high_scalability high_scalability-2012 high_scalability-2012-1242 knowledge-graph by maker-knowledge-mining
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Introduction: A consequence of Service Oriented Architectures is the burning need to provide services at scale. The architecture that has evolved to satisfy these requirements is a little known technique called the Cell Architecture. A Cell Architecture is based on the idea that massive scale requires parallelization and parallelization requires components be isolated from each other. These islands of isolation are called cells. A cell is a self-contained installation that can satisfy all the operations for a shard . A shard is a subset of a much larger dataset, typically a range of users, for example. Cell Architectures have several advantages: Cells provide a unit of parallelization that can be adjusted to any size as the user base grows. Cell are added in an incremental fashion as more capacity is required. Cells isolate failures. One cell failure does not impact other cells. Cells provide isolation as the storage and application horsepower to process requests is independent of othe
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1 A consequence of Service Oriented Architectures is the burning need to provide services at scale. [sent-1, score-0.289]
2 The architecture that has evolved to satisfy these requirements is a little known technique called the Cell Architecture. [sent-2, score-0.288]
3 A Cell Architecture is based on the idea that massive scale requires parallelization and parallelization requires components be isolated from each other. [sent-3, score-0.598]
4 A cell is a self-contained installation that can satisfy all the operations for a shard . [sent-5, score-0.852]
5 A shard is a subset of a much larger dataset, typically a range of users, for example. [sent-6, score-0.088]
6 Cell Architectures have several advantages: Cells provide a unit of parallelization that can be adjusted to any size as the user base grows. [sent-7, score-0.364]
7 Cells provide isolation as the storage and application horsepower to process requests is independent of other cells. [sent-11, score-0.354]
8 Cells enable nice capabilities like the ability to test upgrades, implement rolling upgrades, and test different versions of software. [sent-12, score-0.112]
9 Cells can fail, be upgraded, and distributed across datacenters independent of other cells. [sent-13, score-0.087]
10 A number of startups make use of Cell Architectures: Tumblr : Users are mapped into cells and many cells exist per data center. [sent-14, score-0.509]
11 Each cell has an HBase cluster, service cluster, and Redis caching cluster. [sent-15, score-0.702]
12 Users are homed to a cell and all cells consume all posts via firehose updates. [sent-16, score-1.214]
13 Background tasks consume from the firehose to populate tables and process requests. [sent-17, score-0.347]
14 Flickr : Uses a federated approach where all a user’s data is stored on a shard which is a cluster of different services. [sent-19, score-0.282]
15 Facebook : The Messages service has as the basic building block of their system a cluster of machines and services called a cell. [sent-20, score-0.353]
16 A cell consists of ZooKeeper controllers, an application server cluster, and a metadata store. [sent-21, score-0.692]
17 Pods are self-contained sets of functionality consisting of 50 nodes, Oracle RAC servers, and Java application servers. [sent-23, score-0.067]
18 If a pod fails only the users on that pod are impacted. [sent-25, score-0.562]
19 The key to the cell is you are creating a scalable and robust MTBF friendly service. [sent-26, score-0.691]
20 A service than can be used as a bedrock component in a system of other services coordinated by a programmable orchestration layer. [sent-27, score-0.455]
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