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Posted to commits@accumulo.apache.org by bu...@apache.org on 2015/05/13 00:08:25 UTC
svn commit: r951087 - in /websites/staging/accumulo/trunk/content: ./
release_notes/1.7.0.html
Author: buildbot
Date: Tue May 12 22:08:25 2015
New Revision: 951087
Log:
Staging update by buildbot for accumulo
Added:
websites/staging/accumulo/trunk/content/release_notes/1.7.0.html
Modified:
websites/staging/accumulo/trunk/content/ (props changed)
Propchange: websites/staging/accumulo/trunk/content/
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Added: websites/staging/accumulo/trunk/content/release_notes/1.7.0.html
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--- websites/staging/accumulo/trunk/content/release_notes/1.7.0.html (added)
+++ websites/staging/accumulo/trunk/content/release_notes/1.7.0.html Tue May 12 22:08:25 2015
@@ -0,0 +1,381 @@
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+
+ <h1 class="title">Apache Accumulo 1.6.2 Release Notes</h1>
+
+ <p>Apache Accumulo 1.6.2 is a maintenance release on the 1.6 version branch.
+This release contains changes from over 150 issues, comprised of bug-fixes, performance
+improvements and better test cases. Apache Accumulo 1.6.2 is the first release since the
+community has adopted <a href="http://semver.org">Semantic Versioning</a> which means that all changes to the <a href="https://github.com/apache/accumulo#api">public API</a>
+are guaranteed to be made without adding to or removing from the public API. This ensures
+that client code that runs against 1.6.1 is guaranteed to run against 1.6.2 and vice versa.</p>
+<p>Users of 1.6.0 or 1.6.1 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 1.6
+are seeking to upgrade to 1.6 should consider 1.6.2 the starting point over 1.6.0 or 1.6.1. For
+information about improvements since Accumulo 1.5, see the <a href="http://accumulo.apache.org/release_notes/1.6.0.html">1.6.0</a> and <a href="http://accumulo.apache.org/release_notes/1.6.1.html">1.6.1</a> release notes.</p>
+<h2 id="notable-bug-fixes">Notable Bug Fixes</h2>
+<h3 id="only-first-zookeeper-server-is-used">Only first ZooKeeper server is used</h3>
+<p>In constructing a <code>ZooKeeperInstance</code>, the user provides a comma-separated list of addresses for ZooKeeper
+servers. 1.6.0 and 1.6.1 incorrectly truncated the provided list of ZooKeeper servers used to the first. This
+would cause clients to fail when the first ZooKeeper server in the list became unavailable and not properly
+load balance requests to all available servers in the quorum. <a href="https://issues.apache.org/jira/browse/ACCUMULO-3218">ACCUMULO-3218</a> fixes the parsing of
+the ZooKeeper quorum list to use all servers, not just the first.</p>
+<h3 id="incorrectly-handled-zookeeper-exception">Incorrectly handled ZooKeeper exception</h3>
+<p>Use of ZooKeeper's API requires very careful exception handling as some thrown exceptions from the ZooKeeper
+API are considered "normal" and must be retried by the client. In 1.6.1, Accumulo improved its handling of
+these "expected failures" to better insulate calls to ZooKeeper; however, the wrapper which sets data to a ZNode
+incorrectly handled all cases. <a href="https://issues.apache.org/jira/browse/ACCUMULO-3448">ACCUMULO-3448</a> fixed the implementation of <code>ZooUtil.putData(...)</code> to handle
+the expected error conditions correctly.</p>
+<h3 id="scanid-is-not-set-in-activescan"><code>scanId</code> is not set in <code>ActiveScan</code></h3>
+<p>The <code>ActiveScan</code> class is the returned object by <code>InstanceOperations.listScans</code>. This class represents a
+"scan" running on Accumulo servers, either from a <code>Scanner</code> or <code>BatchScanner</code>. The <code>ActiveScan</code> class
+is meant to represent all of the information that represents the scan and can be useful to administrators
+or DevOps-types to observe and act on scans which are running for excessive periods of time. <a href="https://issues.apache.org/jira/browse/ACCUMULO-2641">ACCUMULO-2641</a>
+fixes <code>ActiveScan</code> to ensure that the internal identifier <code>scanId</code> is properly set.</p>
+<h3 id="table-state-change-doesnt-wait-when-requested">Table state change doesn't wait when requested</h3>
+<p>An Accumulo table has two states: <code>ONLINE</code> and <code>OFFLINE</code>. An offline table in Accumulo consumes no TabletServer
+resources, only HDFS resources, which makes it useful to save infrequently used data. The Accumulo methods provided
+to transition a state from <code>ONLINE</code> to <code>OFFLINE</code> and vice versa did not respect the <code>wait=true</code> parameter
+when set. <a href="https://issues.apache.org/jira/browse/ACCUMULO-3301">ACCUMULO-3301</a> fixes the underlying implementation to ensure that when <code>wait=true</code> is provided,
+the method will not return until the table's state transition has fully completed.</p>
+<h3 id="keyvalue-doesnt-implement-hashcode-or-equals">KeyValue doesn't implement <code>hashCode()</code> or <code>equals()</code></h3>
+<p>The <code>KeyValue</code> class is an implementation of <code>Entry<Key,Value></code> which is returned by the classes like
+<code>Scanner</code> and <code>BatchScanner</code>. <a href="https://issues.apache.org/jira/browse/ACCUMULO-3217">ACCUMULO-3217</a> adds these methods which ensure that the returned <code>Entry<Key,Value></code>
+operates as expected with <code>HashMaps</code> and <code>HashSets</code>. </p>
+<h3 id="potential-deadlock-in-tabletserver">Potential deadlock in TabletServer</h3>
+<p>Internal to the TabletServer, there are methods to construct instances of configuration objects for tables
+and namespaces. The locking on these methods was not correctly implemented which created the possibility to
+have concurrent requests to a TabletServer to deadlock. <a href="https://issues.apache.org/jira/browse/ACCUMULO-3372">ACCUMULO-3372</a> found this problem while performing
+bulk imports of RFiles into Accumulo. Additional synchronization was added server-side to prevent this deadlock
+from happening in the future.</p>
+<h3 id="the-datelexicoder-incorrectly-serialized-dates-prior-1970">The <code>DateLexicoder</code> incorrectly serialized <code>Dates</code> prior 1970</h3>
+<p>The <code>DateLexicode</code>, a part of the <code>Lexicoders</code> classes which implement methods to convert common type primitives
+into lexicographically sorting Strings/bytes, incorrectly converted <code>Date</code> objects for dates prior to 1970.
+<a href="https://issues.apache.org/jira/browse/ACCUMULO-3385">ACCUMULO-3385</a> fixed the <code>DateLexicoder</code> to correctly (de)serialize data <code>Date</code> objects. For users with
+data stored in Accumulo using the broken implementation, the following can be performed to read the old data.</p>
+<div class="codehilite"><pre> <span class="n">Lexicoder</span> <span class="n">lex</span> <span class="p">=</span> <span class="n">new</span> <span class="n">ULongLexicoder</span><span class="p">();</span>
+ <span class="k">for</span> <span class="p">(</span><span class="n">Entry</span><span class="o"><</span><span class="n">Key</span><span class="p">,</span> <span class="n">Value</span><span class="o">></span> <span class="n">e</span> <span class="p">:</span> <span class="n">scanner</span><span class="p">)</span> <span class="p">{</span>
+ <span class="n">Date</span> <span class="n">d</span> <span class="p">=</span> <span class="n">new</span> <span class="n">Date</span><span class="p">(</span><span class="n">lex</span><span class="p">.</span><span class="n">decode</span><span class="p">(</span><span class="n">TextUtil</span><span class="p">.</span><span class="n">getBytes</span><span class="p">(</span><span class="n">e</span><span class="p">.</span><span class="n">getKey</span><span class="p">().</span><span class="n">getRow</span><span class="p">())));</span>
+ <span class="o">//</span> <span class="p">...</span>
+ <span class="p">}</span>
+</pre></div>
+
+
+<h3 id="reduce-miniaccumulocluster-failures-due-to-random-port-allocations">Reduce MiniAccumuloCluster failures due to random port allocations</h3>
+<p><code>MiniAccumuloCluster</code> has had issues where it fails to properly start due to the way it attempts to choose
+a random, unbound port on the local machine to start the ZooKeeper and Accumulo processes. Improvements have
+been made, including retry logic, to withstand a few failed port choices. The changes made by <a href="https://issues.apache.org/jira/browse/ACCUMULO-3233">ACCUMULO-3233</a>
+and the related issues should eliminate sporadic failures users of <code>MiniAccumuloCluster</code> might have observed.</p>
+<h3 id="tracer-doesnt-handle-trace-table-state-transition">Tracer doesn't handle trace table state transition</h3>
+<p>The Tracer is an optional Accumulo server process that serializes Spans, elements of a distributed trace,
+to the trace table for later inspection and correlation with other Spans. By default, the Tracer writes
+to a "trace" table. In earlier versions of Accumulo, if this table was put offline, the Tracer would fail
+to write new Spans to the table when it came back online. <a href="https://issues.apache.org/jira/browse/ACCUMULO-3351">ACCUMULO-3351</a> ensures that the Tracer process
+will resume writing Spans to the trace table when it transitions to online after being offline.</p>
+<h3 id="tablet-not-major-compacting">Tablet not major compacting</h3>
+<p>It was noticed that a system performing many bulk imports, there was a tablet with hundreds of files which
+was not major compacting nor was scheduled to be major compacted. <a href="https://issues.apache.org/jira/browse/ACCUMULO-3462">ACCUMULO-3462</a> identified as fix
+server-side which would prevent this from happening in the future.</p>
+<h3 id="yarn-job-submission-fails-with-hadoop-260">YARN job submission fails with Hadoop-2.6.0</h3>
+<p>Hadoop 2.6.0 introduced a new component, the TimelineServer, which is a centralized metrics service designed
+for other Hadoop components to leverage. MapReduce jobs submitted via <code>accumulo</code> and <code>tool.sh</code> failed to
+run the job because it attempted to contact the TimelineServer and Accumulo was missing a dependency on
+the classpath to communicate with the TimelineServer. <a href="https://issues.apache.org/jira/browse/ACCUMULO-3230">ACCUMULO-3230</a> updates the classpath in the example
+configuration files to include the necessary dependencies for the TimelineServer to ensure that YARN job
+submission operates as previously.</p>
+<h2 id="performance-improvements">Performance Improvements</h2>
+<h3 id="user-scans-can-block-root-and-metadata-table-scans">User scans can block root and metadata table scans</h3>
+<p>The TabletServer provides a feature to limit the number of open files as a resource management configuration.
+To perform a scan against a normal table, the metadata and root table, when not cached, need to be consulted
+first. With a sufficient number of concurrent scans against normal tables, adding to the open file count,
+scans against the metadata and root tables could be blocked from running because no files can be opened.
+This prevents other system operations from happening as expected. <a href="https://issues.apache.org/jira/browse/ACCUMULO-3297">ACCUMULO-3297</a> fixes the internal semaphore
+used to implement this resource management to ensure that root and metadata table scans can proceed.</p>
+<h2 id="other-improvements">Other improvements</h2>
+<h3 id="limit-available-ciphers-for-ssltls">Limit available ciphers for SSL/TLS</h3>
+<p>Since Apache Accumulo 1.5.2 and 1.6.1, the <a href="http://en.wikipedia.org/wiki/POODLE">POODLE</a> man-in-the-middle attack was found which exploits a client's
+ability to fallback to the SSLv3.0 protocol. The main mitigation strategy was to prevent the use of old ciphers/protocols
+when using SSL connectors. In Accumulo, both the Apache Thrift RPC servers and Jetty server for the Accumulo
+monitor have the ability to enable SSL. <a href="https://issues.apache.org/jira/browse/ACCUMULO-3316">ACCUMULO-3316</a> is the parent issue which provides new configuration
+properties in accumulo-site.xml which can limit the accepted ciphers/protocols. By default, insecure or out-dated
+protocols have been removed from the default set in order to protect users by default.</p>
+<h2 id="documentation">Documentation</h2>
+<p>Documentation was added to the Administration chapter for moving from a Non-HA Namenode setup to an HA Namenode setup.
+New chapters were added for the configuration of SSL and for summaries of Implementation Details (initially describing
+FATE operations). A section was added to the Configuration chapter for describing how to arrive at optimal settings
+for configuring an instance with native maps.</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.
+<table id="release_notes_testing">
+ <tr>
+ <th>OS</th>
+ <th>Hadoop</th>
+ <th>Nodes</th>
+ <th>ZooKeeper</th>
+ <th>HDFS High-Availability</th>
+ <th>Tests</th>
+ </tr>
+ <tr>
+ <td>Gentoo</tdt>
+ <td>N/A</td>
+ <td>1</td>
+ <td>N/A</td>
+ <td>No</td>
+ <td>Unit and Integration Tests</td>
+ </tr>
+ <tr>
+ <td>Mac OSX</tdt>
+ <td>N/A</td>
+ <td>1</td>
+ <td>N/A</td>
+ <td>No</td>
+ <td>Unit and Integration Tests</td>
+ </tr>
+ <tr>
+ <td>Fedora 21</tdt>
+ <td>N/A</td>
+ <td>1</td>
+ <td>N/A</td>
+ <td>No</td>
+ <td>Unit and Integration Tests</td>
+ </tr>
+ <tr>
+ <td>CentOS 6</td>
+ <td>2.6</td>
+ <td>20</td>
+ <td>3.4.5</td>
+ <td>No</td>
+ <td>ContinuousIngest w/ verification w/ and w/o agitation (31B and 21B entries, respectively)</td>
+ </tr>
+</table></p>
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