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From ctubb...@apache.org
Subject [11/50] [abbrv] accumulo-website git commit: Jekyll build from gh-pages:358b7b4
Date Tue, 22 Nov 2016 19:41:08 GMT
http://git-wip-us.apache.org/repos/asf/accumulo-website/blob/c0655661/release_notes/1.6.5.html
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diff --git a/release_notes/1.6.5.html b/release_notes/1.6.5.html
index 32d2b20..1ba4d7f 100644
--- a/release_notes/1.6.5.html
+++ b/release_notes/1.6.5.html
@@ -1,324 +1,10 @@
 <!DOCTYPE html>
-<html lang="en">
-<head>
-<!--
-    Licensed to the Apache Software Foundation (ASF) under one or more
-    contributor license agreements.  See the NOTICE file distributed with
-    this work for additional information regarding copyright ownership.
-    The ASF licenses this file to You under the Apache License, Version 2.0
-    (the "License"); you may not use this file except in compliance with
-    the License.  You may obtain a copy of the License at
-
-       http://www.apache.org/licenses/LICENSE-2.0
-
-    Unless required by applicable law or agreed to in writing, software
-    distributed under the License is distributed on an "AS IS" BASIS,
-    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-    See the License for the specific language governing permissions and
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+<html lang="en-US">
 <meta charset="utf-8">
-<meta http-equiv="X-UA-Compatible" content="IE=edge">
-<meta name="viewport" content="width=device-width, initial-scale=1">
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-<link href="//netdna.bootstrapcdn.com/font-awesome/4.0.3/css/font-awesome.css" rel="stylesheet">
-<link rel="stylesheet" type="text/css" href="https://cdn.datatables.net/v/bs/jq-2.2.3/dt-1.10.12/datatables.min.css">
-<link href="/css/accumulo.css" rel="stylesheet" type="text/css">
-
-<title>Apache Accumulo 1.6.5 Release Notes</title>
-
-<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>
-<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script>
-<script type="text/javascript" src="https://cdn.datatables.net/v/bs/jq-2.2.3/dt-1.10.12/datatables.min.js"></script>
-<script>
-  // show location of canonical site if not currently on the canonical site
-  $(function() {
-    var host = window.location.host;
-    if (typeof host !== 'undefined' && host !== 'accumulo.apache.org') {
-      $('#non-canonical').show();
-    }
-  });
-
-  $(function() {
-    // decorate section headers with anchors
-    return $("h2, h3, h4, h5, h6").each(function(i, el) {
-      var $el, icon, id;
-      $el = $(el);
-      id = $el.attr('id');
-      icon = '<i class="fa fa-link"></i>';
-      if (id) {
-        return $el.append($("<a />").addClass("header-link").attr("href", "#" + id).html(icon));
-      }
-    });
-  });
-  
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-  (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
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-  })(window,document,'script','//www.google-analytics.com/analytics.js','ga');
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-  <nav class="navbar navbar-default navbar-fixed-top">
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-      <a href="/"><img id="nav-logo" alt="Apache Accumulo" class="img-responsive" src="/images/accumulo-logo.png" width="200"/></a>
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-      <ul class="nav navbar-nav">
-        <li class="nav-link"><a href="/downloads">Download</a></li>
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-          <li class="dropdown-header">1.8.0 Release (Latest)</li>
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-          <li class="dropdown-header">1.7.2 Release</li>
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-          <li><a href="/1.7/accumulo_user_manual">User Manual</a></li>
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-          <li class="dropdown-header">1.6.6 Release</li>
-          <li><a href="/release_notes/1.6.6">Release Notes</a></li>
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-          Visit the official site at: <a href="https://accumulo.apache.org">https://accumulo.apache.org</a>
-        </div>
-        <div id="content">
-          
-          <h1 class="title">Apache Accumulo 1.6.5 Release Notes</h1>
-          
-          <p>Apache Accumulo 1.6.5 is a maintenance release on the 1.6 version branch. This
-release contains changes from 55 issues, comprised of bug-fixes, performance
-improvements, build quality improvements, and more. See <a href="https://issues.apache.org/jira/browse/ACCUMULO/fixforversion/12333674">JIRA</a> for a
-complete list.</p>
-
-<p>Users of any previous 1.6.x release 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 1.5 that are seeking to upgrade to 1.6
-should consider 1.6.5 as a starting point.</p>
-
-<h2 id="outstanding-known-issues">Outstanding Known Issues</h2>
-
-<p>Be aware that a small documentation bug exists with the compact command in the
-shell (<a href="https://issues.apache.org/jira/browse/ACCUMULO-4138">ACCUMULO-4138</a>). The documentation for the begin row and
-end row should be described as exclusive and inclusive, respectively, rather
-than the incorrect description of both being inclusive.</p>
-
-<h2 id="highlights">Highlights</h2>
-
-<h3 id="queued-compactions-not-running">Queued Compactions Not Running</h3>
-
-<p>Found and fixed a bug (<a href="https://issues.apache.org/jira/browse/ACCUMULO-4016">ACCUMULO-4016</a>) in which some queued
-compactions would never run if the number of files changed while the tablet was
-queued.</p>
-
-<h3 id="faster-processing-of-conditional-mutations">Faster Processing of Conditional Mutations</h3>
-
-<p>Improved ConditionalMutation processing time by a factor of 3.
-(<a href="https://issues.apache.org/jira/browse/ACCUMULO-4066">ACCUMULO-4066</a>)</p>
-
-<h3 id="slow-gc-while-bulk-importing">Slow GC While Bulk Importing</h3>
-
-<p>Found and worked around an issue where lots of bulk imports creating many new
-files would significantly impair the Accumulo GC service, and possibly prevent
-it from running to completion entirely. (<a href="https://issues.apache.org/jira/browse/ACCUMULO-4021">ACCUMULO-4021</a>)</p>
-
-<h3 id="improvements-in-locating-client-configuration-file">Improvements in Locating Client Configuration File</h3>
-
-<p>Fixed some unexpected error messages related to setting
-ACCUMULO_CLIENT_CONF_PATH, and improved the detection of the client.conf file if
-ACCUMULO_CLIENT_CONF_PATH was set to a directory containing client.conf.
-(<a href="https://issues.apache.org/jira/browse/ACCUMULO-4026">ACCUMULO-4026</a>,<a href="https://issues.apache.org/jira/browse/ACCUMULO-4027">ACCUMULO-4027</a>)</p>
-
-<h3 id="transient-zookeeper-disconnect-causes-fate-threads-to-exit">Transient ZooKeeper disconnect causes FATE threads to exit</h3>
-
-<p>ZooKeeper clients are expected to handle the situation where they become
-disconnected from the ZooKeeper server and must wait to be reconnected
-before continuing ZooKeeper operations.</p>
-
-<p>The dedicated threads running inside the Accumulo Master process for FATE
-actions had the potential unexpectedly exit in this disconnected state.
-This caused a scenario where all future FATE-based operations would
-be blocked until the Accumulo Master process was restarted. (<a href="https://issues.apache.org/jira/browse/ACCUMULO-4060">ACCUMULO-4060</a>)</p>
-
-<h3 id="incorrect-management-of-certain-apache-thrift-rpcs">Incorrect management of certain Apache Thrift RPCs</h3>
-
-<p>Accumulo relies on Apache Thrift to implement remote procedure calls between
-Accumulo services. Accumulo’s use of Thrift uncovered an unfortunate situation
-where a special RPC (a “oneway” call) would leave unwanted data on the underlying
-Thrift connection. After this extra data was left on connection, all subsequent RPCs
-re-using that connection would fail with “out of sequence response” error messages.
-Accumulo would be left in a bad state until the mishandled connections were released
-or Accumulo services were restarted. (<a href="https://issues.apache.org/jira/browse/ACCUMULO-4065">ACCUMULO-4065</a>)</p>
-
-<h2 id="other-notable-changes">Other Notable Changes</h2>
-
-<ul>
-  <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3509">ACCUMULO-3509</a> Fixed some lock contention in TabletServer, preventing resource cleanup</li>
-  <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3734">ACCUMULO-3734</a> Fixed quote-escaping bug in VisibilityConstraint</li>
-  <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-4025">ACCUMULO-4025</a> Fixed cleanup of bulk load fate transactions</li>
-  <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-4070">ACCUMULO-4070</a> Fixed Kerberos ticket renewal for all Accumulo services</li>
-  <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-4098">ACCUMULO-4098</a>,<a href="https://issues.apache.org/jira/browse/ACCUMULO-4113">ACCUMULO-4113</a> Fixed widespread misuse of ByteBuffer</li>
-</ul>
-
-<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.</p>
-
-<table id="release_notes_testing" class="table">
-  <thead>
-    <tr>
-      <th>OS</th>
-      <th>Hadoop</th>
-      <th>Nodes</th>
-      <th>ZooKeeper</th>
-      <th>HDFS HA</th>
-      <th>Tests</th>
-    </tr>
-  </thead>
-  <tbody>
-    <tr>
-      <td>CentOS 7.1</td>
-      <td>2.6.3</td>
-      <td>9</td>
-      <td>3.4.6</td>
-      <td>No</td>
-      <td>Random walk (All.xml) 18-hour run (2 failures, both conflicting operations on same table in Concurrent test)</td>
-    </tr>
-    <tr>
-      <td>CentOS 7.1</td>
-      <td>2.6.3</td>
-      <td>6</td>
-      <td>3.4.6</td>
-      <td>No</td>
-      <td>Continuous ingest with agitation (2B entries)</td>
-    </tr>
-    <tr>
-      <td>CentOS 6.7</td>
-      <td>2.2.0 and 1.2.1</td>
-      <td>1</td>
-      <td>3.3.6</td>
-      <td>No</td>
-      <td>All unit and integration tests</td>
-    </tr>
-    <tr>
-      <td>CentOS 7.1 (Oracle JDK8)</td>
-      <td>2.6.3</td>
-      <td>9</td>
-      <td>3.4.6</td>
-      <td>No</td>
-      <td>Continuous ingest with agitation (24hrs, 32B entries verified) on EC2 (1 m3.xlarge leader; 8 d2.xlarge workers)</td>
-    </tr>
-  </tbody>
-</table>
-
-
-        </div>
-
-        
-<footer>
-
-  <p><a href="https://www.apache.org"><img src="/images/feather-small.gif" alt="Apache Software Foundation" id="asf-logo" height="100" /></a></p>
-
-  <p>Copyright © 2011-2016 The Apache Software Foundation. Licensed under the <a href="https://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p>
-
-</footer>
-
-
-      </div>
-    </div>
-  </div>
-</body>
+<title>Redirecting…</title>
+<link rel="canonical" href="https://accumulo.apache.org/release/accumulo-1.6.5/">
+<meta http-equiv="refresh" content="0; url=https://accumulo.apache.org/release/accumulo-1.6.5/">
+<h1>Redirecting…</h1>
+<a href="https://accumulo.apache.org/release/accumulo-1.6.5/">Click here if you are not redirected.</a>
+<script>location="https://accumulo.apache.org/release/accumulo-1.6.5/"</script>
 </html>

http://git-wip-us.apache.org/repos/asf/accumulo-website/blob/c0655661/release_notes/1.6.6.html
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diff --git a/release_notes/1.6.6.html b/release_notes/1.6.6.html
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@@ -1,331 +1,10 @@
 <!DOCTYPE html>
-<html lang="en">
-<head>
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-    Licensed to the Apache Software Foundation (ASF) under one or more
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-    (the "License"); you may not use this file except in compliance with
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-
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-
-    Unless required by applicable law or agreed to in writing, software
-    distributed under the License is distributed on an "AS IS" BASIS,
-    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+<html lang="en-US">
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-<meta http-equiv="X-UA-Compatible" content="IE=edge">
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-<link href="//netdna.bootstrapcdn.com/font-awesome/4.0.3/css/font-awesome.css" rel="stylesheet">
-<link rel="stylesheet" type="text/css" href="https://cdn.datatables.net/v/bs/jq-2.2.3/dt-1.10.12/datatables.min.css">
-<link href="/css/accumulo.css" rel="stylesheet" type="text/css">
-
-<title>Apache Accumulo 1.6.6 Release Notes</title>
-
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-<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script>
-<script type="text/javascript" src="https://cdn.datatables.net/v/bs/jq-2.2.3/dt-1.10.12/datatables.min.js"></script>
-<script>
-  // show location of canonical site if not currently on the canonical site
-  $(function() {
-    var host = window.location.host;
-    if (typeof host !== 'undefined' && host !== 'accumulo.apache.org') {
-      $('#non-canonical').show();
-    }
-  });
-
-  $(function() {
-    // decorate section headers with anchors
-    return $("h2, h3, h4, h5, h6").each(function(i, el) {
-      var $el, icon, id;
-      $el = $(el);
-      id = $el.attr('id');
-      icon = '<i class="fa fa-link"></i>';
-      if (id) {
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-      }
-    });
-  });
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-      </button>
-      <a href="/"><img id="nav-logo" alt="Apache Accumulo" class="img-responsive" src="/images/accumulo-logo.png" width="200"/></a>
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-          <li><a href="/1.8/examples">Examples</a></li>
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-          <h1 class="title">Apache Accumulo 1.6.6 Release Notes</h1>
-          
-          <p>Apache Accumulo 1.6.6 is a maintenance release on the 1.6 version branch. This
-release contains changes from more than 40 issues, comprised of bug-fixes,
-performance improvements, build quality improvements, and more. See
-<a href="https://issues.apache.org/jira/secure/ReleaseNote.jspa?projectId=12312121&amp;version=12334846">JIRA</a> for a complete list.</p>
-
-<p>Users of any previous 1.6.x release are strongly encouraged to update as soon
-as possible to benefit from the improvements with very little concern in change
-of underlying functionality.</p>
-
-<p>As of this release, active development has ceased for the 1.6 release line, so
-users should consider upgrading to a newer, actively maintained version when
-they can. While the developers may release another 1.6 version to address a
-severe issue, there’s a strong possibility that this will be the last 1.6
-release. That would also mean that this will be the last Accumulo version to
-support Java 6 and Hadoop 1.</p>
-
-<h2 id="highlights">Highlights</h2>
-
-<h3 id="write-ahead-logs-can-be-prematurely-deleted">Write-Ahead Logs can be prematurely deleted</h3>
-
-<p>There were cases where the Accumulo Garbage Collector may inadvertently delete
-a WAL for a tablet server that it has erroneously determined to be down,
-causing data loss. This has been corrected. See <a href="https://issues.apache.org/jira/browse/ACCUMULO-4157">ACCUMULO-4157</a>
-for additional detail.</p>
-
-<h3 id="upgrade-to-commons-vfs-21">Upgrade to Commons-VFS 2.1</h3>
-
-<p>Upgrading to Apache Commons VFS 2.1 fixes several issues with classloading out
-of HDFS. For further detail see <a href="https://issues.apache.org/jira/browse/ACCUMULO-4146">ACCUMULO-4146</a>. Additional
-fixes to a potential HDFS class loading deadlock situation were made in
-<a href="https://issues.apache.org/jira/browse/ACCUMULO-4341">ACCUMULO-4341</a>.</p>
-
-<h3 id="native-map-failed-to-increment-mutation-count-properly">Native Map failed to increment mutation count properly</h3>
-
-<p>There was a bug (<a href="https://issues.apache.org/jira/browse/ACCUMULO-4148">ACCUMULO-4148</a>) where multiple put calls with
-identical keys and no timestamp would exhibit different behaviour depending on
-whether native maps were enabled or not. This behaviour would result in hidden
-mutations with native maps, and has been corrected.</p>
-
-<h3 id="open-wal-files-could-prevent-datanode-decomission">Open WAL files could prevent DataNode decomission</h3>
-
-<p>An improvement was introduced to allow a max age before WAL files would be
-automatically rolled. Without a max age, they could stay open for writing
-indefinitely, blocking the Hadoop DataNode decomissioning process. For more
-information, see <a href="https://issues.apache.org/jira/browse/ACCUMULO-4004">ACCUMULO-4004</a>.</p>
-
-<h3 id="remove-unnecessary-copy-of-cached-rfile-index-blocks">Remove unnecessary copy of cached RFile index blocks</h3>
-
-<p>Accumulo maintains an cache for file blocks in-memory as a performance
-optimization. This can be done safely because Accumulo RFiles are immutable,
-thus their blocks are also immutable. There are two types of these blocks:
-index and data blocks. Index blocks refer to the b-tree style index inside of
-each Accumulo RFile, while data blocks contain the sorted Key-Value pairs. In
-previous versions, when Accumulo extracted an Index block from the in-memory
-cache, it would copy the data. <a href="https://issues.apache.org/jira/browse/ACCUMULO-4164">ACCUMULO-4164</a> removes this
-unnecessary copy as the contents are immutable and can be passed by reference.
-Ensuring that the Index blocks are not copied when accessed from the cache is a
-big performance gain at the file-access level.</p>
-
-<h3 id="analyze-key-length-to-avoid-choosing-large-keys-for-rfile-index-blocks">Analyze Key-length to avoid choosing large Keys for RFile Index blocks</h3>
-
-<p>Accumulo’s RFile index blocks are made up of a Key which exists in the file and
-points to that specific location in the corresponding RFile data block. Thus,
-the size of the RFile index blocks is largely dominated by the size of the Keys
-which are used by the index. <a href="https://issues.apache.org/jira/browse/ACCUMULO-4314">ACCUMULO-4314</a> is an improvement
-which uses statistics on the length of the Keys in the Rfile to avoid choosing
-Keys for the index whose length is greater than three standard deviations for
-the RFile. By choosing smaller Keys for the index, Accumulo can access the
-RFile index faster and keep more Index blocks cached in memory. Initial tests
-showed that with this change, the RFile index size was nearly cut in half.</p>
-
-<h3 id="gson-version-bump">Gson version bump</h3>
-
-<p>Due to an <a href="https://github.com/google/gson/issues/362">upstream bug with Gson 2.2.2</a>, we’ve bumped our bundled
-dependency (<a href="https://issues.apache.org/jira/browse/ACCUMULO-4345">ACCUMULO-4345</a>) to version 2.2.4. Please take note
-of this when you upgrade, if you were using the version shipped with Accumulo,
-and were relying on the buggy behavior in the previous version in your own
-code.</p>
-
-<h3 id="minor-performance-improvements">Minor performance improvements.</h3>
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-<p>A performance issue was identified and corrected
-(<a href="https://issues.apache.org/jira/browse/ACCUMULO-1755">ACCUMULO-1755</a>) where the BatchWriter would block calls to
-addMutation while looking up destination tablet server metadata. The writer has
-been fixed to allow both operations in parallel.</p>
-
-<h2 id="other-notable-changes">Other Notable Changes</h2>
-
-<ul>
-  <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-4155">ACCUMULO-4155</a> No longer publish javadoc for non-public API
-to website. (Still available in javadoc jars in maven)</li>
-  <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-4334">ACCUMULO-4334</a> Ingest rates reported through JMX did not
-match rates reported by Monitor.</li>
-  <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-4335">ACCUMULO-4335</a> Error conditions that result in a Halt should
-ensure non-zero process exit code.</li>
-</ul>
-
-<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.</p>
-
-<table id="release_notes_testing" class="table">
-  <thead>
-    <tr>
-      <th>OS/Environment</th>
-      <th>Hadoop</th>
-      <th>Nodes</th>
-      <th>ZooKeeper</th>
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-      <th>Tests</th>
-    </tr>
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-      <td>CentOS 7</td>
-      <td>1.2.1</td>
-      <td>1</td>
-      <td>3.3.6</td>
-      <td>No</td>
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-    </tr>
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-      <td>CentOS 7</td>
-      <td>2.2.0</td>
-      <td>1</td>
-      <td>3.3.6</td>
-      <td>No</td>
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-milestone features which expand the functionality of Accumulo. These include
-features related to security, availability, and extensibility. Nearly 700 JIRA
-issues were resolved in this version. Approximately two-thirds were bugs and
-one-third were improvements.</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 “minor version”. This means that new APIs have been created, some
-deprecations may have been added, but no deprecated APIs have been removed.
-Code written against 1.6.x should work against 1.7.0, likely binary-compatible
-but definitely source-compatible. As always, the Accumulo developers take API compatibility
-very seriously and have invested much time to ensure that we meet the promises set forth to our users.</p>
-
-<h1 id="major-changes">Major Changes</h1>
-
-<h2 id="updated-minimum-requirements">Updated Minimum Requirements</h2>
-
-<p>Apache Accumulo 1.7.0 comes with an updated set of minimum requirements.</p>
-
-<ul>
-  <li>Java7 is required. Java6 support is dropped.</li>
-  <li>Hadoop 2.2.0 or greater is required. Hadoop 1.x support is dropped.</li>
-  <li>ZooKeeper 3.4.x or greater is required.</li>
-</ul>
-
-<h2 id="client-authentication-with-kerberos">Client Authentication with Kerberos</h2>
-
-<p>Kerberos is the de-facto means to provide strong authentication across Hadoop
-and other related components. Kerberos requires a centralized key distribution
-center to authentication users who have credentials provided by an
-administrator. When Hadoop is configured for use with Kerberos, all users must
-provide Kerberos credentials to interact with the filesystem, launch YARN
-jobs, or even view certain web pages.</p>
-
-<p>While Accumulo has long supported operating on Kerberos-enabled HDFS, it still
-required Accumulo users to use password-based authentication to authenticate
-with Accumulo. <a href="https://issues.apache.org/jira/browse/ACCUMULO-2815">ACCUMULO-2815</a> added support for allowing
-Accumulo clients to use the same Kerberos credentials to authenticate to
-Accumulo that they would use to authenticate to other Hadoop components,
-instead of a separate user name and password just for Accumulo.</p>
-
-<p>This authentication leverages <a href="https://en.wikipedia.org/wiki/Simple_Authentication_and_Security_Layer">Simple Authentication and Security Layer
-(SASL)</a> and <a href="https://en.wikipedia.org/wiki/Generic_Security_Services_Application_Program_Interface">GSSAPI</a> to support Kerberos authentication over the
-existing Apache Thrift-based RPC infrastructure that Accumulo employs.</p>
-
-<p>These additions represent a significant forward step for Accumulo, bringing
-its client-authentication up to speed with the rest of the Hadoop ecosystem.
-This results in a much more cohesive authentication story for Accumulo that
-resonates with the battle-tested cell-level security and authorization model
-already familiar to Accumulo users.</p>
-
-<p>More information on configuration, administration, and application of Kerberos
-client authentication can be found in the <a href="/1.7/accumulo_user_manual#_kerberos">Kerberos chapter</a> of the
-Accumulo User Manual.</p>
-
-<h2 id="data-center-replication">Data-Center Replication</h2>
-
-<p>In previous releases, Accumulo only operated within the constraints of a
-single installation. Because single instances of Accumulo often consist of
-many nodes and Accumulo’s design scales (near) linearly across many nodes, it
-is typical that one Accumulo is run per physical installation or data-center.
-<a href="https://issues.apache.org/jira/browse/ACCUMULO-378">ACCUMULO-378</a> introduces support in Accumulo to automatically
-copy data from one Accumulo instance to another.</p>
-
-<p>This data-center replication feature is primarily applicable to users wishing
-to implement a disaster recovery strategy. Data can be automatically copied
-from a primary instance to one or more other Accumulo instances. In contrast
-to normal Accumulo operation, in which ingest and query are strongly
-consistent, data-center replication is a lazy, eventually consistent
-operation. This is desirable for replication, as it prevents additional
-latency for ingest operations on the primary instance. Additionally, the
-implementation of this feature can sustain prolonged outages between the
-primary instance and replicas without any administrative overhead.</p>
-
-<p>The Accumulo User Manual contains a <a href="/1.7/accumulo_user_manual#_replication">new chapter on replication</a>
-which details the design and implementation of the feature, explains how users
-can configure replication, and describes special cases to consider when
-choosing to integrate the feature into a user application.</p>
-
-<h2 id="user-initiated-compaction-strategies">User-Initiated Compaction Strategies</h2>
-
-<p>Per-table compaction strategies were added in 1.6.0 to provide custom logic to
-decide which files are involved in a major compaction. In 1.7.0, the ability
-to specify a compaction strategy for a user-initiated compaction was added in
-<a href="https://issues.apache.org/jira/browse/ACCUMULO-1798">ACCUMULO-1798</a>. This allows surgical compactions on a subset
-of tablet files. Previously, a user-initiated compaction would compact all
-files in a tablet.</p>
-
-<p>In the Java API, this new feature can be accessed in the following way:</p>
-
-<div class="highlighter-rouge"><pre class="highlight"><code>Connection conn = ...
-CompactionStrategyConfig csConfig = new CompactionStrategyConfig(strategyClassName).setOptions(strategyOpts);
-CompactionConfig compactionConfig = new CompactionConfig().setCompactionStrategy(csConfig);
-connector.tableOperations().compact(tableName, compactionConfig)
-</code></pre>
-</div>
-
-<p>In <a href="https://issues.apache.org/jira/browse/ACCUMULO-3134">ACCUMULO-3134</a>, the shell’s <code class="highlighter-rouge">compact</code> command was modified
-to enable selecting which files to compact based on size, name, and path.
-Options were also added to the shell’s compaction command to allow setting
-RFile options for the compaction output. Setting the output options could be
-useful for testing. For example, one tablet to be compacted using snappy
-compression.</p>
-
-<p>The following is an example shell command that compacts all files less than
-10MB, if the tablet has at least two files that meet this criteria. If a
-tablet had a 100MB, 50MB, 7MB, and 5MB file then the 7MB and 5MB files would
-be compacted. If a tablet had a 100MB and 5MB file, then nothing would be done
-because there are not at least two files meeting the selection criteria.</p>
-
-<div class="highlighter-rouge"><pre class="highlight"><code>compact -t foo --min-files 2 --sf-lt-esize 10M
-</code></pre>
-</div>
-
-<p>The following is an example shell command that compacts all bulk imported
-files in a table.</p>
-
-<div class="highlighter-rouge"><pre class="highlight"><code>compact -t foo --sf-ename I.*
-</code></pre>
-</div>
-
-<p>These provided convenience options to select files execute using a specialized
-compaction strategy. Options were also added to the shell to specify an
-arbitrary compaction strategy. The option to specify an arbitrry compaction
-strategy is mutually exclusive with the file selection and file creation
-options, since those options are unique to the specialized compaction strategy
-provided. See <code class="highlighter-rouge">compact --help</code> in the shell for the available options.</p>
-
-<h2 id="api-clarification">API Clarification</h2>
-
-<p>The declared API in 1.6.x was incomplete. Some important classes like
-ColumnVisibility were not declared as Accumulo API. Significant work was done
-under <a href="https://issues.apache.org/jira/browse/ACCUMULO-3657">ACCUMULO-3657</a> to correct the API statement and clean up
-the API to be representative of all classes which users are intended to
-interact with. The expanded and simplified API statement is in the
-<a href="https://github.com/apache/accumulo/blob/1.7.0/README.md#api">README</a>.</p>
-
-<p>In some places in the API, non-API types were used. Ideally, public API
-members would only use public API types. A tool called <a href="http://code.revelc.net/apilyzer-maven-plugin">APILyzer</a>
-was created to find all API members that used non-API types. Many of the
-violations found by this tool were deprecated to clearly communicate that a
-non-API type was used. One example is a public API method that returned a
-class called <code class="highlighter-rouge">KeyExtent</code>. <code class="highlighter-rouge">KeyExtent</code> was never intended to be in the public
-API because it contains code related to Accumulo internals. <code class="highlighter-rouge">KeyExtent</code> and
-the API methods returning it have since been deprecated. These were replaced
-with a new class for identifying tablets that does not expose internals.
-Deprecating a type like this from the API makes the API more stable while also
-making it easier for contributors to change Accumulo internals without
-impacting the API.</p>
-
-<p>The changes in <a href="https://issues.apache.org/jira/browse/ACCUMULO-3657">ACCUMULO-3657</a> also included an Accumulo API
-regular expression for use with checkstyle. Starting with 1.7.0, projects
-building on Accumulo can use this checkstyle rule to ensure they are only
-using Accumulo’s public API. The regular expression can be found in the
-<a href="https://github.com/apache/accumulo/blob/1.7.0/README.md#api">README</a>.</p>
-
-<h1 id="performance-improvements">Performance Improvements</h1>
-
-<h2 id="configurable-threadpool-size-for-assignments">Configurable Threadpool Size for Assignments</h2>
-
-<p>During start-up, the Master quickly assigns tablets to Tablet Servers. However,
-Tablet Servers load those assigned tablets one at a time. In 1.7, the servers
-will be more aggressive, and will load tablets in parallel, so long as they do
-not have mutations that need to be recovered.</p>
-
-<p><a href="https://issues.apache.org/jira/browse/ACCUMULO-1085">ACCUMULO-1085</a> allows the size of the threadpool used in the Tablet Servers 
-for assignment processing to be configurable.</p>
-
-<h2 id="group-commit-threshold-as-a-factor-of-data-size">Group-Commit Threshold as a Factor of Data Size</h2>
-
-<p>When ingesting data into Accumulo, the majority of time is spent in the
-write-ahead log. As such, this is a common place that optimizations are added.
-One optimization is known as “group-commit”. When multiple clients are
-writing data to the same Accumulo tablet, it is not efficient for each of them
-to synchronize the WAL, flush their updates to disk for durability, and then
-release the lock. The idea of group-commit is that multiple writers can queue
-the write for their mutations to the WAL and then wait for a sync that will
-satisfy the durability constraints of their batch of updates. This has a
-drastic improvement on performance, since many threads writing batches
-concurrently can “share” the same <code class="highlighter-rouge">fsync</code>.</p>
-
-<p>In previous versions, Accumulo controlled the frequency in which this
-group-commit sync was performed as a factor of the number of clients writing
-to Accumulo. This was both confusing to correctly configure and also
-encouraged sub-par performance with few write threads.
-<a href="https://issues.apache.org/jira/browse/ACCUMULO-1950">ACCUMULO-1950</a> introduced a new configuration property
-<code class="highlighter-rouge">tserver.total.mutation.queue.max</code> which defines the amount of data that is
-queued before a group-commit is performed in such a way that is agnostic of
-the number of writers. This new configuration property is much easier to
-reason about than the previous (now deprecated) <code class="highlighter-rouge">tserver.mutation.queue.max</code>.
-Users who have set <code class="highlighter-rouge">tserver.mutation.queue.max</code> in the past are encouraged
-to start using the new <code class="highlighter-rouge">tserver.total.mutation.queue.max</code> property.</p>
-
-<h1 id="other-improvements">Other improvements</h1>
-
-<h2 id="balancing-groups-of-tablets">Balancing Groups of Tablets</h2>
-
-<p>By default, Accumulo evenly spreads each table’s tablets across a cluster. In
-some situations, it is advantageous for query or ingest to evenly spreads
-groups of tablets within a table. For <a href="https://issues.apache.org/jira/browse/ACCUMULO-3439">ACCUMULO-3439</a>, a new
-balancer was added to evenly spread groups of tablets to optimize performance.
-This <a href="https://blogs.apache.org/accumulo/entry/balancing_groups_of_tablets">blog post</a> provides more details about when and why
-users may desire to leverage this feature..</p>
-
-<h2 id="user-specified-durability">User-specified Durability</h2>
-
-<p>Accumulo constantly tries to balance durability with performance. Guaranteeing
-durability of every write to Accumulo is very difficult in a
-massively-concurrent environment that requires high throughput. One common
-area of focus is the write-ahead log, since it must eventually call <code class="highlighter-rouge">fsync</code> on
-the local filesystem to guarantee that data written is durable in the face of
-unexpected power failures. In some cases where durability can be sacrificed,
-either due to the nature of the data itself or redundant power supplies,
-ingest performance improvements can be attained.</p>
-
-<p>Prior to 1.7, a user could only configure the level of durability for
-individual tables. With the implementation of <a href="https://issues.apache.org/jira/browse/ACCUMULO-1957">ACCUMULO-1957</a>,
-the durability can be specified by the user when creating a <code class="highlighter-rouge">BatchWriter</code>,
-giving users control over durability at the level of the individual writes.
-Every <code class="highlighter-rouge">Mutation</code> written using that <code class="highlighter-rouge">BatchWriter</code> will be written with the
-provided durability. This can result in substantially faster ingest rates when
-the durability can be relaxed.</p>
-
-<h2 id="waitforbalance-api">waitForBalance API</h2>
-
-<p>When creating a new Accumulo table, the next step is typically adding splits
-to that table before starting ingest. This can be extremely important since a
-table without any splits will only be hosted on a single tablet server and
-create a ingest bottleneck until the table begins to naturally split. Adding
-many splits before ingesting will ensure that a table is distributed across
-many servers and result in high throughput when ingest first starts.</p>
-
-<p>Adding splits to a table has long been a synchronous operation, but the
-assignment of those splits was asynchronous. A large number of splits could be
-processed, but it was not guaranteed that they would be evenly distributed
-resulting in the same problem as having an insufficient number of splits.
-<a href="https://issues.apache.org/jira/browse/ACCUMULO-2998">ACCUMULO-2998</a> adds a new method to <code class="highlighter-rouge">InstanceOperations</code> which
-allows users to wait for all tablets to be balanced. This method lets users
-wait until tablets are appropriately distributed so that ingest can be run at
-full-bore immediately.</p>
-
-<h2 id="hadoop-metrics2-support">Hadoop Metrics2 Support</h2>
-
-<p>Accumulo has long had its own metrics system implemented using Java MBeans.
-This enabled metrics to be reported by Accumulo services, but consumption by
-other systems often required use of an additional tool like jmxtrans to read
-the metrics from the MBeans and send them to some other system.</p>
-
-<p><a href="https://issues.apache.org/jira/browse/ACCUMULO-1817">ACCUMULO-1817</a> replaces this custom metrics system Accumulo
-with Hadoop Metrics2. Metrics2 has a number of benefits, the most common of
-which is invalidating the need for an additional process to send metrics to
-common metrics storage and visualization tools. With Metrics2 support,
-Accumulo can send its metrics to common tools like Ganglia and Graphite.</p>
-
-<p>For more information on enabling Hadoop Metrics2, see the <a href="/1.7/accumulo_user_manual#_metrics">Metrics
-Chapter</a> in the Accumulo User Manual.</p>
-
-<h2 id="distributed-tracing-with-htrace">Distributed Tracing with HTrace</h2>
-
-<p>HTrace has recently started gaining traction as a standalone project,
-especially with its adoption in HDFS. Accumulo has long had distributed
-tracing support via its own “Cloudtrace” library, but this wasn’t intended for
-use outside of Accumulo.</p>
-
-<p><a href="https://issues.apache.org/jira/browse/ACCUMULO-898">ACCUMULO-898</a> replaces Accumulo’s Cloudtrace code with HTrace.
-This has the benefit of adding timings (spans) from HDFS into Accumulo spans
-automatically.</p>
-
-<p>Users who inspect traces via the Accumulo Monitor (or another system) will begin
-to see timings from HDFS during operations like Major and Minor compactions when
-running with at least Apache Hadoop 2.6.0.</p>
-
-<h2 id="versions-file-present-in-binary-distribution">VERSIONS file present in binary distribution</h2>
-
-<p>In the pre-built binary distribution or distributions built by users from the
-official source release, users will now see a <code class="highlighter-rouge">VERSIONS</code> file present in the
-<code class="highlighter-rouge">lib/</code> directory alongside the Accumulo server-side jars. Because the created
-tarball strips off versions from the jar file names, it can require extra work
-to actually find what the version of each dependent jar (typically inspecting
-the jar’s manifest).</p>
-
-<p><a href="https://issues.apache.org/jira/browse/ACCUMULO-2863">ACCUMULO-2863</a> adds a <code class="highlighter-rouge">VERSIONS</code> file to the <code class="highlighter-rouge">lib/</code> directory
-which contains the Maven groupId, artifactId, and verison (GAV) information for
-each jar file included in the distribution.</p>
-
-<h2 id="per-table-volume-chooser">Per-Table Volume Chooser</h2>
-
-<p>The <code class="highlighter-rouge">VolumeChooser</code> interface is a server-side extension point that allows user
-tables to provide custom logic in choosing where its files are written when
-multiple HDFS instances are available. By default, a randomized volume chooser
-implementation is used to evenly balance files across all HDFS instances.</p>
-
-<p>Previously, this VolumeChooser logic was instance-wide which meant that it would
-affect all tables. This is potentially undesirable as it might unintentionally
-impact other users in a multi-tenant system. <a href="https://issues.apache.org/jira/browse/ACCUMULO-3177">ACCUMULO-3177</a>
-introduces a new per-table property which supports configuration of a
-<code class="highlighter-rouge">VolumeChooser</code>. This ensures that the implementation to choose how HDFS
-utilization happens when multiple are available is limited to the expected
-subset of all tables.</p>
-
-<h2 id="table-and-namespace-custom-properties">Table and namespace custom properties</h2>
-
-<p>In order to avoid errors caused by mis-typed configuration properties, Accumulo was strict about which configuration properties 
-could be set. However, this prevented users from setting arbitrary properties that could be used by custom balancers, compaction 
-strategies, volume choosers, and iterators. Under <a href="https://issues.apache.org/jira/browse/ACCUMULO-2841">ACCUMULO-2841</a>, the ability to set arbitrary table and 
-namespace properties was added. The properties need to be prefixed with <code class="highlighter-rouge">table.custom.</code>.  The changes made in 
-<a href="https://issues.apache.org/jira/browse/ACCUMULO-3177">ACCUMULO-3177</a> and <a href="https://issues.apache.org/jira/browse/ACCUMULO-3439">ACCUMULO-3439</a> leverage this new feature.</p>
-
-<h1 id="notable-bug-fixes">Notable Bug Fixes</h1>
-
-<h2 id="sourceswitchingiterator-deadlock">SourceSwitchingIterator Deadlock</h2>
-
-<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>
-
-<h2 id="table-flush-blocked-indefinitely">Table flush blocked indefinitely</h2>
-
-<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>
-
-<h1 id="testing">Testing</h1>
-
-<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 class="highlighter-rouge">general.rpc.timeout</code> in the
-Accumulo configuration from <code class="highlighter-rouge">120s</code> to <code class="highlighter-rouge">240s</code>.</p>
-
-<table id="release_notes_testing" class="table">
-  <thead>
-    <tr>
-      <th>OS</th>
-      <th>Hadoop</th>
-      <th>Nodes</th>
-      <th>ZooKeeper</th>
-      <th>HDFS HA</th>
-      <th>Tests</th>
-    </tr>
-  </thead>
-  <tbody>
-    <tr>
-      <td>Gentoo</td>
-      <td>N/A</td>
-      <td>1</td>
-      <td>N/A</td>
-      <td>No</td>
-      <td>Unit and Integration Tests</td>
-    </tr>
-    <tr>
-      <td>Gentoo</td>
-      <td>2.6.0</td>
-      <td>1 (2 TServers)</td>
-      <td>3.4.5</td>
-      <td>No</td>
-      <td>24hr CI w/ agitation and verification, 24hr RW w/o agitation.</td>
-    </tr>
-    <tr>
-      <td>Centos 6.6</td>
-      <td>2.6.0</td>
-      <td>3</td>
-      <td>3.4.6</td>
-      <td>No</td>
-      <td>24hr RW w/ agitation, 24hr CI w/o agitation, 72hr CI w/ and w/o agitation</td>
-    </tr>
-    <tr>
-      <td>Amazon Linux</td>
-      <td>2.6.0</td>
-      <td>20 m1large</td>
-      <td>3.4.6</td>
-      <td>No</td>
-      <td>24hr CI w/o agitation</td>
-    </tr>
-  </tbody>
-</table>
-
-
-        </div>
-
-        
-<footer>
-
-  <p><a href="https://www.apache.org"><img src="/images/feather-small.gif" alt="Apache Software Foundation" id="asf-logo" height="100" /></a></p>
-
-  <p>Copyright © 2011-2016 The Apache Software Foundation. Licensed under the <a href="https://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p>
-
-</footer>
-
-
-      </div>
-    </div>
-  </div>
-</body>
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-          <h1 class="title">Apache Accumulo 1.7.1 Release Notes</h1>
-          
-          <p>Apache Accumulo 1.7.1 is a maintenance release on the 1.7 version branch. This
-release contains changes from more than 150 issues, comprised of bug-fixes,
-performance improvements, build quality improvements, and more. See
-<a href="https://issues.apache.org/jira/browse/ACCUMULO/fixforversion/12329940">JIRA</a> for a complete list.</p>
-
-<p>Users of any previous 1.7.x release 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 1.6 or earlier that are seeking to
-upgrade to 1.7 should consider 1.7.1 as a starting point.</p>
-
-<h2 id="highlights">Highlights</h2>
-
-<h3 id="silent-data-loss-via-bulk-imported-files">Silent data-loss via bulk imported files</h3>
-
-<p>A user recently reported that a simple bulk-import application would
-occasionally lose some records. Through investigation, it was found that when
-bulk imports into a table failed the initial assignment, the logic that
-automatically retries the imports was incorrectly choosing the tablets to
-import the files into. <a href="https://issues.apache.org/jira/browse/ACCUMULO-3967">ACCUMULO-3967</a> contains more information
-on the cause and identification of the bug. The data-loss condition would only
-affect entire files. If records from a file exist in Accumulo, it is still
-guaranteed that all records within that imported file were successful.</p>
-
-<p>As such, users who have bulk import applications using previous versions of
-Accumulo should verify that all of their data was correctly ingested into
-Accumulo and immediately update to Accumulo 1.7.1 (This is the same bug that
-was fixed in 1.6.4, so you won’t be affected if you’re running 1.6.4 or newer).</p>
-
-<h3 id="queued-compactions-not-running">Queued Compactions Not Running</h3>
-
-<p>Found and fixed a bug (<a href="https://issues.apache.org/jira/browse/ACCUMULO-4016">ACCUMULO-4016</a>) in which some queued
-compactions would never run if the number of files changed while the tablet was
-queued.</p>
-
-<h3 id="kerberos-ticket-renewals">Kerberos Ticket Renewals</h3>
-
-<p>A bug was fixed which caused Accumulo clients and services to fail to check and
-(if necessary) renew their Kerberos credentials. This would eventually lead to
-these components failing to properly authenticate until they were restarted.
-(<a href="https://issues.apache.org/jira/browse/ACCUMULO-4069">ACCUMULO-4069</a>)</p>
-
-<h3 id="updated-commons-collection">Updated commons-collection</h3>
-
-<p>The bundled commons-collection library was updated from version 3.2.1 to 3.2.2
-because of a reported vulnerability in that library.
-(<a href="https://issues.apache.org/jira/browse/ACCUMULO-4056">ACCUMULO-4056</a>)</p>
-
-<h3 id="faster-processing-of-conditional-mutations">Faster Processing of Conditional Mutations</h3>
-
-<p>Improved ConditionalMutation processing time by a factor of 3.
-(<a href="https://issues.apache.org/jira/browse/ACCUMULO-4066">ACCUMULO-4066</a>)</p>
-
-<h3 id="slow-gc-while-bulk-importing">Slow GC While Bulk Importing</h3>
-
-<p>Found and worked around an issue where lots of bulk imports creating many new
-files would significantly impair the Accumulo GC service, and possibly prevent
-it from running to completion entirely. (<a href="https://issues.apache.org/jira/browse/ACCUMULO-4021">ACCUMULO-4021</a>)</p>
-
-<h3 id="unnoticed-per-table-configuration-updates">Unnoticed Per-table Configuration Updates</h3>
-
-<p>Fixed a bug which caused tablet servers to not notice changes to the per-table
-constraints, under some circumstances. (<a href="https://issues.apache.org/jira/browse/ACCUMULO-3859">ACCUMULO-3859</a>)</p>
-
-<h3 id="tabletservers-kill-themselves-on-centos7">TabletServers kill themselves on CentOS7</h3>
-
-<p>Reduced the aggressiveness with which Accumulo Tablet Servers preemptively
-killed themselves when a local filesystem switched to read-only (indicating a
-possible failure). To reduce false positives, such as those which can occur
-with systemd’s extra cgroup mounts in CentOS7, an additional check was added to
-ensure that tablet servers would only kill themselves if an ext- or
-xfs-formatted disk switched to read-only. (<a href="https://issues.apache.org/jira/browse/ACCUMULO-4080">ACCUMULO-4080</a>)</p>
-
-<h3 id="improvements-in-locating-client-configuration-file">Improvements in Locating Client Configuration File</h3>
-
-<p>Fixed some unexpected error messages related to setting
-ACCUMULO_CLIENT_CONF_PATH, and improved the detection of the client.conf file if
-ACCUMULO_CLIENT_CONF_PATH was set to a directory containing client.conf.
-(<a href="https://issues.apache.org/jira/browse/ACCUMULO-4026">ACCUMULO-4026</a>,<a href="https://issues.apache.org/jira/browse/ACCUMULO-4027">ACCUMULO-4027</a>)</p>
-
-<h3 id="transient-zookeeper-disconnect-causes-fate-threads-to-exit">Transient ZooKeeper disconnect causes FATE threads to exit</h3>
-
-<p>ZooKeeper clients are expected to handle the situation where they become
-disconnected from the ZooKeeper server and must wait to be reconnected
-before continuing ZooKeeper operations.</p>
-
-<p>The dedicated threads running inside the Accumulo Master process for FATE
-actions had the potential unexpectedly exit in this disconnected state.
-This caused a scenario where all future FATE-based operations would
-be blocked until the Accumulo Master process was restarted. (<a href="https://issues.apache.org/jira/browse/ACCUMULO-4060">ACCUMULO-4060</a>)</p>
-
-<h3 id="incorrect-management-of-certain-apache-thrift-rpcs">Incorrect management of certain Apache Thrift RPCs</h3>
-
-<p>Accumulo relies on Apache Thrift to implement remote procedure calls between
-Accumulo services. Accumulo’s use of Thrift uncovered an unfortunate situation
-where a special RPC (a “oneway” call) would leave unwanted data on the underlying
-Thrift connection. After this extra data was left on connection, all subsequent RPCs
-re-using that connection would fail with “out of sequence response” error messages.
-Accumulo would be left in a bad state until the mishandled connections were released
-or Accumulo services were restarted. (<a href="https://issues.apache.org/jira/browse/ACCUMULO-4065">ACCUMULO-4065</a>)</p>
-
-<h2 id="other-notable-changes">Other Notable Changes</h2>
-
-<ul>
-  <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3509">ACCUMULO-3509</a> Fixed some lock contention in TabletServer, preventing resource cleanup</li>
-  <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3734">ACCUMULO-3734</a> Fixed quote-escaping bug in VisibilityConstraint</li>
-  <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-4025">ACCUMULO-4025</a> Fixed cleanup of bulk load fate transactions</li>
-  <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-4098">ACCUMULO-4098</a>,<a href="https://issues.apache.org/jira/browse/ACCUMULO-4113">ACCUMULO-4113</a> Fixed widespread misuse of ByteBuffer</li>
-</ul>
-
-<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.</p>
-
-<table id="release_notes_testing" class="table">
-  <thead>
-    <tr>
-      <th>OS/Environment</th>
-      <th>Hadoop</th>
-      <th>Nodes</th>
-      <th>ZooKeeper</th>
-      <th>HDFS HA</th>
-      <th>Tests</th>
-    </tr>
-  </thead>
-  <tbody>
-    <tr>
-      <td>CentOS 7.1 w/Oracle JDK8 on EC2 (1 m3.xlarge, 8 d2.xlarge)</td>
-      <td>2.6.3</td>
-      <td>9</td>
-      <td>3.4.6</td>
-      <td>No</td>
-      <td>Random walk (All.xml) 24-hour run, saw <a href="https://issues.apache.org/jira/browse/ACCUMULO-3794">ACCUMULO-3794</a> and <a href="https://issues.apache.org/jira/browse/ACCUMULO-4151">ACCUMULO-4151</a>.</td>
-    </tr>
-    <tr>
-      <td>CentOS 7.1 w/Oracle JDK8 on EC2 (1 m3.xlarge, 8 d2.xlarge)</td>
-      <td>2.6.3</td>
-      <td>9</td>
-      <td>3.4.6</td>
-      <td>No</td>
-      <td>21 hr run of CI w/ agitation, 23.1B entries verified.</td>
-    </tr>
-    <tr>
-      <td>CentOS 7.1 w/Oracle JDK8 on EC2 (1 m3.xlarge, 8 d2.xlarge)</td>
-      <td>2.6.3</td>
-      <td>9</td>
-      <td>3.4.6</td>
-      <td>No</td>
-      <td>24 hr run of CI w/o agitation, 23.0B entries verified; saw performance issues outlined in comment on <a href="https://issues.apache.org/jira/browse/ACCUMULO-4146">ACCUMULO-4146</a>.</td>
-    </tr>
-    <tr>
-      <td>CentOS 6.7 (OpenJDK 7), Fedora 23 (OpenJDK 8), and CentOS 7.2 (OpenJDK 7)</td>
-      <td>2.6.1</td>
-      <td>1</td>
-      <td>3.4.6</td>
-      <td>No</td>
-      <td>All unit tests and ITs pass with -Dhadoop.version=2.6.1; Kerberos ITs had a problem with earlier versions of Hadoop</td>
-    </tr>
-  </tbody>
-</table>
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