Get E•MO•TION on iTunes now: http://smarturl.it/E-MO-TION Sign up for Carly Rae Jepsen news here: http://smarturl.it/CRJ.News Music video by Carly Rae Jepsen performing Call Me Maybe. (C) 2011 604 Records Inc. #VEVOCertified on June 8, 2012. http://www.youtube.com/vevocertified
Spring BootによるAPIバックエンド構築実践ガイド 第2版 何千人もの開発者が、InfoQのミニブック「Practical Guide to Building an API Back End with Spring Boot」から、Spring Bootを使ったREST API構築の基礎を学んだ。この本では、出版時に新しくリリースされたバージョンである Spring Boot 2 を使用している。しかし、Spring Boot3が最近リリースされ、重要な変...
Check out the official music video for "Good Time' by Owl City & Carly Rae Jepsen Pre-order E•MO•TION on iTunes & get 5 tracks instantly! Available August 21st: http://smarturl.it/E-MO-TION Music video by Owl City & Carly Rae Jepsen performing Good Time. © 2012 School Boy/Interscope Records © 2012 604 Records for Canada only Best of Owl City: https://goo.gl/mSDwW7 Subscribe here: https://goo.g
People keep asking why Jepsen is written in Clojure, so I figure it’s worth having a referencable answer. I’ve programmed in something like twenty languages. Why choose a Weird Lisp? Jepsen is built for testing concurrent systems–mostly databases. Because it tests concurrent systems, the language itself needs good support for concurrency. Clojure’s immutable, persistent data structures make it eas
Previously on Jepsen, we explored two-phase commit in Postgres. In this post, we demonstrate Redis losing 56% of writes during a partition. Redis is a fantastic data structure server, typically deployed as a shared heap. It provides fast access to strings, lists, sets, maps, and other structures with a simple text protocol. Since it runs on a single server, and that server is single-threaded, it o
Previously, on Jepsen, we reviewed Elasticsearch’s progress in addressing data-loss bugs during network partitions. Today, we’ll see Aerospike 3.5.4, an “ACID database”, react violently to a basic partition. [Update, 2018-03-07] See the followup analysis of 3.99.0.3 Aerospike is a high-performance, distributed, schema-less, KV store, often deployed in caching, analytics, or ad tech environments. I
GitHub - jepsen-io/jepsen: A framework for distributed systems verification, with fault injection
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Get E•MO•TION on iTunes now: http://smarturl.it/E-MO-TION Sign up for Carly Rae Jepsen news here: http://smarturl.it/CRJ.News ©2015 School Boy/Interscope ©2015 604 Records for Canada only.
Carly Rae Jepsen - This Kiss
Get E•MO•TION on iTunes now: http://smarturl.it/E-MO-TION Sign up for Carly Rae Jepsen news here: http://smarturl.it/CRJ.News Music video by Carly Rae Jepsen performing This Kiss. (C) 2012 School Boy/Interscope Records/604 Records Inc.
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Previously in Jepsen, we discussed Redis. In this post, we’ll see MongoDB drop a phenomenal amount of data. See also: followup analyses of 2.6.7 and 3.4.0-rc3. MongoDB is a document-oriented database with a similar distribution design to Redis. In a replica set, there exists a single writable primary node which accepts writes, and asynchronously replicates those writes as an oplog to N secondaries
Please note: our followup analysis of 3.4.0-rc3 revealed additional faults in MongoDB’s replication algorithms which could lead to the loss of acknowledged documents–even with Majority Write Concern, journaling, and fsynced writes. In May of 2013, we showed that MongoDB 2.4.3 would lose acknowledged writes at all consistency levels. Every write concern less than MAJORITY loses data by design due t
カーリー・レイ・ジェプセン | CARLY RAE JEPSEN - UNIVERSAL MUSIC JAPAN
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This post covers Elasticsearch 1.1.0. In the months since its publication, Elasticsearch has added a comprehensive overview of correctness issues and their progress towards fixing some of these bugs. Previously, on Jepsen, we saw RabbitMQ throw away a staggering volume of data. In this post, we’ll explore Elasticsearch’s behavior under various types of network failure. Elasticsearch is a distribut
View the full interactive version of "Runaway With Me" here! https://www.carlyraemusic.com/runawaywithme Get E•MO•TION on iTunes now: http://smarturl.it/E-MO-TION Sign up for Carly Rae Jepsen news here: http://smarturl.it/CRJ.News © 2015 School Boy/Interscope Records © 2015 604 Records for Canada only http://vevo.ly/JVW9AJ
Previously, on Jepsen, we demonstrated stale and dirty reads in MongoDB. In this post, we return to Elasticsearch, which loses data when the network fails, nodes pause, or processes crash. Nine months ago, in June 2014, we saw Elasticsearch lose both updates and inserted documents during transitive, nontransitive, and even single-node network partitions. Since then, folks continue to refer to the
RabbitMQ is a distributed message queue, and is probably the most popular open-source implementation of the AMQP messaging protocol. It supports a wealth of durability, routing, and fanout strategies, and combines excellent documentation with well-designed protocol extensions. I’d like to set all these wonderful properties aside for a few minutes, however, to talk about using your queue as a lock
People keep asking why Jepsen is written in Clojure, so I figure it’s worth having a referencable answer. I’ve programmed in something like twenty languages. Why choose a Weird Lisp? Jepsen is built for testing concurrent systems–mostly databases. Because it tests concurrent systems, the language itself needs good support for concurrency. Clojure’s immutable, persistent data structures make it eas
[As of February 23, 2017, CockroachDB Beta Passed Jespen Testing] We at Cockroach Labs absolutely love Aphyr’s work. We are avid readers of the Jepsen series – which some know as a high quality review of the correctness and consistency claims of modern database systems, but which we really know as “Aphyr’s hunting tales about the highest profile bugs in our industry.” Most of us read each new blog
Spring BootによるAPIバックエンド構築実践ガイド 第2版 何千人もの開発者が、InfoQのミニブック「Practical Guide to Building an API Back End with Spring Boot」から、Spring Bootを使ったREST API構築の基礎を学んだ。この本では、出版時に新しくリリースされたバージョンである Spring Boot 2 を使用している。しかし、Spring Boot3が最近リリースされ、重要な変...
Chronos is a distributed task scheduler (cf. cron) for the Mesos cluster management system. In this edition of Jepsen, we’ll see how simple network interruptions can permanently disrupt a Chronos+Mesos cluster Chronos relies on Mesos, which has two flavors of node: master nodes, and slave nodes. Ordinarily in Jepsen we’d refer to these as “primary” and “secondary” or “leader” and “follower” to avo
More videos on http://www.off.tv Like us on Facebook http://po.st/KKmN8j Follow us on Twitter http://po.st/AuU774 Music video by Carly Rae Jepsen performing Tug Of War. (C) 2013 OFF TV / Interscope / 604 Records Inc.
In a recent blog post, antirez detailed a new operation in Redis: WAIT. WAIT is proposed as an enhancement to Redis’ replication protocol to reduce the window of data loss in replicated Redis systems; clients can block awaiting acknowledgement of a write to a given number of nodes (or time out if the given threshold is not met). The theory here is that positive acknowledgement of a write to a majo
This article is part of Jepsen, a series on network partitions. We’re going to learn about distributed consensus, discuss the CAP theorem’s implications, and demonstrate how different databases behave under partition. Modern software systems are composed of dozens of components which communicate over an asynchronous, unreliable network. Understanding the reliability of a distributed system’s dynam
This article is part of Jepsen, a series on network partitions. We’re going to learn about distributed consensus, discuss the CAP theorem’s implications, and demonstrate how different databases behave under partition. Modern software systems are composed of dozens of components which communicate over an asynchronous, unreliable network. Understanding the reliability of a distributed system’s dynam
More videos on http://www.off.tv Like us on Facebook http://po.st/KKmN8j Follow us on Twitter http://po.st/AuU773 Music video by Carly Rae Jepsen performing Call Me Maybe. (C) 2012 OFF TV / School Boy / Interscope Records
Get E•MO•TION on iTunes now: http://smarturl.it/E-MO-TION Sign up for Carly Rae Jepsen news here: http://smarturl.it/CRJ.News Music video by Carly Rae Jepsen performing Tonight I'm Getting Over You. © 2012 School Boy/Interscope Records © 2012 604 Records for Canada only Buy Now: http://smarturl.it/CarlyKiss
Jimmy Fallon, Carly Rae Jepsen & The Roots Sing "Call Me Maybe" (w/ Classroom Instruments)
"Music Room": Backstage before the show, Jimmy, Carly Rae Jepsen, and The Roots grabbed some instruments you'd find in an elementary school classroom and performed "Call Me Maybe." Carly Rae Jepsen - vocals, triangle Jimmy Fallon - wood block, tambourine, bass drum Questlove - washboard stick, kazoo, recorder Tuba Gooding Jr. - kazoo, recorder Frank Knuckles - bongos Captain Kirk - ukulele James
Get “Cut To The Feeling” now. http://smarturl.it/CutToTheFeeling Watch the official video here: http://smarturl.it/CTTFVideo Sign up for Carly Rae Jepsen news here: http://smarturl.it/CRJ.News © 2017 School Boy/Interscope © 2017 604 Records for Canada only Music video by Carly Rae Jepsen performing Cut To The Feeling. (C) 2017 School Boy/Interscope Records http://vevo.ly/0oh4iN
In the last Jepsen post, we learned about NuoDB. Now it’s time to switch gears and discuss Kafka. Up next: Cassandra. Kafka is a messaging system which provides an immutable, linearizable, sharded log of messages. Throughput and storage capacity scale linearly with nodes, and thanks to some impressive engineering tricks, Kafka can push astonishingly high volume through each node; often saturating
In the previous post, we discovered the potential for data loss in RabbitMQ clusters. In this oft-requested installation of the Jepsen series, we’ll look at etcd: a new contender in the CP coordination service arena. We’ll also discuss Consul’s findings with Jepsen. Like Zookeeper, etcd is designed to store small amounts of strongly-consistent state for coordination between services. It exposes a
Hazelcast is a distributed in-memory data grid, providing shared data structures for distributed systems. We show that many of Hazelcast’s distributed data structures are unsafe in the presence of network partitions: updates to maps can be lost, unique IDs may not be unique, atomic objects are not atomic, locks aren’t exclusive, and queues can forget about enqueued elements. Stale and dirty reads
Previously on Jepsen, we explored two-phase commit in Postgres. In this post, we demonstrate Redis losing 56% of writes during a partition. Redis is a fantastic data structure server, typically deployed as a shared heap. It provides fast access to strings, lists, sets, maps, and other structures with a simple text protocol. Since it runs on a single server, and that server is single-threaded, it o
カナダのアーティスト。2012年に発売されるアルバム「Curiosity」から。Carly Rae Jepsen - Call Me Maybe
Aerospike is a high-performance distributed document store. Following up on our 2015 analysis, we explored Aerospike’s new strong-consistency mode, which offers linearizable operations on single records. We confirmed two documented flaws in Aerospike’s homegrown replication algorithm. First, it can lose updates when more than k nodes crash (either concurrently or in sequence). Second, when either
In this Jepsen report, we’ll verify RethinkDB’s support for linearizable operations using majority reads and writes, and explore assorted read and write anomalies when consistency levels are relaxed. This work was funded by RethinkDB, and conducted in accordance with the Jepsen ethics policy. RethinkDB is an open-source, horizontally scalable document store. Similar to MongoDB, documents are hiera
Get E•MO•TION on iTunes now: http://smarturl.it/E-MO-TION Sign up for Carly Rae Jepsen news here: http://smarturl.it/CRJ.News
Redis is a popular in-memory data structure server. Historically, Redis has supported a number of ad hoc replication mechanisms, but none guaranteed stronger than causal consistency. Redis-Raft aims to bring strict serializability to Redis by means of the Raft consensus algorithm. We found twenty-one issues in development builds of Redis-Raft, including partial unavailability in healthy clusters,
The etcd key-value store is a distributed database based on the Raft consensus algorithm. In our 2014 analysis, we found that etcd 0.4.1 exhibited stale reads by default. We returned to etcd, now at version 3.4.3, to investigate its safety properties in detail. We found that key-value operations appear to be strict serializable, and that watches deliver every change to a key in order. However, etc
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Carly Rae Jepsen - Call Me Maybe
Jepsen: PostgreSQL, Redis, MongDB および Riak の分割耐性をテストする
Owl City & Carly Rae Jepsen - Good Time (Official Video)
Tag: Jepsen
Jepsen: Redis
Jepsen: Aerospike
Carly Rae Jepsen - I Really Like You
Call Me Maybe - Carly Rae Jepsen (Chatroulette Version)
Jepsen: MongoDB
Jepsen: MongoDB stale reads
Jepsen: Elasticsearch
Carly Rae Jepsen - Run Away With Me
Jepsen: Elasticsearch 1.5.0
Jepsen: RabbitMQ
Tag: Jepsen
DIY Jepsen testing CockroachDB
JepsenがMongoDBのデータ整合性の主張に異議を唱える
Jepsen: Chronos
Carly Rae Jepsen - OFF SESSION - Tug Of War
Jepsen: Redis redux
Jepsen: On the perils of network partitions
Jepsen: On the perils of network partitions
Carly Rae Jepsen - OFF SESSION - Call Me Maybe
Carly Rae Jepsen - Tonight I'm Getting Over You
Carly Rae Jepsen - Cut To The Feeling (Audio)
Jepsen: Kafka
Jepsen: etcd and Consul
Jepsen: Hazelcast 3.8.3
Jepsen: Redis
Carly Rae Jepsen - Call Me Maybe
Jepsen: Aerospike 3.99.0.3
Jepsen: RethinkDB 2.1.5
Carly Rae Jepsen - All That (Audio)
Jepsen: Redis-Raft 1b3fbf6
Jepsen: etcd 3.4.3