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From build...@apache.org
Subject svn commit: r900361 - in /websites/staging/accumulo/trunk/content: ./ release_notes/1.5.1.html
Date Thu, 06 Mar 2014 23:32:49 GMT
Author: buildbot
Date: Thu Mar  6 23:32:49 2014
New Revision: 900361

Log:
Staging update by buildbot for accumulo

Modified:
    websites/staging/accumulo/trunk/content/   (props changed)
    websites/staging/accumulo/trunk/content/release_notes/1.5.1.html

Propchange: websites/staging/accumulo/trunk/content/
------------------------------------------------------------------------------
--- cms:source-revision (original)
+++ cms:source-revision Thu Mar  6 23:32:49 2014
@@ -1 +1 @@
-1575094
+1575095

Modified: websites/staging/accumulo/trunk/content/release_notes/1.5.1.html
==============================================================================
--- websites/staging/accumulo/trunk/content/release_notes/1.5.1.html (original)
+++ websites/staging/accumulo/trunk/content/release_notes/1.5.1.html Thu Mar  6 23:32:49 2014
@@ -124,13 +124,21 @@ Additionally, a non-intuitive error was 
 <p>Apache Thrift is used as the internal RPC service. <a href="https://issues.apache.org/jira/browse/ACCUMULO-2360">ACCUMULO-2360</a>
allows 
 users to configure the maximum frame size an Accumulo server will read. This 
 prevents non Accumulo client from connecting and causing memory exhaustion.</p>
+<h3 id="multitablebatchwriter-concurrency">MultiTableBatchWriter concurrency</h3>
+<p>The MultiTableBatchWriter is a class which allows multiple tables to be written
to
+from a single object that maintains a single buffer for caching Mutations across all tables.
This is desirable
+as it greatly simplifies the JVM heap usage from caching Mutations across
+many tables. Sadly, in Apache Accumulo 1.5.0, concurrent access to a single MultiTableBatchWriter
+heavily suffered from synchronization issues. <a href="https://issues.apache.org/jira/browse/ACCUMULO-1833">ACCUMULO-1833</a>
introduces a fix
+which alleviates the blocking and idle-wait that previously occurred when multiple threads
accessed
+a single MultiTableBatchWriter instance concurrently.</p>
 <h3 id="hadoop-versions">Hadoop Versions</h3>
 <p>Since Apache Accumulo 1.5.0 was released, Apache Hadoop 2.2.0 was also released
 as the first generally available (GA) Hadoop 2 release. This was a very exciting release
 for a number of reasons, but this also caused additional effort on Accumulo's part to
 ensure that Apache Accumulo continues to work across multiple Hadoop versions. Apache Accumulo
1.5.1
 should function with any recent Hadoop 1 or Hadoop 2 without any special steps, tricks or
instructions
-required. </p>
+required.</p>
 <h2 id="notable-bug-fixes">Notable Bug Fixes</h2>
 <p>As with any Apache Accumulo release, we have numerous bug fixes that have been fixed.
Most
 are very subtle and won't affect the common user; however, some notable bugs were resolved




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