akka.cluster.sharding.ShardCoordinator
ShardAllocationStrategy
Companion object ShardAllocationStrategy
trait ShardAllocationStrategy extends NoSerializationVerificationNeeded
Interface of the pluggable shard allocation and rebalancing logic used by the ShardCoordinator.
Java implementations should extend AbstractShardAllocationStrategy.
- Source
- ShardCoordinator.scala
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Abstract Value Members
- abstract def allocateShard(requester: ActorRef, shardId: ShardId, currentShardAllocations: Map[ActorRef, IndexedSeq[ShardId]]): Future[ActorRef]
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
- abstract 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
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- This member is added by an implicit conversion from ShardAllocationStrategy toany2stringadd[ShardAllocationStrategy] performed by method any2stringadd in scala.Predef.
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- def ->[B](y: B): (ShardAllocationStrategy, B)
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- This member is added by an implicit conversion from ShardAllocationStrategy toArrowAssoc[ShardAllocationStrategy] performed by method ArrowAssoc in scala.Predef.
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- @throws(classOf[java.lang.CloneNotSupportedException]) @HotSpotIntrinsicCandidate() @native()
- def ensuring(cond: (ShardAllocationStrategy) => Boolean, msg: => Any): ShardAllocationStrategy
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- This member is added by an implicit conversion from ShardAllocationStrategy toEnsuring[ShardAllocationStrategy] performed by method Ensuring in scala.Predef.
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- Ensuring
- def ensuring(cond: (ShardAllocationStrategy) => Boolean): ShardAllocationStrategy
- Implicit
- This member is added by an implicit conversion from ShardAllocationStrategy toEnsuring[ShardAllocationStrategy] performed by method Ensuring in scala.Predef.
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- def ensuring(cond: Boolean, msg: => Any): ShardAllocationStrategy
- Implicit
- This member is added by an implicit conversion from ShardAllocationStrategy toEnsuring[ShardAllocationStrategy] performed by method Ensuring in scala.Predef.
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- Ensuring
- def ensuring(cond: Boolean): ShardAllocationStrategy
- Implicit
- This member is added by an implicit conversion from ShardAllocationStrategy toEnsuring[ShardAllocationStrategy] performed by method Ensuring in scala.Predef.
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- Deprecated
(Since version 9)
- def formatted(fmtstr: String): String
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- This member is added by an implicit conversion from ShardAllocationStrategy toStringFormat[ShardAllocationStrategy] performed by method StringFormat in scala.Predef.
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(Since version 2.12.16) Use
formatString.format(value)instead ofvalue.formatted(formatString), or use thef""string interpolator. In Java 15 and later,formattedresolves to the new method in String which has reversed parameters.
- def →[B](y: B): (ShardAllocationStrategy, B)
- Implicit
- This member is added by an implicit conversion from ShardAllocationStrategy toArrowAssoc[ShardAllocationStrategy] performed by method ArrowAssoc in scala.Predef.
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(Since version 2.13.0) Use
->instead. If you still wish to display it as one character, consider using a font with programming ligatures such as Fira Code.