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From ctubb...@apache.org
Subject [18/50] [abbrv] accumulo-website git commit: Jekyll build from gh-pages:358b7b4
Date Tue, 22 Nov 2016 19:41:15 GMT
http://git-wip-us.apache.org/repos/asf/accumulo-website/blob/c0655661/release/accumulo-1.5.1/index.html
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+<!DOCTYPE html>
+<html lang="en">
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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 1.5.1</h1>
+          
+          <p>06 Mar 2014</p>
+
+<p>Apache Accumulo 1.5.1 is a maintenance release on the 1.5 version branch.
+This release contains changes from over 200 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 1.5.1 has no client API 
+incompatibilities over Apache Accumulo 1.5.0 and requires no manual upgrade 
+process. Users of 1.5.0 are strongly encouraged to update as soon as possible 
+to benefit from the improvements.</p>
+
+<h2 id="notable-improvements">Notable Improvements</h2>
+
+<p>While new features are typically not added in a bug-fix release as 1.5.1, the
+community does create a variety of improvements that are API compatible. Contained
+here are some of the more notable improvements.</p>
+
+<h3 id="permgen-leak-from-client-api">PermGen Leak from Client API</h3>
+
+<p>Accumulo’s client code creates background threads that users presently cannot 
+stop through the API. This is quick to cause problems when invoking the Accumulo
+API in application containers such as Apache Tomcat or JBoss and repeatedly 
+redeploying an application. <a href="https://issues.apache.org/jira/browse/ACCUMULO-2128">ACCUMULO-2128</a> introduces a static utility, 
+org.apache.accumulo.core.util.CleanUp, that users can invoke as part of a 
+teardown hook in their container that will stop these threads and avoid 
+the eventual OutOfMemoryError “PermGen space”.</p>
+
+<h3 id="prefer-ipv4-when-starting-accumulo-processes">Prefer IPv4 when starting Accumulo processes</h3>
+
+<p>While Hadoop <a href="https://wiki.apache.org/hadoop/HadoopIPv6">does not support IPv6 networks</a>, attempting to run on a 
+system that does not have IPv6 completely disabled can cause strange failures.
+<a href="https://issues.apache.org/jira/browse/ACCUMULO-2262">ACCUMULO-2262</a> invokes the JVM-provided configuration parameter at process
+startup to prefer IPv4 over IPv6.</p>
+
+<h3 id="memory-units-in-configuration">Memory units in configuration</h3>
+
+<p>In previous versions, units of memory had to be provided as upper-case (e.g. ‘2G’, not ‘2g’).
+Additionally, a non-intuitive error was printed when a lower-case unit was provided.
+<a href="https://issues.apache.org/jira/browse/ACCUMULO-1933">ACCUMULO-1933</a> allows lower-case memory units in all Accumulo configurations.</p>
+
+<h3 id="apache-thrift-maximum-frame-size">Apache Thrift maximum frame size</h3>
+
+<p>Apache Thrift is used as the internal RPC service. <a href="https://issues.apache.org/jira/browse/ACCUMULO-2360">ACCUMULO-2360</a> allows 
+users to configure the maximum frame size an Accumulo server will read. This 
+prevents non Accumulo client from connecting and causing memory exhaustion.</p>
+
+<h3 id="multitablebatchwriter-concurrency">MultiTableBatchWriter concurrency</h3>
+
+<p>The MultiTableBatchWriter is a class which allows multiple tables to be written to
+from a single object that maintains a single buffer for caching Mutations across all tables. This is desirable
+as it greatly simplifies the JVM heap usage from caching Mutations across
+many tables. Sadly, in Apache Accumulo 1.5.0, concurrent access to a single MultiTableBatchWriter
+heavily suffered from synchronization issues. <a href="https://issues.apache.org/jira/browse/ACCUMULO-1833">ACCUMULO-1833</a> introduces a fix
+which alleviates the blocking and idle-wait that previously occurred when multiple threads accessed
+a single MultiTableBatchWriter instance concurrently.</p>
+
+<h3 id="hadoop-versions">Hadoop Versions</h3>
+
+<p>Since Apache Accumulo 1.5.0 was released, Apache Hadoop 2.2.0 was also released
+as the first generally available (GA) Hadoop 2 release. This was a very exciting release
+for a number of reasons, but this also caused additional effort on Accumulo’s part to
+ensure that Apache Accumulo continues to work across multiple Hadoop versions. Apache Accumulo 1.5.1
+should function with any recent Hadoop 1 or Hadoop 2 without any special steps, tricks or instructions
+required.</p>
+
+<h2 id="notable-bug-fixes">Notable Bug Fixes</h2>
+
+<p>As with any Apache Accumulo release, we have numerous bug fixes that have been fixed. Most
+are very subtle and won’t affect the common user; however, some notable bugs were resolved 
+as a part of 1.5.1 that are rather common.</p>
+
+<h3 id="failure-of-zookeeper-server-in-quorum-kills-connected-accumulo-services">Failure of ZooKeeper server in quorum kills connected Accumulo services</h3>
+
+<p>Apache ZooKeeper provides a number of wonderful features that Accumulo uses to accomplish
+a variety of tasks, most notably a distributed locking service. Typically, multiple ZooKeeper
+servers are run to provide resilience against a certain number of node failures. <a href="https://issues.apache.org/jira/browse/ACCUMULO-1572">ACCUMULO-1572</a>
+resolves an issue where Accumulo processes would kill themselves when the ZooKeeper server they
+were communicating with died instead of failing over to another ZooKeeper server in the quorum.</p>
+
+<h3 id="monitor-table-state-isnt-updated">Monitor table state isn’t updated</h3>
+
+<p>The Accumulo Monitor contains a column for the state of each table in the Accumulo instance.
+The previous resolution was to restart the Monitor process when it got in this state.
+<a href="https://issues.apache.org/jira/browse/ACCUMULO-1920">ACCUMULO-1920</a> resolves an issue where the Monitor would not see updates from ZooKeeper.</p>
+
+<h3 id="two-locations-for-the-same-extent">Two locations for the same extent</h3>
+
+<p>The !METADATA table is the brains behind the data storage for each table, tracking information
+like which files comprise a Tablet, and which TabletServers are hosting which Tablets. <a href="https://issues.apache.org/jira/browse/ACCUMULO-2057">ACCUMULO-2057</a>
+fixes an issue where the !METADATA table contained multiple locations (hosting server) for
+a single Tablet.</p>
+
+<h3 id="deadlock-on-metadata-tablet-unload">Deadlock on !METADATA tablet unload</h3>
+
+<p>Tablets are unloaded, typically, when a shutdown request is issued. <a href="https://issues.apache.org/jira/browse/ACCUMULO-1143">ACCUMULO-1143</a> resolves
+a potential deadlock issue when a merging-minor compaction is issued to flush in-memory data
+to disk before unloading a Tablet.</p>
+
+<h3 id="other-notable-fixes">Other notable fixes</h3>
+
+<ul>
+  <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-1800">ACCUMULO-1800</a> Fixed deletes made via the Proxy.</li>
+  <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-1994">ACCUMULO-1994</a> Fixed ranges in the Proxy.</li>
+  <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-2234">ACCUMULO-2234</a> Fixed offline map reduce over non default HDFS location.</li>
+  <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-1615">ACCUMULO-1615</a> Fixed <code class="highlighter-rouge">service accumulo-tserver stop</code>.</li>
+  <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-1876">ACCUMULO-1876</a> Fixed issues depending on Accumulo using Apache Ivy.</li>
+  <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-2261">ACCUMULO-2261</a> Duplicate locations for a Tablet.</li>
+  <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-2037">ACCUMULO-2037</a> Tablets assigned to previous location.</li>
+  <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-1821">ACCUMULO-1821</a> Avoid recovery on recovering Tablets.</li>
+  <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-2078">ACCUMULO-2078</a> Incorrectly computed ACCUMULO_LOG_HOST in example configurations.</li>
+  <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-1985">ACCUMULO-1985</a> Configuration to bind Monitor on all network interfaces.</li>
+  <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-1999">ACCUMULO-1999</a> Allow ‘0’ to signify random port for the Master.</li>
+  <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-1630">ACCUMULO-1630</a> Fixed GC to interpret any IP/hostname.</li>
+</ul>
+
+<h2 id="known-issues">Known Issues</h2>
+
+<p>When using Accumulo 1.5 and Hadoop 2, Accumulo will call hsync() on HDFS.
+Calling hsync improves durability by ensuring data is on disk (where other older 
+Hadoop versions might lose data in the face of power failure); however, calling
+hsync frequently does noticably slow writes. A simple work around is to increase 
+the value of the tserver.mutation.queue.max configuration parameter via accumulo-site.xml.</p>
+
+<p>A value of “4M” is a better recommendation, and memory consumption will increase by
+the number of concurrent writers to that TabletServer. For example, a value of 4M with
+50 concurrent writers would equate to approximately 200M of Java heap being used for
+mutation queues.</p>
+
+<p>For more information, see <a href="https://issues.apache.org/jira/browse/ACCUMULO-1950">ACCUMULO-1950</a> and <a href="https://issues.apache.org/jira/browse/ACCUMULO-1905?focusedCommentId=13915208&amp;page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13915208">this comment</a>.</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-1956">ACCUMULO-1956</a></li>
+  <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-1428">ACCUMULO-1428</a></li>
+  <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-1687">ACCUMULO-1687</a></li>
+  <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-2141">ACCUMULO-2141</a></li>
+  <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-1946">ACCUMULO-1946</a></li>
+  <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-2223">ACCUMULO-2223</a></li>
+  <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-2226">ACCUMULO-2226</a></li>
+  <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-1470">ACCUMULO-1470</a></li>
+</ul>
+
+<h2 id="testing">Testing</h2>
+
+<p>Below is a list of all platforms that 1.5.1 was tested against by developers. Each Apache Accumulo release
+has a set of tests that must be run before the candidate is capable of becoming an official release. That list includes the following:</p>
+
+<ol>
+  <li>Successfully run all unit tests</li>
+  <li>Successfully run all functional test (test/system/auto)</li>
+  <li>Successfully complete two 24-hour RandomWalk tests (LongClean module), with and without “agitation”</li>
+  <li>Successfully complete two 24-hour Continuous Ingest tests, with and without “agitation”, with data verification</li>
+  <li>Successfully complete two 72-hour Continuous Ingest tests, with and without “agitation”</li>
+</ol>
+
+<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 High-Availability</th>
+      <th>Tests</th>
+    </tr>
+  </thead>
+  <tbody>
+    <tr>
+      <td>CentOS 6.5</td>
+      <td>HDP 2.0 (Apache 2.2.0)</td>
+      <td>6</td>
+      <td>HDP 2.0 (Apache 3.4.5)</td>
+      <td>Yes (QJM)</td>
+      <td>All required tests</td>
+    </tr>
+    <tr>
+      <td>CentOS 6.4</td>
+      <td>CDH 4.5.0 (2.0.0+cdh4.5.0)</td>
+      <td>7</td>
+      <td>CDH 4.5.0 (3.4.5+cdh4.5.0)</td>
+      <td>Yes (QJM)</td>
+      <td>Unit, functional and 24hr Randomwalk w/ agitation</td>
+    </tr>
+    <tr>
+      <td>CentOS 6.4</td>
+      <td>CDH 4.5.0 (2.0.0+cdh4.5.0)</td>
+      <td>7</td>
+      <td>CDH 4.5.0 (3.4.5+cdh4.5.0)</td>
+      <td>Yes (QJM)</td>
+      <td>2x 24/hr continuous ingest w/ verification</td>
+    </tr>
+    <tr>
+      <td>CentOS 6.3</td>
+      <td>Apache 1.0.4</td>
+      <td>1</td>
+      <td>Apache 3.3.5</td>
+      <td>No</td>
+      <td>Local testing, unit and functional tests</td>
+    </tr>
+    <tr>
+      <td>RHEL 6.4</td>
+      <td>Apache 2.2.0</td>
+      <td>10</td>
+      <td>Apache 3.4.5</td>
+      <td>No</td>
+      <td>Functional tests</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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http://git-wip-us.apache.org/repos/asf/accumulo-website/blob/c0655661/release/accumulo-1.5.2/index.html
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+          
+          <h1 class="title">Apache Accumulo 1.5.2</h1>
+          
+          <p>19 Sep 2015</p>
+
+<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-apache-thrift-proxy">Add configurable maximum frame size to Apache 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.</p>
+
+<table id="release_notes_testing" class="table">
+  <thead>
+    <tr>
+      <th>OS</th>
+      <th>Hadoop</th>
+      <th>Nodes</th>
+      <th>ZooKeeper</th>
+      <th>HDFS High-Availability</th>
+      <th>Tests</th>
+    </tr>
+  </thead>
+  <tbody>
+    <tr>
+      <td>Gentoo</td>
+      <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>
+  </tbody>
+</table>
+
+
+
+<p><strong>View all releases in the <a href="/release/">archive</a></strong></p>
+
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+
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http://git-wip-us.apache.org/repos/asf/accumulo-website/blob/c0655661/release/accumulo-1.5.3/index.html
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+  });
+
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+    // decorate section headers with anchors
+    return $("h2, h3, h4, h5, h6").each(function(i, el) {
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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 1.5.3</h1>
+          
+          <p>25 Jun 2015</p>
+
+<p>Apache Accumulo 1.5.3 is a bug-fix release for the 1.5 series. It is likely to be the last
+1.5 release, with development shifting towards newer release lines. We recommend upgrading
+to a newer version to continue to get bug fixes and new features.</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 “patch version”. This means that there should be no public API changes. Any
+changes which were made were done in a backwards-compatible manner. Code that
+runs against 1.5.2 should run against 1.5.3.</p>
+
+<p>We’d like to thank all of the committers and contributors which had a part in
+making this release, from code contributions to testing. Everyone’s efforts are
+greatly appreciated.</p>
+
+<h2 id="security-changes">Security Changes</h2>
+
+<h3 id="sslv3-disabled-poodleaccumulo-3316"><a href="https://issues.apache.org/jira/browse/ACCUMULO-3316">SSLv3 disabled (POODLE)</a></h3>
+
+<p>Many Accumulo services were capable of enabling wire encryption using
+SSL connectors. To be safe, <a href="https://issues.apache.org/jira/browse/ACCUMULO-3316">ACCUMULO-3316</a> disables the problematic SSLv3 version by default which was
+potentially susceptible to the man-in-the-middle attack. <a href="https://issues.apache.org/jira/browse/ACCUMULO-3317">ACCUMULO-3317</a> also disables SSLv3 in the monitor,
+so it will not accept SSLv3 client connections, when running it with https.</p>
+
+<h2 id="notable-bug-fixes">Notable Bug Fixes</h2>
+
+<h3 id="sourceswitchingiterator-deadlockaccumulo-3745"><a href="https://issues.apache.org/jira/browse/ACCUMULO-3745">SourceSwitchingIterator Deadlock</a></h3>
+
+<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>
+
+<h3 id="table-flush-blocked-indefinitelyaccumulo-3597"><a href="https://issues.apache.org/jira/browse/ACCUMULO-3597">Table flush blocked indefinitely</a></h3>
+
+<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>
+
+<h3 id="rpc-connections-not-cachedaccumulo-3574"><a href="https://issues.apache.org/jira/browse/ACCUMULO-3574">RPC Connections not cached</a></h3>
+
+<p>It was observed that the underlying connection for invoking RPCs were not actually being cached,
+despite it being requested that they should be cached. While this did not result in a noticed
+performance impact, it was deficiency. <a href="https://issues.apache.org/jira/browse/ACCUMULO-3574">ACCUMULO-3574</a> ensures that connections are cached when
+it is requested that they are.</p>
+
+<h3 id="deletes-on-apache-thrift-proxy-api-ignoredaccumulo-3474"><a href="https://issues.apache.org/jira/browse/ACCUMULO-3474">Deletes on Apache Thrift Proxy API ignored</a></h3>
+
+<p>A user noted that when trying to specify a delete using the Accumulo Thrift Proxy, the delete
+was treated as an update. <a href="https://issues.apache.org/jira/browse/ACCUMULO-3474">ACCUMULO-3474</a> fixes the Proxy server such that deletes are properly
+respected as specified by the client.</p>
+
+<h2 id="other-changes">Other Changes</h2>
+
+<p>Other changes for this version can be found <a href="https://issues.apache.org/jira/browse/ACCUMULO/fixforversion/12328662">in JIRA</a>.</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 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 High-Availability</th>
+      <th>Tests</th>
+    </tr>
+  </thead>
+  <tbody>
+    <tr>
+      <td>Gentoo</td>
+      <td>2.6.0</td>
+      <td>1</td>
+      <td>3.4.5</td>
+      <td>No</td>
+      <td>Unit and Integration Tests</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</td>
+    </tr>
+  </tbody>
+</table>
+
+
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+          
+          <h1 class="title">Apache Accumulo 1.5.4</h1>
+          
+          <p>21 Sep 2015</p>
+
+<p>Apache Accumulo 1.5.4 is one more bug-fix release for the 1.5 series. Like 1.5.3 before it, this release contains a
+very small changeset when considering the normal size of changes in a release.</p>
+
+<p>This release contains no changes to the <a href="https://github.com/apache/accumulo/blob/1.7.0/README.md#api">public API</a>. As such, there are no concerns
+for the compatibility of user code running against 1.5.3. All users are encourage to upgrade
+immediately without concern of stability and compatibility.</p>
+
+<p>A full list of changes is available via <a href="https://issues.apache.org/jira/secure/ReleaseNote.jspa?projectId=12312121&amp;version=12333106">CHANGES</a>.</p>
+
+<p>We’d like to thank all of the committers and contributors which had a part in
+making this release, from code contributions to testing. Everyone’s efforts are
+greatly appreciated.</p>
+
+<h2 id="correctness-bugs">Correctness Bugs</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 1.5.4.</p>
+
+<p>Thanks to Edward Seidl for reporting this bug to us!</p>
+
+<h2 id="server-side-auditing-changes">Server-side auditing changes</h2>
+
+<p>Thanks to James Mello for reporting and providing the fixes to the following server-side auditing issues.</p>
+
+<h3 id="incorrect-audit-initialization">Incorrect audit initialization</h3>
+
+<p>It was observed that the implementation used to audit user API requests on Accumulo server processes
+was not being correctly initialized which caused audit messages to never be generated. This was rectified
+in <a href="https://issues.apache.org/jira/browse/ACCUMULO-3939">ACCUMULO-3939</a>.</p>
+
+<h3 id="missing-audit-implementations">Missing audit implementations</h3>
+
+<p>It was also observed that some server-side API implementations did not include audit messages which resulted
+in an incomplete historical picture on what operations a user might have invoked. The missing audits (and those
+that were added) are described in <a href="https://issues.apache.org/jira/browse/ACCUMULO-3946">ACCUMULO-3946</a>.</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 fail-over.</p>
+
+<table id="release_notes_testing" class="table">
+  <thead>
+    <tr>
+      <th>OS</th>
+      <th>Hadoop</th>
+      <th>Nodes</th>
+      <th>ZooKeeper</th>
+      <th>HDFS High-Availability</th>
+      <th>Tests</th>
+    </tr>
+  </thead>
+  <tbody>
+    <tr>
+      <td>OSX</td>
+      <td>2.6.0</td>
+      <td>1</td>
+      <td>3.4.5</td>
+      <td>No</td>
+      <td>Unit and Functional Tests</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 (10B entries), Randomwalk (24hrs)</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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