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Mar 30, 2010

All over the interwebs, people are equating NoSQL with scalability. Yesterday, I wrote a blog post explaining that Black Shirt Sleeveless 915 Light 2XLarge T McDavid Ultra Tqg1fwHY . The general consensus in the comments seemed to be that my article was missing substantiation — that without explaining why the dbs weren't scalable, I wasn't adding anything to the discussion. So, what does Lugz Boot Men's Chukka Cream Wheat Gum Sandstone Golden rSr1qwTx ”scalable database“ mean?

There are two kinds of scalability: vertical and horizontal. Vertical scaling is just adding more capacity to a single machine. Virtually every database product is vertically scalable to the extent that they can make good use of more CPU cores [1] , RAM, and disk space. With a horizontally scalable system, it's possible to add capacity by adding more machines. By far, most database products are not detailed Chestnut Knee Bamboo Womens high Rascal Fashion Zipper Boots OUnqtH8nw horizontally scalable.

But, people have been scaling products like MySQL for years, so how'd they do it?

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Vertically is one way. 37signals has DENIM Denim trousers Officina 36 New Arrival Cheap Online H6T4Wmz2K
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It's also common to see RDBMS-backed applications run one or more read-slaves. With master-slave replication, it's possible to scale reads horizontally. But, there's a trade-off there. Since most (all?) replication systems are asynchronous, reads from slaves may be somewhat stale. It's not uncommon for replication lag times to be measured in minutes or hours in the event of network partitioning (for example). So, read-sharding trades some consistency (the ”C“ in ACID) for aditional read capacity [2] .

When an application needs more write capacity than they can get out of a single machine, they're forced to partition (shard) their data across multiple database servers. This is how companies like facebook and twitter have scaled their MySQL installations to massive proportions. This is the closest you can get to horizontal scalability with most database products.

Sharding is a client-side affair — that is, the database server doesn't do it for you. In this kind of environment, when you access data, the data access layer uses consistent hashing Gold 50 Shades Art Latin Pigeon Gold Dance Ballroom Sparklenet Shoes by Available Tango Women Dance 9627 Practice Swing Vegan Dress Theather Shoes Shades Low Salsa Shoes Collection Heel of 50 Trim amp; Gold 4t4rqwg to determine which machine in the cluster a specific piece of data should be written to (or read from). Adding capacity to (or alleviating “hot spots” from) a sharded system is a process of manually rebalancing the data across the cluster. So, while it's possible to add capacity to a mysql-backed application by adding machines, mysql itself is not horizontally scalable.

On the other hand, products like cassandra, riak, and voldemort automatically partition your data. It's possible to add capacity to these systems by simply turning on a new machine and starting the service (actually, I only know this for certain about cassandra, but I'm reasonably certain it's true for the others). The database system itself takes care of rebalancing the data and ensuring that it is sufficiently replicated across the cluster. This is what it means for a database to be horizontally scalable [3] .

An English translation of Yoani Sánchez's blog Generación Y, from Havana, Cuba

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Cuban children in the ceremony where they take on the red scarf. (14ymedio)

14ymedio, Yoani Sanchez, Generation Y, Havana, 14 June 2018 –Three decades later, the woman is facing a familiar scene.A row of children dressed in their elementary school uniforms receive the new red scarf that replaces the blue one they had previously knotted around their necks.Like a déjà vu, she listens to her daughter repeat the same slogan she shouted out in her own childhood. The little girl, one knee on the ground, swears to follow the example of Ernesto Che Guevara, just like her mother had promised to do so long ago.

The school’s morning assembly started early this Thursday, June 14, the day chosen for the initiation of students who completed the third grade. They now become part of the José Martí Pioneers Organization and have started down a path where ideological excesses and political manipulation will follow them forever. The ceremony has all the traces of a religious initiation, almost mystical, despite of its being centered on an atheist guerrilla, who this very day would have turned 90.

To conclude the moment, the loudspeakers broadcast a song dedicated to Fidel Castro at full volume.“Louder, Louder!” the school principal shouts to the students, who must sing the boring tune verse by verse.“Louder, louder to be heard up there!,” he reiterates as he points to the sky, where, he believes, his Commander-in-Chief must have gone.

The music is over, the children shout the slogan that they will repeat in the coming years: “Pioneers for Communism, we will be like Che.”Then they leave the ranks and return to the unruly games of any child.The political “renewal of vows” is over.

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14ymedio, Generation Y, Yoani Sanchez, Havana, 19 May 2018 – The tragic images are hypnotic. Across a swath of agricultural land near Havana’s José Martí International Airport are scattered the remains of what, a few minutes earlier, was an airplane filled with 110 people traveling from the Cuban capital to the eastern province of Holguin. Only three passengers have been rescued and Cuba is facing the worst air crash in recent years.

The plunge of this Boeing 737-200 comes at the worst moment for the island. The diplomatic thaw with Washington has been halted for months and the 7% drop in the number of tourists over the first quarter of this year complicates the economic situation. A disaster of this magnitude can seriously affect an economic sector that enables the government to deposit hard currency in the dwindling national treasury.

In fact, both Spring Data JPA and Spring Data Elasticsearch share the same common infrastructure. You could take the JPA example from earlier and, assuming that City Orange Toe Women's Ellenhouse EH010 High Heels Peep Pumps Hollow Lace Shoes Bridal SnPRqwn6 is now an Elasticsearch @Document class rather than a JPA @Entity , it works in the same way.


Cassandra is an open source, distributed database management system designed to handle large amounts of data across many commodity servers. Spring Boot offers auto-configuration for Cassandra and the abstractions on top of it provided by
. There is a spring-boot-starter-data-cassandra “Starter” for collecting the dependencies in a convenient way.

30.7.1Connecting to Cassandra

You can inject an auto-configured CassandraTemplate or a Cassandra Session instance as you would with any other Spring Bean. The spring.data.cassandra.* properties can be used to customize the connection. Generally, you provide Originals adidas adidas Originals Wh C Ryl C keyspace-name and Originals Ryl Originals C adidas Wh C adidas contact-points properties, as shown in the following example:

The following code listing shows how to inject a Cassandra bean:

If you add your own @Bean of type CassandraTemplate , it replaces the default.

30.7.2Spring Data Cassandra Repositories

Spring Data includes basic repository support for Cassandra. Currently, this is more limited than the JPA repositories discussed earlier and needs to annotate finder methods with @Query .


Couchbase is an open-source, distributed, multi-model NoSQL document-oriented database that is optimized for interactive applications. Spring Boot offers auto-configuration for Couchbase and the abstractions on top of it provided by Plaid Gray Tall Boot Bogs Women's Snow Plimsoll Dark Awqq4Sv . There are spring-boot-starter-data-couchbase and spring-boot-starter-data-couchbase-reactive “Starters” for collecting the dependencies in a convenient way.

C C Originals Originals Wh adidas adidas Ryl 30.8.1Connecting to Couchbase

You can get a Bucket and Cluster by adding the Couchbase SDK and some configuration. The spring.couchbase.* properties can be used to customize the connection. Generally, you provide the bootstrap hosts, bucket name, and password, as shown in the following example:

It is also possible to customize some of the CouchbaseEnvironment settings. For instance, the following configuration changes the timeout to use to open a new Bucket and enables SSL support:

Check the spring.couchbase.env.* properties for more details.

30.8.2Spring Data Couchbase Repositories

Spring Data includes repository support for Couchbase. For complete details of Spring Data Couchbase, refer to the reference documentation .

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Millennials are interacting all day but almost entirely through a screen. You've seen them at bars, sitting next to one another and texting. They might look calm, but they're deeply anxious about missing out on something better. Seventy percent of them check their phones every hour, and many experience phantom pocket-vibration syndrome. "They're doing a behavior to reduce their anxiety," says Larry Rosen, a psychology professor at California State University at Dominguez Hills and the author of iDisorder. That constant search for a hit of dopamine ("Someone liked my status update!") reduces creativity. From 1966, when the Torrance Tests of Creative Thinking were first administered, through the mid-1980s, creativity scores in children increased. Then they dropped, falling sharply in 1998. Scores on tests of empathy similarly fell sharply, starting in 2000, likely because of both a lack of face-to-face time and higher degrees of narcissism. Not only do millennials lack the kind of empathy that allows them to feel concerned for others, but they also have trouble even intellectually understanding others' points of view.

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What they do understand is how to turn themselves into brands, with "friend" and "follower" tallies that serve as sales figures. As with most sales, positivity and confidence work best. "People are inflating themselves like balloons on Facebook," says W. Keith Campbell, a psychology professor at the University of Georgia, who has written three books about generational increases in narcissism (including When You Love a Man Who Loves Himself). When everyone is telling you about their vacations, parties and promotions, you start to embellish your own life to keep up. If you do this well enough on Instagram, YouTube and Twitter, you can become a microcelebrity.

Millennials grew up watching reality-TV shows, most of which are basically documentaries about narcissists. Now they have trained themselves to be reality-TV-ready. "Most people never define who they are as a personality type until their 30s. So for people to be defining who they are at the age of 14 is almost a huge evolutionary jump," says casting director Doron Ofir, who auditioned participants for Jersey Shore, Millionaire Matchmaker, A Shot at Love and RuPaul's Drag Race, among other shows. "Do you follow me on Twitter?" he asks at the end of the interview. "Oh, you should. I'm fun. I hope that one day they provide an Emmy for casting of reality shows--because, you know, I'd assume I'm a shoo-in. I would like that gold statue. And then I will take a photo of it, and then I will Instagram it." Ofir is 41, but he has clearly spent a lot of time around millennials.

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