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From build...@apache.org
Subject svn commit: r951087 - in /websites/staging/accumulo/trunk/content: ./ release_notes/1.7.0.html
Date Tue, 12 May 2015 22:08:25 GMT
Author: buildbot
Date: Tue May 12 22:08:25 2015
New Revision: 951087

Log:
Staging update by buildbot for accumulo

Added:
    websites/staging/accumulo/trunk/content/release_notes/1.7.0.html
Modified:
    websites/staging/accumulo/trunk/content/   (props changed)

Propchange: websites/staging/accumulo/trunk/content/
------------------------------------------------------------------------------
--- cms:source-revision (original)
+++ cms:source-revision Tue May 12 22:08:25 2015
@@ -1 +1 @@
-1679111
+1679112

Added: websites/staging/accumulo/trunk/content/release_notes/1.7.0.html
==============================================================================
--- websites/staging/accumulo/trunk/content/release_notes/1.7.0.html (added)
+++ websites/staging/accumulo/trunk/content/release_notes/1.7.0.html Tue May 12 22:08:25 2015
@@ -0,0 +1,381 @@
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+-->
+
+  <div id="content">
+
+    <h1 class="title">Apache Accumulo 1.6.2 Release Notes</h1>
+
+    <p>Apache Accumulo 1.6.2 is a maintenance release on the 1.6 version branch.
+This release contains changes from over 150 issues, comprised of bug-fixes, performance
+improvements and better test cases. Apache Accumulo 1.6.2 is the first release since the
+community has adopted <a href="http://semver.org">Semantic Versioning</a> which
means that all changes to the <a href="https://github.com/apache/accumulo#api">public
API</a>
+are guaranteed to be made without adding to or removing from the public API. This ensures
+that client code that runs against 1.6.1 is guaranteed to run against 1.6.2 and vice versa.</p>
+<p>Users of 1.6.0 or 1.6.1 are strongly encouraged to update as soon as possible to
benefit from
+the improvements with very little concern in change of underlying functionality. Users of
1.4 or 1.6
+are seeking to upgrade to 1.6 should consider 1.6.2 the starting point over 1.6.0 or 1.6.1.
For
+information about improvements since Accumulo 1.5, see the <a href="http://accumulo.apache.org/release_notes/1.6.0.html">1.6.0</a>
and <a href="http://accumulo.apache.org/release_notes/1.6.1.html">1.6.1</a> release
notes.</p>
+<h2 id="notable-bug-fixes">Notable Bug Fixes</h2>
+<h3 id="only-first-zookeeper-server-is-used">Only first ZooKeeper server is used</h3>
+<p>In constructing a <code>ZooKeeperInstance</code>, the user provides
a comma-separated list of addresses for ZooKeeper
+servers. 1.6.0 and 1.6.1 incorrectly truncated the provided list of ZooKeeper servers used
to the first. This
+would cause clients to fail when the first ZooKeeper server in the list became unavailable
and not properly
+load balance requests to all available servers in the quorum. <a href="https://issues.apache.org/jira/browse/ACCUMULO-3218">ACCUMULO-3218</a>
fixes the parsing of
+the ZooKeeper quorum list to use all servers, not just the first.</p>
+<h3 id="incorrectly-handled-zookeeper-exception">Incorrectly handled ZooKeeper exception</h3>
+<p>Use of ZooKeeper's API requires very careful exception handling as some thrown exceptions
from the ZooKeeper
+API are considered "normal" and must be retried by the client. In 1.6.1, Accumulo improved
its handling of
+these "expected failures" to better insulate calls to ZooKeeper; however, the wrapper which
sets data to a ZNode
+incorrectly handled all cases. <a href="https://issues.apache.org/jira/browse/ACCUMULO-3448">ACCUMULO-3448</a>
fixed the implementation of <code>ZooUtil.putData(...)</code> to handle
+the expected error conditions correctly.</p>
+<h3 id="scanid-is-not-set-in-activescan"><code>scanId</code> is not set
in <code>ActiveScan</code></h3>
+<p>The <code>ActiveScan</code> class is the returned object by <code>InstanceOperations.listScans</code>.
This class represents a
+"scan" running on Accumulo servers, either from a <code>Scanner</code> or <code>BatchScanner</code>.
The <code>ActiveScan</code> class 
+is meant to represent all of the information that represents the scan and can be useful to
administrators
+or DevOps-types to observe and act on scans which are running for excessive periods of time.
<a href="https://issues.apache.org/jira/browse/ACCUMULO-2641">ACCUMULO-2641</a>
+fixes <code>ActiveScan</code> to ensure that the internal identifier <code>scanId</code>
is properly set.</p>
+<h3 id="table-state-change-doesnt-wait-when-requested">Table state change doesn't wait
when requested</h3>
+<p>An Accumulo table has two states: <code>ONLINE</code> and <code>OFFLINE</code>.
An offline table in Accumulo consumes no TabletServer
+resources, only HDFS resources, which makes it useful to save infrequently used data. The
Accumulo methods provided
+to transition a state from <code>ONLINE</code> to <code>OFFLINE</code>
and vice versa did not respect the <code>wait=true</code> parameter
+when set. <a href="https://issues.apache.org/jira/browse/ACCUMULO-3301">ACCUMULO-3301</a>
fixes the underlying implementation to ensure that when <code>wait=true</code>
is provided,
+the method will not return until the table's state transition has fully completed.</p>
+<h3 id="keyvalue-doesnt-implement-hashcode-or-equals">KeyValue doesn't implement <code>hashCode()</code>
or <code>equals()</code></h3>
+<p>The <code>KeyValue</code> class is an implementation of <code>Entry&lt;Key,Value&gt;</code>
which is returned by the classes like
+<code>Scanner</code> and <code>BatchScanner</code>. <a href="https://issues.apache.org/jira/browse/ACCUMULO-3217">ACCUMULO-3217</a>
adds these methods which ensure that the returned <code>Entry&lt;Key,Value&gt;</code>
+operates as expected with <code>HashMaps</code> and <code>HashSets</code>.
</p>
+<h3 id="potential-deadlock-in-tabletserver">Potential deadlock in TabletServer</h3>
+<p>Internal to the TabletServer, there are methods to construct instances of configuration
objects for tables
+and namespaces. The locking on these methods was not correctly implemented which created
the possibility to
+have concurrent requests to a TabletServer to deadlock. <a href="https://issues.apache.org/jira/browse/ACCUMULO-3372">ACCUMULO-3372</a>
found this problem while performing
+bulk imports of RFiles into Accumulo. Additional synchronization was added server-side to
prevent this deadlock
+from happening in the future.</p>
+<h3 id="the-datelexicoder-incorrectly-serialized-dates-prior-1970">The <code>DateLexicoder</code>
incorrectly serialized <code>Dates</code> prior 1970</h3>
+<p>The <code>DateLexicode</code>, a part of the <code>Lexicoders</code>
classes which implement methods to convert common type primitives
+into lexicographically sorting Strings/bytes, incorrectly converted <code>Date</code>
objects for dates prior to 1970.
+<a href="https://issues.apache.org/jira/browse/ACCUMULO-3385">ACCUMULO-3385</a>
fixed the <code>DateLexicoder</code> to correctly (de)serialize data <code>Date</code>
objects. For users with
+data stored in Accumulo using the broken implementation, the following can be performed to
read the old data.</p>
+<div class="codehilite"><pre>  <span class="n">Lexicoder</span> <span
class="n">lex</span> <span class="p">=</span> <span class="n">new</span>
<span class="n">ULongLexicoder</span><span class="p">();</span>
+  <span class="k">for</span> <span class="p">(</span><span class="n">Entry</span><span
class="o">&lt;</span><span class="n">Key</span><span class="p">,</span>
<span class="n">Value</span><span class="o">&gt;</span> <span
class="n">e</span> <span class="p">:</span> <span class="n">scanner</span><span
class="p">)</span> <span class="p">{</span>
+    <span class="n">Date</span> <span class="n">d</span> <span
class="p">=</span> <span class="n">new</span> <span class="n">Date</span><span
class="p">(</span><span class="n">lex</span><span class="p">.</span><span
class="n">decode</span><span class="p">(</span><span class="n">TextUtil</span><span
class="p">.</span><span class="n">getBytes</span><span class="p">(</span><span
class="n">e</span><span class="p">.</span><span class="n">getKey</span><span
class="p">().</span><span class="n">getRow</span><span class="p">())));</span>
+    <span class="o">//</span> <span class="p">...</span>
+  <span class="p">}</span>
+</pre></div>
+
+
+<h3 id="reduce-miniaccumulocluster-failures-due-to-random-port-allocations">Reduce
MiniAccumuloCluster failures due to random port allocations</h3>
+<p><code>MiniAccumuloCluster</code> has had issues where it fails to properly
start due to the way it attempts to choose
+a random, unbound port on the local machine to start the ZooKeeper and Accumulo processes.
Improvements have
+been made, including retry logic, to withstand a few failed port choices. The changes made
by <a href="https://issues.apache.org/jira/browse/ACCUMULO-3233">ACCUMULO-3233</a>
+and the related issues should eliminate sporadic failures users of <code>MiniAccumuloCluster</code>
might have observed.</p>
+<h3 id="tracer-doesnt-handle-trace-table-state-transition">Tracer doesn't handle trace
table state transition</h3>
+<p>The Tracer is an optional Accumulo server process that serializes Spans, elements
of a distributed trace,
+to the trace table for later inspection and correlation with other Spans. By default, the
Tracer writes
+to a "trace" table. In earlier versions of Accumulo, if this table was put offline, the Tracer
would fail
+to write new Spans to the table when it came back online. <a href="https://issues.apache.org/jira/browse/ACCUMULO-3351">ACCUMULO-3351</a>
ensures that the Tracer process
+will resume writing Spans to the trace table when it transitions to online after being offline.</p>
+<h3 id="tablet-not-major-compacting">Tablet not major compacting</h3>
+<p>It was noticed that a system performing many bulk imports, there was a tablet with
hundreds of files which
+was not major compacting nor was scheduled to be major compacted. <a href="https://issues.apache.org/jira/browse/ACCUMULO-3462">ACCUMULO-3462</a>
identified as fix
+server-side which would prevent this from happening in the future.</p>
+<h3 id="yarn-job-submission-fails-with-hadoop-260">YARN job submission fails with Hadoop-2.6.0</h3>
+<p>Hadoop 2.6.0 introduced a new component, the TimelineServer, which is a centralized
metrics service designed
+for other Hadoop components to leverage. MapReduce jobs submitted via <code>accumulo</code>
and <code>tool.sh</code> failed to
+run the job because it attempted to contact the TimelineServer and Accumulo was missing a
dependency on 
+the classpath to communicate with the TimelineServer. <a href="https://issues.apache.org/jira/browse/ACCUMULO-3230">ACCUMULO-3230</a>
updates the classpath in the example
+configuration files to include the necessary dependencies for the TimelineServer to ensure
that YARN job
+submission operates as previously.</p>
+<h2 id="performance-improvements">Performance Improvements</h2>
+<h3 id="user-scans-can-block-root-and-metadata-table-scans">User scans can block root
and metadata table scans</h3>
+<p>The TabletServer provides a feature to limit the number of open files as a resource
management configuration.
+To perform a scan against a normal table, the metadata and root table, when not cached, need
to be consulted
+first. With a sufficient number of concurrent scans against normal tables, adding to the
open file count,
+scans against the metadata and root tables could be blocked from running because no files
can be opened. 
+This prevents other system operations from happening as expected. <a href="https://issues.apache.org/jira/browse/ACCUMULO-3297">ACCUMULO-3297</a>
fixes the internal semaphore
+used to implement this resource management to ensure that root and metadata table scans can
proceed.</p>
+<h2 id="other-improvements">Other improvements</h2>
+<h3 id="limit-available-ciphers-for-ssltls">Limit available ciphers for SSL/TLS</h3>
+<p>Since Apache Accumulo 1.5.2 and 1.6.1, the <a href="http://en.wikipedia.org/wiki/POODLE">POODLE</a>
man-in-the-middle attack was found which exploits a client's
+ability to fallback to the SSLv3.0 protocol. The main mitigation strategy was to prevent
the use of old ciphers/protocols
+when using SSL connectors. In Accumulo, both the Apache Thrift RPC servers and Jetty server
for the Accumulo
+monitor have the ability to enable SSL. <a href="https://issues.apache.org/jira/browse/ACCUMULO-3316">ACCUMULO-3316</a>
is the parent issue which provides new configuration
+properties in accumulo-site.xml which can limit the accepted ciphers/protocols. By default,
insecure or out-dated
+protocols have been removed from the default set in order to protect users by default.</p>
+<h2 id="documentation">Documentation</h2>
+<p>Documentation was added to the Administration chapter for moving from a Non-HA Namenode
setup to an HA Namenode setup. 
+New chapters were added for the configuration of SSL and for summaries of Implementation
Details (initially describing 
+FATE operations). A section was added to the Configuration chapter for describing how to
arrive at optimal settings
+for configuring an instance with native maps.</p>
+<h2 id="testing">Testing</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 failover.
+<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>N/A</td>
+    <td>1</td>
+    <td>N/A</td>
+    <td>No</td>
+    <td>Unit and Integration Tests</td>
+  </tr>
+  <tr>
+    <td>Mac OSX</tdt>
+    <td>N/A</td>
+    <td>1</td>
+    <td>N/A</td>
+    <td>No</td>
+    <td>Unit and Integration Tests</td>
+  </tr>
+  <tr>
+    <td>Fedora 21</tdt>
+    <td>N/A</td>
+    <td>1</td>
+    <td>N/A</td>
+    <td>No</td>
+    <td>Unit and Integration Tests</td>
+  </tr>
+  <tr>
+    <td>CentOS 6</td>
+    <td>2.6</td>
+    <td>20</td>
+    <td>3.4.5</td>
+    <td>No</td>
+    <td>ContinuousIngest w/ verification w/ and w/o agitation (31B and 21B entries,
respectively)</td>
+  </tr>
+</table></p>
+  </div>
+
+  <div id="footer">
+    <a alt="Apache Software Foundation" href="http://www.apache.org">
+      <img id="asf-logo" alt="Apache Software Foundation" src="/images/feather-small.gif"
width="100">
+    </a>
+    <div class="copyright">
+      <p>
+        Copyright &copy; 2011-2014 The Apache Software Foundation, Licensed under
+        the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version
2.0</a>.
+        Apache Accumulo, Accumulo, Apache, the Apache feather logo, and the Apache Accumulo
+        project logo are trademarks of the <a href="http://www.apache.org">Apache Software
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