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From: Apache Wiki <wikidiffs@apache.org>
To: Apache Wiki <wikidiffs@apache.org>
Date: Tue, 06 Apr 2010 20:58:20 -0000
Message-ID: <20100406205820.5901.51214@eos.apache.org>
Subject: 
 =?utf-8?q?=5BHadoop_Wiki=5D_Update_of_=22ZooKeeper/PoweredBy=22_by_PeterN?=
 =?utf-8?q?eubauer?=

Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Hadoop Wiki" for ch=
ange 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=3Ddiff&rev1=3D13&r=
ev2=3D14

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

   * [[http://hadoop.apache.org/hbase/|HBase]] - HBase is the Hadoop databa=
se. Its an open-source, distributed, column-oriented store modeled after th=
e Google paper, Bigtable: A Distributed Storage System for Structured Data =
by Chang et al.
     We use ZooKeeper for master election, server lease management, bootstr=
apping, 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-m=
aster 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 & App=
s team uses ZooKeeper to coordinate sharding and responsibility changes in =
a distributed e-mail client that pulls and indexes data for search. ZooKeep=
er also provides distributed locking for connections to prevent a cluster f=
rom overwhelming servers.
  =

   * [[http://www.yahoo.com/|Yahoo!]] - ZooKeeper is used for a myriad of s=
ervices inside Yahoo! for doing leader election, configuration management, =
sharding, locking, group membership etc.