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| <div class="subTitle">org.apache.kafka.streams.kstream</div> |
| <h2 title="Interface TimeWindowedCogroupedKStream" class="title">Interface TimeWindowedCogroupedKStream<K,V></h2> |
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| <div class="contentContainer"> |
| <div class="description"> |
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| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>K</code> - Type of keys</dd> |
| <dd><code>V</code> - Type of values</dd> |
| </dl> |
| <hr> |
| <br> |
| <pre>public interface <span class="typeNameLabel">TimeWindowedCogroupedKStream<K,V></span></pre> |
| <div class="block"><code>TimeWindowedCogroupKStream</code> is an abstraction of a <i>windowed</i> record stream of <a href="../../../../../org/apache/kafka/streams/KeyValue.html" title="class in org.apache.kafka.streams"><code>KeyValue</code></a> pairs. |
| It is an intermediate representation of a <a href="../../../../../org/apache/kafka/streams/kstream/CogroupedKStream.html" title="interface in org.apache.kafka.streams.kstream"><code>CogroupedKStream</code></a> in order to apply a windowed aggregation operation |
| on the original <a href="../../../../../org/apache/kafka/streams/kstream/KGroupedStream.html" title="interface in org.apache.kafka.streams.kstream"><code>KGroupedStream</code></a> records resulting in a windowed <a href="../../../../../org/apache/kafka/streams/kstream/KTable.html" title="interface in org.apache.kafka.streams.kstream"><code>KTable</code></a> (a <emph>windowed</emph> |
| <code>KTable</code> is a <a href="../../../../../org/apache/kafka/streams/kstream/KTable.html" title="interface in org.apache.kafka.streams.kstream"><code>KTable</code></a> with key type <a href="../../../../../org/apache/kafka/streams/kstream/Windowed.html" title="class in org.apache.kafka.streams.kstream"><code>Windowed<K></code></a>). |
| <p> |
| The specified <code>windows</code> define either hopping time windows that can be overlapping or tumbling (c.f. |
| <a href="../../../../../org/apache/kafka/streams/kstream/TimeWindows.html" title="class in org.apache.kafka.streams.kstream"><code>TimeWindows</code></a>) or they define landmark windows (c.f. <a href="../../../../../org/apache/kafka/streams/kstream/UnlimitedWindows.html" title="class in org.apache.kafka.streams.kstream"><code>UnlimitedWindows</code></a>). |
| <p> |
| The result is written into a local <a href="../../../../../org/apache/kafka/streams/state/WindowStore.html" title="interface in org.apache.kafka.streams.state"><code>WindowStore</code></a> (which is basically an ever-updating |
| materialized view) that can be queried using the name provided in the <a href="../../../../../org/apache/kafka/streams/kstream/Materialized.html" title="class in org.apache.kafka.streams.kstream"><code>Materialized</code></a> instance. |
| Furthermore, updates to the store are sent downstream into a windowed <a href="../../../../../org/apache/kafka/streams/kstream/KTable.html" title="interface in org.apache.kafka.streams.kstream"><code>KTable</code></a> changelog stream, where |
| "windowed" implies that the <a href="../../../../../org/apache/kafka/streams/kstream/KTable.html" title="interface in org.apache.kafka.streams.kstream"><code>KTable</code></a> key is a combined key of the original record key and a window ID. |
| New events are added to windows until their grace period ends (see <a href="../../../../../org/apache/kafka/streams/kstream/TimeWindows.html#grace-java.time.Duration-"><code>TimeWindows.grace(Duration)</code></a>). |
| <p> |
| A <code>TimeWindowedCogroupedKStream</code> must be obtained from a <a href="../../../../../org/apache/kafka/streams/kstream/CogroupedKStream.html" title="interface in org.apache.kafka.streams.kstream"><code>CogroupedKStream</code></a> via |
| <a href="../../../../../org/apache/kafka/streams/kstream/CogroupedKStream.html#windowedBy-org.apache.kafka.streams.kstream.Windows-"><code>CogroupedKStream.windowedBy(Windows)</code></a>.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../org/apache/kafka/streams/kstream/KStream.html" title="interface in org.apache.kafka.streams.kstream"><code>KStream</code></a>, |
| <a href="../../../../../org/apache/kafka/streams/kstream/KGroupedStream.html" title="interface in org.apache.kafka.streams.kstream"><code>KGroupedStream</code></a>, |
| <a href="../../../../../org/apache/kafka/streams/kstream/CogroupedKStream.html" title="interface in org.apache.kafka.streams.kstream"><code>CogroupedKStream</code></a></dd> |
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| <h3>Method Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation"> |
| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../org/apache/kafka/streams/kstream/KTable.html" title="interface in org.apache.kafka.streams.kstream">KTable</a><<a href="../../../../../org/apache/kafka/streams/kstream/Windowed.html" title="class in org.apache.kafka.streams.kstream">Windowed</a><<a href="../../../../../org/apache/kafka/streams/kstream/TimeWindowedCogroupedKStream.html" title="type parameter in TimeWindowedCogroupedKStream">K</a>>,<a href="../../../../../org/apache/kafka/streams/kstream/TimeWindowedCogroupedKStream.html" title="type parameter in TimeWindowedCogroupedKStream">V</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/kafka/streams/kstream/TimeWindowedCogroupedKStream.html#aggregate-org.apache.kafka.streams.kstream.Initializer-">aggregate</a></span>(<a href="../../../../../org/apache/kafka/streams/kstream/Initializer.html" title="interface in org.apache.kafka.streams.kstream">Initializer</a><<a href="../../../../../org/apache/kafka/streams/kstream/TimeWindowedCogroupedKStream.html" title="type parameter in TimeWindowedCogroupedKStream">V</a>> initializer)</code> |
| <div class="block">Aggregate the values of records in this stream by the grouped key and defined windows.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../org/apache/kafka/streams/kstream/KTable.html" title="interface in org.apache.kafka.streams.kstream">KTable</a><<a href="../../../../../org/apache/kafka/streams/kstream/Windowed.html" title="class in org.apache.kafka.streams.kstream">Windowed</a><<a href="../../../../../org/apache/kafka/streams/kstream/TimeWindowedCogroupedKStream.html" title="type parameter in TimeWindowedCogroupedKStream">K</a>>,<a href="../../../../../org/apache/kafka/streams/kstream/TimeWindowedCogroupedKStream.html" title="type parameter in TimeWindowedCogroupedKStream">V</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/kafka/streams/kstream/TimeWindowedCogroupedKStream.html#aggregate-org.apache.kafka.streams.kstream.Initializer-org.apache.kafka.streams.kstream.Materialized-">aggregate</a></span>(<a href="../../../../../org/apache/kafka/streams/kstream/Initializer.html" title="interface in org.apache.kafka.streams.kstream">Initializer</a><<a href="../../../../../org/apache/kafka/streams/kstream/TimeWindowedCogroupedKStream.html" title="type parameter in TimeWindowedCogroupedKStream">V</a>> initializer, |
| <a href="../../../../../org/apache/kafka/streams/kstream/Materialized.html" title="class in org.apache.kafka.streams.kstream">Materialized</a><<a href="../../../../../org/apache/kafka/streams/kstream/TimeWindowedCogroupedKStream.html" title="type parameter in TimeWindowedCogroupedKStream">K</a>,<a href="../../../../../org/apache/kafka/streams/kstream/TimeWindowedCogroupedKStream.html" title="type parameter in TimeWindowedCogroupedKStream">V</a>,<a href="../../../../../org/apache/kafka/streams/state/WindowStore.html" title="interface in org.apache.kafka.streams.state">WindowStore</a><org.apache.kafka.common.utils.Bytes,byte[]>> materialized)</code> |
| <div class="block">Aggregate the values of records in this stream by the grouped key and defined windows.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../org/apache/kafka/streams/kstream/KTable.html" title="interface in org.apache.kafka.streams.kstream">KTable</a><<a href="../../../../../org/apache/kafka/streams/kstream/Windowed.html" title="class in org.apache.kafka.streams.kstream">Windowed</a><<a href="../../../../../org/apache/kafka/streams/kstream/TimeWindowedCogroupedKStream.html" title="type parameter in TimeWindowedCogroupedKStream">K</a>>,<a href="../../../../../org/apache/kafka/streams/kstream/TimeWindowedCogroupedKStream.html" title="type parameter in TimeWindowedCogroupedKStream">V</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/kafka/streams/kstream/TimeWindowedCogroupedKStream.html#aggregate-org.apache.kafka.streams.kstream.Initializer-org.apache.kafka.streams.kstream.Named-">aggregate</a></span>(<a href="../../../../../org/apache/kafka/streams/kstream/Initializer.html" title="interface in org.apache.kafka.streams.kstream">Initializer</a><<a href="../../../../../org/apache/kafka/streams/kstream/TimeWindowedCogroupedKStream.html" title="type parameter in TimeWindowedCogroupedKStream">V</a>> initializer, |
| <a href="../../../../../org/apache/kafka/streams/kstream/Named.html" title="class in org.apache.kafka.streams.kstream">Named</a> named)</code> |
| <div class="block">Aggregate the values of records in this stream by the grouped key and defined windows.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../org/apache/kafka/streams/kstream/KTable.html" title="interface in org.apache.kafka.streams.kstream">KTable</a><<a href="../../../../../org/apache/kafka/streams/kstream/Windowed.html" title="class in org.apache.kafka.streams.kstream">Windowed</a><<a href="../../../../../org/apache/kafka/streams/kstream/TimeWindowedCogroupedKStream.html" title="type parameter in TimeWindowedCogroupedKStream">K</a>>,<a href="../../../../../org/apache/kafka/streams/kstream/TimeWindowedCogroupedKStream.html" title="type parameter in TimeWindowedCogroupedKStream">V</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/kafka/streams/kstream/TimeWindowedCogroupedKStream.html#aggregate-org.apache.kafka.streams.kstream.Initializer-org.apache.kafka.streams.kstream.Named-org.apache.kafka.streams.kstream.Materialized-">aggregate</a></span>(<a href="../../../../../org/apache/kafka/streams/kstream/Initializer.html" title="interface in org.apache.kafka.streams.kstream">Initializer</a><<a href="../../../../../org/apache/kafka/streams/kstream/TimeWindowedCogroupedKStream.html" title="type parameter in TimeWindowedCogroupedKStream">V</a>> initializer, |
| <a href="../../../../../org/apache/kafka/streams/kstream/Named.html" title="class in org.apache.kafka.streams.kstream">Named</a> named, |
| <a href="../../../../../org/apache/kafka/streams/kstream/Materialized.html" title="class in org.apache.kafka.streams.kstream">Materialized</a><<a href="../../../../../org/apache/kafka/streams/kstream/TimeWindowedCogroupedKStream.html" title="type parameter in TimeWindowedCogroupedKStream">K</a>,<a href="../../../../../org/apache/kafka/streams/kstream/TimeWindowedCogroupedKStream.html" title="type parameter in TimeWindowedCogroupedKStream">V</a>,<a href="../../../../../org/apache/kafka/streams/state/WindowStore.html" title="interface in org.apache.kafka.streams.state">WindowStore</a><org.apache.kafka.common.utils.Bytes,byte[]>> materialized)</code> |
| <div class="block">Aggregate the values of records in this stream by the grouped key and defined windows.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
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| <!-- --> |
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| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>aggregate</h4> |
| <pre><a href="../../../../../org/apache/kafka/streams/kstream/KTable.html" title="interface in org.apache.kafka.streams.kstream">KTable</a><<a href="../../../../../org/apache/kafka/streams/kstream/Windowed.html" title="class in org.apache.kafka.streams.kstream">Windowed</a><<a href="../../../../../org/apache/kafka/streams/kstream/TimeWindowedCogroupedKStream.html" title="type parameter in TimeWindowedCogroupedKStream">K</a>>,<a href="../../../../../org/apache/kafka/streams/kstream/TimeWindowedCogroupedKStream.html" title="type parameter in TimeWindowedCogroupedKStream">V</a>> aggregate(<a href="../../../../../org/apache/kafka/streams/kstream/Initializer.html" title="interface in org.apache.kafka.streams.kstream">Initializer</a><<a href="../../../../../org/apache/kafka/streams/kstream/TimeWindowedCogroupedKStream.html" title="type parameter in TimeWindowedCogroupedKStream">V</a>> initializer)</pre> |
| <div class="block">Aggregate the values of records in this stream by the grouped key and defined windows. |
| Records with <code>null</code> key or value are ignored. |
| The result is written into a local <a href="../../../../../org/apache/kafka/streams/state/WindowStore.html" title="interface in org.apache.kafka.streams.state"><code>WindowStore</code></a> (which is basically an ever-updating materialized view). |
| Furthermore, updates to the store are sent downstream into a <a href="../../../../../org/apache/kafka/streams/kstream/KTable.html" title="interface in org.apache.kafka.streams.kstream"><code>KTable</code></a> changelog stream. |
| <p> |
| The specified <a href="../../../../../org/apache/kafka/streams/kstream/Initializer.html" title="interface in org.apache.kafka.streams.kstream"><code>Initializer</code></a> is applied directly before the first input record (per key) in each window is |
| processed to provide an initial intermediate aggregation result that is used to process the first record for |
| the window (per key). |
| The specified <a href="../../../../../org/apache/kafka/streams/kstream/Aggregator.html" title="interface in org.apache.kafka.streams.kstream"><code>Aggregator</code></a> (as specified in <a href="../../../../../org/apache/kafka/streams/kstream/KGroupedStream.html#cogroup-org.apache.kafka.streams.kstream.Aggregator-"><code>KGroupedStream.cogroup(Aggregator)</code></a> or |
| <a href="../../../../../org/apache/kafka/streams/kstream/CogroupedKStream.html#cogroup-org.apache.kafka.streams.kstream.KGroupedStream-org.apache.kafka.streams.kstream.Aggregator-"><code>CogroupedKStream.cogroup(KGroupedStream, Aggregator)</code></a>) is applied for each input record and computes a new |
| aggregate using the current aggregate (or for the very first record using the intermediate aggregation result |
| provided via the <a href="../../../../../org/apache/kafka/streams/kstream/Initializer.html" title="interface in org.apache.kafka.streams.kstream"><code>Initializer</code></a>) and the record's value. |
| Thus, <code>aggregate()</code> can be used to compute aggregate functions like count or sum etc. |
| <p> |
| The default key and value serde from the config will be used for serializing the result. |
| If a different serde is required then you should use <a href="../../../../../org/apache/kafka/streams/kstream/TimeWindowedCogroupedKStream.html#aggregate-org.apache.kafka.streams.kstream.Initializer-org.apache.kafka.streams.kstream.Materialized-"><code>aggregate(Initializer, Materialized)</code></a>. |
| Not all updates might get sent downstream, as an internal cache is used to deduplicate consecutive updates to |
| the same window and key. |
| The rate of propagated updates depends on your input data rate, the number of distinct keys, the number of |
| parallel running Kafka Streams instances, and the <a href="../../../../../org/apache/kafka/streams/StreamsConfig.html" title="class in org.apache.kafka.streams"><code>configuration</code></a> parameters for |
| <a href="../../../../../org/apache/kafka/streams/StreamsConfig.html#CACHE_MAX_BYTES_BUFFERING_CONFIG"><code>cache size</code></a>, and |
| <a href="../../../../../org/apache/kafka/streams/StreamsConfig.html#COMMIT_INTERVAL_MS_CONFIG"><code>commit intervall</code></a>. |
| <p> |
| For failure and recovery the store will be backed by an internal changelog topic that will be created in Kafka. |
| The changelog topic will be named "${applicationId}-${internalStoreName}-changelog", where "applicationId" is |
| user-specified in <a href="../../../../../org/apache/kafka/streams/StreamsConfig.html" title="class in org.apache.kafka.streams"><code>StreamsConfig</code></a> via parameter |
| <a href="../../../../../org/apache/kafka/streams/StreamsConfig.html#APPLICATION_ID_CONFIG"><code>APPLICATION_ID_CONFIG</code></a>, "internalStoreName" is an internal name |
| and "-changelog" is a fixed suffix. |
| Note that the internal store name may not be queryable through Interactive Queries. |
| <p> |
| You can retrieve all generated internal topic names via <a href="../../../../../org/apache/kafka/streams/Topology.html#describe--"><code>Topology.describe()</code></a>.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>initializer</code> - an <a href="../../../../../org/apache/kafka/streams/kstream/Initializer.html" title="interface in org.apache.kafka.streams.kstream"><code>Initializer</code></a> that computes an initial intermediate aggregation result. Cannot be <code>null</code>.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a windowed <a href="../../../../../org/apache/kafka/streams/kstream/KTable.html" title="interface in org.apache.kafka.streams.kstream"><code>KTable</code></a> that contains "update" records with unmodified keys, and values that represent |
| the latest (rolling) aggregate for each key within a window</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="aggregate-org.apache.kafka.streams.kstream.Initializer-org.apache.kafka.streams.kstream.Named-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>aggregate</h4> |
| <pre><a href="../../../../../org/apache/kafka/streams/kstream/KTable.html" title="interface in org.apache.kafka.streams.kstream">KTable</a><<a href="../../../../../org/apache/kafka/streams/kstream/Windowed.html" title="class in org.apache.kafka.streams.kstream">Windowed</a><<a href="../../../../../org/apache/kafka/streams/kstream/TimeWindowedCogroupedKStream.html" title="type parameter in TimeWindowedCogroupedKStream">K</a>>,<a href="../../../../../org/apache/kafka/streams/kstream/TimeWindowedCogroupedKStream.html" title="type parameter in TimeWindowedCogroupedKStream">V</a>> aggregate(<a href="../../../../../org/apache/kafka/streams/kstream/Initializer.html" title="interface in org.apache.kafka.streams.kstream">Initializer</a><<a href="../../../../../org/apache/kafka/streams/kstream/TimeWindowedCogroupedKStream.html" title="type parameter in TimeWindowedCogroupedKStream">V</a>> initializer, |
| <a href="../../../../../org/apache/kafka/streams/kstream/Named.html" title="class in org.apache.kafka.streams.kstream">Named</a> named)</pre> |
| <div class="block">Aggregate the values of records in this stream by the grouped key and defined windows. |
| Records with <code>null</code> key or value are ignored. |
| The result is written into a local <a href="../../../../../org/apache/kafka/streams/state/WindowStore.html" title="interface in org.apache.kafka.streams.state"><code>WindowStore</code></a> (which is basically an ever-updating materialized view). |
| Furthermore, updates to the store are sent downstream into a <a href="../../../../../org/apache/kafka/streams/kstream/KTable.html" title="interface in org.apache.kafka.streams.kstream"><code>KTable</code></a> changelog stream. |
| <p> |
| The specified <a href="../../../../../org/apache/kafka/streams/kstream/Initializer.html" title="interface in org.apache.kafka.streams.kstream"><code>Initializer</code></a> is applied directly before the first input record (per key) in each window is |
| processed to provide an initial intermediate aggregation result that is used to process the first record for |
| the window (per key). |
| The specified <a href="../../../../../org/apache/kafka/streams/kstream/Aggregator.html" title="interface in org.apache.kafka.streams.kstream"><code>Aggregator</code></a> (as specified in <a href="../../../../../org/apache/kafka/streams/kstream/KGroupedStream.html#cogroup-org.apache.kafka.streams.kstream.Aggregator-"><code>KGroupedStream.cogroup(Aggregator)</code></a> or |
| <a href="../../../../../org/apache/kafka/streams/kstream/CogroupedKStream.html#cogroup-org.apache.kafka.streams.kstream.KGroupedStream-org.apache.kafka.streams.kstream.Aggregator-"><code>CogroupedKStream.cogroup(KGroupedStream, Aggregator)</code></a>) is applied for each input record and computes a new |
| aggregate using the current aggregate (or for the very first record using the intermediate aggregation result |
| provided via the <a href="../../../../../org/apache/kafka/streams/kstream/Initializer.html" title="interface in org.apache.kafka.streams.kstream"><code>Initializer</code></a>) and the record's value. |
| Thus, <code>aggregate()</code> can be used to compute aggregate functions like count or sum etc. |
| <p> |
| The default key and value serde from the config will be used for serializing the result. |
| If a different serde is required then you should use <a href="../../../../../org/apache/kafka/streams/kstream/TimeWindowedCogroupedKStream.html#aggregate-org.apache.kafka.streams.kstream.Initializer-org.apache.kafka.streams.kstream.Named-org.apache.kafka.streams.kstream.Materialized-"><code>aggregate(Initializer, Named, Materialized)</code></a>. |
| Not all updates might get sent downstream, as an internal cache is used to deduplicate consecutive updates to |
| the same window and key. |
| The rate of propagated updates depends on your input data rate, the number of distinct |
| keys, the number of parallel running Kafka Streams instances, and the <a href="../../../../../org/apache/kafka/streams/StreamsConfig.html" title="class in org.apache.kafka.streams"><code>configuration</code></a> |
| parameters for <a href="../../../../../org/apache/kafka/streams/StreamsConfig.html#CACHE_MAX_BYTES_BUFFERING_CONFIG"><code>cache size</code></a>, and |
| <a href="../../../../../org/apache/kafka/streams/StreamsConfig.html#COMMIT_INTERVAL_MS_CONFIG"><code>commit intervall</code></a>. |
| <p> |
| For failure and recovery the store will be backed by an internal changelog topic that will be created in Kafka. |
| The changelog topic will be named "${applicationId}-${internalStoreName}-changelog", where "applicationId" is |
| user-specified in <a href="../../../../../org/apache/kafka/streams/StreamsConfig.html" title="class in org.apache.kafka.streams"><code>StreamsConfig</code></a> via parameter |
| <a href="../../../../../org/apache/kafka/streams/StreamsConfig.html#APPLICATION_ID_CONFIG"><code>APPLICATION_ID_CONFIG</code></a>, "internalStoreName" is an internal name |
| and "-changelog" is a fixed suffix. |
| Note that the internal store name may not be queryable through Interactive Queries. |
| <p> |
| You can retrieve all generated internal topic names via <a href="../../../../../org/apache/kafka/streams/Topology.html#describe--"><code>Topology.describe()</code></a>.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>initializer</code> - an <a href="../../../../../org/apache/kafka/streams/kstream/Initializer.html" title="interface in org.apache.kafka.streams.kstream"><code>Initializer</code></a> that computes an initial intermediate aggregation result. Cannot be <code>null</code>.</dd> |
| <dd><code>named</code> - a <a href="../../../../../org/apache/kafka/streams/kstream/Named.html" title="class in org.apache.kafka.streams.kstream"><code>Named</code></a> config used to name the processor in the topology. Cannot be <code>null</code>.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a windowed <a href="../../../../../org/apache/kafka/streams/kstream/KTable.html" title="interface in org.apache.kafka.streams.kstream"><code>KTable</code></a> that contains "update" records with unmodified keys, and values that represent |
| the latest (rolling) aggregate for each key within a window</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="aggregate-org.apache.kafka.streams.kstream.Initializer-org.apache.kafka.streams.kstream.Materialized-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>aggregate</h4> |
| <pre><a href="../../../../../org/apache/kafka/streams/kstream/KTable.html" title="interface in org.apache.kafka.streams.kstream">KTable</a><<a href="../../../../../org/apache/kafka/streams/kstream/Windowed.html" title="class in org.apache.kafka.streams.kstream">Windowed</a><<a href="../../../../../org/apache/kafka/streams/kstream/TimeWindowedCogroupedKStream.html" title="type parameter in TimeWindowedCogroupedKStream">K</a>>,<a href="../../../../../org/apache/kafka/streams/kstream/TimeWindowedCogroupedKStream.html" title="type parameter in TimeWindowedCogroupedKStream">V</a>> aggregate(<a href="../../../../../org/apache/kafka/streams/kstream/Initializer.html" title="interface in org.apache.kafka.streams.kstream">Initializer</a><<a href="../../../../../org/apache/kafka/streams/kstream/TimeWindowedCogroupedKStream.html" title="type parameter in TimeWindowedCogroupedKStream">V</a>> initializer, |
| <a href="../../../../../org/apache/kafka/streams/kstream/Materialized.html" title="class in org.apache.kafka.streams.kstream">Materialized</a><<a href="../../../../../org/apache/kafka/streams/kstream/TimeWindowedCogroupedKStream.html" title="type parameter in TimeWindowedCogroupedKStream">K</a>,<a href="../../../../../org/apache/kafka/streams/kstream/TimeWindowedCogroupedKStream.html" title="type parameter in TimeWindowedCogroupedKStream">V</a>,<a href="../../../../../org/apache/kafka/streams/state/WindowStore.html" title="interface in org.apache.kafka.streams.state">WindowStore</a><org.apache.kafka.common.utils.Bytes,byte[]>> materialized)</pre> |
| <div class="block">Aggregate the values of records in this stream by the grouped key and defined windows. |
| Records with <code>null</code> key or value are ignored. |
| The result is written into a local <a href="../../../../../org/apache/kafka/streams/state/WindowStore.html" title="interface in org.apache.kafka.streams.state"><code>WindowStore</code></a> (which is basically an ever-updating materialized view) |
| that can be queried using the store name as provided with <a href="../../../../../org/apache/kafka/streams/kstream/Materialized.html" title="class in org.apache.kafka.streams.kstream"><code>Materialized</code></a>. |
| Furthermore, updates to the store are sent downstream into a <a href="../../../../../org/apache/kafka/streams/kstream/KTable.html" title="interface in org.apache.kafka.streams.kstream"><code>KTable</code></a> changelog stream. |
| <p> |
| The specified <a href="../../../../../org/apache/kafka/streams/kstream/Initializer.html" title="interface in org.apache.kafka.streams.kstream"><code>Initializer</code></a> is applied directly before the first input record (per key) in each window is |
| processed to provide an initial intermediate aggregation result that is used to process the first record for |
| the window (per key). |
| The specified <a href="../../../../../org/apache/kafka/streams/kstream/Aggregator.html" title="interface in org.apache.kafka.streams.kstream"><code>Aggregator</code></a> (as specified in <a href="../../../../../org/apache/kafka/streams/kstream/KGroupedStream.html#cogroup-org.apache.kafka.streams.kstream.Aggregator-"><code>KGroupedStream.cogroup(Aggregator)</code></a> or |
| <a href="../../../../../org/apache/kafka/streams/kstream/CogroupedKStream.html#cogroup-org.apache.kafka.streams.kstream.KGroupedStream-org.apache.kafka.streams.kstream.Aggregator-"><code>CogroupedKStream.cogroup(KGroupedStream, Aggregator)</code></a>) is applied for each input record and computes a new |
| aggregate using the current aggregate (or for the very first record using the intermediate aggregation result |
| provided via the <a href="../../../../../org/apache/kafka/streams/kstream/Initializer.html" title="interface in org.apache.kafka.streams.kstream"><code>Initializer</code></a>) and the record's value. |
| Thus, <code>aggregate()</code> can be used to compute aggregate functions like count or sum etc. |
| <p> |
| Not all updates might get sent downstream, as an internal cache is used to deduplicate consecutive updates to |
| the same window and key if caching is enabled on the <a href="../../../../../org/apache/kafka/streams/kstream/Materialized.html" title="class in org.apache.kafka.streams.kstream"><code>Materialized</code></a> instance. |
| When caching is enabled the rate of propagated updates depends on your input data rate, the number of distinct |
| keys, the number of parallel running Kafka Streams instances, and the <a href="../../../../../org/apache/kafka/streams/StreamsConfig.html" title="class in org.apache.kafka.streams"><code>configuration</code></a> |
| parameters for <a href="../../../../../org/apache/kafka/streams/StreamsConfig.html#CACHE_MAX_BYTES_BUFFERING_CONFIG"><code>cache size</code></a>, and |
| <a href="../../../../../org/apache/kafka/streams/StreamsConfig.html#COMMIT_INTERVAL_MS_CONFIG"><code>commit intervall</code></a>. |
| <p> |
| To query the local <a href="../../../../../org/apache/kafka/streams/state/ReadOnlyWindowStore.html" title="interface in org.apache.kafka.streams.state"><code>ReadOnlyWindowStore</code></a> it must be obtained via |
| <a href="../../../../../org/apache/kafka/streams/KafkaStreams.html#store-org.apache.kafka.streams.StoreQueryParameters-"><code>KafkaStreams#store(...)</code></a>: |
| <pre><code> |
| KafkaStreams streams = ... // counting words |
| Store queryableStoreName = ... // the queryableStoreName should be the name of the store as defined by the Materialized instance |
| ReadOnlyWindowStore<K, ValueAndTimestamp<V>> localWindowStore = streams.store(queryableStoreName, QueryableStoreTypes.<K, ValueAndTimestamp<V>>timestampedWindowStore()); |
| |
| K key = "some-word"; |
| long fromTime = ...; |
| long toTime = ...; |
| WindowStoreIterator<ValueAndTimestamp<V>> aggregateStore = localWindowStore.fetch(key, timeFrom, timeTo); // key must be local (application state is shared over all running Kafka Streams instances) |
| </code></pre> |
| For non-local keys, a custom RPC mechanism must be implemented using <a href="../../../../../org/apache/kafka/streams/KafkaStreams.html#allMetadata--"><code>KafkaStreams.allMetadata()</code></a> to |
| query the value of the key on a parallel running instance of your Kafka Streams application. |
| <p> |
| For failure and recovery the store will be backed by an internal changelog topic that will be created in Kafka. |
| Therefore, the store name defined by the <a href="../../../../../org/apache/kafka/streams/kstream/Materialized.html" title="class in org.apache.kafka.streams.kstream"><code>Materialized</code></a> instance must be a valid Kafka topic name and |
| cannot contain characters other than ASCII alphanumerics, '.', '_' and '-'. |
| The changelog topic will be named "${applicationId}-${storeName}-changelog", where "applicationId" is |
| user-specified in <a href="../../../../../org/apache/kafka/streams/StreamsConfig.html" title="class in org.apache.kafka.streams"><code>StreamsConfig</code></a> via parameter |
| <a href="../../../../../org/apache/kafka/streams/StreamsConfig.html#APPLICATION_ID_CONFIG"><code>APPLICATION_ID_CONFIG</code></a>, "storeName" is the |
| provide store name defined in <a href="../../../../../org/apache/kafka/streams/kstream/Materialized.html" title="class in org.apache.kafka.streams.kstream"><code>Materialized</code></a>, and "-changelog" is a fixed suffix. |
| <p> |
| You can retrieve all generated internal topic names via <a href="../../../../../org/apache/kafka/streams/Topology.html#describe--"><code>Topology.describe()</code></a>.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>initializer</code> - an <a href="../../../../../org/apache/kafka/streams/kstream/Initializer.html" title="interface in org.apache.kafka.streams.kstream"><code>Initializer</code></a> that computes an initial intermediate aggregation result. Cannot be <code>null</code>.</dd> |
| <dd><code>materialized</code> - a <a href="../../../../../org/apache/kafka/streams/kstream/Materialized.html" title="class in org.apache.kafka.streams.kstream"><code>Materialized</code></a> config used to materialize a state store. Cannot be <code>null</code>.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a windowed <a href="../../../../../org/apache/kafka/streams/kstream/KTable.html" title="interface in org.apache.kafka.streams.kstream"><code>KTable</code></a> that contains "update" records with unmodified keys, and values that represent |
| the latest (rolling) aggregate for each key within a window</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="aggregate-org.apache.kafka.streams.kstream.Initializer-org.apache.kafka.streams.kstream.Named-org.apache.kafka.streams.kstream.Materialized-"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>aggregate</h4> |
| <pre><a href="../../../../../org/apache/kafka/streams/kstream/KTable.html" title="interface in org.apache.kafka.streams.kstream">KTable</a><<a href="../../../../../org/apache/kafka/streams/kstream/Windowed.html" title="class in org.apache.kafka.streams.kstream">Windowed</a><<a href="../../../../../org/apache/kafka/streams/kstream/TimeWindowedCogroupedKStream.html" title="type parameter in TimeWindowedCogroupedKStream">K</a>>,<a href="../../../../../org/apache/kafka/streams/kstream/TimeWindowedCogroupedKStream.html" title="type parameter in TimeWindowedCogroupedKStream">V</a>> aggregate(<a href="../../../../../org/apache/kafka/streams/kstream/Initializer.html" title="interface in org.apache.kafka.streams.kstream">Initializer</a><<a href="../../../../../org/apache/kafka/streams/kstream/TimeWindowedCogroupedKStream.html" title="type parameter in TimeWindowedCogroupedKStream">V</a>> initializer, |
| <a href="../../../../../org/apache/kafka/streams/kstream/Named.html" title="class in org.apache.kafka.streams.kstream">Named</a> named, |
| <a href="../../../../../org/apache/kafka/streams/kstream/Materialized.html" title="class in org.apache.kafka.streams.kstream">Materialized</a><<a href="../../../../../org/apache/kafka/streams/kstream/TimeWindowedCogroupedKStream.html" title="type parameter in TimeWindowedCogroupedKStream">K</a>,<a href="../../../../../org/apache/kafka/streams/kstream/TimeWindowedCogroupedKStream.html" title="type parameter in TimeWindowedCogroupedKStream">V</a>,<a href="../../../../../org/apache/kafka/streams/state/WindowStore.html" title="interface in org.apache.kafka.streams.state">WindowStore</a><org.apache.kafka.common.utils.Bytes,byte[]>> materialized)</pre> |
| <div class="block">Aggregate the values of records in this stream by the grouped key and defined windows. |
| Records with <code>null</code> key or value are ignored. |
| The result is written into a local <a href="../../../../../org/apache/kafka/streams/state/WindowStore.html" title="interface in org.apache.kafka.streams.state"><code>WindowStore</code></a> (which is basically an ever-updating materialized view) |
| that can be queried using the store name as provided with <a href="../../../../../org/apache/kafka/streams/kstream/Materialized.html" title="class in org.apache.kafka.streams.kstream"><code>Materialized</code></a>. |
| Furthermore, updates to the store are sent downstream into a <a href="../../../../../org/apache/kafka/streams/kstream/KTable.html" title="interface in org.apache.kafka.streams.kstream"><code>KTable</code></a> changelog stream. |
| <p> |
| The specified <a href="../../../../../org/apache/kafka/streams/kstream/Initializer.html" title="interface in org.apache.kafka.streams.kstream"><code>Initializer</code></a> is applied directly before the first input record (per key) in each window is |
| processed to provide an initial intermediate aggregation result that is used to process the first record for |
| the window (per key). |
| The specified <a href="../../../../../org/apache/kafka/streams/kstream/Aggregator.html" title="interface in org.apache.kafka.streams.kstream"><code>Aggregator</code></a> (as specified in <a href="../../../../../org/apache/kafka/streams/kstream/KGroupedStream.html#cogroup-org.apache.kafka.streams.kstream.Aggregator-"><code>KGroupedStream.cogroup(Aggregator)</code></a> or |
| <a href="../../../../../org/apache/kafka/streams/kstream/CogroupedKStream.html#cogroup-org.apache.kafka.streams.kstream.KGroupedStream-org.apache.kafka.streams.kstream.Aggregator-"><code>CogroupedKStream.cogroup(KGroupedStream, Aggregator)</code></a>) is applied for each input record and computes a new |
| aggregate using the current aggregate (or for the very first record using the intermediate aggregation result |
| provided via the <a href="../../../../../org/apache/kafka/streams/kstream/Initializer.html" title="interface in org.apache.kafka.streams.kstream"><code>Initializer</code></a>) and the record's value. |
| Thus, <code>aggregate()</code> can be used to compute aggregate functions like count or sum etc. |
| <p> |
| Not all updates might get sent downstream, as an internal cache will be used to deduplicate consecutive updates |
| to the same window and key if caching is enabled on the <a href="../../../../../org/apache/kafka/streams/kstream/Materialized.html" title="class in org.apache.kafka.streams.kstream"><code>Materialized</code></a> instance. |
| When caching is enabled the rate of propagated updates depends on your input data rate, the number of distinct |
| keys, the number of parallel running Kafka Streams instances, and the <a href="../../../../../org/apache/kafka/streams/StreamsConfig.html" title="class in org.apache.kafka.streams"><code>configuration</code></a> |
| parameters for <a href="../../../../../org/apache/kafka/streams/StreamsConfig.html#CACHE_MAX_BYTES_BUFFERING_CONFIG"><code>cache size</code></a>, and |
| <a href="../../../../../org/apache/kafka/streams/StreamsConfig.html#COMMIT_INTERVAL_MS_CONFIG"><code>commit intervall</code></a>. |
| <p> |
| To query the local <a href="../../../../../org/apache/kafka/streams/state/ReadOnlyWindowStore.html" title="interface in org.apache.kafka.streams.state"><code>ReadOnlyWindowStore</code></a> it must be obtained via |
| <a href="../../../../../org/apache/kafka/streams/KafkaStreams.html#store-org.apache.kafka.streams.StoreQueryParameters-"><code>KafkaStreams#store(...)</code></a>: |
| <pre><code> |
| KafkaStreams streams = ... // counting words |
| Store queryableStoreName = ... // the queryableStoreName should be the name of the store as defined by the Materialized instance |
| ReadOnlyWindowStore<K, ValueAndTimestamp<V>> localWindowStore = streams.store(queryableStoreName, QueryableStoreTypes.<K, ValueAndTimestamp<V>>timestampedWindowStore()); |
| |
| K key = "some-word"; |
| long fromTime = ...; |
| long toTime = ...; |
| WindowStoreIterator<ValueAndTimestamp<V>> aggregateStore = localWindowStore.fetch(key, timeFrom, timeTo); // key must be local (application state is shared over all running Kafka Streams instances) |
| </code></pre> |
| For non-local keys, a custom RPC mechanism must be implemented using <a href="../../../../../org/apache/kafka/streams/KafkaStreams.html#allMetadata--"><code>KafkaStreams.allMetadata()</code></a> to |
| query the value of the key on a parallel running instance of your Kafka Streams application. |
| <p> |
| For failure and recovery the store will be backed by an internal changelog topic that will be created in Kafka. |
| Therefore, the store name defined by the <a href="../../../../../org/apache/kafka/streams/kstream/Materialized.html" title="class in org.apache.kafka.streams.kstream"><code>Materialized</code></a> instance must be a valid Kafka topic name and |
| cannot contain characters other than ASCII alphanumerics, '.', '_' and '-'. |
| The changelog topic will be named "${applicationId}-${storeName}-changelog", where "applicationId" is |
| user-specified in <a href="../../../../../org/apache/kafka/streams/StreamsConfig.html" title="class in org.apache.kafka.streams"><code>StreamsConfig</code></a> via parameter |
| <a href="../../../../../org/apache/kafka/streams/StreamsConfig.html#APPLICATION_ID_CONFIG"><code>APPLICATION_ID_CONFIG</code></a>, "storeName" is the |
| provide store name defined in <a href="../../../../../org/apache/kafka/streams/kstream/Materialized.html" title="class in org.apache.kafka.streams.kstream"><code>Materialized</code></a>, and "-changelog" is a fixed suffix. |
| <p> |
| You can retrieve all generated internal topic names via <a href="../../../../../org/apache/kafka/streams/Topology.html#describe--"><code>Topology.describe()</code></a>.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>initializer</code> - an <a href="../../../../../org/apache/kafka/streams/kstream/Initializer.html" title="interface in org.apache.kafka.streams.kstream"><code>Initializer</code></a> that computes an initial intermediate aggregation result. Cannot be <code>null</code>.</dd> |
| <dd><code>named</code> - a <a href="../../../../../org/apache/kafka/streams/kstream/Named.html" title="class in org.apache.kafka.streams.kstream"><code>Named</code></a> config used to name the processor in the topology. Cannot be <code>null</code>.</dd> |
| <dd><code>materialized</code> - a <a href="../../../../../org/apache/kafka/streams/kstream/Materialized.html" title="class in org.apache.kafka.streams.kstream"><code>Materialized</code></a> config used to materialize a state store. Cannot be <code>null</code>.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a windowed <a href="../../../../../org/apache/kafka/streams/kstream/KTable.html" title="interface in org.apache.kafka.streams.kstream"><code>KTable</code></a> that contains "update" records with unmodified keys, and values that represent |
| the latest (rolling) aggregate for each key within a window</dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
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