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Posted to commits@accumulo.apache.org by mw...@apache.org on 2016/11/10 21:38:28 UTC
[22/36] accumulo git commit: Jekyll build from gh-pages:358b7b4
http://git-wip-us.apache.org/repos/asf/accumulo/blob/c0655661/release/accumulo-1.6.3/index.html
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+ </div>
+ <div id="content">
+
+ <h1 class="title">Apache Accumulo 1.6.3</h1>
+
+ <p>04 Jul 2015</p>
+
+<p>Apache Accumulo 1.6.3 is a maintenance release on the 1.6 version branch.
+This release contains changes from over 63 issues, comprised of bug-fixes,
+performance improvements and better test cases. See <a href="https://issues.apache.org/jira/browse/ACCUMULO/fixforversion/12329154">JIRA</a> for a
+complete list.</p>
+
+<p>Users of 1.6.0, 1.6.1, and 1.6.2 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 1.6.3 as a starting point. For information about
+improvements since Accumulo 1.5, see the <a href="/release_notes/1.6.0">1.6.0</a>, <a href="/release_notes/1.6.1">1.6.1</a>, and
+<a href="/release_notes/1.6.2">1.6.2</a> release notes.</p>
+
+<h2 id="fixed-batchwriter-hold-time-error">Fixed BatchWriter hold time error</h2>
+
+<p>In previous releases, a <code class="highlighter-rouge">BatchWriter</code> could fail with a
+<code class="highlighter-rouge">MutationsRejectedException</code> with server errors. If inspection of the tserver
+logs showed <code class="highlighter-rouge">HoldTimeoutException</code> was the cause, the workaround was to
+increase the value of <code class="highlighter-rouge">general.rpc.timeout</code>. Changing this setting is no
+longer necessary as this bug was fixed by <a href="https://issues.apache.org/jira/browse/ACCUMULO-2388">ACCUMULO-2388</a>.</p>
+
+<h2 id="severe-bug-fixes">Severe bug fixes</h2>
+
+<ul>
+ <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3597">ACCUMULO-3597</a> Fixed a deadlock where a table flush and
+metadata tablet load were waiting on each other. This was a rare bug. If it
+occurred it could impact the availability of Accumulo as most Accumulo
+operations depend on metadata tablets.</li>
+ <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3709">ACCUMULO-3709</a> Fixed a potential data loss bug where
+AccumuloOutputFormat close did not rethrow exception.</li>
+ <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3745">ACCUMULO-3745</a> Fixed a deadlock in SourceSwitchingIterator
+that occurred when using custom iterators that called <code class="highlighter-rouge">deepCopy</code>. This bug
+would cause scans to hang indefinitely until the offending tserver was killed.</li>
+ <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3859">ACCUMULO-3859</a> Fixed a race condition that could prevent table
+constraints from ever loading for a Tablet. It is likely to only affect users
+when the constraint is first added to a table.</li>
+</ul>
+
+<h2 id="notable-bug-fixes">Notable bug fixes</h2>
+
+<ul>
+ <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3589">ACCUMULO-3589</a> <code class="highlighter-rouge">du</code> in Shell does not check table existence.</li>
+ <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3692">ACCUMULO-3692</a> Offline\u2019ing a table disabled subsequent balancing.</li>
+ <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3696">ACCUMULO-3696</a> Tracing could queue too many traces</li>
+ <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3718">ACCUMULO-3718</a> Fixed a bug that prevented a Mutation from
+being created in Scala.</li>
+ <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3747">ACCUMULO-3747</a> Thrashing tablet servers would be removed from the Monitor\u2019s Dead Server list.</li>
+ <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3750">ACCUMULO-3750</a> Fixed an issue where the Master would perpetually
+fail when there was a bad <code class="highlighter-rouge">instance.secret</code> setting.</li>
+ <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3784">ACCUMULO-3784</a> Fixed a bug in <code class="highlighter-rouge">getauths</code> Shell command where it
+treated visibilities that differed only in case as the same.</li>
+ <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3796">ACCUMULO-3796</a> Added documentation about turning off zone
+reclaim.</li>
+ <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3880">ACCUMULO-3880</a> Fixed an issue where malformed configuration caused
+TabletServers to shutdown.</li>
+ <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3890">ACCUMULO-3890</a> Fixed a performance issue with CredentialProvider. Information
+stored in the CredentialProvider was not cached which resulted in repeatedly reading the
+file from HDFS which can degrade HDFS performance.</li>
+</ul>
+
+<h2 id="known-issues">Known Issues</h2>
+
+<p>During testing <a href="https://issues.apache.org/jira/browse/HDFS-8406">HDFS-8406</a> was encountered which is summarized by write-ahead log recovery
+that was never completed due to an inability to recover the HDFS lease on the WAL. To work around
+this issue, the following steps can be done:</p>
+
+<ol>
+ <li>Locate block for walog whose lease can not be recovered.</li>
+ <li>Copy block into HDFS as temp file TMP_WALOG</li>
+ <li>Delete the walog whose lease can not be recovered.</li>
+ <li>Move TMP_WALOG to the filename of the walog deleted in the previous step.</li>
+</ol>
+
+<p>Using the <code class="highlighter-rouge">fetchColumns()</code> method on a scanner in conjunction with custom iterators that
+add column families in their <code class="highlighter-rouge">seek()</code> method can lead to unexpected behavior. See
+<a href="https://issues.apache.org/jira/browse/ACCUMULO-3905">ACCUMULO-3905</a> for more details. In that issue javadoc updates were made,
+but the updates did not make it into 1.6.3.</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.</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>Amazon Linux 2014.09</td>
+ <td>2.6.0</td>
+ <td>20</td>
+ <td>3.4.5</td>
+ <td>No</td>
+ <td>24hr ContinuousIngest w/ verification w/ and w/o agitation</td>
+ </tr>
+ <tr>
+ <td>Amazon Linux 2014.09</td>
+ <td>2.6.0</td>
+ <td>20</td>
+ <td>3.4.5</td>
+ <td>No</td>
+ <td>24hr Randomwalk w/o agitation</td>
+ </tr>
+ <tr>
+ <td>Centos 6.5</td>
+ <td>2.7.1</td>
+ <td>6</td>
+ <td>3.4.5</td>
+ <td>No</td>
+ <td>Continuous Ingest and Verify (6B entries)</td>
+ </tr>
+ <tr>
+ <td>Centos 6.6</td>
+ <td>2.2.0</td>
+ <td>6</td>
+ <td>3.4.5</td>
+ <td>No</td>
+ <td>All integration test passed. Some needed to be run a 2nd time.</td>
+ </tr>
+ </tbody>
+</table>
+
+
+
+<p><strong>View all releases in the <a href="/release/">archive</a></strong></p>
+
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+
+
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+
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+
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+
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+
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+</html>
http://git-wip-us.apache.org/repos/asf/accumulo/blob/c0655661/release/accumulo-1.6.4/index.html
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diff --git a/release/accumulo-1.6.4/index.html b/release/accumulo-1.6.4/index.html
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+ this work for additional information regarding copyright ownership.
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+ (the "License"); you may not use this file except in compliance with
+ the License. You may obtain a copy of the License at
+
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+
+ Unless required by applicable law or agreed to in writing, software
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+
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+
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+
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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 1.6.4</h1>
+
+ <p>03 Oct 2015</p>
+
+<p>Apache Accumulo 1.6.4 is a maintenance release on the 1.6 version branch.
+This release contains changes from 21 issues, comprised of bug-fixes,
+performance improvements and better test cases. See <a href="https://issues.apache.org/jira/browse/ACCUMULO/fixforversion/12332840">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 1.6.4 as a starting point.</p>
+
+<h2 id="silent-data-loss-via-bulk-imported-files">Silent data-loss via bulk imported files</h2>
+
+<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 1.6.4.</p>
+
+<h2 id="other-bug-fixes">Other bug fixes</h2>
+
+<ul>
+ <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3979">ACCUMULO-3979</a> Fixed an issue where the BulkImporter failed
+with an error message \u201cQUERY_METADATA already started\u201d.</li>
+ <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3965">ACCUMULO-3965</a> The <code class="highlighter-rouge">listscans</code> shell command did not contain
+the <code class="highlighter-rouge">scanId</code> attribute for currently running scans.</li>
+ <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3946">ACCUMULO-3946</a> Verified that all user-facing operations contained
+appropriate audit messages.</li>
+ <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3977">ACCUMULO-3977</a> Isolated scans with Iterators in use incorrectly
+fail around invocation of <code class="highlighter-rouge">deepCopy</code>.</li>
+ <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3905">ACCUMULO-3905</a> RowDeletingIterator functions incorrectly when
+columns are provided by the client. This restores intended functionality without
+the need for a <a href="https://issues.apache.org/jira/browse/ACCUMULO-1801?focusedCommentId=13970204&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13970204">workaround</a>.</li>
+ <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3959">ACCUMULO-3959</a> <a href="https://issues.apache.org/jira/browse/ACCUMULO-3934">ACCUMULO-3934</a> Multiple documentation
+improvements to <code class="highlighter-rouge">BatchScanner</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</th>
+ <th>Hadoop</th>
+ <th>Nodes</th>
+ <th>ZooKeeper</th>
+ <th>HDFS HA</th>
+ <th>Tests</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr>
+ <td>Amazon Linux 2014.09</td>
+ <td>2.6.0</td>
+ <td>20</td>
+ <td>3.4.5</td>
+ <td>No</td>
+ <td>ContinuousIngest w/ verification w/ and w/o agitation (37B entries)</td>
+ </tr>
+ </tbody>
+</table>
+
+
+
+<p><strong>View all releases in the <a href="/release/">archive</a></strong></p>
+
+ </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>
+
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+
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+</html>
http://git-wip-us.apache.org/repos/asf/accumulo/blob/c0655661/release/accumulo-1.6.5/index.html
----------------------------------------------------------------------
diff --git a/release/accumulo-1.6.5/index.html b/release/accumulo-1.6.5/index.html
new file mode 100644
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--- /dev/null
+++ b/release/accumulo-1.6.5/index.html
@@ -0,0 +1,321 @@
+<!DOCTYPE html>
+<html lang="en">
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+
+ <div id="non-canonical" style="display: none; background-color: #F0E68C; padding-left: 1em;">
+ 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</h1>
+
+ <p>17 Feb 2016</p>
+
+<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\u2019s use of Thrift uncovered an unfortunate situation
+where a special RPC (a \u201coneway\u201d 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 \u201cout of sequence response\u201d 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>
+
+
+
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http://git-wip-us.apache.org/repos/asf/accumulo/blob/c0655661/release/accumulo-1.6.6/index.html
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+ <div id="content">
+
+ <h1 class="title">Apache Accumulo 1.6.6</h1>
+
+ <p>18 Sep 2016</p>
+
+<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&version=12334846">JIRA</a> for a complete list.</p>
+
+<p>Below are resources for this release:</p>
+
+<ul>
+ <li><a href="/1.6/accumulo_user_manual.html">User Manual</a></li>
+ <li><a href="/1.6/apidocs">Javadocs</a></li>
+ <li><a href="/1.6/examples">Examples</a></li>
+</ul>
+
+<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\u2019s 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\u2019s 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\u2019ve 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>
+
+<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>
+ <th>HDFS HA</th>
+ <th>Tests</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr>
+ <td>CentOS 7</td>
+ <td>1.2.1</td>
+ <td>1</td>
+ <td>3.3.6</td>
+ <td>No</td>
+ <td>Unit tests and Integration Tests</td>
+ </tr>
+ <tr>
+ <td>CentOS 7</td>
+ <td>2.2.0</td>
+ <td>1</td>
+ <td>3.3.6</td>
+ <td>No</td>
+ <td>Unit tests and Integration Tests</td>
+ </tr>
+ </tbody>
+</table>
+
+
+
+<p><strong>View all releases in the <a href="/release/">archive</a></strong></p>
+
+ </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>
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+</html>