class RandomBlockReplicationPolicy extends BlockReplicationPolicy with Logging
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- BlockReplicationPolicy.scala
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- new RandomBlockReplicationPolicy()
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def
prioritize(blockManagerId: BlockManagerId, peers: Seq[BlockManagerId], peersReplicatedTo: HashSet[BlockManagerId], blockId: BlockId, numReplicas: Int): List[BlockManagerId]
Method to prioritize a bunch of candidate peers of a block.
Method to prioritize a bunch of candidate peers of a block. This is a basic implementation, that just makes sure we put blocks on different hosts, if possible
- blockManagerId
Id of the current BlockManager for self identification
- peers
A list of peers of a BlockManager
- peersReplicatedTo
Set of peers already replicated to
- blockId
BlockId of the block being replicated. This can be used as a source of randomness if needed.
- numReplicas
Number of peers we need to replicate to
- returns
A prioritized list of peers. Lower the index of a peer, higher its priority
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- RandomBlockReplicationPolicy → BlockReplicationPolicy
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