Author: buildbot
Date: Sat Sep 5 21:30:44 2015
New Revision: 964485
Log:
Staging update by buildbot for accumulo
Added:
websites/staging/accumulo/trunk/content/release_notes/1.5.4.html
Modified:
websites/staging/accumulo/trunk/content/ (props changed)
Propchange: websites/staging/accumulo/trunk/content/
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Added: websites/staging/accumulo/trunk/content/release_notes/1.5.4.html
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--- 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 @@
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+ <img id="logo" alt="Apache Accumulo ™"
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 mdx_elementid.py
+ It was originally lifted from http://subversion.apache.org/style/site.css */
+/*
+ * 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="http://semver.org";>Semantic
Versioning</a> <a
href="https://github.com/apache/accumulo/blob/1.7.0/README.md#api";>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">¶</a></h2>
+<h3 id="sslv3-disabled-poodle"><a
href="https://issues.apache.org/jira/browse/ACCUMULO-3316";>SSLv3 disabled
(POODLE)</a><a class="headerlink" href="#sslv3-disabled-poodle"
title="Permanent link">¶</a></h3>
+<p>Many Accumulo services were capable of enabling wire encryption using
+SSL connectors. To be safe, <a
href="https://issues.apache.org/jira/browse/ACCUMULO-3316";>ACCUMULO-3316</a>
disables the problematic SSLv3 version by default which was
+potentially susceptible to the man-in-the-middle attack. <a
href="https://issues.apache.org/jira/browse/ACCUMULO-3317";>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">¶</a></h2>
+<h3 id="sourceswitchingiterator-deadlock"><a
href="https://issues.apache.org/jira/browse/ACCUMULO-3745";>SourceSwitchingIterator
Deadlock</a><a class="headerlink" href="#sourceswitchingiterator-deadlock"
title="Permanent link">¶</a></h3>
+<p>An instance of SourceSwitchingIterator, the Accumulo iterator which
transparently manages
+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 completing
+without restarting the tablet server. <a
href="https://issues.apache.org/jira/browse/ACCUMULO-3745";>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="https://issues.apache.org/jira/browse/ACCUMULO-3597";>Table flush blocked
indefinitely</a><a class="headerlink" href="#table-flush-blocked-indefinitely"
title="Permanent link">¶</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 first
+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 to
+load the metadata tablet was queued but could not complete until the previous
flush call. Thus,
+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 we
+perform in Accumulo's RPC layer to reduce the quantity of sockets we need to
create to send data.
+<a
href="https://issues.apache.org/jira/browse/ACCUMULO-3597";>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="https://issues.apache.org/jira/browse/ACCUMULO-3574";>RPC Connections not
cached</a><a class="headerlink" href="#rpc-connections-not-cached"
title="Permanent link">¶</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="https://issues.apache.org/jira/browse/ACCUMULO-3574";>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="https://issues.apache.org/jira/browse/ACCUMULO-3474";>Deletes on Thrift
Proxy API ignored</a><a class="headerlink"
href="#deletes-on-thrift-proxy-api-ignored" title="Permanent
link">¶</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="https://issues.apache.org/jira/browse/ACCUMULO-3474";>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">¶</a></h2>
+<p>Other changes for this version can be found <a
href="https://issues.apache.org/jira/browse/ACCUMULO/fixforversion/12328662";>in
JIRA</a>.</p>
+<h2 id="testing">Testing<a class="headerlink" href="#testing" title="Permanent
link">¶</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 to
+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="https://issues.apache.org/jira/browse/ACCUMULO-2388";>ACCUMULO-2388</a> if
they wish to follow any future developments.
+One possible workaround is to increase the <code>general.rpc.timeout</code> in
the
+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>
+</table>
+ </div>
+
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+ <a alt="Apache Software Foundation" href="http://www.apache.org";>
+ <img id="asf-logo" alt="Apache Software Foundation"
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+ <div class="copyright">
+ <p>
+ Copyright © 2011-2014 The Apache Software Foundation, Licensed
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+ the <a href="http://www.apache.org/licenses/LICENSE-2.0";>Apache
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+ Apache Accumulo, Accumulo, Apache, the Apache feather logo, and the
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