are run in hadoop mapreduce.  Uploading the entire wikipedia
dump to our cluster takes a couple hours.  Scanning the table inside mapreduce is very fast
-- the latency is in the noise compared to everything else we do.
+ [http://www.streamy.com/ Streamy] is a recently launched realtime social news site.  We
use HBase for all of our data storage, query, and analysis needs, replacing an existing SQL-based
system.  This includes hundreds of millions of documents, sparse matrices, logs, and everything
else once done in the relational system.  We perform significant in-memory caching of query
results similar to a traditional Memcached/SQL setup as well as other external components
to perform joining and sorting.  We also run thousands of daily MapReduce jobs using HBase
tables for log analysis, attention data processing, and feed crawling.  HBase has helped us
scale and distribute in ways we could not otherwise, and the community has provided consistent
and invaluable assistance.
  [http://www.subrecord.org SubRecord Project] is an Open Source project that is using HBase
as a repository of records (persisted map-like data) for the aspects it provides like logging,
tracing or metrics. HBase and Lucene index both constitute a repo/storage for this platform.

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