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| <pre>public class <span class="strong">DefaultPartitionGrouper</span> |
| extends <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> |
| implements <a href="../../../../../org/apache/kafka/streams/processor/PartitionGrouper.html" title="interface in org.apache.kafka.streams.processor">PartitionGrouper</a></pre> |
| <div class="block">Default implementation of the <a href="../../../../../org/apache/kafka/streams/processor/PartitionGrouper.html" title="interface in org.apache.kafka.streams.processor"><code>PartitionGrouper</code></a> interface that groups partitions by the partition id. |
| |
| Join operations requires that topics of the joining entities are copartitoned, i.e., being partitioned by the same key and having the same |
| number of partitions. Copartitioning is ensured by having the same number of partitions on |
| joined topics, and by using the serialization and Producer's default partitioner.</div> |
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| <td class="colOne"><code><strong><a href="../../../../../org/apache/kafka/streams/processor/DefaultPartitionGrouper.html#DefaultPartitionGrouper()">DefaultPartitionGrouper</a></strong>()</code> </td> |
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| <td class="colFirst"><code>protected int</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/kafka/streams/processor/DefaultPartitionGrouper.html#maxNumPartitions(org.apache.kafka.common.Cluster,%20java.util.Set)">maxNumPartitions</a></strong>(<a href="../../../../../org/apache/kafka/common/Cluster.html" title="class in org.apache.kafka.common">Cluster</a> metadata, |
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| <td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a><<a href="../../../../../org/apache/kafka/streams/processor/TaskId.html" title="class in org.apache.kafka.streams.processor">TaskId</a>,<a href="http://docs.oracle.com/javase/7/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</a><<a href="../../../../../org/apache/kafka/common/TopicPartition.html" title="class in org.apache.kafka.common">TopicPartition</a>>></code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/kafka/streams/processor/DefaultPartitionGrouper.html#partitionGroups(java.util.Map,%20org.apache.kafka.common.Cluster)">partitionGroups</a></strong>(<a href="http://docs.oracle.com/javase/7/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a><<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>,<a href="http://docs.oracle.com/javase/7/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</a><<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>>> topicGroups, |
| <a href="../../../../../org/apache/kafka/common/Cluster.html" title="class in org.apache.kafka.common">Cluster</a> metadata)</code> |
| <div class="block">Generate tasks with the assigned topic partitions.</div> |
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| <h4>DefaultPartitionGrouper</h4> |
| <pre>public DefaultPartitionGrouper()</pre> |
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| <h4>partitionGroups</h4> |
| <pre>public <a href="http://docs.oracle.com/javase/7/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a><<a href="../../../../../org/apache/kafka/streams/processor/TaskId.html" title="class in org.apache.kafka.streams.processor">TaskId</a>,<a href="http://docs.oracle.com/javase/7/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</a><<a href="../../../../../org/apache/kafka/common/TopicPartition.html" title="class in org.apache.kafka.common">TopicPartition</a>>> partitionGroups(<a href="http://docs.oracle.com/javase/7/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a><<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>,<a href="http://docs.oracle.com/javase/7/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</a><<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>>> topicGroups, |
| <a href="../../../../../org/apache/kafka/common/Cluster.html" title="class in org.apache.kafka.common">Cluster</a> metadata)</pre> |
| <div class="block">Generate tasks with the assigned topic partitions.</div> |
| <dl> |
| <dt><strong>Specified by:</strong></dt> |
| <dd><code><a href="../../../../../org/apache/kafka/streams/processor/PartitionGrouper.html#partitionGroups(java.util.Map,%20org.apache.kafka.common.Cluster)">partitionGroups</a></code> in interface <code><a href="../../../../../org/apache/kafka/streams/processor/PartitionGrouper.html" title="interface in org.apache.kafka.streams.processor">PartitionGrouper</a></code></dd> |
| <dt><span class="strong">Parameters:</span></dt><dd><code>topicGroups</code> - group of topics that need to be joined together</dd><dd><code>metadata</code> - metadata of the consuming cluster</dd> |
| <dt><span class="strong">Returns:</span></dt><dd>The map from generated task ids to the assigned partitions</dd></dl> |
| </li> |
| </ul> |
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| <h4>maxNumPartitions</h4> |
| <pre>protected int maxNumPartitions(<a href="../../../../../org/apache/kafka/common/Cluster.html" title="class in org.apache.kafka.common">Cluster</a> metadata, |
| <a href="http://docs.oracle.com/javase/7/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</a><<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>> topics)</pre> |
| <dl><dt><span class="strong">Throws:</span></dt> |
| <dd><code><a href="../../../../../org/apache/kafka/streams/errors/StreamsException.html" title="class in org.apache.kafka.streams.errors">StreamsException</a></code> - if no metadata can be received for a topic</dd></dl> |
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