| <table class="data-table"><tbody> |
| <tr> |
| <th>Name</th> |
| <th>Description</th> |
| <th>Type</th> |
| <th>Default</th> |
| <th>Valid Values</th> |
| <th>Importance</th> |
| </tr> |
| <tr> |
| <td>application.id</td><td>An identifier for the stream processing application. Must be unique within the Kafka cluster. It is used as 1) the default client-id prefix, 2) the group-id for membership management, 3) the changelog topic prefix.</td><td>string</td><td></td><td></td><td>high</td></tr> |
| <tr> |
| <td>bootstrap.servers</td><td>A list of host/port pairs to use for establishing the initial connection to the Kafka cluster. The client will make use of all servers irrespective of which servers are specified here for bootstrapping—this list only impacts the initial hosts used to discover the full set of servers. This list should be in the form <code>host1:port1,host2:port2,...</code>. Since these servers are just used for the initial connection to discover the full cluster membership (which may change dynamically), this list need not contain the full set of servers (you may want more than one, though, in case a server is down).</td><td>list</td><td></td><td></td><td>high</td></tr> |
| <tr> |
| <td>client.id</td><td>An id string to pass to the server when making requests. The purpose of this is to be able to track the source of requests beyond just ip/port by allowing a logical application name to be included in server-side request logging.</td><td>string</td><td>""</td><td></td><td>high</td></tr> |
| <tr> |
| <td>zookeeper.connect</td><td>Zookeeper connect string for Kafka topics management.</td><td>string</td><td>""</td><td></td><td>high</td></tr> |
| <tr> |
| <td>key.serde</td><td>Serializer / deserializer class for key that implements the <code>Serde</code> interface.</td><td>class</td><td>class org.apache.kafka.common.serialization.Serdes$ByteArraySerde</td><td></td><td>medium</td></tr> |
| <tr> |
| <td>partition.grouper</td><td>Partition grouper class that implements the <code>PartitionGrouper</code> interface.</td><td>class</td><td>class org.apache.kafka.streams.processor.DefaultPartitionGrouper</td><td></td><td>medium</td></tr> |
| <tr> |
| <td>replication.factor</td><td>The replication factor for change log topics and repartition topics created by the stream processing application.</td><td>int</td><td>1</td><td></td><td>medium</td></tr> |
| <tr> |
| <td>state.dir</td><td>Directory location for state store.</td><td>string</td><td>/tmp/kafka-streams</td><td></td><td>medium</td></tr> |
| <tr> |
| <td>timestamp.extractor</td><td>Timestamp extractor class that implements the <code>TimestampExtractor</code> interface.</td><td>class</td><td>class org.apache.kafka.streams.processor.ConsumerRecordTimestampExtractor</td><td></td><td>medium</td></tr> |
| <tr> |
| <td>value.serde</td><td>Serializer / deserializer class for value that implements the <code>Serde</code> interface.</td><td>class</td><td>class org.apache.kafka.common.serialization.Serdes$ByteArraySerde</td><td></td><td>medium</td></tr> |
| <tr> |
| <td>buffered.records.per.partition</td><td>The maximum number of records to buffer per partition.</td><td>int</td><td>1000</td><td></td><td>low</td></tr> |
| <tr> |
| <td>commit.interval.ms</td><td>The frequency with which to save the position of the processor.</td><td>long</td><td>30000</td><td></td><td>low</td></tr> |
| <tr> |
| <td>metric.reporters</td><td>A list of classes to use as metrics reporters. Implementing the <code>MetricReporter</code> interface allows plugging in classes that will be notified of new metric creation. The JmxReporter is always included to register JMX statistics.</td><td>list</td><td>[]</td><td></td><td>low</td></tr> |
| <tr> |
| <td>metrics.num.samples</td><td>The number of samples maintained to compute metrics.</td><td>int</td><td>2</td><td>[1,...]</td><td>low</td></tr> |
| <tr> |
| <td>metrics.sample.window.ms</td><td>The window of time a metrics sample is computed over.</td><td>long</td><td>30000</td><td>[0,...]</td><td>low</td></tr> |
| <tr> |
| <td>num.standby.replicas</td><td>The number of standby replicas for each task.</td><td>int</td><td>0</td><td></td><td>low</td></tr> |
| <tr> |
| <td>num.stream.threads</td><td>The number of threads to execute stream processing.</td><td>int</td><td>1</td><td></td><td>low</td></tr> |
| <tr> |
| <td>poll.ms</td><td>The amount of time in milliseconds to block waiting for input.</td><td>long</td><td>100</td><td></td><td>low</td></tr> |
| <tr> |
| <td>state.cleanup.delay.ms</td><td>The amount of time in milliseconds to wait before deleting state when a partition has migrated.</td><td>long</td><td>60000</td><td></td><td>low</td></tr> |
| </tbody></table> |
