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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 1.6.3</h1> + + <p>04 Jul 2015</p> + +<p>Apache Accumulo 1.6.3 is a maintenance release on the 1.6 version branch. +This release contains changes from over 63 issues, comprised of bug-fixes, +performance improvements and better test cases. See <a href="https://issues.apache.org/jira/browse/ACCUMULO/fixforversion/12329154";>JIRA</a> for a +complete list.</p> + +<p>Users of 1.6.0, 1.6.1, and 1.6.2 are strongly encouraged to update as soon as +possible to benefit from the improvements with very little concern in change +of underlying functionality. Users of 1.4 or 1.5 that are seeking to upgrade +to 1.6 should consider 1.6.3 as a starting point. For information about +improvements since Accumulo 1.5, see the <a href="/release_notes/1.6.0">1.6.0</a>, <a href="/release_notes/1.6.1">1.6.1</a>, and +<a href="/release_notes/1.6.2">1.6.2</a> release notes.</p> + +<h2 id="fixed-batchwriter-hold-time-error">Fixed BatchWriter hold time error</h2> + +<p>In previous releases, a <code class="highlighter-rouge">BatchWriter</code> could fail with a +<code class="highlighter-rouge">MutationsRejectedException</code> with server errors. If inspection of the tserver +logs showed <code class="highlighter-rouge">HoldTimeoutException</code> was the cause, the workaround was to +increase the value of <code class="highlighter-rouge">general.rpc.timeout</code>. Changing this setting is no +longer necessary as this bug was fixed by <a href="https://issues.apache.org/jira/browse/ACCUMULO-2388";>ACCUMULO-2388</a>.</p> + +<h2 id="severe-bug-fixes">Severe bug fixes</h2> + +<ul> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3597";>ACCUMULO-3597</a> Fixed a deadlock where a table flush and +metadata tablet load were waiting on each other. This was a rare bug. If it +occurred it could impact the availability of Accumulo as most Accumulo +operations depend on metadata tablets.</li> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3709";>ACCUMULO-3709</a> Fixed a potential data loss bug where +AccumuloOutputFormat close did not rethrow exception.</li> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3745";>ACCUMULO-3745</a> Fixed a deadlock in SourceSwitchingIterator +that occurred when using custom iterators that called <code class="highlighter-rouge">deepCopy</code>. This bug +would cause scans to hang indefinitely until the offending tserver was killed.</li> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3859";>ACCUMULO-3859</a> Fixed a race condition that could prevent table +constraints from ever loading for a Tablet. It is likely to only affect users +when the constraint is first added to a table.</li> +</ul> + +<h2 id="notable-bug-fixes">Notable bug fixes</h2> + +<ul> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3589";>ACCUMULO-3589</a> <code class="highlighter-rouge">du</code> in Shell does not check table existence.</li> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3692";>ACCUMULO-3692</a> Offlineâing a table disabled subsequent balancing.</li> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3696";>ACCUMULO-3696</a> Tracing could queue too many traces</li> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3718";>ACCUMULO-3718</a> Fixed a bug that prevented a Mutation from +being created in Scala.</li> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3747";>ACCUMULO-3747</a> Thrashing tablet servers would be removed from the Monitorâs Dead Server list.</li> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3750";>ACCUMULO-3750</a> Fixed an issue where the Master would perpetually +fail when there was a bad <code class="highlighter-rouge">instance.secret</code> setting.</li> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3784";>ACCUMULO-3784</a> Fixed a bug in <code class="highlighter-rouge">getauths</code> Shell command where it +treated visibilities that differed only in case as the same.</li> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3796";>ACCUMULO-3796</a> Added documentation about turning off zone +reclaim.</li> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3880";>ACCUMULO-3880</a> Fixed an issue where malformed configuration caused +TabletServers to shutdown.</li> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3890";>ACCUMULO-3890</a> Fixed a performance issue with CredentialProvider. Information +stored in the CredentialProvider was not cached which resulted in repeatedly reading the +file from HDFS which can degrade HDFS performance.</li> +</ul> + +<h2 id="known-issues">Known Issues</h2> + +<p>During testing <a href="https://issues.apache.org/jira/browse/HDFS-8406";>HDFS-8406</a> was encountered which is summarized by write-ahead log recovery +that was never completed due to an inability to recover the HDFS lease on the WAL. To work around +this issue, the following steps can be done:</p> + +<ol> + <li>Locate block for walog whose lease can not be recovered.</li> + <li>Copy block into HDFS as temp file TMP_WALOG</li> + <li>Delete the walog whose lease can not be recovered.</li> + <li>Move TMP_WALOG to the filename of the walog deleted in the previous step.</li> +</ol> + +<p>Using the <code class="highlighter-rouge">fetchColumns()</code> method on a scanner in conjunction with custom iterators that +add column families in their <code class="highlighter-rouge">seek()</code> method can lead to unexpected behavior. See +<a href="https://issues.apache.org/jira/browse/ACCUMULO-3905";>ACCUMULO-3905</a> for more details. In that issue javadoc updates were made, +but the updates did not make it into 1.6.3.</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 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 HA</th> + <th>Tests</th> + </tr> + </thead> + <tbody> + <tr> + <td>Amazon Linux 2014.09</td> + <td>2.6.0</td> + <td>20</td> + <td>3.4.5</td> + <td>No</td> + <td>24hr ContinuousIngest w/ verification w/ and w/o agitation</td> + </tr> + <tr> + <td>Amazon Linux 2014.09</td> + <td>2.6.0</td> + <td>20</td> + <td>3.4.5</td> + <td>No</td> + <td>24hr Randomwalk w/o agitation</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 (6B entries)</td> + </tr> + <tr> + <td>Centos 6.6</td> + <td>2.2.0</td> + <td>6</td> + <td>3.4.5</td> + <td>No</td> + <td>All integration test passed. Some needed to be run a 2nd time.</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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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 1.6.4</h1> + + <p>03 Oct 2015</p> + +<p>Apache Accumulo 1.6.4 is a maintenance release on the 1.6 version branch. +This release contains changes from 21 issues, comprised of bug-fixes, +performance improvements and better test cases. See <a href="https://issues.apache.org/jira/browse/ACCUMULO/fixforversion/12332840";>JIRA</a> for a +complete list.</p> + +<p>Users of any previous 1.6.x release are strongly encouraged to update as soon as +possible to benefit from the improvements with very little concern in change +of underlying functionality. Users of 1.4 or 1.5 that are seeking to upgrade +to 1.6 should consider 1.6.4 as a starting point.</p> + +<h2 id="silent-data-loss-via-bulk-imported-files">Silent data-loss via bulk imported files</h2> + +<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 1.6.4.</p> + +<h2 id="other-bug-fixes">Other bug fixes</h2> + +<ul> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3979";>ACCUMULO-3979</a> Fixed an issue where the BulkImporter failed +with an error message âQUERY_METADATA already startedâ.</li> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3965";>ACCUMULO-3965</a> The <code class="highlighter-rouge">listscans</code> shell command did not contain +the <code class="highlighter-rouge">scanId</code> attribute for currently running scans.</li> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3946";>ACCUMULO-3946</a> Verified that all user-facing operations contained +appropriate audit messages.</li> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3977";>ACCUMULO-3977</a> Isolated scans with Iterators in use incorrectly +fail around invocation of <code class="highlighter-rouge">deepCopy</code>.</li> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3905";>ACCUMULO-3905</a> RowDeletingIterator functions incorrectly when +columns are provided by the client. This restores intended functionality without +the need for a <a href="https://issues.apache.org/jira/browse/ACCUMULO-1801?focusedCommentId=13970204&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13970204";>workaround</a>.</li> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3959";>ACCUMULO-3959</a> <a href="https://issues.apache.org/jira/browse/ACCUMULO-3934";>ACCUMULO-3934</a> Multiple documentation +improvements to <code class="highlighter-rouge">BatchScanner</code>.</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 HA</th> + <th>Tests</th> + </tr> + </thead> + <tbody> + <tr> + <td>Amazon Linux 2014.09</td> + <td>2.6.0</td> + <td>20</td> + <td>3.4.5</td> + <td>No</td> + <td>ContinuousIngest w/ verification w/ and w/o agitation (37B entries)</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. 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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 1.6.5</h1> + + <p>17 Feb 2016</p> + +<p>Apache Accumulo 1.6.5 is a maintenance release on the 1.6 version branch. This +release contains changes from 55 issues, comprised of bug-fixes, performance +improvements, build quality improvements, and more. See <a href="https://issues.apache.org/jira/browse/ACCUMULO/fixforversion/12333674";>JIRA</a> for a +complete list.</p> + +<p>Users of any previous 1.6.x release are strongly encouraged to update as soon as +possible to benefit from the improvements with very little concern in change of +underlying functionality. Users of 1.4 or 1.5 that are seeking to upgrade to 1.6 +should consider 1.6.5 as a starting point.</p> + +<h2 id="outstanding-known-issues">Outstanding Known Issues</h2> + +<p>Be aware that a small documentation bug exists with the compact command in the +shell (<a href="https://issues.apache.org/jira/browse/ACCUMULO-4138";>ACCUMULO-4138</a>). The documentation for the begin row and +end row should be described as exclusive and inclusive, respectively, rather +than the incorrect description of both being inclusive.</p> + +<h2 id="highlights">Highlights</h2> + +<h3 id="queued-compactions-not-running">Queued Compactions Not Running</h3> + +<p>Found and fixed a bug (<a href="https://issues.apache.org/jira/browse/ACCUMULO-4016";>ACCUMULO-4016</a>) in which some queued +compactions would never run if the number of files changed while the tablet was +queued.</p> + +<h3 id="faster-processing-of-conditional-mutations">Faster Processing of Conditional Mutations</h3> + +<p>Improved ConditionalMutation processing time by a factor of 3. +(<a href="https://issues.apache.org/jira/browse/ACCUMULO-4066";>ACCUMULO-4066</a>)</p> + +<h3 id="slow-gc-while-bulk-importing">Slow GC While Bulk Importing</h3> + +<p>Found and worked around an issue where lots of bulk imports creating many new +files would significantly impair the Accumulo GC service, and possibly prevent +it from running to completion entirely. (<a href="https://issues.apache.org/jira/browse/ACCUMULO-4021";>ACCUMULO-4021</a>)</p> + +<h3 id="improvements-in-locating-client-configuration-file">Improvements in Locating Client Configuration File</h3> + +<p>Fixed some unexpected error messages related to setting +ACCUMULO_CLIENT_CONF_PATH, and improved the detection of the client.conf file if +ACCUMULO_CLIENT_CONF_PATH was set to a directory containing client.conf. +(<a href="https://issues.apache.org/jira/browse/ACCUMULO-4026";>ACCUMULO-4026</a>,<a href="https://issues.apache.org/jira/browse/ACCUMULO-4027";>ACCUMULO-4027</a>)</p> + +<h3 id="transient-zookeeper-disconnect-causes-fate-threads-to-exit">Transient ZooKeeper disconnect causes FATE threads to exit</h3> + +<p>ZooKeeper clients are expected to handle the situation where they become +disconnected from the ZooKeeper server and must wait to be reconnected +before continuing ZooKeeper operations.</p> + +<p>The dedicated threads running inside the Accumulo Master process for FATE +actions had the potential unexpectedly exit in this disconnected state. +This caused a scenario where all future FATE-based operations would +be blocked until the Accumulo Master process was restarted. (<a href="https://issues.apache.org/jira/browse/ACCUMULO-4060";>ACCUMULO-4060</a>)</p> + +<h3 id="incorrect-management-of-certain-apache-thrift-rpcs">Incorrect management of certain Apache Thrift RPCs</h3> + +<p>Accumulo relies on Apache Thrift to implement remote procedure calls between +Accumulo services. Accumuloâs use of Thrift uncovered an unfortunate situation +where a special RPC (a âonewayâ call) would leave unwanted data on the underlying +Thrift connection. After this extra data was left on connection, all subsequent RPCs +re-using that connection would fail with âout of sequence responseâ error messages. +Accumulo would be left in a bad state until the mishandled connections were released +or Accumulo services were restarted. (<a href="https://issues.apache.org/jira/browse/ACCUMULO-4065";>ACCUMULO-4065</a>)</p> + +<h2 id="other-notable-changes">Other Notable Changes</h2> + +<ul> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3509";>ACCUMULO-3509</a> Fixed some lock contention in TabletServer, preventing resource cleanup</li> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-3734";>ACCUMULO-3734</a> Fixed quote-escaping bug in VisibilityConstraint</li> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-4025";>ACCUMULO-4025</a> Fixed cleanup of bulk load fate transactions</li> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-4070";>ACCUMULO-4070</a> Fixed Kerberos ticket renewal for all Accumulo services</li> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-4098";>ACCUMULO-4098</a>,<a href="https://issues.apache.org/jira/browse/ACCUMULO-4113";>ACCUMULO-4113</a> Fixed widespread misuse of ByteBuffer</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 HA</th> + <th>Tests</th> + </tr> + </thead> + <tbody> + <tr> + <td>CentOS 7.1</td> + <td>2.6.3</td> + <td>9</td> + <td>3.4.6</td> + <td>No</td> + <td>Random walk (All.xml) 18-hour run (2 failures, both conflicting operations on same table in Concurrent test)</td> + </tr> + <tr> + <td>CentOS 7.1</td> + <td>2.6.3</td> + <td>6</td> + <td>3.4.6</td> + <td>No</td> + <td>Continuous ingest with agitation (2B entries)</td> + </tr> + <tr> + <td>CentOS 6.7</td> + <td>2.2.0 and 1.2.1</td> + <td>1</td> + <td>3.3.6</td> + <td>No</td> + <td>All unit and integration tests</td> + </tr> + <tr> + <td>CentOS 7.1 (Oracle JDK8)</td> + <td>2.6.3</td> + <td>9</td> + <td>3.4.6</td> + <td>No</td> + <td>Continuous ingest with agitation (24hrs, 32B entries verified) on EC2 (1 m3.xlarge leader; 8 d2.xlarge workers)</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. 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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 1.6.6</h1> + + <p>18 Sep 2016</p> + +<p>Apache Accumulo 1.6.6 is a maintenance release on the 1.6 version branch. This +release contains changes from more than 40 issues, comprised of bug-fixes, +performance improvements, build quality improvements, and more. See +<a href="https://issues.apache.org/jira/secure/ReleaseNote.jspa?projectId=12312121&version=12334846";>JIRA</a> for a complete list.</p> + +<p>Below are resources for this release:</p> + +<ul> + <li><a href="/1.6/accumulo_user_manual.html">User Manual</a></li> + <li><a href="/1.6/apidocs">Javadocs</a></li> + <li><a href="/1.6/examples">Examples</a></li> +</ul> + +<p>Users of any previous 1.6.x release are strongly encouraged to update as soon +as possible to benefit from the improvements with very little concern in change +of underlying functionality.</p> + +<p>As of this release, active development has ceased for the 1.6 release line, so +users should consider upgrading to a newer, actively maintained version when +they can. While the developers may release another 1.6 version to address a +severe issue, thereâs a strong possibility that this will be the last 1.6 +release. That would also mean that this will be the last Accumulo version to +support Java 6 and Hadoop 1.</p> + +<h2 id="highlights">Highlights</h2> + +<h3 id="write-ahead-logs-can-be-prematurely-deleted">Write-Ahead Logs can be prematurely deleted</h3> + +<p>There were cases where the Accumulo Garbage Collector may inadvertently delete +a WAL for a tablet server that it has erroneously determined to be down, +causing data loss. This has been corrected. See <a href="https://issues.apache.org/jira/browse/ACCUMULO-4157";>ACCUMULO-4157</a> +for additional detail.</p> + +<h3 id="upgrade-to-commons-vfs-21">Upgrade to Commons-VFS 2.1</h3> + +<p>Upgrading to Apache Commons VFS 2.1 fixes several issues with classloading out +of HDFS. For further detail see <a href="https://issues.apache.org/jira/browse/ACCUMULO-4146";>ACCUMULO-4146</a>. Additional +fixes to a potential HDFS class loading deadlock situation were made in +<a href="https://issues.apache.org/jira/browse/ACCUMULO-4341";>ACCUMULO-4341</a>.</p> + +<h3 id="native-map-failed-to-increment-mutation-count-properly">Native Map failed to increment mutation count properly</h3> + +<p>There was a bug (<a href="https://issues.apache.org/jira/browse/ACCUMULO-4148";>ACCUMULO-4148</a>) where multiple put calls with +identical keys and no timestamp would exhibit different behaviour depending on +whether native maps were enabled or not. This behaviour would result in hidden +mutations with native maps, and has been corrected.</p> + +<h3 id="open-wal-files-could-prevent-datanode-decomission">Open WAL files could prevent DataNode decomission</h3> + +<p>An improvement was introduced to allow a max age before WAL files would be +automatically rolled. Without a max age, they could stay open for writing +indefinitely, blocking the Hadoop DataNode decomissioning process. For more +information, see <a href="https://issues.apache.org/jira/browse/ACCUMULO-4004";>ACCUMULO-4004</a>.</p> + +<h3 id="remove-unnecessary-copy-of-cached-rfile-index-blocks">Remove unnecessary copy of cached RFile index blocks</h3> + +<p>Accumulo maintains an cache for file blocks in-memory as a performance +optimization. This can be done safely because Accumulo RFiles are immutable, +thus their blocks are also immutable. There are two types of these blocks: +index and data blocks. Index blocks refer to the b-tree style index inside of +each Accumulo RFile, while data blocks contain the sorted Key-Value pairs. In +previous versions, when Accumulo extracted an Index block from the in-memory +cache, it would copy the data. <a href="https://issues.apache.org/jira/browse/ACCUMULO-4164";>ACCUMULO-4164</a> removes this +unnecessary copy as the contents are immutable and can be passed by reference. +Ensuring that the Index blocks are not copied when accessed from the cache is a +big performance gain at the file-access level.</p> + +<h3 id="analyze-key-length-to-avoid-choosing-large-keys-for-rfile-index-blocks">Analyze Key-length to avoid choosing large Keys for RFile Index blocks</h3> + +<p>Accumuloâs RFile index blocks are made up of a Key which exists in the file and +points to that specific location in the corresponding RFile data block. Thus, +the size of the RFile index blocks is largely dominated by the size of the Keys +which are used by the index. <a href="https://issues.apache.org/jira/browse/ACCUMULO-4314";>ACCUMULO-4314</a> is an improvement +which uses statistics on the length of the Keys in the Rfile to avoid choosing +Keys for the index whose length is greater than three standard deviations for +the RFile. By choosing smaller Keys for the index, Accumulo can access the +RFile index faster and keep more Index blocks cached in memory. Initial tests +showed that with this change, the RFile index size was nearly cut in half.</p> + +<h3 id="gson-version-bump">Gson version bump</h3> + +<p>Due to an <a href="https://github.com/google/gson/issues/362";>upstream bug with Gson 2.2.2</a>, weâve bumped our bundled +dependency (<a href="https://issues.apache.org/jira/browse/ACCUMULO-4345";>ACCUMULO-4345</a>) to version 2.2.4. Please take note +of this when you upgrade, if you were using the version shipped with Accumulo, +and were relying on the buggy behavior in the previous version in your own +code.</p> + +<h3 id="minor-performance-improvements">Minor performance improvements.</h3> + +<p>A performance issue was identified and corrected +(<a href="https://issues.apache.org/jira/browse/ACCUMULO-1755";>ACCUMULO-1755</a>) where the BatchWriter would block calls to +addMutation while looking up destination tablet server metadata. The writer has +been fixed to allow both operations in parallel.</p> + +<h2 id="other-notable-changes">Other Notable Changes</h2> + +<ul> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-4155";>ACCUMULO-4155</a> No longer publish javadoc for non-public API +to website. (Still available in javadoc jars in maven)</li> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-4334";>ACCUMULO-4334</a> Ingest rates reported through JMX did not +match rates reported by Monitor.</li> + <li><a href="https://issues.apache.org/jira/browse/ACCUMULO-4335";>ACCUMULO-4335</a> Error conditions that result in a Halt should +ensure non-zero process exit code.</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>CentOS 7</td> + <td>1.2.1</td> + <td>1</td> + <td>3.3.6</td> + <td>No</td> + <td>Unit tests and Integration Tests</td> + </tr> + <tr> + <td>CentOS 7</td> + <td>2.2.0</td> + <td>1</td> + <td>3.3.6</td> + <td>No</td> + <td>Unit tests and Integration Tests</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>
