org.apache.pekko.cluster.sharding.external
ExternalShardAllocationStrategy
Companion object ExternalShardAllocationStrategy
class ExternalShardAllocationStrategy extends StartableAllocationStrategy
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Instance Constructors
- new ExternalShardAllocationStrategy(systemProvider: ClassicActorSystemProvider, typeName: String)(implicit timeout: Timeout = Timeout(5.seconds))
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- def allocateShard(requester: ExternalShardAllocationStrategy.ShardRegion, shardId: ShardId, currentShardAllocations: Map[ExternalShardAllocationStrategy.ShardRegion, IndexedSeq[ShardId]]): Future[ExternalShardAllocationStrategy.ShardRegion]
Invoked when the location of a new shard is to be decided.
Invoked when the location of a new shard is to be decided.
- requester
actor reference to the ShardRegion that requested the location of the shard, can be returned if preference should be given to the node where the shard was first accessed
- shardId
the id of the shard to allocate
- currentShardAllocations
all actor refs to
ShardRegionand their current allocated shards, in the order they were allocated- returns
a
Futureof the actor ref of the ShardRegion that is to be responsible for the shard, must be one of the references included in thecurrentShardAllocationsparameter
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- ExternalShardAllocationStrategy → ShardAllocationStrategy
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- def rebalance(currentShardAllocations: Map[ActorRef, IndexedSeq[ShardId]], rebalanceInProgress: Set[ShardId]): Future[Set[ShardId]]
Invoked periodically to decide which shards to rebalance to another location.
Invoked periodically to decide which shards to rebalance to another location.
- currentShardAllocations
all actor refs to
ShardRegionand their current allocated shards, in the order they were allocated- rebalanceInProgress
set of shards that are currently being rebalanced, i.e. you should not include these in the returned set
- returns
a
Futureof the shards to be migrated, may be empty to skip rebalance in this round
- Definition Classes
- ExternalShardAllocationStrategy → ShardAllocationStrategy
- def start(): Unit
Called before any calls to allocate/rebalance.
Called before any calls to allocate/rebalance. Do not block. If asynchronous actions are required they can be started here and delay the Futures returned by allocate/rebalance.
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- ExternalShardAllocationStrategy → StartableAllocationStrategy
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