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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 1.8.0</h1> + + <p>06 Sep 2016</p> + +<p>Apache Accumulo 1.8.0 is a significant release that includes many important +milestone features which expand the functionality of Accumulo. These include +features related to security, availability, and extensibility. Over +350 JIRA issues were resolved in this version. This includes over +200 bug fixes and 71 improvements and 4 new features. See <a href="https://issues.apache.org/jira/secure/ReleaseNote.jspa?projectId=12312121&version=12329879";>JIRA</a> +for the complete list.</p> + +<p>Below are resources for this release:</p> + +<ul> + <li><a href="/1.8/accumulo_user_manual.html">User Manual</a></li> + <li><a href="/1.8/apidocs">Javadocs</a></li> + <li><a href="/1.8/examples">Examples</a></li> +</ul> + +<p>In the context of Accumuloâs <a href="http://semver.org";>Semantic Versioning</a> <a href="https://github.com/apache/accumulo/blob/1.8/README.md#api";>guidelines</a>, +this is a âminor versionâ. This means that new APIs have been created, some +deprecations may have been added, but no deprecated APIs have been removed. +Code written against 1.7.x should work against 1.8.0 â binary compatibility +has been preserved with one exception of an already-deprecated Mock Accumulo +utility class. As always, the Accumulo developers take API compatibility +very seriously and have invested much time to ensure that we meet the promises set forth to our users.</p> + +<h2 id="major-changes">Major Changes</h2> + +<h3 id="speed-up-wal-roll-overs">Speed up WAL roll overs</h3> + +<p>Performance of writing mutations is improved by refactoring the +bookeeping required for Write-Ahead Log (WAL) files and by creating a +standby WAL for faster switching when the log is full. This was a +substantial refactor in the way WALs worked, but smoothes overall +ingest performance in addition to provides a increase in write speed +as shown by the simple test below. The top entry is before +<a href="https://issues.apache.org/jira/browse/ACCUMULO-3423";>ACCUMULO-3423</a> and the bottom graph is after the +refactor.</p> + +<p><img src="https://issues.apache.org/jira/secure/attachment/12705402/WAL-slowdown-graphs.jpg"; alt="Graph of WAL speed up after ACCUMULO-3423" title="Graph of WAL speed up after ACCUMULO-3423" /></p> + +<h3 id="user-level-api-for-rfile">User level API for RFile</h3> + +<p>Previously the only public API available to write RFiles was via the AccumuloFileOutputFormat. There was no way to read RFiles in the public +API. <a href="https://issues.apache.org/jira/browse/ACCUMULO-4165";>ACCUMULO-4165</a> exposes a brand new public <a href="../1.8/apidocs/org/apache/accumulo/core/client/rfile/RFile.html">API</a> for reading and writing RFiles as well as cleans up some of the internal APIs.</p> + +<h3 id="suspend-tablet-assignment-for-rolling-restarts">Suspend Tablet assignment for rolling restarts</h3> + +<p>When a tablet server dies, Accumulo attempted to reassign the tablets as quickly as possible to maintain availability. +A new configuration property <code class="highlighter-rouge">table.suspend.duration</code> (with a default of zero seconds) now controls how long to wait before reassigning +a tablet from a dead tserver. The property is configurable via the +Accumulo shell, so you can set it, do a rolling restart, and then +set it back to 0. A new state as introduced, TableState.SUSPENDED to support this feature. By default, metadata tablet +reassignment is not suspended, but that can also be changed with the <code class="highlighter-rouge">master.metadata.suspendable</code> property that is false by +default. Root tablet assignment can not be suspended. See <a href="https://issues.apache.org/jira/browse/ACCUMULO-4353";>ACCUMULO-4353</a> for more info.</p> + +<h3 id="run-multiple-tablet-servers-on-one-node">Run multiple Tablet Servers on one node</h3> + +<p><a href="https://issues.apache.org/jira/browse/ACCUMULO-4328";>ACCUMULO-4328</a> introduces the capability of running multiple tservers on a single node. This is intended for nodes with a large +amounts of memory and/or disk. This feature is disabled by default. There are several related tickets: <a href="https://issues.apache.org/jira/browse/ACCUMULO-4072";>ACCUMULO-4072</a>, <a href="https://issues.apache.org/jira/browse/ACCUMULO-4331";>ACCUMULO-4331</a> +and <a href="https://issues.apache.org/jira/browse/ACCUMULO-4406";>ACCUMULO-4406</a>. Note that when this is enabled, the names of the log files change. Previous log file names were defined in the +generic_logger.xml as <code class="highlighter-rouge">${org.apache.accumulo.core.application}_{org.apache.accumulo.core.ip.localhost.hostname}.log</code>. +The files will now include the instance id after the application with +<code class="highlighter-rouge">${org.apache.accumulo.core.application}_${instance}_${org.apache.accumulo.core.ip.localhost.hostname}.log</code>.</p> + +<p>For example: tserver_host.domain.com.log will become tserver_1_host.domain.log when multiple TabletServers +are run per host. The same change also applies to the debug logs provided in the example configurations. The log +names do not change if this feature is not used.</p> + +<h3 id="rate-limiting-major-compactions">Rate limiting Major Compactions</h3> + +<p>Major Compactions can significantly increase the amount of load on +TabletServers. <a href="https://issues.apache.org/jira/browse/ACCUMULO-4187";>ACCUMULO-4187</a> restricts the rate at which data is +read and written when performing major compactions. This has a direct +effect on the IO load caused by major compactions with a similar +effect on the CPU utilization. This behavior is controlled by a new +property <code class="highlighter-rouge">tserver.compaction.major.throughput</code> with a defaults of 0B +which disables the rate limiting.</p> + +<h3 id="table-sampling">Table Sampling</h3> + +<p>Queryable sample data was added by <a href="https://issues.apache.org/jira/browse/ACCUMULO-3913";>ACCUMULO-3913</a>. This allows users to configure a pluggable +function to generate sample data. At scan time, the sample data can optionally be scanned. +Iterators also have access to sample data. Iterators can access all data and sample data, this +allows an iterator to use sample data for query optimizations. The new user level RFile API +supports writing RFiles with sample data for bulk import.</p> + +<p>A simple configurable sampler function is included with Accumulo. This sampler uses hashing and +can be configured to use a subset of Key fields. For example if it was desired to have entire rows +in the sample, then this sampler would be configured to hash+mod the row. Then when a row is +selected for the sample, all of its columns and all of its updates will be in the sample data. +Another scenario is one in which a document id is in the column qualifier. In this scenario, one +would either want all data related to a document in the sample data or none. To achieve this, the +sample could be configured to hash+mod on the column qualifier. See the sample <a href="../1.8/examples/sample">Readme +example</a> and javadocs on the new APIs for more information.</p> + +<p>For sampling to work, all tablets scanned must have pre-generated sample data that was generated in +the same way. If this is not the case then scans will fail. For existing tables, samples can be +generated by configuring sampling on the table and compacting the table.</p> + +<h3 id="upgrade-to-apache-thrift-093">Upgrade to Apache Thrift 0.9.3</h3> + +<p>Accumulo relies on Apache Thrift to implement remote procedure calls +between Accumulo services. Ticket <a href="https://issues.apache.org/jira/browse/ACCUMULO-4077";>ACCUMULO-4077</a> +updates our dependency to 0.9.3. See the +<a href="https://github.com/apache/thrift/blob/0.9.3/CHANGES";>Apache Thrift 0.9.3 Release Notes</a> for details on +the changes to Thrift. <strong>NOTE:</strong> The Thrift 0.9.3 Java library is not +compatible other versions of Thrift. Applications running against Accumulo +1.8 must use Thrift 0.9.3. Different versions of Thrift on the classpath +will not work.</p> + +<h3 id="iterator-test-harness">Iterator Test Harness</h3> + +<p>Users often write a new iterator without fully understanding its limits and lifetime. Previously, Accumulo did +not provide any means in which a user could test iterators to catch common issues that only become apparent +in multi-node production deployments. <a href="https://issues.apache.org/jira/browse/ACCUMULO-626";>ACCUMULO-626</a> provides a framework and a collection of initial tests +which can be used to simulate common issues with Iterators that only appear in production deployments. This test +harness can be used directly by users as a supplemental tool to unit tests and integration tests with MiniAccumuloCluster.</p> + +<p>Please see the <a href="../1.8/accumulo_user_manual.html#_iterator_testing">Accumulo User Manual chapter on Iterator Testing</a> for more information</p> + +<h3 id="default-port-for-monitor-changed-to-9995">Default port for Monitor changed to 9995</h3> + +<p>Previously, the default port for the monitor was 50095. You will need to update your links to point to port 9995. The default +port for the GC process was also changed from 50091 to 9998, although this an RPC port used internally and automatically discovered. +These default ports were changed because the previous defaults fell in the Linux Ephemeral port range. This means that the operating +system, when a port in this range was unusued, would allocate this port for dynamic network communication. This has the side-effect of +temporal bind issues when trying to start these services (as the operating +system might have allocated them elsewhere). By moving these +defaults out of the ephemeral range, we can guarantee that the Monitor and GC +will reliably start. These values are still configurable by setting +<code class="highlighter-rouge">monitor.port.client</code>and <code class="highlighter-rouge">gc.port.client</code> in the accumulo-site.xml.</p> + +<h2 id="other-notable-changes">Other Notable Changes</h2> + +<ul> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-1055";>ACCUMULO-1055</a> Configurable maximum file size for merging minor compactions</li> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-1124";>ACCUMULO-1124</a> Optimization of RFile index</li> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-2883";>ACCUMULO-2883</a> API to fetch current tablet assignments</li> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3871";>ACCUMULO-3871</a> Support for running integration tests in MapReduce</li> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3920";>ACCUMULO-3920</a> Deprecate the MockAccumulo class and remove usage in our tests</li> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-4339";>ACCUMULO-4339</a> Make hadoop-minicluster optional dependency of acccumulo-minicluster</li> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-4318";>ACCUMULO-4318</a> BatchWriter, ConditionalWriter, and ScannerBase now extend AutoCloseable</li> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-4326";>ACCUMULO-4326</a> Value constructor now accepts Strings (and Charsequences)</li> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-4354";>ACCUMULO-4354</a> Bump dependency versions to include gson, jetty, and sl4j</li> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3735";>ACCUMULO-3735</a> Bulk Import status page on the monitor</li> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-4066";>ACCUMULO-4066</a> Reduced time to processes conditional mutations.</li> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-4164";>ACCUMULO-4164</a> Reduced seek time for cached data.</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>CentOS7/openJDK7/EC2; 3 m3.xlarge leaders, 8 d2.xlarge workers</td> + <td>2.6.4</td> + <td>11</td> + <td>3.4.8</td> + <td>No</td> + <td>24 HR Continuous Ingest without Agitation.</td> + </tr> + <tr> + <td>CentOS7/openJDK7/EC2; 3 m3.xlarge leaders, 8 d2.xlarge workers</td> + <td>2.6.4</td> + <td>11</td> + <td>3.4.8</td> + <td>No</td> + <td>16 HR Continuous Ingest with Agitation.</td> + </tr> + <tr> + <td>CentOS7/openJDK7/OpenStack VMs (16G RAM 2cores 2disk3; 1 leader, 5 workers</td> + <td>HDP 2.5 (Hadoop 2.7)</td> + <td>7</td> + <td>HDP 2.5 (ZK 3.4)</td> + <td>No</td> + <td>24 HR Continuous Ingest without Agitation.</td> + </tr> + <tr> + <td>CentOS7/openJDK7/OpenStack VMs (16G RAM 2cores 2disk3; 1 leader, 5 workers</td> + <td>HDP 2.5 (Hadoop 2.7)</td> + <td>7</td> + <td>HDP 2.5 (ZK 3.4)</td> + <td>No</td> + <td>24 HR Continuous Ingest with Agitation.</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> + </div> + </div> +</body> +</html>
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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>Accumuloâs 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 âPermGen spaceâ.</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. â2Gâ, not â2gâ). -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 Accumuloâs 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 wonât 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 isnât 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 â0â 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 â4Mâ 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 âagitationâ</li> - <li>Successfully complete two 24-hour Continuous Ingest tests, with and without âagitationâ, with data verification</li> - <li>Successfully complete two 72-hour Continuous Ingest tests, with and without âagitationâ</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> - - - </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. 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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 -âout of the boxâ, 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 couldnât 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> - - - </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> - </div> - </div> -</body> +<title>Redirectingâ¦</title> +<link rel="canonical" href="https://accumulo.apache.org/release/accumulo-1.5.2/";> +<meta http-equiv="refresh" content="0; url=https://accumulo.apache.org/release/accumulo-1.5.2/";> +<h1>Redirectingâ¦</h1> +<a href="https://accumulo.apache.org/release/accumulo-1.5.2/";>Click here if you are not redirected.</a> +<script>location="https://accumulo.apache.org/release/accumulo-1.5.2/";</script> </html>
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