Project Spotlight: HR Assistant
Last year OpenNTF jointly hosted an ICS development contest with IBM with a difference: there had to be a team involved. The winners were Frank van der Linden and Frederic Dehedin. The application...
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Cherry Mobile Flare J2s gets discounted price for Chinese New Year
Cherry Mobile has announced that it will be having a sale of the Flare J2s during Chinese New Year, allowing you to purchase it at a discounted price. Cherry Mobile Flare J2sspecs: 5-inch HD display...
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Scaling exactEarth’s satellite vessel-tracking service using GeoMesa on...
By Anthony Fox, Director of Data Science & System Architecture at CCRi, and Misha Brukman, Product Manager for Google Cloud Bigtable Google Cloud Bigtable, Google Cloud Dataproc and GeoMesa are the...
View Articleredis-4.0 非阻塞删除
对于 Redis 这种单线程模型的服务来说，一些耗时的命令阻塞其他请求是个头痛的问题。典型的命令如 KEYS/FLUSHALL/FLUSHDB 等等，一般线上也会禁用这些会遍历整个库的命令。而像 DEL/LRANGE/HGETALL 这些可能导致阻塞的命令经常被工程师忽视，这些命令在 value 比较大的时候跟 KEYS 这些并没有本质区别。 Redis 4.0 开始针对...
View ArticleTransferring Data From Cassandra to Couchbase Using Spark
Shivansh Srivastava is a polyglot developer and a Scala ,Spark aficionado He likes to contribute to Open Source projects, and has contributed to many projects like, Apache Iota, Apache Spark, Apache...
View ArticleRedis-4.0 混合持久化
Redis 当前支持 aof 和 rdb 这两种持久化方式。 有些对 Redis 不是特别的了解同学误解持久化是读写数据也会到磁盘。这里辟谣一下: Redis 读写都是全内存的, 持久化数据只是作为磁盘备份, 实例重启或者机器断电的时候可以从磁盘加载到内存 由于本篇博客主要是为了分析 4.0 版本的 rdb 和 aof 混合存储的实现，所以不会详细介绍 rdb 和 aof。如果有想进一步了解可参考...
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Couchbase Cluster using Docker
Docker Swarm and ServiceMode to create Couchbase Cluster explained how to create a Couchbase Cluster using Docker. It used the concept of a "master" and a "worker" service to simplify and automate the...
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The Nested Set Model++
Since myfirst post on this topic got a lot of attention and traction, I felt it appropriate to expand on the topic a bit, even if it’s been largely covered by other bloggers in the past. I’ve also...
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How To Build Planet Scale Mobile App in Minutes with Xamarin and DocumentDB
Most mobile apps need to store data in the cloud, andAzure DocumentDB is an awesome cloud database for mobile apps. It has everything a mobile developer needs, a fully managed NoSQL database as a...
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DB Ransom Attacks Spread to CouchDB and Hadoop
The ransomeware attacks that began around Christmas, first hitting MongoDB and then ElasticSearch clusters, last week again broadened to now include both CouchDB and Hadoop servers. The attacks on...
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Redis中BitMap是如何储存的，以及PHP如何处理
setbit,getbit这些命令在redis是如何储存和获取的呢？直接通过get获取到的值我们如何判断对应的位是0或者1？ 本编文章可以看为 [Redis中BitMap的妙用] 的续篇。 在Redis中 setbit , set , getbit , get 这些命令本身都是对字符串(SDS)的操作。 当我们执行 setbit key (0,2,5,9,12,16,21) 1...
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Reliable Collections
Reliable Collections enable you to write highly available, scalable, and low-latency cloud applications as though you were writing single computer applications. The classes in the...
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Dynamically Loading Markers with MongoDB in Ionic 2 Part 1
In this tutorial series, we are going to cover how to dynamically load markers from a server and add them to a Google Map in Ionic 2. When dealing with a small number of markers it isn’t a big deal to...
View ArticleOffline-first web and mobile apps: Top frameworks and components
Offline-first is a fairly straightforward concept on the surface, yet implementation of Offline-first apps canpresentmany challenges. Fortunately, there are a variety of tools available to...
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RethinkDB is dead, and MongoDB isn't what killed it
Image: iStockphoto/marcogarrincha In a thoughtful and unsparing post, RethinkDB founder Slava Akhmechet used 2,598 words to detail the reasons for the open source database startup's ultimate decline....
View ArticleCouchDB Ransom Notes
Dear CouchDB Community, You may have seen a news item[1] about CouchDB in the past few days. There is a trend of finding unsecured public databases, deleting all the data in them, and asking for a...
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DBMS Attacks Target CouchDB and Hadoop Deployments
For the past week, unknown groups of cyber-criminals have taken control of and wiped data from CouchDB and Hadoop databases, in some cases asking for a ransom fee to return the stolen files, but in...
View ArticleMongoDB Performance: Running MongoDB Map-Reduce Operations On Secondaries
Map-reduce is perhaps the most versatile of the aggregation operations that MongoDB supports. Map-Reduce is a popular programming model that originated at Google for processing and aggregating large...
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Building Instant RESTFul API's with MongoDB and RESTHeart
When you need to turn your Mongo database into a RESTFul API, RESTHeart can get you up-and-running quickly. In this article, we'll explore using RESTHeart to expose a RESTFUL API directly from a Mongo...
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