Zuse Institute Berlin - CSR. Michael Nielsen » Consistent hashing. Today I get back into my post series about the Google Technology Stack, with a more detailed look at distributed dictionaries, AKA distributed key-value stores, AKA distributed hash tables. What we’d like to do is store a dictionary of key-value pairs across a cluster of computers, preferably in a way that makes it easy to manipulate the dictionary without having to think about the details of the cluster. The reason we’re interested in distributed dictionaries is because they’re used as input and output to the MapReduce framework for distributed computing.
Of course, that’s not the only reason distributed dictionaries are interesting – they’re useful for many other purposes (e.g., distributed caching). But for the purposes of this post, we’ll imagine our distributed dictionaries are being used as the input and output from a MapReduce job. I’ll describe two ways of implementing distributed dictionaries. Let’s start with the naive method. Computers. , and then store the key-value pair . . . The Bamboo DHT -- Introduction. Downloads - Downloads / UIUC Distributed Protocols Research Grou. Downloads (Traces & Software) PPLive Our crawls of the PPLive streaming system yielded client population snapshots and captured the overlay graph among clients. These traces are included below, along with the crawler code. More details and publications from the project can be found on the PPLive crawler project page. peerCounter peerCounter is a system for estimating the online population size of a dynamic p2p system, i.e., number of online hosts.
More details and publications from the project can be found on the peerCounter project page. DSI is a unified framework of building blocks that are implementations of basic distributed algorithms. Currently, DSI is only deployed in source code form. More details about the project can be found on the DSI project page. MON is an on-demand instantaneous monitoring system intended for wide-area clusters. MON code AVMON is a distributed availability-monitoring overlay meant to be robust to selfish and colluding hosts. Rappel Rappel source code (v0.1) Traces. Chimera, a Structured Peer-to-Peer Overlay. Current version of Chimera: v1.20, for both Linux and Windows download here. Thanks to Serge Kruppa, who modified Chimera 1.10 to make it compatible for Windows XP. A WinXP release of Chimera 1.10 is available. Thanks to Perry Lorier for a patch to make Chimera compatible w/ 64 Bit machines!
Structured peer-to-peer overlays, sometimes also referred to as Distributed Hash Tables (DHTs), are scalable network infrastructures that support Internet-scale network applications utilizing a decentralized resource model. At their core, these overlays provide Key-Based Routing (KBR), where messages addressed to any Key will incrementally route towards an overlay node responsible for that key. On top of the KBR layer, these overlays can support distributed storage using a DHT layer or data location using a DOLR layer. Along with Pastry, Chord, and CAN, Tapestry was one of the first structured overlay networks proposed in 2001.