zhangyifan27 commented on a change in pull request #609: URL: https://github.com/apache/incubator-pegasus/pull/609#discussion_r494790236
########## File path: README.md ########## @@ -7,31 +7,23 @@  -[](https://travis-ci.org/XiaoMi/pegasus) +[](https://travis-ci.org/apache/incubator-pegasus) [](https://www.apache.org/licenses/LICENSE-2.0.html) -[][github-release] +[][github-release] **Note**: The `master` branch may be in an *unstable or even broken state* during development. Please use [releases][github-release] instead of the `master` branch in order to get stable binaries. -Pegasus is a distributed key-value storage system which is designed to be: +Apache Pegasus is a distributed key-value storage system which is designed to be: - **horizontally scalable** distributed using hash-based partitioning Review comment: missing `:` here. ########## File path: README.md ########## @@ -40,43 +32,51 @@ Apart from the performance requirements, we also need a storage system to ensure multiple-level data safety and support fast data migration between data centers, automatic load balancing, and online partition split. -After investigating the existing storage systems in the open source world, -we could hardly find a suitable solution to satisfy all the requirements. -So the journey of Pegasus begins. +## Features + +- **Persistence of data**: Each write is replicated three-way to different ReplicaServers before responding to the client. Using PacificA protocol, Pegasus has the ability for strong consistent replication and membership changes. + +- **Automatic load balancing over ReplicaServers**: Load balancing is a builtin function of MetaServer, which manages the distribution of replicas. When the cluster is in an inbalance state, the administrator can invoke a simple rebalance command that automatically schedules the replica migration. + +- **Cold Backup**: Pegasus supports an extensible backup and restore mechanism to ensure data safety. The location of snapshot could be a distributed filesystem like HDFS or local filesystem. The snapshot storing in the filesystem can be further used for analysis based on [pegasus-spark](https://github.com/pegasus-kv/pegasus-spark). + +- **Eventually-consistent intra-datacenter replication**: This is a feature we called *duplication*. It allows a change made in the local cluster accesible after a short time period by the remote cluster. It help achieving higher availability of your service and gaining better performance by accessing only local cluster. ## To start using Pegasus See our documentation on [Pegasus Website][website]. +## Client drivers + +Pegasus has support for serveral languages: + +- [Java](https://github.com/xiaomi/pegasus-java-client) (The most actively-developed) +- [C++](https://github.com/apache/incubator-pegasus/blob/master/src/include/pegasus/client.h) +- [Go](https://github.com/xiaomi/pegasus-go-client) +- [Python](https://github.com/xiaomi/pegasus-python-client) +- [Node.js](https://github.com/xiaomi/pegasus-nodejs-client) +- [Scala](https://github.com/xiaomi/pegasus-scala-client) + +## Contact us + +- Send mails to Apache Pegasus dev mailing list: [email protected]. This is officially where topics around development, community, and problems are discussed. Please remember to subsribe the mail list via [email protected]. Review comment: > This is officially where topics around development, community, and problems are discussed. There is something wrong with this sentence. ########## File path: README.md ########## @@ -40,43 +32,51 @@ Apart from the performance requirements, we also need a storage system to ensure multiple-level data safety and support fast data migration between data centers, automatic load balancing, and online partition split. -After investigating the existing storage systems in the open source world, -we could hardly find a suitable solution to satisfy all the requirements. -So the journey of Pegasus begins. +## Features + +- **Persistence of data**: Each write is replicated three-way to different ReplicaServers before responding to the client. Using PacificA protocol, Pegasus has the ability for strong consistent replication and membership changes. + +- **Automatic load balancing over ReplicaServers**: Load balancing is a builtin function of MetaServer, which manages the distribution of replicas. When the cluster is in an inbalance state, the administrator can invoke a simple rebalance command that automatically schedules the replica migration. + +- **Cold Backup**: Pegasus supports an extensible backup and restore mechanism to ensure data safety. The location of snapshot could be a distributed filesystem like HDFS or local filesystem. The snapshot storing in the filesystem can be further used for analysis based on [pegasus-spark](https://github.com/pegasus-kv/pegasus-spark). + +- **Eventually-consistent intra-datacenter replication**: This is a feature we called *duplication*. It allows a change made in the local cluster accesible after a short time period by the remote cluster. It help achieving higher availability of your service and gaining better performance by accessing only local cluster. ## To start using Pegasus See our documentation on [Pegasus Website][website]. +## Client drivers + +Pegasus has support for serveral languages: + +- [Java](https://github.com/xiaomi/pegasus-java-client) (The most actively-developed) Review comment: I thinsk `The most actively-developed` is unnecessary. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
