trait StartableAllocationStrategy extends ShardAllocationStrategy
Shard allocation strategy where start is called by the shard coordinator before any calls to rebalance or allocate shard. This can be used if there is any expensive initialization to be done that you do not want to to in the constructor as it will happen on every node rather than just the node that hosts the ShardCoordinator
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- ShardCoordinator.scala
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- 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
- Definition Classes
- ShardAllocationStrategy
- 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
- Definition Classes
- ShardAllocationStrategy
- abstract 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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- This member is added by an implicit conversion from StartableAllocationStrategy toany2stringadd[StartableAllocationStrategy] performed by method any2stringadd in scala.Predef.
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- def ->[B](y: B): (StartableAllocationStrategy, B)
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- This member is added by an implicit conversion from StartableAllocationStrategy toArrowAssoc[StartableAllocationStrategy] performed by method ArrowAssoc in scala.Predef.
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- def ensuring(cond: (StartableAllocationStrategy) => Boolean, msg: => Any): StartableAllocationStrategy
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- This member is added by an implicit conversion from StartableAllocationStrategy toEnsuring[StartableAllocationStrategy] performed by method Ensuring in scala.Predef.
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- def ensuring(cond: (StartableAllocationStrategy) => Boolean): StartableAllocationStrategy
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- This member is added by an implicit conversion from StartableAllocationStrategy toEnsuring[StartableAllocationStrategy] performed by method Ensuring in scala.Predef.
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- def ensuring(cond: Boolean, msg: => Any): StartableAllocationStrategy
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- This member is added by an implicit conversion from StartableAllocationStrategy toEnsuring[StartableAllocationStrategy] performed by method Ensuring in scala.Predef.
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- def ensuring(cond: Boolean): StartableAllocationStrategy
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- This member is added by an implicit conversion from StartableAllocationStrategy toEnsuring[StartableAllocationStrategy] 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 StartableAllocationStrategy toStringFormat[StartableAllocationStrategy] 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): (StartableAllocationStrategy, B)
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- This member is added by an implicit conversion from StartableAllocationStrategy toArrowAssoc[StartableAllocationStrategy] 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.