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Hadoop Yarn Tutorial Features, Architecture, High Availability
1. Objective This Yarn tutorial will take you through all the aspects about Apache Yarn like Yarn introduction, Yarn Architecture, Yarn nodes / daemons resource manager and node manager. In this...
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Dynamo：Amazon的高可用性的键-值存储系统
Dynamo是一个分布式键值系统，最初用于支持购物车系统，强调的是提供一个 “永远在线“ 的用户体验。 根据CAP理论不可能同时达到一致性、可用性和分区容忍，于是Dynamo选择了AP，放弃了一致性。 Dynamo在设计时遇到的问题及解决方案（来源大规模分布式存储系统第5章） | 问题 | 采取的技术 | | ――― | ―――――――――――――- | | 数据分布 |...
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Using XRebel with Couchbase
I recently was in Tallinn for a conference called TopConf and a local Docker meetup. And you might think that this doesn’t have much to do with the title of this post but actually it does. Tallinn is...
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Hadoop问题集
1、问题： hadoop安装完以后，在执行命令时，经常会提示一下警告： WARNutil.NativeCodeLoader:Unabletoloadnative-hadooplibraryforyourplatform... usingbuiltin-javaclasseswhereapplicable 原因： 这个跟系统位数有关系，我们平常使用的是Centos 6.5 64位操作系统。 解决办法：...
View ArticleNatural Language Sorting with MongoDB 3.4
London, UK Friday, December 16th 2016, 11:51 GMT Arranging English words in order is simple―most of the time. You simply arrange them in alphabetical order. Sorting a set of German words, or French...
View ArticleRocksDB 4.3.1 发布
RocksDB 4.3.1 发布了。 新特性： CompactionFilter has new member function called IgnoreSnapshots which allows CompactionFilter to be called even if there are snapshots later than the key. RocksDB will now...
View ArticleUpdating Multiple Documents With PouchDB
In SQL, updating multiple documents is as easy as writing an UPDATE statement. And, not only can you update multiple documents, you can even perform updates across complex INNER JOIN statements . In a...
View ArticleMongoDB权威指南第二版学习笔记―增删改文档上
插入insert 单条插入 > db.foo.insert({"bar":"baz"})WriteResult({ "nInserted" : 1 }) 批量插入 > db.foo.insert([{"_id":1},{"_id":2},{"_id":3}])BulkWriteResult({ "writeErrors" : [ ], "writeConcernErrors" : [...
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Neo4j is your RDF store (part 2)
As in previous posts, for those of you less familiar with the differences and similarities between RDF and the Property Graph, I recommend you watch this talk I gave at Graph Connect San Francisco in...
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RocksDB 4.6.0 发布，Key-Value 存储系统
RocksDB 4.6.0 发布了，RocksDB 是一个来自 facebook 的可嵌入式的支持持久化的 key-value 存储系统，也可作为 C/S 模式下的存储数据库，但主要目的还是嵌入式。RocksDB 基于LevelDB 构建。关于 RocksDB 的 性能说明 。 改进日志： Change default of...
View ArticleUsing Rep to test, benchmark, and experiment with CouchDB and IBM Cloudant
Rep is the interactive tool bench component in CouchDyno and is probably the most fun one to play with. Initially, Rep started with an assortment of python scripts to create replication scenarios. Some...
View Article码云推荐|基于 HapiJS+ReactJS 的前后端同构样板
Hapi React Isomorphic Boilerplate 基于 HapiJS + ReactJS 的前后端同构系统样板 开始你的新项目 说明 项目使用了 Redis 为系统提供缓存服务， Session 依赖于该服务 项目推荐使用 MongoDB 作为数据库系统 若不需要以上数据库服务，请在相应的配置文件中关闭相关的设置，然后还需要更新 server.js 中...
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MongoDB PIT Backups In Depth
In this blog is an in-depth discussion of MongoDB PIT backups. Note : INTIMIDATION FREE ZONE !! This post is meant to give the reader most of the knowledge that is needed to understand the material....
View ArticleHow Thumbtack Engineering Built Its Model Serving System in Scala
By: Xin Liu When we built our first machine learned model in Spark to predict pros’ interests in customer requests, we loaded pros’ historical engagement features directly into an online Golang...
View ArticleUsing MongoDB $indexStats to identify and remove unused indexes
Available for Dedicated plans on mLab Proper indexing plays an important role in ensuring optimal database performance. While it is considered good practice to ensure that all queries are indexed, a...
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2016 Last Minute DBA Holiday Gift Guide
Do you have a hard-to-buy-for DBA on your list? Whether you’re a manager looking for something to give your talented people, or someone with a special DBA in your life, we know it’s not always easy to...
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使用技术手段限制DBA的危险操作―Oracle Database Vault
概述 众所周知，在业务高峰期，某些针对Oracle数据库的操作具有很高的风险，比如修改表结构、修改实例参数等等，如果没有充分评估和了解这些操作所带来的影响，这些操作很可能会导致故障，轻则导致应用错误，重则导致数据库服务不可用。 另外，在非业务高峰期，某些看似风险不大的操作也可能会导致严重后果，比如不按管理流程修改表结构，如果这个表正好是Oracle...
View ArticleCreating A PouchDB Plugin For Bulk Document Updates
Yesterday, I looked at how to update multiple documents in a PouchDB database . Unlike in SQL, where we can run arbitrary UPDATE statement, in a document database like PouchDB, we have to fetch the...
View ArticleDataWorks Summit and Hadoop Summit Registration is OPEN!
As you may have readyesterday, we are expanding Hadoop Summit to address the growing ecosystem to bring you DataWorks Stummit. DataWorks Summit and Hadoop Summit are global events for business and...
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