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-<p>Complex event processing (CEP) addresses exactly this problem of matching continuously incoming events against a pattern. -The result of a matching are usually complex events which are derived from the input events. -In contrast to traditional DBMSs where a query is executed on stored data, CEP executes data on a stored query. -All data which is not relevant for the query can be immediately discarded. -The advantages of this approach are obvious, given that CEP queries are applied on a potentially infinite stream of data. -Furthermore, inputs are processed immediately. -Once the system has seen all events for a matching sequence, results are emitted straight away. -This aspect effectively leads to CEPâs real time analytics capability.</p> - -<p>Consequently, CEPâs processing paradigm drew significant interest and found application in a wide variety of use cases. -Most notably, CEP is used nowadays for financial applications such as stock market trend and credit card fraud detection. -Moreover, it is used in RFID-based tracking and monitoring, for example, to detect thefts in a warehouse where items are not properly checked out. -CEP can also be used to detect network intrusion by specifying patterns of suspicious user behaviour.</p> - -<p>Apache Flink with its true streaming nature and its capabilities for low latency as well as high throughput stream processing is a natural fit for CEP workloads. -Consequently, the Flink community has introduced the first version of a new <a href="https://ci.apache.org/projects/flink/flink-docs-master/apis/streaming/libs/cep.html";>CEP library</a> with <a href="http://flink.apache.org/news/2016/03/08/release-1.0.0.html";>Flink 1.0</a>. -In the remainder of this blog post, we introduce Flinkâs CEP library and we illustrate its ease of use through the example of monitoring a data center.</p> - -<h2 id="monitoring-and-alert-generation-for-data-centers">Monitoring and alert generation for data centers</h2> - -<center> -<img src="/img/blog/cep-monitoring.svg" style="width:600px;margin:15px" /> -</center> - -<p>Assume we have a data center with a number of racks. -For each rack the power consumption and the temperature are monitored. -Whenever such a measurement takes place, a new power or temperature event is generated, respectively. -Based on this monitoring event stream, we want to detect racks that are about to overheat, and dynamically adapt their workload and cooling.</p> - -<p>For this scenario we use a two staged approach. -First, we monitor the temperature events. -Whenever we see two consecutive events whose temperature exceeds a threshold value, we generate a temperature warning with the current average temperature. -A temperature warning does not necessarily indicate that a rack is about to overheat. -But whenever we see two consecutive warnings with increasing temperatures, then we want to issue an alert for this rack. -This alert can then lead to countermeasures to cool the rack.</p> - -<h3 id="implementation-with-apache-flink">Implementation with Apache Flink</h3> - -<p>First, we define the messages of the incoming monitoring event stream. -Every monitoring message contains its originating rack ID. -The temperature event additionally contains the current temperature and the power consumption event contains the current voltage. -We model the events as POJOs:</p> - -<div class="highlight"><pre><code class="language-java"><span class="kd">public</span> <span class="kd">abstract</span> <span class="kd">class</span> <span class="nc">MonitoringEvent</span> <span class="o">{</span> - <span class="kd">private</span> <span class="kt">int</span> <span class="n">rackID</span><span class="o">;</span> - <span class="o">...</span> -<span class="o">}</span> - -<span class="kd">public</span> <span class="kd">class</span> <span class="nc">TemperatureEvent</span> <span class="kd">extends</span> <span class="n">MonitoringEvent</span> <span class="o">{</span> - <span class="kd">private</span> <span class="kt">double</span> <span class="n">temperature</span><span class="o">;</span> - <span class="o">...</span> -<span class="o">}</span> - -<span class="kd">public</span> <span class="kd">class</span> <span class="nc">PowerEvent</span> <span class="kd">extends</span> <span class="n">MonitoringEvent</span> <span class="o">{</span> - <span class="kd">private</span> <span class="kt">double</span> <span class="n">voltage</span><span class="o">;</span> - <span class="o">...</span> -<span class="o">}</span></code></pre></div> - -<p>Now we can ingest the monitoring event stream using one of Flinkâs connectors (e.g. Kafka, RabbitMQ, etc.). -This will give us a <code>DataStream<MonitoringEvent> inputEventStream</code> which we will use as the input for Flinkâs CEP operator. -But first, we have to define the event pattern to detect temperature warnings. -The CEP library offers an intuitive <a href="https://ci.apache.org/projects/flink/flink-docs-master/apis/streaming/libs/cep.html#the-pattern-api";>Pattern API</a> to easily define these complex patterns.</p> - -<p>Every pattern consists of a sequence of events which can have optional filter conditions assigned. -A pattern always starts with a first event to which we will assign the name <code>âFirst Eventâ</code>.</p> - -<div class="highlight"><pre><code class="language-java"><span class="n">Pattern</span><span class="o">.<</span><span class="n">MonitoringEvent</span><span class="o">></span><span class="n">begin</span><span class="o">(</span><span class="s">"First Event"</span><span class="o">);</span></code></pre></div> - -<p>This pattern will match every monitoring event. -Since we are only interested in <code>TemperatureEvents</code> whose temperature is above a threshold value, we have to add an additional subtype constraint and a where clause:</p> - -<div class="highlight"><pre><code class="language-java"><span class="n">Pattern</span><span class="o">.<</span><span class="n">MonitoringEvent</span><span class="o">></span><span class="n">begin</span><span class="o">(</span><span class="s">"First Event"</span><span class="o">)</span> - <span class="o">.</span><span class="na">subtype</span><span class="o">(</span><span class="n">TemperatureEvent</span><span class="o">.</span><span class="na">class</span><span class="o">)</span> - <span class="o">.</span><span class="na">where</span><span class="o">(</span><span class="n">evt</span> <span class="o">-></span> <span class="n">evt</span><span class="o">.</span><span class="na">getTemperature</span><span class="o">()</span> <span class="o">>=</span> <span class="n">TEMPERATURE_THRESHOLD</span><span class="o">);</span></code></pre></div> - -<p>As stated before, we want to generate a <code>TemperatureWarning</code> if and only if we see two consecutive <code>TemperatureEvents</code> for the same rack whose temperatures are too high. -The Pattern API offers the <code>next</code> call which allows us to add a new event to our pattern. -This event has to follow directly the first matching event in order for the whole pattern to match.</p> - -<div class="highlight"><pre><code class="language-java"><span class="n">Pattern</span><span class="o"><</span><span class="n">MonitoringEvent</span><span class="o">,</span> <span class="o">?></span> <span class="n">warningPattern</span> <span class="o">=</span> <span class="n">Pattern</span><span class="o">.<</span><span class="n">MonitoringEvent</span><span class="o">></span><span class="n">begin</span><span class="o">(</span><span class="s">"First Event"</span><span class="o">)</span> - <span class="o">.</span><span class="na">subtype</span><span class="o">(</span><span class="n">TemperatureEvent</span><span class="o">.</span><span class="na">class</span><span class="o">)</span> - <span class="o">.</span><span class="na">where</span><span class="o">(</span><span class="n">evt</span> <span class="o">-></span> <span class="n">evt</span><span class="o">.</span><span class="na">getTemperature</span><span class="o">()</span> <span class="o">>=</span> <span class="n">TEMPERATURE_THRESHOLD</span><span class="o">)</span> - <span class="o">.</span><span class="na">next</span><span class="o">(</span><span class="s">"Second Event"</span><span class="o">)</span> - <span class="o">.</span><span class="na">subtype</span><span class="o">(</span><span class="n">TemperatureEvent</span><span class="o">.</span><span class="na">class</span><span class="o">)</span> - <span class="o">.</span><span class="na">where</span><span class="o">(</span><span class="n">evt</span> <span class="o">-></span> <span class="n">evt</span><span class="o">.</span><span class="na">getTemperature</span><span class="o">()</span> <span class="o">>=</span> <span class="n">TEMPERATURE_THRESHOLD</span><span class="o">)</span> - <span class="o">.</span><span class="na">within</span><span class="o">(</span><span class="n">Time</span><span class="o">.</span><span class="na">seconds</span><span class="o">(</span><span class="mi">10</span><span class="o">));</span></code></pre></div> - -<p>The final pattern definition also contains the <code>within</code> API call which defines that two consecutive <code>TemperatureEvents</code> have to occur within a time interval of 10 seconds for the pattern to match. -Depending on the time characteristic setting, this can either be processing, ingestion or event time.</p> - -<p>Having defined the event pattern, we can now apply it on the <code>inputEventStream</code>.</p> - -<div class="highlight"><pre><code class="language-java"><span class="n">PatternStream</span><span class="o"><</span><span class="n">MonitoringEvent</span><span class="o">></span> <span class="n">tempPatternStream</span> <span class="o">=</span> <span class="n">CEP</span><span class="o">.</span><span class="na">pattern</span><span class="o">(</span> - <span class="n">inputEventStream</span><span class="o">.</span><span class="na">keyBy</span><span class="o">(</span><span class="s">"rackID"</span><span class="o">),</span> - <span class="n">warningPattern</span><span class="o">);</span></code></pre></div> - -<p>Since we want to generate our warnings for each rack individually, we <code>keyBy</code> the input event stream by the <code>ârackIDâ</code> POJO field. -This enforces that matching events of our pattern will all have the same rack ID.</p> - -<p>The <code>PatternStream<MonitoringEvent></code> gives us access to successfully matched event sequences. -They can be accessed using the <code>select</code> API call. -The <code>select</code> API call takes a <code>PatternSelectFunction</code> which is called for every matching event sequence. -The event sequence is provided as a <code>Map<String, MonitoringEvent></code> where each <code>MonitoringEvent</code> is identified by its assigned event name. -Our pattern select function generates for each matching pattern a <code>TemperatureWarning</code> event.</p> - -<div class="highlight"><pre><code class="language-java"><span class="kd">public</span> <span class="kd">class</span> <span class="nc">TemperatureWarning</span> <span class="o">{</span> - <span class="kd">private</span> <span class="kt">int</span> <span class="n">rackID</span><span class="o">;</span> - <span class="kd">private</span> <span class="kt">double</span> <span class="n">averageTemperature</span><span class="o">;</span> - <span class="o">...</span> -<span class="o">}</span> - -<span class="n">DataStream</span><span class="o"><</span><span class="n">TemperatureWarning</span><span class="o">></span> <span class="n">warnings</span> <span class="o">=</span> <span class="n">tempPatternStream</span><span class="o">.</span><span class="na">select</span><span class="o">(</span> - <span class="o">(</span><span class="n">Map</span><span class="o"><</span><span class="n">String</span><span class="o">,</span> <span class="n">MonitoringEvent</span><span class="o">></span> <span class="n">pattern</span><span class="o">)</span> <span class="o">-></span> <span class="o">{</span> - <span class="n">TemperatureEvent</span> <span class="n">first</span> <span class="o">=</span> <span class="o">(</span><span class="n">TemperatureEvent</span><span class="o">)</span> <span class="n">pattern</span><span class="o">.</span><span class="na">get</span><span class="o">(</span><span class="s">"First Event"</span><span class="o">);</span> - <span class="n">TemperatureEvent</span> <span class="n">second</span> <span class="o">=</span> <span class="o">(</span><span class="n">TemperatureEvent</span><span class="o">)</span> <span class="n">pattern</span><span class="o">.</span><span class="na">get</span><span class="o">(</span><span class="s">"Second Event"</span><span class="o">);</span> - - <span class="k">return</span> <span class="k">new</span> <span class="nf">TemperatureWarning</span><span class="o">(</span> - <span class="n">first</span><span class="o">.</span><span class="na">getRackID</span><span class="o">(),</span> - <span class="o">(</span><span class="n">first</span><span class="o">.</span><span class="na">getTemperature</span><span class="o">()</span> <span class="o">+</span> <span class="n">second</span><span class="o">.</span><span class="na">getTemperature</span><span class="o">())</span> <span class="o">/</span> <span class="mi">2</span><span class="o">);</span> - <span class="o">}</span> -<span class="o">);</span></code></pre></div> - -<p>Now we have generated a new complex event stream <code>DataStream<TemperatureWarning> warnings</code> from the initial monitoring event stream. -This complex event stream can again be used as the input for another round of complex event processing. -We use the <code>TemperatureWarnings</code> to generate <code>TemperatureAlerts</code> whenever we see two consecutive <code>TemperatureWarnings</code> for the same rack with increasing temperatures. -The <code>TemperatureAlerts</code> have the following definition:</p> - -<div class="highlight"><pre><code class="language-java"><span class="kd">public</span> <span class="kd">class</span> <span class="nc">TemperatureAlert</span> <span class="o">{</span> - <span class="kd">private</span> <span class="kt">int</span> <span class="n">rackID</span><span class="o">;</span> - <span class="o">...</span> -<span class="o">}</span></code></pre></div> - -<p>At first, we have to define our alert event pattern:</p> - -<div class="highlight"><pre><code class="language-java"><span class="n">Pattern</span><span class="o"><</span><span class="n">TemperatureWarning</span><span class="o">,</span> <span class="o">?></span> <span class="n">alertPattern</span> <span class="o">=</span> <span class="n">Pattern</span><span class="o">.<</span><span class="n">TemperatureWarning</span><span class="o">></span><span class="n">begin</span><span class="o">(</span><span class="s">"First Event"</span><span class="o">)</span> - <span class="o">.</span><span class="na">next</span><span class="o">(</span><span class="s">"Second Event"</span><span class="o">)</span> - <span class="o">.</span><span class="na">within</span><span class="o">(</span><span class="n">Time</span><span class="o">.</span><span class="na">seconds</span><span class="o">(</span><span class="mi">20</span><span class="o">));</span></code></pre></div> - -<p>This definition says that we want to see two <code>TemperatureWarnings</code> within 20 seconds. -The first event has the name <code>âFirst Eventâ</code> and the second consecutive event has the name <code>âSecond Eventâ</code>. -The individual events donât have a where clause assigned, because we need access to both events in order to decide whether the temperature is increasing. -Therefore, we apply the filter condition in the select clause. -But first, we obtain again a <code>PatternStream</code>.</p> - -<div class="highlight"><pre><code class="language-java"><span class="n">PatternStream</span><span class="o"><</span><span class="n">TemperatureWarning</span><span class="o">></span> <span class="n">alertPatternStream</span> <span class="o">=</span> <span class="n">CEP</span><span class="o">.</span><span class="na">pattern</span><span class="o">(</span> - <span class="n">warnings</span><span class="o">.</span><span class="na">keyBy</span><span class="o">(</span><span class="s">"rackID"</span><span class="o">),</span> - <span class="n">alertPattern</span><span class="o">);</span></code></pre></div> - -<p>Again, we <code>keyBy</code> the warnings input stream by the <code>"rackID"</code> so that we generate our alerts for each rack individually. -Next we apply the <code>flatSelect</code> method which will give us access to matching event sequences and allows us to output an arbitrary number of complex events. -Thus, we will only generate a <code>TemperatureAlert</code> if and only if the temperature is increasing.</p> - -<div class="highlight"><pre><code class="language-java"><span class="n">DataStream</span><span class="o"><</span><span class="n">TemperatureAlert</span><span class="o">></span> <span class="n">alerts</span> <span class="o">=</span> <span class="n">alertPatternStream</span><span class="o">.</span><span class="na">flatSelect</span><span class="o">(</span> - <span class="o">(</span><span class="n">Map</span><span class="o"><</span><span class="n">String</span><span class="o">,</span> <span class="n">TemperatureWarning</span><span class="o">></span> <span class="n">pattern</span><span class="o">,</span> <span class="n">Collector</span><span class="o"><</span><span class="n">TemperatureAlert</span><span class="o">></span> <span class="n">out</span><span class="o">)</span> <span class="o">-></span> <span class="o">{</span> - <span class="n">TemperatureWarning</span> <span class="n">first</span> <span class="o">=</span> <span class="n">pattern</span><span class="o">.</span><span class="na">get</span><span class="o">(</span><span class="s">"First Event"</span><span class="o">);</span> - <span class="n">TemperatureWarning</span> <span class="n">second</span> <span class="o">=</span> <span class="n">pattern</span><span class="o">.</span><span class="na">get</span><span class="o">(</span><span class="s">"Second Event"</span><span class="o">);</span> - - <span class="k">if</span> <span class="o">(</span><span class="n">first</span><span class="o">.</span><span class="na">getAverageTemperature</span><span class="o">()</span> <span class="o"><</span> <span class="n">second</span><span class="o">.</span><span class="na">getAverageTemperature</span><span class="o">())</span> <span class="o">{</span> - <span class="n">out</span><span class="o">.</span><span class="na">collect</span><span class="o">(</span><span class="k">new</span> <span class="nf">TemperatureAlert</span><span class="o">(</span><span class="n">first</span><span class="o">.</span><span class="na">getRackID</span><span class="o">()));</span> - <span class="o">}</span> - <span class="o">});</span></code></pre></div> - -<p>The <code>DataStream<TemperatureAlert> alerts</code> is the data stream of temperature alerts for each rack. -Based on these alerts we can now adapt the workload or cooling for overheating racks.</p> - -<p>The full source code for the presented example as well as an example data source which generates randomly monitoring events can be found in <a href="https://github.com/tillrohrmann/cep-monitoring";>this repository</a>.</p> - -<h2 id="conclusion">Conclusion</h2> - -<p>In this blog post we have seen how easy it is to reason about event streams using Flinkâs CEP library. -Using the example of monitoring and alert generation for a data center, we have implemented a short program which notifies us when a rack is about to overheat and potentially to fail.</p> - -<p>In the future, the Flink community will further extend the CEP libraryâs functionality and expressiveness. -Next on the road map is support for a regular expression-like pattern specification, including Kleene star, lower and upper bounds, and negation. -Furthermore, it is planned to allow the where-clause to access fields of previously matched events. -This feature will allow to prune unpromising event sequences early.</p> - 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You can find the binaries on the updated <a href="/downloads.html">Downloads page</a>.</p> - -<h2 id="fixed-issues">Fixed Issues</h2> - -<h3>Bug</h3> -<ul> -<li>[<a href="https://issues.apache.org/jira/browse/FLINK-3179";>FLINK-3179</a>] - Combiner is not injected if Reduce or GroupReduce input is explicitly partitioned -</li> -<li>[<a href="https://issues.apache.org/jira/browse/FLINK-3472";>FLINK-3472</a>] - JDBCInputFormat.nextRecord(..) has misleading message on NPE -</li> -<li>[<a href="https://issues.apache.org/jira/browse/FLINK-3491";>FLINK-3491</a>] - HDFSCopyUtilitiesTest fails on Windows -</li> -<li>[<a href="https://issues.apache.org/jira/browse/FLINK-3495";>FLINK-3495</a>] - RocksDB Tests can't run on Windows -</li> -<li>[<a href="https://issues.apache.org/jira/browse/FLINK-3533";>FLINK-3533</a>] - Update the Gelly docs wrt examples and cluster execution -</li> -<li>[<a href="https://issues.apache.org/jira/browse/FLINK-3563";>FLINK-3563</a>] - .returns() doesn't compile when using .map() with a custom MapFunction -</li> -<li>[<a href="https://issues.apache.org/jira/browse/FLINK-3566";>FLINK-3566</a>] - Input type validation often fails on custom TypeInfo implementations -</li> -<li>[<a href="https://issues.apache.org/jira/browse/FLINK-3578";>FLINK-3578</a>] - Scala DataStream API does not support Rich Window Functions -</li> -<li>[<a href="https://issues.apache.org/jira/browse/FLINK-3595";>FLINK-3595</a>] - Kafka09 consumer thread does not interrupt when stuck in record emission -</li> -<li>[<a href="https://issues.apache.org/jira/browse/FLINK-3602";>FLINK-3602</a>] - Recursive Types are not supported / crash TypeExtractor -</li> -<li>[<a href="https://issues.apache.org/jira/browse/FLINK-3621";>FLINK-3621</a>] - Misleading documentation of memory configuration parameters -</li> -<li>[<a href="https://issues.apache.org/jira/browse/FLINK-3629";>FLINK-3629</a>] - In wikiedits Quick Start example, "The first call, .window()" should be "The first call, .timeWindow()" -</li> -<li>[<a href="https://issues.apache.org/jira/browse/FLINK-3651";>FLINK-3651</a>] - Fix faulty RollingSink Restore -</li> -<li>[<a href="https://issues.apache.org/jira/browse/FLINK-3653";>FLINK-3653</a>] - recovery.zookeeper.storageDir is not documented on the configuration page -</li> -<li>[<a href="https://issues.apache.org/jira/browse/FLINK-3663";>FLINK-3663</a>] - FlinkKafkaConsumerBase.logPartitionInfo is missing a log marker -</li> -<li>[<a href="https://issues.apache.org/jira/browse/FLINK-3681";>FLINK-3681</a>] - CEP library does not support Java 8 lambdas as select function -</li> -<li>[<a href="https://issues.apache.org/jira/browse/FLINK-3682";>FLINK-3682</a>] - CEP operator does not set the processing timestamp correctly -</li> -<li>[<a href="https://issues.apache.org/jira/browse/FLINK-3684";>FLINK-3684</a>] - CEP operator does not forward watermarks properly -</li> -</ul> - -<h3>Improvement</h3> -<ul> -<li>[<a href="https://issues.apache.org/jira/browse/FLINK-3570";>FLINK-3570</a>] - Replace random NIC selection heuristic by InetAddress.getLocalHost -</li> -<li>[<a href="https://issues.apache.org/jira/browse/FLINK-3575";>FLINK-3575</a>] - Update Working With State Section in Doc -</li> -<li>[<a href="https://issues.apache.org/jira/browse/FLINK-3591";>FLINK-3591</a>] - Replace Quickstart K-Means Example by Streaming Example -</li> -</ul> - -<h2>Test</h2> -<ul> -<li>[<a href="https://issues.apache.org/jira/browse/FLINK-2444";>FLINK-2444</a>] - Add tests for HadoopInputFormats -</li> -<li>[<a href="https://issues.apache.org/jira/browse/FLINK-2445";>FLINK-2445</a>] - Add tests for HadoopOutputFormats -</li> -</ul> - - </article> - </div> - - <div class="row"> - <div id="disqus_thread"></div> - <script type="text/javascript"> - /* * * CONFIGURATION VARIABLES: EDIT BEFORE PASTING INTO YOUR WEBPAGE * * */ - var disqus_shortname = 'stratosphere-eu'; // required: replace example with your forum shortname - - /* * * DON'T EDIT BELOW THIS LINE * * */ - (function() { - var dsq = document.createElement('script'); dsq.type = 'text/javascript'; dsq.async = true; - dsq.src = '//' + disqus_shortname + '.disqus.com/embed.js'; - (document.getElementsByTagName('head')[0] || document.getElementsByTagName('body')[0]).appendChild(dsq); - })(); - </script> - </div> - </div> -</div> - - <hr /> - <div class="footer text-center"> - <p>Copyright © 2014-2016 <a href="http://apache.org";>The Apache Software Foundation</a>. 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The conference will take place September 12-14, 2016 in Berlin, Germany, bringing together the open source stream processing community. Most Apache Flink committers will attend the conference, making it the ideal venue to learn more about the project and its roadmap and connect with the community.</p> - -<p>The conference welcomes submissions on everything Flink-related, including experiences with using Flink, products based on Flink, technical talks on extending Flink, as well as connecting Flink with other open source or proprietary software.</p> - -<p>Read more <a href="http://flink-forward.org/";>here</a>.</p> - - </article> - </div> - - <div class="row"> - <div id="disqus_thread"></div> - <script type="text/javascript"> - /* * * CONFIGURATION VARIABLES: EDIT BEFORE PASTING INTO YOUR WEBPAGE * * */ - var disqus_shortname = 'stratosphere-eu'; // required: replace example with your forum shortname - - /* * * DON'T EDIT BELOW THIS LINE * * */ - (function() { - var dsq = document.createElement('script'); dsq.type = 'text/javascript'; dsq.async = true; - dsq.src = '//' + disqus_shortname + '.disqus.com/embed.js'; - (document.getElementsByTagName('head')[0] || document.getElementsByTagName('body')[0]).appendChild(dsq); - })(); - </script> - </div> - </div> -</div> - - <hr /> - <div class="footer text-center"> - <p>Copyright © 2014-2016 <a href="http://apache.org";>The Apache Software Foundation</a>. 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You can find the binaries on the updated <a href="/downloads.html">Downloads page</a>.</p> - -<h2 id="fixed-issues">Fixed Issues</h2> - -<h3 id="bug">Bug</h3> - -<ul> - <li>[<a href="https://issues.apache.org/jira/browse/FLINK-3657";>FLINK-3657</a>] [dataSet] Change access of DataSetUtils.countElements() to âpublicâ</li> - <li>[<a href="https://issues.apache.org/jira/browse/FLINK-3762";>FLINK-3762</a>] [core] Enable Kryo reference tracking</li> - <li>[<a href="https://issues.apache.org/jira/browse/FLINK-3732";>FLINK-3732</a>] [core] Fix potential null deference in ExecutionConfig#equals()</li> - <li>[<a href="https://issues.apache.org/jira/browse/FLINK-3760";>FLINK-3760</a>] Fix StateDescriptor.readObject</li> - <li>[<a href="https://issues.apache.org/jira/browse/FLINK-3730";>FLINK-3730</a>] Fix RocksDB Local Directory Initialization</li> - <li>[<a href="https://issues.apache.org/jira/browse/FLINK-3712";>FLINK-3712</a>] Make all dynamic properties available to the CLI frontend</li> - <li>[<a href="https://issues.apache.org/jira/browse/FLINK-3688";>FLINK-3688</a>] WindowOperator.trigger() does not emit Watermark anymore</li> - <li>[<a href="https://issues.apache.org/jira/browse/FLINK-3697";>FLINK-3697</a>] Properly access type information for nested POJO key selection</li> -</ul> - -<h3 id="improvement">Improvement</h3> - -<ul> - <li>[<a href="https://issues.apache.org/jira/browse/FLINK-3654";>FLINK-3654</a>] Disable Write-Ahead-Log in RocksDB State</li> -</ul> - -<h3 id="docs">Docs</h3> -<ul> - <li>[<a href="https://issues.apache.org/jira/browse/FLINK-2544";>FLINK-2544</a>] [docs] Add Java 8 version for building PowerMock tests to docs</li> - <li>[<a href="https://issues.apache.org/jira/browse/FLINK-3469";>FLINK-3469</a>] [docs] Improve documentation for grouping keys</li> - <li>[<a href="https://issues.apache.org/jira/browse/FLINK-3634";>FLINK-3634</a>] [docs] Fix documentation for DataSetUtils.zipWithUniqueId()</li> - <li>[<a href="https://issues.apache.org/jira/browse/FLINK-3711";>FLINK-3711</a>][docs] Documentation of Scala fold()() uses correct syntax</li> -</ul> - -<h3 id="tests">Tests</h3> - -<ul> - <li>[<a href="https://issues.apache.org/jira/browse/FLINK-3716";>FLINK-3716</a>] [kafka consumer] Decreasing socket timeout so testFailOnNoBroker() will pass before JUnit timeout</li> -</ul> - - </article> - </div> - - <div class="row"> - <div id="disqus_thread"></div> - <script type="text/javascript"> - /* * * CONFIGURATION VARIABLES: EDIT BEFORE PASTING INTO YOUR WEBPAGE * * */ - var disqus_shortname = 'stratosphere-eu'; // required: replace example with your forum shortname - - /* * * DON'T EDIT BELOW THIS LINE * * */ - (function() { - var dsq = document.createElement('script'); dsq.type = 'text/javascript'; dsq.async = true; - dsq.src = '//' + disqus_shortname + '.disqus.com/embed.js'; - (document.getElementsByTagName('head')[0] || document.getElementsByTagName('body')[0]).appendChild(dsq); - })(); - </script> - </div> - </div> -</div> - - <hr /> - <div class="footer text-center"> - <p>Copyright © 2014-2016 <a href="http://apache.org";>The Apache Software Foundation</a>. 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You can find the binaries on the updated <a href="/downloads.html">Downloads page</a>.</p> - -<h2 id="fixed-issues">Fixed Issues</h2> - -<h3 id="bug">Bug</h3> - -<ul> - <li>[<a href="https://issues.apache.org/jira/browse/FLINK-3790";>FLINK-3790</a>] [streaming] Use proper hadoop config in rolling sink</li> - <li>[<a href="https://issues.apache.org/jira/browse/FLINK-3840";>FLINK-3840</a>] Remove Testing Files in RocksDB Backend</li> - <li>[<a href="https://issues.apache.org/jira/browse/FLINK-3835";>FLINK-3835</a>] [optimizer] Add input id to JSON plan to resolve ambiguous input names</li> - <li>[hotfix] OptionSerializer.duplicate to respect stateful element serializer</li> - <li>[<a href="https://issues.apache.org/jira/browse/FLINK-3803";>FLINK-3803</a>] [runtime] Pass CheckpointStatsTracker to ExecutionGraph</li> - <li>[hotfix] [cep] Make cep window border treatment consistent</li> -</ul> - -<h3 id="improvement">Improvement</h3> - -<ul> - <li>[<a href="https://issues.apache.org/jira/browse/FLINK-3678";>FLINK-3678</a>] [dist, docs] Make Flink logs directory configurable</li> -</ul> - -<h3 id="docs">Docs</h3> - -<ul> - <li>[docs] Add note about S3AFileSystem âbuffer.dirâ property</li> - <li>[docs] Update AWS S3 docs</li> -</ul> - -<h3 id="tests">Tests</h3> - -<ul> - <li>[<a href="https://issues.apache.org/jira/browse/FLINK-3860";>FLINK-3860</a>] [connector-wikiedits] Add retry loop to WikipediaEditsSourceTest</li> - <li>[streaming-contrib] Fix port clash in DbStateBackend tests</li> -</ul> - - </article> - </div> - - <div class="row"> - <div id="disqus_thread"></div> - <script type="text/javascript"> - /* * * CONFIGURATION VARIABLES: EDIT BEFORE PASTING INTO YOUR WEBPAGE * * */ - var disqus_shortname = 'stratosphere-eu'; // required: replace example with your forum shortname - - /* * * DON'T EDIT BELOW THIS LINE * * */ - (function() { - var dsq = document.createElement('script'); dsq.type = 'text/javascript'; dsq.async = true; - dsq.src = '//' + disqus_shortname + '.disqus.com/embed.js'; - (document.getElementsByTagName('head')[0] || document.getElementsByTagName('body')[0]).appendChild(dsq); - })(); - </script> - </div> - </div> -</div> - - <hr /> - <div class="footer text-center"> - <p>Copyright © 2014-2016 <a href="http://apache.org";>The Apache Software Foundation</a>. 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