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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Update of "ZooKeeper/PoweredBy" by PeterNeubauer
Date Tue, 06 Apr 2010 20:58:20 GMT
Dear Wiki user,

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

The "ZooKeeper/PoweredBy" page has been changed by PeterNeubauer.
The comment on this change is: Adding Neo4j HA.
http://wiki.apache.org/hadoop/ZooKeeper/PoweredBy?action=diff&rev1=13&rev2=14

--------------------------------------------------

   * [[http://hadoop.apache.org/hbase/|HBase]] - HBase is the Hadoop database. Its an open-source,
distributed, column-oriented store modeled after the Google paper, Bigtable: A Distributed
Storage System for Structured Data by Chang et al.
     We use ZooKeeper for master election, server lease management, bootstrapping, and coordination
between servers.
  
+  * [[http://neo4j.org/hbase/|Neo4j]] - Neo4j is a Graph Database. It's a disk based, ACID
compliant transactional storage engine for big graphs and fast graph traversals, using external
indicies like Lucene/Solr for global searches.
+    We use ZooKeeper in the Neo4j High Availability components for write-master election,
read slave coordination and other cool stuff. ZooKeeper is a great and focused  project -
we like!
+ 
   * [[http://www.rackspace.com/email_hosting|Rackspace]] - The Email & Apps team uses
ZooKeeper to coordinate sharding and responsibility changes in a distributed e-mail client
that pulls and indexes data for search. ZooKeeper also provides distributed locking for connections
to prevent a cluster from overwhelming servers.
  
   * [[http://www.yahoo.com/|Yahoo!]] - ZooKeeper is used for a myriad of services inside
Yahoo! for doing leader election, configuration management, sharding, locking, group membership
etc.

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