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Responsible Peer(RP) Replication in DHT level

Responsible Peer(RP) Replication in DHT level. Song Yongchao (melodysong@huawei.com). Step1: Choose location to replicate. Choose peer A, B to replicate a keyM/value pair. RP(responsible peer). maintenance. maintenance. B. A. Step2: when replica nodes fail.

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Responsible Peer(RP) Replication in DHT level

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  1. Responsible Peer(RP) Replicationin DHT level Song Yongchao (melodysong@huawei.com)

  2. Step1: Choose location to replicate Choose peer A, B to replicate a keyM/value pair RP(responsible peer) maintenance maintenance B A

  3. Step2: when replica nodes fail When one replica node fails, RP choose a new node to replicate RP Detect failure X X maintenance maintenance X B A maintenance New replica node C

  4. Step3: when responsible peer fails RP X New RP for KeyM Detect failure X maintenance DHT lookup and transfer B A Replica peer lookup the new RP with looking up KeyM in the DHT and transfer KeyM/value to the new RP for KeyM

  5. Step4: when the RP changes gracefully Handover keyM/value pair and replica Management to the New RP RP New RP for KeyM maintenance maintenance B A Due to overlay topology changes, the reponsible peer may change, RP transfers keyM/value to its new responsible peer and hand ove the management of replication for keyM to it

  6. Step5: handle requests when responsible peer is busy RP Busy Relay the request to replica node for KeyM Get request for KeyM B A When the responsible peer is busy, it can relay requests of its responsible key to the replica, which can prevent its busy status getting worse.

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