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Posted to commits@accumulo.apache.org by bu...@apache.org on 2014/09/19 22:00:29 UTC
svn commit: r922874 - in /websites/staging/accumulo/trunk/content: ./
release_notes/1.5.2.html
Author: buildbot
Date: Fri Sep 19 20:00:29 2014
New Revision: 922874
Log:
Staging update by buildbot for accumulo
Added:
websites/staging/accumulo/trunk/content/release_notes/1.5.2.html
Modified:
websites/staging/accumulo/trunk/content/ (props changed)
Propchange: websites/staging/accumulo/trunk/content/
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+
+ <h1 class="title">Apache Accumulo 1.5.1 Release Notes</h1>
+
+ <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="http://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="thrift-maximum-frame-size">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>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&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.
+<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>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>
+</table></p>
+ </div>
+
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