PartitionAssignmentHandler

akka.kafka.scaladsl.PartitionAssignmentHandler

The API is new and may change in further releases.

Allows the user to execute user code when Kafka rebalances partitions between consumers, or an Alpakka Kafka consumer is stopped. Use with care: These callbacks are called synchronously on the same thread Kafka's poll() is called. A warning will be logged if a callback takes longer than the configured partition-handler-warning.

There is no point in calling Committable's commit methods as their committing won't be executed as long as any of the callbacks in this class are called. Calling commitSync on the passed akka.kafka.RestrictedConsumer is available.

This complements the methods of Kafka's ConsumerRebalanceListener with an onStop callback which is called before Consumer.close.

Attributes

Source:: PartitionAssignmentHandler.scala
Graph
Supertypes: class Object
trait Matchable
class Any
Known subtypes: class AsyncCallbacks
class Chain
object EmptyPartitionAssignmentHandler.type
class WrappedJava

Members list

Concise view

Value members

Abstract methods

See org.apache.kafka.clients.consumer.ConsumerRebalanceListener#onPartitionsAssigned

Attributes

assignedTps: The list of partitions that are now assigned to the consumer (may include partitions previously assigned to the consumer)
consumer: The akka.kafka.RestrictedConsumer gives some access to the internally used Consumer
Source:: PartitionAssignmentHandler.scala

Called when partition metadata has changed and partitions no longer exist. This can occur if a topic is deleted or if the leader's metadata is stale. See org.apache.kafka.clients.consumer.ConsumerRebalanceListener#onPartitionsLost

Attributes

consumer: The akka.kafka.RestrictedConsumer gives some access to the internally used Consumer
lostTps: The list of partitions that are no longer valid
Source:: PartitionAssignmentHandler.scala

See org.apache.kafka.clients.consumer.ConsumerRebalanceListener#onPartitionsRevoked

Attributes

consumer: The akka.kafka.RestrictedConsumer gives some access to the internally used Consumer
revokedTps: The list of partitions that were revoked from the consumer
Source:: PartitionAssignmentHandler.scala

Called before a consumer is closed. See org.apache.kafka.clients.consumer.ConsumerRebalanceListener#onPartitionsRevoked

Attributes

consumer: The akka.kafka.RestrictedConsumer gives some access to the internally used Consumer
currentTps: The list of partitions that are currently assigned to the consumer
Source:: PartitionAssignmentHandler.scala

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