Name	Description	Type	Default	Valid Values	Importance
application.id	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.	string			high
bootstrap.servers	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 host1:port1,host2:port2,.... 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).	list			high
replication.factor	The replication factor for change log topics and repartition topics created by the stream processing application.	int	1		high
state.dir	Directory location for state store.	string	/tmp/kafka-streams		high
cache.max.bytes.buffering	Maximum number of memory bytes to be used for buffering across all threads	long	10485760	[0,...]	medium
client.id	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.	string	""		medium
default.key.serde	Default serializer / deserializer class for key that implements the Serde interface.	class	org.apache.kafka.common.serialization.Serdes$ByteArraySerde		medium
default.timestamp.extractor	Default timestamp extractor class that implements the TimestampExtractor interface.	class	org.apache.kafka.streams.processor.FailOnInvalidTimestamp		medium
default.value.serde	Default serializer / deserializer class for value that implements the Serde interface.	class	org.apache.kafka.common.serialization.Serdes$ByteArraySerde		medium
num.standby.replicas	The number of standby replicas for each task.	int	0		medium
num.stream.threads	The number of threads to execute stream processing.	int	1		medium
processing.guarantee	The processing guarantee that should be used. Possible values are at_least_once (default) and exactly_once. Note that exactly-once processing requires a cluster of at least three brokers by default what is the recommended setting for production; for development you can change this, by adjusting broker setting `transaction.state.log.replication.factor`.	string	at_least_once	[at_least_once, exactly_once]	medium
security.protocol	Protocol used to communicate with brokers. Valid values are: PLAINTEXT, SSL, SASL_PLAINTEXT, SASL_SSL.	string	PLAINTEXT		medium
application.server	A host:port pair pointing to an embedded user defined endpoint that can be used for discovering the locations of state stores within a single KafkaStreams application	string	""		low
buffered.records.per.partition	The maximum number of records to buffer per partition.	int	1000		low
commit.interval.ms	The frequency with which to save the position of the processor. (Note, if 'processing.guarantee' is set to 'exactly_once', the default value is 100, otherwise the default value is 30000.	long	30000		low
connections.max.idle.ms	Close idle connections after the number of milliseconds specified by this config.	long	540000		low
key.serde	Serializer / deserializer class for key that implements the Serde interface. This config is deprecated, use default.key.serde instead	class	null		low
metadata.max.age.ms	The period of time in milliseconds after which we force a refresh of metadata even if we haven't seen any partition leadership changes to proactively discover any new brokers or partitions.	long	300000	[0,...]	low
metric.reporters	A list of classes to use as metrics reporters. Implementing the MetricReporter interface allows plugging in classes that will be notified of new metric creation. The JmxReporter is always included to register JMX statistics.	list	""		low
metrics.num.samples	The number of samples maintained to compute metrics.	int	2	[1,...]	low
metrics.recording.level	The highest recording level for metrics.	string	INFO	[INFO, DEBUG]	low
metrics.sample.window.ms	The window of time a metrics sample is computed over.	long	30000	[0,...]	low
partition.grouper	Partition grouper class that implements the PartitionGrouper interface.	class	org.apache.kafka.streams.processor.DefaultPartitionGrouper		low
poll.ms	The amount of time in milliseconds to block waiting for input.	long	100		low
receive.buffer.bytes	The size of the TCP receive buffer (SO_RCVBUF) to use when reading data. If the value is -1, the OS default will be used.	int	32768	[0,...]	low
reconnect.backoff.max.ms	The maximum amount of time in milliseconds to wait when reconnectng to a broker that has repeatedly failed to connect. If provided, the backoff per host will increase exponentially for each consecutive connection failure, up to this maximum. After calculating the backoff increase, 20% random jitter is added to avoid connection storms.	long	1000	[0,...]	low
reconnect.backoff.ms	The base amount of time to wait before attempting to reconnect to a given host. This avoids repeatedly connecting to a host in a tight loop. This backoff applies to all connection attempts by the client to a broker.	long	50	[0,...]	low
request.timeout.ms	The configuration controls the maximum amount of time the client will wait for the response of a request. If the response is not received before the timeout elapses the client will resend the request if necessary or fail the request if retries are exhausted.	int	40000	[0,...]	low
retry.backoff.ms	The amount of time to wait before attempting to retry a failed request to a given topic partition. This avoids repeatedly sending requests in a tight loop under some failure scenarios.	long	100	[0,...]	low
rocksdb.config.setter	A Rocks DB config setter class or class name that implements the RocksDBConfigSetter interface	class	null		low
send.buffer.bytes	The size of the TCP send buffer (SO_SNDBUF) to use when sending data. If the value is -1, the OS default will be used.	int	131072	[0,...]	low
state.cleanup.delay.ms	The amount of time in milliseconds to wait before deleting state when a partition has migrated. Only state directories that have not been modified for at least state.cleanup.delay.ms will be removed	long	600000		low
timestamp.extractor	Timestamp extractor class that implements the TimestampExtractor interface. This config is deprecated, use default.timestamp.extractor instead	class	null		low
upgrade.from	Allows upgrading from version 0.10.0 to version 0.10.1 (or newer) in a backward compatible way. Default is null. Accepted values are "0.10.0" (for upgrading from 0.10.0.x).	string	null	[null, 0.10.0]	low
value.serde	Serializer / deserializer class for value that implements the Serde interface. This config is deprecated, use default.value.serde instead	class	null		low
windowstore.changelog.additional.retention.ms	Added to a windows maintainMs to ensure data is not deleted from the log prematurely. Allows for clock drift. Default is 1 day	long	86400000		low
zookeeper.connect	Zookeeper connect string for Kafka topics management. This config is deprecated and will be ignored as Streams API does not use Zookeeper anymore.	string	""		low