akka.contrib.pattern

ShardCoordinator

Related Docs: class ShardCoordinator | package pattern

object ShardCoordinator

Source
ClusterSharding.scala
See also

ClusterSharding extension

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LeastShardAllocationStrategyAbstractShardAllocationStrategyShardAllocationStrategy
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  1. abstract class AbstractShardAllocationStrategy extends ShardAllocationStrategy

    Java API: Java implementations of custom shard allocation and rebalancing logic used by the ShardCoordinator should extend this abstract class and implement the two methods.

  2. class LeastShardAllocationStrategy extends ShardAllocationStrategy with Serializable

    The default implementation of ShardCoordinator.LeastShardAllocationStrategy allocates new shards to the ShardRegion with least number of previously allocated shards.

    The default implementation of ShardCoordinator.LeastShardAllocationStrategy allocates new shards to the ShardRegion with least number of previously allocated shards. It picks shards for rebalancing handoff from the ShardRegion with most number of previously allocated shards. They will then be allocated to the ShardRegion with least number of previously allocated shards, i.e. new members in the cluster. There is a configurable threshold of how large the difference must be to begin the rebalancing. The number of ongoing rebalancing processes can be limited.

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    @SerialVersionUID()

  3. trait ShardAllocationStrategy extends NoSerializationVerificationNeeded

    Interface of the pluggable shard allocation and rebalancing logic used by the ShardCoordinator.

    Interface of the pluggable shard allocation and rebalancing logic used by the ShardCoordinator.

    Java implementations should extend AbstractShardAllocationStrategy.

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  15. def props(handOffTimeout: FiniteDuration, rebalanceInterval: FiniteDuration, snapshotInterval: FiniteDuration, allocationStrategy: ShardAllocationStrategy): Props

    Factory method for the akka.actor.Props of the ShardCoordinator actor.

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