A Peer-to-peer Extension of Network-Enabled Server Systems
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1 A Peer-to-peer Extension of Network-Enabled Server Systems Eddy Caron 1, Frédéric Desprez 1, Cédric Tedeschi 1 Franck Petit GRAAL Project / LIP laboratory 2 - LaRIA laboratory E-Science December 8, 2005
2 Outline 1 Introduction 2 DIET overview 3 DIET : A P2P extension of DIET 4 Propagation in the multi-hierarchy Approach Implementation 5 Performance results 6 Conclusion Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 2/31
3 Outline 1 Introduction 2 DIET overview 3 DIET : A P2P extension of DIET 4 Propagation in the multi-hierarchy Approach Implementation 5 Performance results 6 Conclusion Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 3/31
4 Context Number of resources grows every day Strong need of scalability of the grid middleware Network-Enabled Server Systems (GridRPC) Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 4/31
5 Context Number of resources grows every day Strong need of scalability of the grid middleware Network-Enabled Server Systems (GridRPC) Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 4/31
6 Context Number of resources grows every day Strong need of scalability of the grid middleware Network-Enabled Server Systems (GridRPC) Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 4/31
7 RPC and grid computing : The GridRPC paradigm Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 5/31
8 RPC and grid computing : The GridRPC paradigm Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 5/31
9 RPC and grid computing : The GridRPC paradigm Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 5/31
10 RPC and grid computing : The GridRPC paradigm Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 5/31
11 RPC and grid computing : The GridRPC paradigm Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 5/31
12 RPC and grid computing : The GridRPC paradigm Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 5/31
13 Outline 1 Introduction 2 DIET overview 3 DIET : A P2P extension of DIET 4 Propagation in the multi-hierarchy Approach Implementation 5 Performance results 6 Conclusion Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 6/31
14 DIET components The Master Agent () Root of the tree Entry Point to clients Discovery and scheduling Agents (A) Internal nodes of the tree Transmission of the request Local Agents (LA) Connected to servers Gather information about servers Server Daemons (SeD) Encapsulation of a computational server Register to a LA (its parent) List of data and problems available on it Performance prediction Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 7/31
15 DIET components The Master Agent () Root of the tree Entry Point to clients Discovery and scheduling Agents (A) Internal nodes of the tree Transmission of the request Local Agents (LA) Connected to servers Gather information about servers Server Daemons (SeD) Encapsulation of a computational server Register to a LA (its parent) List of data and problems available on it Performance prediction Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 7/31
16 DIET components The Master Agent () Root of the tree Entry Point to clients Discovery and scheduling Agents (A) Internal nodes of the tree Transmission of the request Local Agents (LA) Connected to servers Gather information about servers Server Daemons (SeD) Encapsulation of a computational server Register to a LA (its parent) List of data and problems available on it Performance prediction Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 7/31
17 DIET components The Master Agent () Root of the tree Entry Point to clients Discovery and scheduling Agents (A) Internal nodes of the tree Transmission of the request Local Agents (LA) Connected to servers Gather information about servers Server Daemons (SeD) Encapsulation of a computational server Register to a LA (its parent) List of data and problems available on it Performance prediction Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 7/31
18 DIET hierarchical architecture Client Client Client Client SeD SeD LA A LA SeD SeD SeD LA SeD SeD SeD Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 8/31
19 DIET Limits Master Agent Single point of failure Bottleneck Static configuration Don t cope with the dynamic nature of large scale platforms Deployed in one administrative domain Clients are given unique static entry point Service discovery DIET deployed in one administrative domain Small scale service discovery Enhancing grids with the P2P technology Widely suggested Very few grid middleware have integrated it Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 9/31
20 DIET Limits Master Agent Single point of failure Bottleneck Static configuration Don t cope with the dynamic nature of large scale platforms Deployed in one administrative domain Clients are given unique static entry point Service discovery DIET deployed in one administrative domain Small scale service discovery Enhancing grids with the P2P technology Widely suggested Very few grid middleware have integrated it Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 9/31
21 DIET Limits Master Agent Single point of failure Bottleneck Static configuration Don t cope with the dynamic nature of large scale platforms Deployed in one administrative domain Clients are given unique static entry point Service discovery DIET deployed in one administrative domain Small scale service discovery Enhancing grids with the P2P technology Widely suggested Very few grid middleware have integrated it Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 9/31
22 DIET Limits Master Agent Single point of failure Bottleneck Static configuration Don t cope with the dynamic nature of large scale platforms Deployed in one administrative domain Clients are given unique static entry point Service discovery DIET deployed in one administrative domain Small scale service discovery Enhancing grids with the P2P technology Widely suggested Very few grid middleware have integrated it Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 9/31
23 Outline 1 Introduction 2 DIET overview 3 DIET : A P2P extension of DIET 4 Propagation in the multi-hierarchy Approach Implementation 5 Performance results 6 Conclusion Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 10/31
24 DIET : A P2P extension of DIET Dynamically connecting hierarchies Balancing the load among the Master Agents Gathering services at larger scale Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 11/31
25 The XTA Project Open source project initiated by SUN Microsystems Rich set of protocols for building P2P applications Basic logical entity : the peer Edge peer Rendezvous peer Relay peer Communication services Endpoint service Pipe Service XTA Sockets Discovery done by advertisements Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 12/31
26 DIET architecture Client Client Client Peer to peer network of DIET agents SeD LA SeD SeD LA SeD SeD SeD Client LA Client SeD SeD Dynamic XTA connections Internal DIET tree connections (Corba) Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 13/31
27 The Multi Master Agent System (1) The Master Agent is divided into three parts : The DIET part The XTA part The NI part, interface between XTA (ava) and DIET (C++) The Multi Master Agent : Composed of all running reachable from a first All have a common advertisement s name Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 14/31
28 The Multi Master Agent System (2) The Master Agents apply the following algorithm : Initialization of the XTA part Initialization of the DIET part (via NI) Publication of its advertisement Short lifetime Periodic republication On receipt of a client request if no SeD matches the request (in its own subtree) Discovers others thanks to their advertisement Connects the other s Propagates the request through the multi-hierarchy Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 15/31
29 Outline 1 Introduction 2 DIET overview 3 DIET : A P2P extension of DIET 4 Propagation in the multi-hierarchy Approach Implementation 5 Performance results 6 Conclusion Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 16/31
30 Approach Approach 1 Peers () discovery Discovering running reachable Thanks to the XTA discovery process DHT (structured) flooding (unstructured) 2 Service discovery Looking for the requested service in the whole multi-hierarchy Exploration implemented with two algorithms STAR async PIF async Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 17/31
31 Implementation Implementation - STAR async (1) Propagation as an asynchronous star graph traversal On receipt of a client s request, fails retrieving the service in its own hierarchy (root) Discovers other s (XTA discovery) Propagates the request to other s (multicast pipe) Merges the answers sent back to the client On receipt of a propagated request Submits the request to the local hierarchy Sends the servers found back to root Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 18/31
32 Implementation Implementation - STAR async (2) Client Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 19/31
33 Implementation Implementation - STAR async (2) Client Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 19/31
34 Implementation Implementation - STAR async (2) Client t = 10 Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 19/31
35 Implementation Implementation - STAR async (2) Client Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 19/31
36 Implementation Implementation - STAR async (2) Client Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 19/31
37 Implementation Implementation (PIF async ) (1) Propagation as asynchronous PIF scheme. Wave algorithm Build a time optimal spanning tree Made of two phases Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 20/31
38 Implementation Implementation (PIF async ) (2) The Broadcast phase On receipt of a client s request, fails retrieving the service in its own hierarchy (root) Discovers other s (n) Initiates of the wave Propagates the request to other s (XTA multicast pipe) Waits for n replies and sends them to the client On receipt of a propagated request If already processed, ignores it. else The sender becomes its parent Re-propagates the request to other s except its ancestors The Feedback phase Submits the request to the local hierarchy Sends the local servers found back to its parent Forwards the answers coming from children Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 21/31
39 Implementation Implementation - PIF async (3) Client Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 22/31
40 Implementation Implementation - PIF async (3) Client Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 22/31
41 Implementation Implementation - PIF async (3) Client t=2 Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 22/31
42 Implementation Implementation - PIF async (3) Client Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 22/31
43 Implementation Implementation - PIF async (3) Client t=7 Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 22/31
44 Implementation Implementation - PIF async (3) Client Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 22/31
45 Implementation Implementation - PIF async (3) Client Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 22/31
46 Implementation Implementation - PIF async (4) Quick analysis of the PIF scheme Builds dynamically a time-optimal tree for a given root Fastest possible to reach every nodes Messages follow the spanning tree during the feedback phase Consequences : Balances the load among the links Avoids overloaded links Provides more fault-tolerance Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 23/31
47 Outline 1 Introduction 2 DIET overview 3 DIET : A P2P extension of DIET 4 Propagation in the multi-hierarchy Approach Implementation 5 Performance results 6 Conclusion Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 24/31
48 Experimental Platform VTHD Network Wide Area Network Connecting clusters 2,5 Gb/s links between clusters Clusters used Intel quadri-processors 2.4 GHz Intel bi-processors 2,8 GHz One runs per node Without the underlying hierarchy (hundreds of servers under one - Caron et al., IPDPS 2003) Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 25/31
49 Homogeneous network Time to propagate and receive all replies (s) STAR [Average value] PIF [Average value] Master Agents Number Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 26/31
50 Homogeneous network Time to propagate and receive all replies (s) STAR [Average value] PIF [Average value] Master Agents Number Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 27/31
51 Requests flooding Time to propagate and get all replies (s) STAR [Average value] PIF [Average value] Requests Frequency (Hz) Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 28/31
52 Overloaded links Time to propagate and receive all replies (s) STAR [Average value] PIF [Average value] Saturated links Numer Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 29/31
53 Outline 1 Introduction 2 DIET overview 3 DIET : A P2P extension of DIET 4 Propagation in the multi-hierarchy Approach Implementation 5 Performance results 6 Conclusion Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 30/31
54 Conclusion and future work Conclusion DIET : the first P2P extension of a NES system XTA and PIF async On-demand discovery of available servers at large scale Adapt to the dynamic and heterogeneous nature of future grids platforms On-going and future work Validate DIET at larger scale Implement other peer-to-peer algorithms Extend this approach to other NES systems (NetSolve, Ninf) Adapt peer-to-peer algorithms for service discovery Eddy Caron, Frédéric Desprez, Cédric Tedeschi, Franck Petit A P2P Extension of NES Systems 31/31
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