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Subject svn commit: r964485 - in /websites/staging/accumulo/trunk/content: ./ release_notes/1.5.4.html
Date Sat, 05 Sep 2015 21:30:45 GMT
Author: buildbot
Date: Sat Sep  5 21:30:44 2015
New Revision: 964485

Staging update by buildbot for accumulo

    websites/staging/accumulo/trunk/content/   (props changed)

Propchange: websites/staging/accumulo/trunk/content/
--- cms:source-revision (original)
+++ cms:source-revision Sat Sep  5 21:30:44 2015
@@ -1 +1 @@

Added: websites/staging/accumulo/trunk/content/release_notes/1.5.4.html
--- websites/staging/accumulo/trunk/content/release_notes/1.5.4.html (added)
+++ websites/staging/accumulo/trunk/content/release_notes/1.5.4.html Sat Sep  5 21:30:44 2015
@@ -0,0 +1,348 @@
+<!DOCTYPE html>
+<html lang="en">
+    Licensed to the Apache Software Foundation (ASF) under one or more
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+    <img id="logo" alt="Apache Accumulo &trade;" src="/images/accumulo-logo.png"/>
+  </div>
+  <div id="content">
+    <h1 class="title">Apache Accumulo 1.5.3 Release Notes</h1>
+    <style type="text/css">
+/* The following code is added by
+   It was originally lifted from */
+ * Hide class="elementid-permalink", except when an enclosing heading
+ * has the :hover property.
+ */
+.headerlink, .elementid-permalink {
+  visibility: hidden;
+h2:hover > .headerlink, h3:hover > .headerlink, h1:hover > .headerlink, h6:hover
> .headerlink, h4:hover > .headerlink, h5:hover > .headerlink, dt:hover > .elementid-permalink
{ visibility: visible }</style>
+<p>Apache Accumulo 1.5.3 is a bug-fix release for the 1.5 series. It is likely to be
the last
+1.5 release, with development shifting towards newer release lines. We recommend upgrading
+to a newer version to continue to get bug fixes and new features.</p>
+<p>In the context of Accumulo's <a href="">Semantic Versioning</a>
<a href="">guidelines</a>,
+this is a "patch version". This means that there should be no public API changes. Any
+changes which were made were done in a backwards-compatible manner. Code that
+runs against 1.5.2 should run against 1.5.3.</p>
+<p>We'd like to thank all of the committers and contributors which had a part in
+making this release, from code contributions to testing. Everyone's efforts are
+greatly appreciated.</p>
+<h2 id="security-changes">Security Changes<a class="headerlink" href="#security-changes"
title="Permanent link">&para;</a></h2>
+<h3 id="sslv3-disabled-poodle"><a href="">SSLv3
disabled (POODLE)</a><a class="headerlink" href="#sslv3-disabled-poodle" title="Permanent
+<p>Many Accumulo services were capable of enabling wire encryption using
+SSL connectors. To be safe, <a href="">ACCUMULO-3316</a>
disables the problematic SSLv3 version by default which was
+potentially susceptible to the man-in-the-middle attack. <a href="">ACCUMULO-3317</a>
also disables SSLv3 in the monitor,
+so it will not accept SSLv3 client connections, when running it with https.</p>
+<h2 id="notable-bug-fixes">Notable Bug Fixes<a class="headerlink" href="#notable-bug-fixes"
title="Permanent link">&para;</a></h2>
+<h3 id="sourceswitchingiterator-deadlock"><a href="">SourceSwitchingIterator
Deadlock</a><a class="headerlink" href="#sourceswitchingiterator-deadlock" title="Permanent
+<p>An instance of SourceSwitchingIterator, the Accumulo iterator which transparently
+whether data for a tablet read from memory (the in-memory map) or disk (HDFS after a minor
+compaction), was found deadlocked in a production system.</p>
+<p>This deadlock prevented the scan and the minor compaction from ever successfully
+without restarting the tablet server. <a href="">ACCUMULO-3745</a>
fixes the inconsistent synchronization
+inside of the SourceSwitchingIterator to prevent this deadlock from happening in the future.</p>
+<p>The only mitigation of this bug was to restart the tablet server that is deadlocked.</p>
+<h3 id="table-flush-blocked-indefinitely"><a href="">Table
flush blocked indefinitely</a><a class="headerlink" href="#table-flush-blocked-indefinitely"
title="Permanent link">&para;</a></h3>
+<p>While running the Accumulo RandomWalk distributed test, it was observed that all
activity in
+Accumulo had stopped and there was an offline Accumulo metadata table tablet. The system
+tried to flush a user tablet, but the metadata table was not online (likely due to the agitation
+process which stops and starts Accumulo processes during the test). After this call, a call
+load the metadata tablet was queued but could not complete until the previous flush call.
+a deadlock occurred.</p>
+<p>This deadlock happened because the synchronous flush call could not complete before
the load
+tablet call completed, but the load tablet call couldn't run because of connection caching
+perform in Accumulo's RPC layer to reduce the quantity of sockets we need to create to send
+<a href="">ACCUMULO-3597</a>
prevents this deadlock by forcing the use of a non-cached connection for the RPC
+message requesting a metadata tablet to be loaded.</p>
+<p>While this feature does result in additional network resources to be used, the concern
is minimal
+because the number of metadata tablets is typically very small with respect to the total
number of
+tablets in the system.</p>
+<p>The only mitigation of this bug was to restart the tablet server that is hung.</p>
+<h3 id="rpc-connections-not-cached"><a href="">RPC
Connections not cached</a><a class="headerlink" href="#rpc-connections-not-cached"
title="Permanent link">&para;</a></h3>
+<p>It was observed that the underlying connection for invoking RPCs were not actually
being cached,
+despite it being requested that they should be cached. While this did not result in a noticed
+performance impact, it was deficiency. <a href="">ACCUMULO-3574</a>
ensures that connections are cached when
+it is requested that they are.</p>
+<h3 id="deletes-on-thrift-proxy-api-ignored"><a href="">Deletes
on Thrift Proxy API ignored</a><a class="headerlink" href="#deletes-on-thrift-proxy-api-ignored"
title="Permanent link">&para;</a></h3>
+<p>A user noted that when trying to specify a delete using the Accumulo Thrift Proxy,
the delete
+was treated as an update. <a href="">ACCUMULO-3474</a>
fixes the Proxy server such that deletes are properly
+respected as specified by the client.</p>
+<h2 id="other-changes">Other Changes<a class="headerlink" href="#other-changes"
title="Permanent link">&para;</a></h2>
+<p>Other changes for this version can be found <a href="">in
+<h2 id="testing">Testing<a class="headerlink" href="#testing" title="Permanent link">&para;</a></h2>
+<p>Each unit and functional test only runs on a single node, while the RandomWalk
+and Continuous Ingest tests run on any number of nodes. <em>Agitation</em> refers
+randomly restarting Accumulo processes and Hadoop DataNode processes, and, in
+HDFS High-Availability instances, forcing NameNode fail-over.</p>
+<p>During testing, multiple Accumulo developers noticed some stability issues
+with HDFS using Apache Hadoop 2.6.0 when restarting Accumulo processes and
+HDFS datanodes. The developers investigated these issues as a part of the
+normal release testing procedures, but were unable to find a definitive cause
+of these failures. Users are encouraged to follow
+<a href="">ACCUMULO-2388</a>
if they wish to follow any future developments.
+One possible workaround is to increase the <code>general.rpc.timeout</code> in
+Accumulo configuration from <code>120s</code> to <code>240s</code>.</p>
+<table id="release_notes_testing">
+  <tr>
+    <th>OS</th>
+    <th>Hadoop</th>
+    <th>Nodes</th>
+    <th>ZooKeeper</th>
+    <th>HDFS High-Availability</th>
+    <th>Tests</th>
+  </tr>
+  <tr>
+    <td>Gentoo</tdt>
+    <td>2.6.0</td>
+    <td>1</td>
+    <td>3.4.5</td>
+    <td>No</td>
+    <td>Unit and Integration Tests</td>
+  </tr>
+  <tr>
+    <td>Centos 6.5</tdt>
+    <td>2.7.1</td>
+    <td>6</td>
+    <td>3.4.5</td>
+    <td>No</td>
+    <td>Continuous Ingest and Verify</td>
+  </tr>
+  </div>
+  <div id="footer">
+    <a alt="Apache Software Foundation" href="">
+      <img id="asf-logo" alt="Apache Software Foundation" src="/images/feather-small.gif"
+    </a>
+    <div class="copyright">
+      <p>
+        Copyright &copy; 2011-2014 The Apache Software Foundation, Licensed under
+        the <a href="">Apache License, Version
+        Apache Accumulo, Accumulo, Apache, the Apache feather logo, and the Apache Accumulo
+        project logo are trademarks of the <a href="">Apache Software
Foundation</a>.<br />
+        Site created with <a href="">Bootstrap</a> including
icons from <a href="">GLYPHICONS</a> and <a href="">Font
+      </p>
+    </div> 
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