Author: phunt
Date: Fri Oct 3 16:22:21 2008
New Revision: 701566
URL: http://svn.apache.org/viewvc?rev=701566&view=rev
Log:
ZOOKEEPER-154. reliability graph diagram in overview doc needs context &
ZOOKEEPER-155. improve the zookeeper project section of overview doc
Modified:
hadoop/zookeeper/trunk/CHANGES.txt
hadoop/zookeeper/trunk/src/docs/src/documentation/content/xdocs/zookeeperOver.xml
Modified: hadoop/zookeeper/trunk/CHANGES.txt
URL:
http://svn.apache.org/viewvc/hadoop/zookeeper/trunk/CHANGES.txt?rev=701566&r1=701565&r2=701566&view=diff
==============================================================================
--- hadoop/zookeeper/trunk/CHANGES.txt (original)
+++ hadoop/zookeeper/trunk/CHANGES.txt Fri Oct 3 16:22:21 2008
@@ -17,6 +17,12 @@
BUGFIXES:
+ ZOOKEEPER-154. reliability graph diagram in overview doc needs context
+ (phunt)
+
+ ZOOKEEPER-155. improve "the zookeeper project" section of overview doc
+ (phunt)
+
ZOOKEEPER-147. This is version of the documents with most of the [tbd...]
scrubbed out (robbie via phunt)
Modified:
hadoop/zookeeper/trunk/src/docs/src/documentation/content/xdocs/zookeeperOver.xml
URL:
http://svn.apache.org/viewvc/hadoop/zookeeper/trunk/src/docs/src/documentation/content/xdocs/zookeeperOver.xml?rev=701566&r1=701565&r2=701566&view=diff
==============================================================================
---
hadoop/zookeeper/trunk/src/docs/src/documentation/content/xdocs/zookeeperOver.xml
(original)
+++
hadoop/zookeeper/trunk/src/docs/src/documentation/content/xdocs/zookeeperOver.xml
Fri Oct 3 16:22:21 2008
@@ -387,16 +387,28 @@
<para>Failure of another leader</para>
</listitem>
</orderedlist>
+ </section>
- <para><figure id="fg_zkPerfReliability">
- <title>Reliability in the Presence of Errors</title>
+ <section>
+ <title>Reliability</title>
+ <para>To show the behavior of the system over time as
+ failures are injected we ran a ZooKeeper service made up of
+ 7 machines. We ran the same saturation benchmark as before,
+ but this time we kept the write percentage at a constant
+ 30%, which is a conservative ratio of our expected
+ workloads.
+ </para>
+ <para>
+ <figure id="fg_zkPerfReliability">
+ <title>Reliability in the Presence of Errors</title>
<mediaobject>
<imageobject>
<imagedata fileref="images/zkperfreliability.jpg" />
</imageobject>
</mediaobject>
- </figure></para>
+ </figure>
+ </para>
<para>The are a few important observations from this graph. First, if
followers fail and recover quickly, then ZooKeeper is able to sustain a
@@ -411,25 +423,27 @@
<section>
<title>The ZooKeeper Project</title>
- <para>ZooKeeper has been successfully used in industrial applications.
- It is used at Yahoo! as the coordination and failure recovery service
- for Yahoo! Message Broker, which is a highly scalable publish-subscribe
- system managing thousands of topics for replication and data delivery.
- It is used by the Fetching Service for Yahoo! crawler, where it also
- manages failure recovery. And it is used by Hadoop On Demand (HOD),
- which is an open source implementation of the map-reduce model of
- computation. HOD uses Zookeeper as a communications and control channel
- between slave and master process. (For more information, see the <ulink
- url="http://hadoop.apache.org/core/";>Hadoop</ulink> and <ulink
- url="http://hadoop.apache.org/core/docs/current/hod.html";>Hadoop on
- Demand</ulink> open source projects on Apache.)</para>
-
- <para>ZooKeeper itself is an open source project, under the Apache Open
- Source Foundation. It is a subproject of Hadoop. All users and
- developers are encourged to join the community and contribute their
- expertise. See the <ulink
- url="http://hadoop.apache.org/zookeeper/";>Zookeeper Project on
- Apache</ulink> for more information.</para>
+ <para>ZooKeeper has been
+ <ulink url="http://wiki.apache.org/hadoop/ZooKeeper/PoweredBy";>
+ successfully used
+ </ulink>
+ in many industrial applications. It is used at Yahoo! as the
+ coordination and failure recovery service for Yahoo! Message
+ Broker, which is a highly scalable publish-subscribe system
+ managing thousands of topics for replication and data
+ delivery. It is used by the Fetching Service for Yahoo!
+ crawler, where it also manages failure recovery. A number of
+ Yahoo! advertising systems also use ZooKeeper to implement
+ reliable services.
+ </para>
+
+ <para>All users and developers are encouraged to join the
+ community and contribute their expertise. See the
+ <ulink url="http://hadoop.apache.org/zookeeper/";>
+ Zookeeper Project on Apache
+ </ulink>
+ for more information.
+ </para>
</section>
</chapter>
</book>
