Modified: incubator/s4/site/index.html URL: http://svn.apache.org/viewvc/incubator/s4/site/index.html?rev=1488543&r1=1488542&r2=1488543&view=diff ============================================================================== --- incubator/s4/site/index.html (original) +++ incubator/s4/site/index.html Sat Jun 1 16:37:44 2013 @@ -1,16 +1,17 @@ - + - - -S4: Distributed Stream Computing Platform - - - - - - - - - + + + + +
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March 2013: S4 0.6.0 Release Candidate available for download. Check the improved documentation!.
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August 2012: S4 0.5.0 has been released! Get it here!.
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S4 0.5.0 "Piper" is a complete refactoring of the previous version of S4. It provides a clearer API and a more robust implementation. It features TCP based communications, state recovery, and a new set of tools. More information is available in an overview and you may also check the release notes.
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S4 is a general-purpose, distributed, scalable, fault-tolerant, pluggable platform that allows programmers to easily develop applications for processing continuous unbounded streams of data.

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motivation

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S4 fills the gap between complex proprietary systems and batch-oriented open source computing platforms. We aim to develop a high performance computing platform that hides the complexity inherent in parallel processing system from the application programmer.

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implementation

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The core platform is written in Java. The implementation is modular and pluggable, and S4 applications can be easily and dynamically combined for creating more sophisticated stream processing systems.

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open source

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S4 was initially released by Yahoo! Inc. in October 2010 and is an Apache Incubator project since September 2011. It is licensed under the Apache 2.0 license.

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overview

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proven

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S4 has been deployed in production systems at Yahoo! to process thousands of search queries per second.

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decentralized

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All nodes are symmetric with no centralized service and no single point of failure. This greatly simplifies deployments and cluster configuration changes.

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scalable

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Throughput increases linearly as additional nodes are added to the cluster. There is no predefined limit on the number of nodes that can be supported.

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extensible

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Applications can easily be written and deployed using a simple API. Many basic applications for stream processing are available out of the box and more are being written.

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cluster management

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S4 hides all cluster management tasks using a communication layer built on top of ZooKeeper, a distributed, open-source coordination service for distributed applications.

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fault-tolerance

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When a server in the cluster fails, a stand-by server is automatically activated to take over the tasks. Checkpointing and recovery minimize state loss.

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disclaimer

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Apache S4 is an effort undergoing incubation at the Apache Software Foundation (ASF), sponsored by the Apache Incubator PMC. Incubation is required of all newly accepted projects until a further review indicates that the infrastructure, communications, and decision making process have stabilized in a manner consistent with other successful ASF projects. While incubation status is not necessarily a reflection of the completeness or stability of the code, it does indicate that the project has yet to be fully endorsed by the ASF.

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