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| <h1 id="Overview">Overview</h1> |
| |
| <p>Apache Pegasus is a distributed key-value storage system which is designed to be:</p> |
| |
| <ul> |
| <li><strong>horizontally scalable</strong>: distributed using hash-based partitioning</li> |
| <li><strong>strongly consistent</strong>: ensured by <a href="https://www.microsoft.com/en-us/research/publication/pacifica-replication-in-log-based-distributed-storage-systems/">PacificA</a> consensus protocol</li> |
| <li><strong>high-performance</strong>: using <a href="https://rocksdb.org/">RocksDB</a> as underlying storage engine</li> |
| <li><strong>simple</strong>: well-defined, easy-to-use APIs</li> |
| </ul> |
| |
| <h2 id="background">Background</h2> |
| |
| <p>Pegasus targets to fill the gap between Redis and <a href="https://hbase.apache.org/">HBase</a>. As the former |
| is in-memory, low latency, but does not provide a strong-consistency guarantee. |
| And unlike the latter, Pegasus is entirely written in C++ and its write-path |
| relies merely on the local filesystem.</p> |
| |
| <p>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.</p> |
| |
| <h2 id="features">Features</h2> |
| |
| <ul> |
| <li> |
| <p><strong>Persistence of data</strong>: 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.</p> |
| </li> |
| <li> |
| <p><strong>Automatic load balancing over ReplicaServers</strong>: 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.</p> |
| </li> |
| <li> |
| <p><strong>Cold Backup</strong>: 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 <a href="https://github.com/pegasus-kv/pegasus-spark">pegasus-spark</a>.</p> |
| </li> |
| <li> |
| <p><strong>Eventually-consistent intra-datacenter replication</strong>: This is a feature we called <em>duplication</em>. 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.</p> |
| </li> |
| </ul> |
| |
| <h2 id="presentations">Presentations</h2> |
| |
| <p>(Incomplete statistics. If you have any new Pegasus related sharing, please feel free to submit a <a href="https://github.com/apache/incubator-pegasus-website/pulls">PR</a>)</p> |
| |
| <ul> |
| <li>2023, Chengdu China, COSCon 2023, <em>How does Apache Pegasus used in SensorsData</em>, Guohao Li (<a href="https://kaiyuanshe.cn/activity/recVnSz8ru/agenda/recAg8mw7f">Intro</a>, <a href="https://www.slideshare.net/acelyc1112009/how-does-apache-pegasusused-in-sensorsdata">Slides</a>)</li> |
| <li>2023, Beijing China, DataFunSummit 2023, <em>The Implementation and Future Planning of Apache Pegasus Application</em>, Yuchen He</li> |
| <li>2022, Beijing China, DataFunSummit 2022, <em>The Design, Implementation, and Open Source Way of Pegasus</em>, Yuchen He (<a href="https://mp.weixin.qq.com/s/rLiwNdl2baCw6m1FoQT4jw">Intro</a>)</li> |
| <li>2022, Beijing China, Pegasus meetup, <em>How does the Apache Pegasus used in Advertising Data Stream in SensorsData</em>, Jiaoming Shi (<a href="https://www.slideshare.net/acelyc1112009/how-does-the-apache-pegasus-used-in-advertising-data-stream-in-sensorsdata">Slides</a>, <a href="https://www.bilibili.com/video/BV1q84y1h7xG/">video</a>)</li> |
| <li>2022, Beijing China, Pegasus meetup, <em>How to continuously improve Apache Pegasus in complex toB scenarios</em>, Hao Wang (<a href="https://www.slideshare.net/acelyc1112009/how-to-continuously-improve-apache-pegasus-in-complex-tob-scenarios">Slides</a>, <a href="https://www.bilibili.com/video/BV1M14y1g7yy/">video</a>)</li> |
| <li>2022, Beijing China, Pegasus meetup, <em>The Construction and Practice of Apache Pegasus in Offline and Online Scenarios Integration</em>, Wei Wang (<a href="https://www.slideshare.net/acelyc1112009/the-construction-and-practice-of-apache-pegasus-in-offline-and-online-scenarios-integration">Slides</a>, <a href="https://www.bilibili.com/video/BV1Ux4y137ib/">video</a>)</li> |
| <li>2022, Beijing China, Pegasus meetup, <em>How does Apache Pegasus used in Xiaomi’s Universal Recommendation Algorithm Framework</em>, Wei Liang (<a href="https://www.slideshare.net/acelyc1112009/how-does-apache-pegasus-used-in-xiaomis-universal-recommendation-algorithm-framework">Slides</a>, <a href="https://www.bilibili.com/video/BV16M411b7Pc/">video</a>)</li> |
| <li>2022, Beijing China, Pegasus meetup, <em>The Introduction of the Apache Pegasus 2.4.0 release</em>, Shuo Jia (<a href="https://www.slideshare.net/acelyc1112009/the-introduction-of-apache-pegasus-240">Slides</a>, <a href="https://www.bilibili.com/video/BV1C8411N7hp/">video</a>)</li> |
| <li>2022, Online, ApacheCon Asia 2022, <em>How does Apache Pegasus (incubating) community develop at SensorsData</em>, Dan Wang, Yingchun Lai (<a href="https://www.slideshare.net/acelyc1112009/how-does-apache-pegasus-incubating-community-develop-at-sensorsdata">Slides</a>, <a href="https://www.bilibili.com/video/BV18v4y1U7RG/">video</a>)</li> |
| <li>2021, Beijing China, System Software Tech Day, <em>Apache Pegasus: A high performance, strong consistent distributed key-value storage system</em>, Yuchen He (<a href="https://www.modb.pro/db/168862">Intro</a>, <a href="https://www.bilibili.com/video/BV1SP4y1p7cW/">video</a>)</li> |
| <li>2021, Beijing China, Pegasus meetup, <em>The Design, Implementation and Open Source Way of Apache Pegasus</em>, Yuchen He (<a href="https://www.slideshare.net/acelyc1112009/the-design-implementation-and-open-source-way-of-apache-pegasus">Slides</a>, <a href="https://www.bilibili.com/video/BV1YL411s7dP/">video</a>)</li> |
| <li>2021, Beijing China, Pegasus meetup, <em>Apache Pegasus’s Practice in Data Access Business of Xiaomi</em>, Fateng Xiao (<a href="https://www.slideshare.net/acelyc1112009/apache-pegasuss-practice-in-data-access-business-of-xiaomi">Slides</a>, <a href="https://www.bilibili.com/video/BV1K44y1t76C/">video</a>)</li> |
| <li>2021, Beijing China, Pegasus meetup, <em>The Advertising Algorithm Architecture in Xiaomi and How does Pegasus Practice in Feature Caching</em>, Gang Hao (<a href="https://www.slideshare.net/acelyc1112009/the-advertising-algorithm-architecture-in-xiaomi-and-how-does-pegasus-practice-in-feature-caching">Slides</a>, <a href="https://www.bilibili.com/video/BV1JR4y1n77B/">video</a>)</li> |
| <li>2021, Beijing China, Pegasus meetup, <em>How do we manage more than one thousand of Pegasus clusters - engine part</em>, Guohao Li (<a href="https://www.slideshare.net/acelyc1112009/how-do-we-manage-more-than-one-thousand-of-pegasus-clusters-engine-part">Slides</a>, <a href="https://www.bilibili.com/video/BV1y44y147U6/">video</a>)</li> |
| <li>2021, Beijing China, Pegasus meetup, <em>How do we manage more than one thousand of Pegasus clusters - backend part</em>, Dan Wang (<a href="https://www.slideshare.net/acelyc1112009/how-do-we-manage-more-than-one-thousand-of-pegasus-clusters-backend-part">Slides</a>, <a href="https://www.bilibili.com/video/BV1Lv411G7aW/">video</a>)</li> |
| <li>2021, Online, ApacheCon Asia 2021, <em>Apache Pegasus (incubating): A distributed key-value storage system</em>, Yuchen He, Shuo Jia (<a href="https://www.slideshare.net/acelyc1112009/apache-pegasus-incubating-a-distributed-keyvalue-storage-system">Slides</a>, <a href="https://www.bilibili.com/video/BV1b3411z7rR/">video</a>)</li> |
| <li>2020, Beijing China, MIDC 2020, <em>Pegasus: Make an open source Key-Value storage system</em>, Tao Wu (<a href="https://zhuanlan.zhihu.com/p/281519769">Intro</a>)</li> |
| <li>2018, Beijing China, MIDC 2018, <em>Pegasus: A distributed Key-Value storage system</em>, Zuoyan Qin</li> |
| <li>2018, Beijing China, <em>Pegasus In Depth</em>, Zuoyan Qin (<a href="https://www.slideshare.net/ssuser0a3cdd/pegasus-in-depth">Slides</a>)</li> |
| <li>2018, Beijing China, <em>Pegasus KV Storage, Let the Users focus on their work</em>, Zuoyan Qin (<a href="https://www.slideshare.net/ssuser0a3cdd/pegasus-kv-storage-let-the-users-focus-on-their-work-201807">Slides</a>)</li> |
| <li>2017, Shenzhen China, ArchSummit, <em>Behind Pegasus, What matters in a Distributed System</em>, Weijie Sun (<a href="https://sz2017.archsummit.com/presentation/969">Intro</a>, <a href="https://www.slideshare.net/ssuser0a3cdd/behind-pegasus-what-matters-in-a-distributed-system-arch-summit-shenzhen2017">Slides</a>)</li> |
| <li>2016, Beijing China, ArchSummit, <em>Pegasus: Designing a Distributed Key Value System</em>, Zuoyan Qin (<a href="http://bj2016.archsummit.com/presentation/3023">Intro</a>, <a href="https://www.slideshare.net/ssuser0a3cdd/pegasus-designing-a-distributed-key-value-system-arch-summit-beijing2016">Slides</a>)</li> |
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| <li><a href="#presentations">Presentations</a></li> |
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