svn commit: r1680045 - /accumulo/site/trunk/content/release_notes/1.7.0.mdtext

[el...@apache.org]

Author: elserj
Date: Mon May 18 15:35:13 2015
New Revision: 1680045

URL: http://svn.apache.org/r1680045
Log:
ACCUMULO-3737 Describe data-center replication in 1.7 release notes

Modified:
    accumulo/site/trunk/content/release_notes/1.7.0.mdtext

Modified: accumulo/site/trunk/content/release_notes/1.7.0.mdtext
URL: http://svn.apache.org/viewvc/accumulo/site/trunk/content/release_notes/1.7.0.mdtext?rev=1680045&r1=1680044&r2=1680045&view=diff
==============================================================================
--- accumulo/site/trunk/content/release_notes/1.7.0.mdtext (original)
+++ accumulo/site/trunk/content/release_notes/1.7.0.mdtext Mon May 18 15:35:13 2015
@@ -20,6 +20,8 @@ Apache Accumulo 1.7.0 is a release that
 
 #DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT
 
+# Notable Improvements
+
 ### Client Authentication with Kerberos
 
 Kerberos is far and away the de-facto means provide strong authentication across Hadoop
@@ -49,6 +51,23 @@ User Manual.
 
 ### Data-Center Replication
 
+In previous releases, Accumulo only operated withing the constraints of a single installation.
+Because single instances of Accumulo often consist of many nodes and Accumulo's design scales
+efficiently across many nodes, it is typical that one Accumulo is run per physical installation
+or data-center. [ACCUMULO-378][ACCUMULO-378] introduces support in Accumulo to automatically
+copy data from one Accumulo instance to another.
+
+This data-center replication feature is directly applicable for users wishing to implement
+a disaster recovery strategy. Data can be automatically sent from a primary instance to one
+or more other Accumulo instances. Conversely to normal Accumulo operation in which ingest and
+query are strongly consistent, replication is a lazy, eventually consistent operation. This
+is desirable for replication as it prevent additional latency for ingest operations on the
+primary instance. Additionally, outages between the primary instance and replicas can sustain
+prolonged outages without any administrative overhead.
+
+The Accumulo User Manual contains a [new chapter on replication][replication] which covers
+in better detail the design and implementation of the feature, how users can configure replication
+and special cases to consider when choosing to integrate the feature into a user application.
 
 
 ### User Initiated Compaction Strategies
@@ -212,4 +231,6 @@ and, in HDFS High-Availability instances
 [ACCUMULO-2815]: https://issues.apache.org/jira/browse/ACCUMULO-2815
 [SASL]: http://en.wikipedia.org/wiki/Simple_Authentication_and_Security_Layer
 [GSSAPI]: http://en.wikipedia.org/wiki/Generic_Security_Services_Application_Program_Interface
-[kerberos]: http://accumulo.staging.apache.org/1.7/accumulo_user_manual.html#_kerberos
\ No newline at end of file
+[kerberos]: http://accumulo.staging.apache.org/1.7/accumulo_user_manual.html#_kerberos
+[ACCUMULO-378]: https://issues.apache.org/jira/browse/ACCUMULO-378
+[replication]: http://accumulo.staging.apache.org/1.7/accumulo_user_manual.html#_replication
\ No newline at end of file