Kafka10.1 heartbeat.interval.ms, session.timeout.ms and max.poll.interval.ms

I am using kafka 0.10.1.1 and confused with the following 3 properties.

heartbeat.interval.ms
session.timeout.ms
max.poll.interval.ms

heartbeat.interval.ms - This was added in 0.10.1 and it will send heartbeat between polls. session.timeout.ms - This is to start rebalancing if no request to kafka and it gets reset on every poll. max.poll.interval.ms - This is across the poll.

But, when does kafka starts rebalancing? Why do we need these 3? What are the default values for all of them?

Thanks


Assuming we are talking about Kafka 0.10.1.0 or upwards where each consumer instance employs two threads to function. One is user thread from which poll is called; the other is heartbeat thread that specially takes care of heartbeat things.

session.timeout.ms is for heartbeat thread. If coordinator fails to get any heartbeat from a consumer before this time interval elapsed, it marks consumer as failed and triggers a new round of rebalance.

max.poll.interval.ms is for user thread. If message processing logic is too heavy to cost larger than this time interval, coordinator explicitly have the consumer leave the group and also triggers a new round of rebalance.

heartbeat.interval.ms is used to have other healthy consumers aware of the rebalance much faster. If coordinator triggers a rebalance, other consumers will only know of this by receiving the heartbeat response with REBALANCE_IN_PROGRESS exception encapsulated. Quicker the heartbeat request is sent, faster the consumer knows it needs to rejoin the group.

Suggested values: session.timeout.ms : a relatively low value, 10 seconds for instance. max.poll.interval.ms: based on your processing requirements heartbeat.interval.ms: a relatively low value, better 1/3 of the session.timeout.ms

Timeouts in Kafka clients and Kafka Streams – El Javi, Heartbeats are used to ensure that the consumer's session stays The value must be set lower than session.timeout.ms, but typically should be set no higher than 1/3 of Also, max.poll.interval.ms has a role in rebalances. Where is the heartbeat thread being started and maintained? What can I check to figure out why the heartbeat is timing out? I could completely understand increasing the max_poll_interval_ms as thats "my" thread (e.g. the lots_of_work), but I don't quite get why the session_timeout_ms would need to be changed.


just make them more clear, a heartbeat thread(along with user thread which invokes Poll function in the same process) will send heartbeat to coordinator every "heartbeat.interval.ms" time, and the coordinator will mark the consumer in the user thread as dead if it exceeds "session.timeout.ms" or "max.poll.interval.ms".

Consumer Configurations, The default setting of 1 byte means that fetch requests are answered as soon as a heartbeat.interval.ms The value must be set lower than session.timeout.ms , but typically should be See fetch.max.bytes for limiting the consumer request size. If poll() is not called before expiration of this timeout, then the consumer is​  heartbeat.interval.ms session.timeout.ms max.poll.interval.ms battement de coeur.d'intervalle.ms - Ceci a été ajouté dans 0.10.1 l'a et il enverra battement de coeur entre les sondages. session.délai d'attente.ms - Ce est de commencer un rééquilibrage si aucune demande de kafka et il est remis à chaque sondage.


session.timeout.ms is closely related to heartbeat.interval.ms.

heartbeat.interval.ms controls how frequently the KafkaConsumer poll() method will send a heartbeat to the group coordinator, whereas session.timeout.ms controls how long a consumer can go without sending a heartbeat.

Therefore, those two properties are typically modified together. heatbeat.interval.ms must be lower than session.timeout.ms, and is usually set to one-third of the timeout value. So if session.timeout.ms is 3 seconds, heartbeat.interval.ms should be 1 second.

max.poll.interval.ms - The maximum delay between invocations of poll() when using consumer group management. This places an upper bound on the amount of time that the consumer can be idle before fetching more records. If poll() is not called before expiration of this timeout, then the consumer is considered failed and the group will rebalance in order to reassign the partitions to another member

Kafka10.1 heartbeat.interval.ms, session.timeout.ms y max.poll , Estoy usando kafka 0.10.1.1 y confundido con las siguientes 3 propiedades.​heartbeat.interval.ms session.timeout.ms max.poll.interval.ms heartbeat.interval.​ms  Heartbeating will be controlled by the expected heartbeat.interval.ms and the upper limit defined by session.timeout.ms. Processing will be controlled by max.poll.interval.ms. On the client side, kicking the client out of the consumer group when the timeout expires.


Kafka10.1 heartbeat.interval.ms, session.timeout.ms и max.poll , Kafka10.1 heartbeat.interval.ms, session.timeout.ms и max.poll.interval.ms. Я использую kafka 0.10.1.1 и путаю со следующими 3 свойствами. Assume, you set session.timeout.ms=30000, thus, the consumer heartbeat thread must sent a heartbeat to the broker before this time expires. On the other hand, if processing of a single message takes 1 minutes, you can set max.poll.interval.ms larger than one minute to give the processing thread more time to process a message.


Kafka10.1 heartbeat.interval.ms, session.timeout.ms 및 max.poll , 위쪽 카프카 0.10.1.0 나에 대해 말하고있다. 하나는 poll 이 호출 된 사용자 스레드입니다. 다른 하나는 특별히 하트 비트를 처리하는 하트 비트 스레드입니다. Overrides: postProcessParsedConfig in class AbstractConfig Parameters: parsedValues - unmodifiable map of current configuration Returns: a map of updates that should be applied to the configuration (will be validated to prevent bad updates)


Kafka consumers, If we increase the timeout, the consumer has more room for delays but the broker notices lagging consumers later. max.poll.interval.ms : It is a very important  heartbeat.interval.ms session.timeout.ms max.poll.interval.ms latido del corazón.intervalo.ms – Este fue añadido en la 0.10.1 y se enviará latido entre las encuestas. sesión.tiempo de espera.ms – Esto es para empezar a reequilibrar si no hay petición de kafka y se restablece en cada encuesta.