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Posted to commits@accumulo.apache.org by bu...@apache.org on 2014/09/26 21:12:27 UTC
svn commit: r923733 - in /websites/staging/accumulo/trunk/content: ./
release_notes/1.6.1.html
Author: buildbot
Date: Fri Sep 26 19:12:27 2014
New Revision: 923733
Log:
Staging update by buildbot for accumulo
Added:
websites/staging/accumulo/trunk/content/release_notes/1.6.1.html
Modified:
websites/staging/accumulo/trunk/content/ (props changed)
Propchange: websites/staging/accumulo/trunk/content/
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--- websites/staging/accumulo/trunk/content/release_notes/1.6.1.html (added)
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+
+ <h1 class="title">Apache Accumulo 1.5.2 Release Notes</h1>
+
+ <p>Apache Accumulo 1.5.2 is a maintenance release on the 1.5 version branch.
+This release contains changes from over 100 issues, comprised of bug fixes
+(client side and server side), new test cases, and updated Hadoop support
+contributed by over 30 different contributors and committers.
+As this is a maintenance release, Apache Accumulo 1.5.2 has no client API
+incompatibilities over Apache Accumulo 1.5.0 and 1.5.1 and requires no manual upgrade
+process. Users of 1.5.0 or 1.5.1 are strongly encouraged to update as soon as possible
+to benefit from the improvements.</p>
+<p>Users who are new to Accumulo are encouraged to use a 1.6 release as opposed
+to the 1.5 line as development has already shifted towards the 1.6 line. For those
+who cannot or do not want to upgrade to 1.6, 1.5.2 is still an excellent choice
+over earlier versions in the 1.5 line.</p>
+<h2 id="performance-improvements">Performance Improvements</h2>
+<p>Apache Accumulo 1.5.2 includes a number of performance-related fixes over previous versions.</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 Accumulo.
+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="https://issues.apache.org/jira/browse/ACCUMULO-2766">ACCUMULO-2766</a> fixed
+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 which
+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="https://issues.apache.org/jira/browse/ACCUMULO-2905">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 programming
+construct, but are also used internally for numerous server operations. One of these system iterator
+is the HeapIterator which implements a PriorityQueue of other Iterators. One way this iterator is
+used is to merge multiple files in HDFS to present a single, sorted stream of Key-Value pairs. <a href="https://issues.apache.org/jira/browse/ACCUMULO-2827">ACCUMULO-2827</a>
+introduces a performance optimization to the HeapIterator which can improve the speed of the
+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 these
+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="https://issues.apache.org/jira/browse/ACCUMULO-2842">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>
+<h3 id="server-side-mutation-queue-size">Server-side mutation queue size</h3>
+<p>When users desire writes to be as durable as possible, using <em>hsync</em>, the ingest performance
+of the system can be improved by increasing the tserver.mutation.queue.max property. The cost
+of this change is that it will cause TabletServers to use additional memory per writer. In 1.5.1,
+the value of this parameter defaulted to a conservative 256K, which resulted in sub-par ingest
+performance.</p>
+<p>1.5.2 and <a href="https://issues.apache.org/jira/browse/ACCUMULO-3018">ACCUMULO-3018</a> increases this buffer to 1M which has a noticeable positive impact on
+ingest performance with a minimal increase in TabletServer memory usage.</p>
+<h2 id="notable-bug-fixes">Notable Bug Fixes</h2>
+<h3 id="fixes-mapreduce-package-name-change">Fixes MapReduce package name change</h3>
+<p>1.5.1 inadvertently included a change to RangeInputSplit which created an incompatibility
+with 1.5.0. The original class has been restored to ensure that users accessing
+the RangeInputSplit class do not have to alter their client code. See <a href="https://issues.apache.org/jira/browse/ACCUMULO-2586">ACCUMULO-2586</a> for
+more information</p>
+<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="https://issues.apache.org/jira/browse/ACCUMULO-2658">ACCUMULO-2658</a> introduces a configuration
+parameter, like <a href="https://issues.apache.org/jira/browse/ACCUMULO-2360">ACCUMULO-2360</a>, to prevent this error.</p>
+<h3 id="offline-tables-can-prevent-tablet-balancing">Offline tables can prevent tablet balancing</h3>
+<p>Before 1.5.2, 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="https://issues.apache.org/jira/browse/ACCUMULO-2694">ACCUMULO-2694</a> introduces a fix to ensure
+that offline tables do not block balancing and improves the server-side
+logging.</p>
+<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="https://issues.apache.org/jira/browse/ACCUMULO-2764">ACCUMULO-2764</a>, <a href="https://issues.apache.org/jira/browse/ACCUMULO-2985">ACCUMULO-2985</a>, and <a href="https://issues.apache.org/jira/browse/ACCUMULO-3055">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="https://issues.apache.org/jira/browse/ACCUMULO-2962">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="https://issues.apache.org/jira/browse/ACCUMULO-3096">ACCUMULO-3096</a> fixes the issue so that the
+constraint no longer hangs the entire system.</p>
+<h2 id="documentation">Documentation</h2>
+<p>The following documentation updates were made: </p>
+<ul>
+<li><a href="https://issues.apache.org/jira/browse/ACCUMULO-2540">ACCUMULO-2540</a></li>
+<li><a href="https://issues.apache.org/jira/browse/ACCUMULO-2767">ACCUMULO-2767</a></li>
+<li><a href="https://issues.apache.org/jira/browse/ACCUMULO-2796">ACCUMULO-2796</a></li>
+<li><a href="https://issues.apache.org/jira/browse/ACCUMULO-2443">ACCUMULO-2443</a></li>
+<li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3008">ACCUMULO-3008</a></li>
+<li><a href="https://issues.apache.org/jira/browse/ACCUMULO-2919">ACCUMULO-2919</a></li>
+<li><a href="https://issues.apache.org/jira/browse/ACCUMULO-2874">ACCUMULO-2874</a></li>
+<li><a href="https://issues.apache.org/jira/browse/ACCUMULO-2653">ACCUMULO-2653</a></li>
+<li><a href="https://issues.apache.org/jira/browse/ACCUMULO-2437">ACCUMULO-2437</a></li>
+<li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3097">ACCUMULO-3097</a></li>
+<li><a href="https://issues.apache.org/jira/browse/ACCUMULO-2499">ACCUMULO-2499</a></li>
+<li><a href="https://issues.apache.org/jira/browse/ACCUMULO-1669">ACCUMULO-1669</a></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.
+<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>1</td>
+ <td>Apache 3.4.5</td>
+ <td>No</td>
+ <td>Unit and Functional Tests, ContinuousIngest w/ verification (1B 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, 24/hr ContinuousIngest w/ verification w/ and w/o agitation (30B and 23B entries)</td>
+ </tr>
+</table></p>
+ </div>
+
+ <div id="footer">
+ <a alt="Apache Software Foundation" href="http://www.apache.org">
+ <img id="asf-logo" alt="Apache Software Foundation" src="/images/feather-small.gif" width="100">
+ </a>
+ <div class="copyright">
+ <p>
+ Copyright © 2011-2014 The Apache Software Foundation, Licensed under
+ the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.
+ Apache Accumulo, Accumulo, Apache, the Apache feather logo, and the Apache Accumulo
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