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Subject svn commit: r940388 - in /websites/staging/accumulo/trunk/content: ./ release_notes/1.6.2.html
Date Mon, 16 Feb 2015 19:45:27 GMT
Author: buildbot
Date: Mon Feb 16 19:45:27 2015
New Revision: 940388

Staging update by buildbot for accumulo

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

Propchange: websites/staging/accumulo/trunk/content/
--- cms:source-revision (original)
+++ cms:source-revision Mon Feb 16 19:45:27 2015
@@ -1 +1 @@

Added: websites/staging/accumulo/trunk/content/release_notes/1.6.2.html
--- websites/staging/accumulo/trunk/content/release_notes/1.6.2.html (added)
+++ websites/staging/accumulo/trunk/content/release_notes/1.6.2.html Mon Feb 16 19:45:27 2015
@@ -0,0 +1,359 @@
+<!DOCTYPE html>
+<html lang="en">
+    Licensed to the Apache Software Foundation (ASF) under one or more
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+    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
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+ 2.0
+    Unless required by applicable law or agreed to in writing, software
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+<form method="GET" action="" class="navbar-form navbar-right"
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Summit" class="img-responsive" src="/images/accumulo-summit-2014.png"></a>
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+  <div id="bannertext">
+    <img id="logo" alt="Apache Accumulo &trade;" src="/images/accumulo-logo.png"/>
+  </div>
+  <div id="content">
+    <h1 class="title">Apache Accumulo 1.6.1 Release Notes</h1>
+    <p>Apache Accumulo 1.6.1 is a maintenance release on the 1.6 version branch.
+This release contains changes from over 175 issues, comprised of bug-fixes, performance
+improvements and better test cases. As this is a maintenance release, Apache Accumulo
+1.6.1 has no client API  incompatibilities over Apache Accumulo 1.6.0. Users of 1.6.0
+are strongly encouraged to update as soon as possible to benefit from the improvements.</p>
+<p>New users are encouraged to use this release over 1.6.0 or any other older releases.
+information about improvements since Accumulo 1.5, see the <a href="/release_notes/1.6.0.html">1.6.0
release notes</a>.</p>
+<h2 id="performance-improvements">Performance Improvements</h2>
+<p>Apache Accumulo 1.6.1 includes a number of performance-related fixes over previous
+Many of these improvements were also included in the recently released Apache Accumulo 1.5.2.</p>
+<h3 id="write-ahead-log-sync-performance">Write-Ahead Log sync performance</h3>
+<p>The Write-Ahead Log (WAL) files are used to ensure durability of updates made to
+A sync is called on the file in HDFS to make sure that the changes to the WAL are persisted
+to disk, which allows Accumulo to recover in the case of failure. <a href="">ACCUMULO-2766</a>
+an issue where an operation against a WAL would unnecessarily wait for multiple syncs, slowing
+down the ingest on the system.</p>
+<h3 id="minor-compactions-not-aggressive-enough">Minor-Compactions not aggressive enough</h3>
+<p>On a system with ample memory provided to Accumulo, long hold-times were observed
+blocks the ingest of new updates. Trying to free more server-side memory by running minor
+compactions more frequently increased the overall throughput on the node. These changes
+were made in <a href="">ACCUMULO-2905</a>.</p>
+<h3 id="heapiterator-optimization">HeapIterator optimization</h3>
+<p>Iterators, a notable feature of Accumulo, are provided to users as a server-side
+construct, but are also used internally for numerous server operations. One of these system
+is the HeapIterator which implements a PriorityQueue of other Iterators. One way this iterator
+used is to merge multiple files in HDFS to present a single, sorted stream of Key-Value pairs.
<a href="">ACCUMULO-2827</a>
+introduces a performance optimization to the HeapIterator which can improve the speed of
+HeapIterator in common cases.</p>
+<h3 id="write-ahead-log-sync-implementation">Write-Ahead log sync implementation</h3>
+<p>In Hadoop-2, two implementations of sync are provided: hflush and hsync. Both of
+methods provide a way to request that the datanodes write the data to the underlying
+medium and not just hold it in memory (the <em>fsync</em> syscall). While both
of these methods
+inform the Datanodes to sync the relevant block(s), <em>hflush</em> does not
wait for acknowledgement
+from the Datanodes that the sync finished, where <em>hsync</em> does. To provide
the most reliable system
+"out of the box", Accumulo defaults to <em>hsync</em> so that your data is as
secure as possible in 
+a variety of situations (notably, unexpected power outages).</p>
+<p>The downside is that performance tends to suffer because waiting for a sync to disk
is a very
+expensive operation. <a href="">ACCUMULO-2842</a>
introduces a new system property, tserver.wal.sync.method,
+that lets users to change the HDFS sync implementation from <em>hsync</em> to
<em>hflush</em>. Using <em>hflush</em> instead
+of <em>hsync</em> may result in about a 30% increase in ingest performance.</p>
+<p>For users upgrading from Hadoop-1 or Hadoop-0.20 releases, <em>hflush</em>
is the equivalent of how
+sync was implemented in these older versions of Hadoop and should give comparable performance.</p>
+<h2 id="other-improvements">Other improvements</h2>
+<h3 id="use-of-hadoop-credentialproviders">Use of Hadoop CredentialProviders</h3>
+<p>Apache Hadoop 2.6.0 introduced a new API aimed at providing ways to separate sensitive
+from being stored in plaintext as a part of <a href="">HADOOP-10607</a>.
Accumulo has had two sensitive
+configuration properties stored in <em>accumulo-site.xml</em> for every standard
installation: instance.secret
+and If either of these properties are compromised, it could
lead to
+unwanted access of Accumulo. <a href="">ACCUMULO-2464</a>
modifies Accumulo so that it can stored any sensitive
+configuration properties in a Hadoop CredentialProvider. With sensitive values removed from
+it can be shared without concern and security can be focused solely on the CredentialProvider.</p>
+<h2 id="notable-bug-fixes">Notable Bug Fixes</h2>
+<h3 id="add-configurable-maximum-frame-size-to-thrift-proxy">Add configurable maximum
frame size to Thrift proxy</h3>
+<p>The Thrift proxy server was subject to memory exhaustion, typically
+due to bad input, where the server would attempt to allocate a very large
+buffer and die in the process. <a href="">ACCUMULO-2658</a>
introduces a configuration
+parameter, like <a href="">ACCUMULO-2360</a>,
to prevent this error.</p>
+<h3 id="offline-tables-can-prevent-tablet-balancing">Offline tables can prevent tablet
+<p>Before 1.6.1, when a table with many tablets was created, ingested into, and
+taken offline, tablet balancing may have stoppped. This would happen if there
+were tablet migrations for the table, because the migrations couldn't occur.
+The balancer will not run when there are outstanding migrations; therefore, a
+system could become unbalanced. <a href="">ACCUMULO-2694</a>
introduces a fix to ensure
+that offline tables do not block balancing and improves the server-side
+<h3 id="miniaccumulocluster-process-management">MiniAccumuloCluster process management</h3>
+<p>MiniAccumuloCluster had a few issues which could cause deadlock or a method that
+never returns. Most of these are related to management of the Accumulo processes
+(<a href="">ACCUMULO-2764</a>,
<a href="">ACCUMULO-2985</a>,
and <a href="">ACCUMULO-3055</a>).</p>
+<h3 id="iteratorsettings-not-correctly-serialized-in-rangeinputsplit">IteratorSettings
not correctly serialized in RangeInputSplit</h3>
+<p>The Writable interface methods on the RangeInputSplit class accidentally omitted
+calls to serialize the IteratorSettings configured for the Job. <a href="">ACCUMULO-2962</a>
+fixes the serialization and adds some additional tests.</p>
+<h3 id="constraint-violation-causes-hung-scans">Constraint violation causes hung scans</h3>
+<p>A failed bulk import transaction had the ability to create an infinitely retrying
+loop due to a constraint violation. This directly prevents scans from completing,
+but will also hang compactions. <a href="">ACCUMULO-3096</a>
fixes the issue so that the
+constraint no longer hangs the entire system.</p>
+<h3 id="unable-to-upgrade-cleanly-from-15">Unable to upgrade cleanly from 1.5</h3>
+<p>When upgrading a table from 1.5.1 to 1.6.0, a user experienced an error where the
+never came online. <a href="">ACCUMULO-2974</a>
fixes an issue from the change of file references
+stored as absolute paths instead of relative paths in the Accumulo metadata table.</p>
+<h3 id="guava-dependency-changed">Guava dependency changed</h3>
+<p><a href="">ACCUMULO-3100</a>
lowered the dependency on Guava from 15.0 to 14.0.1. This dependency
+now matches what Hadoop is depending on for the 2.x.y version line. Depending on a newer
+version of Guava introduces many issues stemming from deprecated classes in use by Hadoop
+which have been removed. While installations of Accumulo will likely work as expected with
+newer versions of Guava on the classpath (because the Hadoop processes will have their own
+classpath), use of MiniDfsClusters with the new Guava version will result in errors.</p>
+<p>Users can attempt to use a newer version of Guava on the Accumulo server classpath;
+the success is dependent on Hadoop client libraries not using (missing) Guava methods internally.</p>
+<h3 id="scanners-eat-interruptedexception">Scanners eat InterruptedException</h3>
+<p>Scanners previously consumed InterruptedExceptions and did not exit after. In multi-threaded
+environments, this is very problematic as there is no means to stop the Scanner from reading
+<a href="">ACCUMULO-3030</a>
fixes the Scanner so that interrupts are observed and the Scanner exits as expected.</p>
+<h2 id="documentation">Documentation</h2>
+<p>The following documentation updates were made: </p>
+<li><a href="">ACCUMULO-2767</a></li>
+<li><a href="">ACCUMULO-2796</a></li>
+<li><a href="">ACCUMULO-2919</a></li>
+<li><a href="">ACCUMULO-3008</a></li>
+<li><a href="">ACCUMULO-2874</a></li>
+<li><a href="">ACCUMULO-2821</a></li>
+<li><a href="">ACCUMULO-3097</a></li>
+<li><a href="">ACCUMULO-3097</a></li>
+<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>Apache 2.6.0-SNAPSHOT</td>
+    <td>2</td>
+    <td>Apache 3.4.5</td>
+    <td>No</td>
+    <td>Unit and Functional Tests, ContinuousIngest w/ verification (2B entries)</td>
+  </tr>
+  <tr>
+    <td>CentOS 6</td>
+    <td>Apache 2.3.0</td>
+    <td>20</td>
+    <td>Apache 3.4.5</td>
+    <td>No</td>
+    <td>24/hr RandomWalk, ContinuousIngest w/ verification w/ and w/o agitation (17B
entries), 24hr Randomwalk test</td>
+  </tr>
+  </div>
+  <div id="footer">
+    <a alt="Apache Software Foundation" href="">
+      <img id="asf-logo" alt="Apache Software Foundation" src="/images/feather-small.gif"
+    </a>
+    <div class="copyright">
+      <p>
+        Copyright &copy; 2011-2014 The Apache Software Foundation, Licensed under
+        the <a href="">Apache License, Version
+        Apache Accumulo, Accumulo, Apache, the Apache feather logo, and the Apache Accumulo
+        project logo are trademarks of the <a href="">Apache Software
Foundation</a>.<br />
+        Site created with <a href="">Bootstrap</a> including
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