File: Overlay/Chord/Chord.ned
Implementation of the Chord KBR overlay as described in "Chord: A Scalable Peer-to-Peer Lookup Protocol for Internet Applications" by I. Stoica et al. published in Transactions on Networking.
Author: Ingmar Baumgart, Markus Mauch
The following diagram shows usage relationships between modules, networks and channels. Unresolved module (and channel) types are missing from the diagram. Click here to see the full picture.
If a module type shows up more than once, that means it has been defined in more than one NED file.
Chord | The main module of the Chord implementation |
ChordFingerTable | This modul contains the finger table of the Chord implementation. |
ChordSuccessorList | This modul contains the successor list of the Chord implementation. |
Name | Direction | Description |
---|---|---|
from_udp | input | gate from the UDP layer |
to_udp | output | gate to the UDP layer |
from_app | input | gate from the application |
to_app | output | gate to the application |
Name | Type | Description |
---|---|---|
chord.localPort | numeric | UDP port for Chord messages |
chord.debugOutput | bool | enable debug output |
chord.keyLength | numeric | overlay key length in bits |
chord.useCommonAPIforward | bool | enable CommonAPI forward() calls |
chord.drawOverlayTopology | bool | draw arrow to successor node? |
chord.hopCountMax | numeric | maximum number of overlay hops |
chord.recNumRedundantNodes | numeric | numRedundantNodes for recursive routing |
chord.joinOnApplicationRequest | bool | only join the overlay on application request |
chord.collectPerHopDelay | bool | delay statistics for single hops |
chord.routeMsgAcks | bool | use RPCs for route messages |
chord.lookupRedundantNodes | numeric | number of next hops in each step |
chord.lookupParallelPaths | numeric | number of parallel paths |
chord.lookupParallelRpcs | numeric | number of nodes to ask in parallel |
chord.lookupSecure | bool | true, if all nodes should be identified with a ping |
chord.lookupMerge | bool | true, if parallel Rpc results should be merged |
chord.lookupFailedNodeRpcs | bool | communicate failed nodes |
chord.lookupStrictParallelRpcs | bool | limited the number of concurrent rpcs to parameter parallelRpcs |
chord.lookupUseAllParallelResponses | bool | merge all parallel responses from earlier steps |
chord.lookupNewRpcOnEveryTimeout | bool | send a new RPC immediately after an RPC timeouts |
chord.lookupNewRpcOnEveryResponse | bool | send a new RPC after every response, even if there was no progress |
chord.lookupFinishOnFirstUnchanged | bool | finish lookup, if the last pending RPC returned without progress |
chord.routingType | string | default routing mode (iterative, semi-recursive,...) |
chord.successorListSize | numeric | max number of successors in the SuccessorList |
chord.joinRetry | numeric | after joinRetry unsuccessful join requests, we fetch a need bootstrap node from the BootstrapOracle |
chord.stabilizeRetry | numeric | retries before a successor is considered failed |
chord.joinDelay | numeric | delay between join retries (sec) |
chord.stabilizeDelay | numeric | stabilize interval (sec) |
chord.fixfingersDelay | numeric | fix_fingers interval (sec) |
chord.aggressiveJoinMode | bool | use modified (faster) JOIN protocol |
chord.extendedFingerTable | bool | use the extended finger table? |
chord.numFingerCandidates | numeric | number of fingers when using extended finger table |
chord.proximityRouting | bool | use proximity routing |
chord.mergeOptimizationL1 | bool | enable merge optimization OPL1 |
chord.mergeOptimizationL2 | bool | activate merge optimization OPL2 |
chord.mergeOptimizationL3 | bool | activate merge optimization OPL3 |
chord.mergeOptimizationL4 | bool | activate merge optimization OPL4 |
module ChordModules gates: in: from_udp; // gate from the UDP layer out: to_udp; // gate to the UDP layer in: from_app; // gate from the application out: to_app; // gate to the application submodules: chord: Chord; display: "p=60,60;i=block/circle"; fingerTable: ChordFingerTable; display: "p=150,60;i=block/table"; successorList: ChordSuccessorList; display: "p=240,60;i=block/table"; connections nocheck: from_udp --> chord.from_udp++; to_udp <-- chord.to_udp++; from_app --> chord.from_app; to_app <-- chord.to_app; endmodule