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.
