QArea Joins the IT Ukraine Association | QArea Blog

Earlier this month, our company became an official member of the IT Ukraine Association. This opens up opportunities to share knowledge, network, and have a more direct input into the development of IT companies in Ukraine.

Over the 18 years of QArea’s presence in the global IT market, it has become increasingly clearer that creating and maintaining Ukraine’s reputation as a country with highly qualified development and testing experts is a joint effort. We hope that our participation in the IT Ukraine Association will help us reinforce this reputation and make a more direct contribution to it.

“I believe that a rising tide lifts all boats, so joining a tight knit community that strives to improve the IT industry in Ukraine is an obvious step in the right direction,” says Maxim Garkavtsev, president and co-founder of QArea. “I’m looking forward to discovering the many opportunities that will present themselves this upcoming year.”

QArea has steadily been focusing on solidifying the fundamentals of successful provision of IT services. In 2018 our team was appraised at CMMI-Dev Level 3. Earlier this year we received an ISO 27001 certification. In the coming years we plan to continue this trend and use our experience and knowledge to make positive contributions in the IT Ukraine Association and the local technological field in general.

About IT Ukraine Association

The association was established in 2004 by leaders in the field of information technology — Miratech, Mirasoft, ProFIX, Ukrsoft, and others. Since then it has become the largest association of companies providing IT services both within Ukraine and globally. As of today the association consists of 58 companies that collectively bring in over 50% of revenue in the IT sphere in Ukraine.

# IT Ukraine #development #outsourcing

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QArea Joins the IT Ukraine Association | QArea Blog
Brad  Hintz

Brad Hintz

1599302760

Apache Spark’s Join Algorithms

One of the most frequently used transformations in Apache Spark is Join operation. Joins in Apache Spark allow the developer to combine two or more data frames based on certain (sortable) keys. The syntax for writing a join operation is simple but some times what goes on behind the curtain is lost. Internally, for Joins Apache Spark proposes a couple of Algorithms and then chooses one of them. Not knowing what these internal algorithms are, and which one does spark choose might make a simple Join operation expensive.

While opting for a Join Algorithm, Spark looks at the size of the data frames involved. It considers the Join type and condition specified, and hint (if any) to finally decide upon the algorithm to use. In most of the cases, Sort Merge join and Shuffle Hash join are the two major power horses that drive the Spark SQL joins. But if spark finds the size of one of the data frames less than a certain threshold, Spark puts up Broadcast Join as it’s top contender.

Broadcast Hash Join

Looking at the Physical plan of a Join operation, a Broadcast Hash Join in Spark looks like this

Joins in Apache Spark: Broadcast Join

The above plan shows that the data frame from one of the branches broadcasts to every node containing the other data frame. In each node, Spark then performs the final Join operation. This is Spark’s per-node communication strategy.

Spark uses the Broadcast Hash Join when one of the data frame’s size is less than the threshold set in spark.sql.autoBroadcastJoinThreshold. It’s default value is 10 Mb, but can be changed using the following code

spark.conf.set("spark.sql.autoBroadcastJoinThreshold", 100 * 1024 * 1024)

This algorithm has the advantage that the other side of the join doesn’t require any shuffle. If this other side is very large, not doing the shuffle will bring notable speed-up as compared to other algorithms that would have to do the shuffle.

Broadcasting large datasets can also lead to timeout errors. A configuration spark.sql.broadcastTimeout sets the maximum time that a broadcast operation should take, past which the operation fails. The default timeout value is 5 minutes, but it can be set as follows:

spark.conf.set("spark.sql.broadcastTimeout", time_in_sec)

Sort Merge Join

If neither of the data frames can be broadcasted, then Spark resorts to Sort Merge Join. This algorithm uses the node-node communication strategy, where Spark shuffles the data across the cluster.

Sort Merge Join requires both sides of the join to have correct partitioning and order. Generally, this is ensured by** shuffle and sort** in both branches of the join as depicted below

#apache spark #scala #tech blogs #broadcast join #join opertaions #join optimization #joins in spark #shuffled hash join #sort merge join

QArea Joins the IT Ukraine Association | QArea Blog

Earlier this month, our company became an official member of the IT Ukraine Association. This opens up opportunities to share knowledge, network, and have a more direct input into the development of IT companies in Ukraine.

Over the 18 years of QArea’s presence in the global IT market, it has become increasingly clearer that creating and maintaining Ukraine’s reputation as a country with highly qualified development and testing experts is a joint effort. We hope that our participation in the IT Ukraine Association will help us reinforce this reputation and make a more direct contribution to it.

“I believe that a rising tide lifts all boats, so joining a tight knit community that strives to improve the IT industry in Ukraine is an obvious step in the right direction,” says Maxim Garkavtsev, president and co-founder of QArea. “I’m looking forward to discovering the many opportunities that will present themselves this upcoming year.”

QArea has steadily been focusing on solidifying the fundamentals of successful provision of IT services. In 2018 our team was appraised at CMMI-Dev Level 3. Earlier this year we received an ISO 27001 certification. In the coming years we plan to continue this trend and use our experience and knowledge to make positive contributions in the IT Ukraine Association and the local technological field in general.

About IT Ukraine Association

The association was established in 2004 by leaders in the field of information technology — Miratech, Mirasoft, ProFIX, Ukrsoft, and others. Since then it has become the largest association of companies providing IT services both within Ukraine and globally. As of today the association consists of 58 companies that collectively bring in over 50% of revenue in the IT sphere in Ukraine.

# IT Ukraine #development #outsourcing

Tyrique  Littel

Tyrique Littel

1603587600

How To Create a Developer Blog on DevDojo

Nowadays, creating a blog is easy. But, with all the different options available, you might go crazy by just doing the research.

Should you choose WordPress and tweak the theme to get it the way you like, or a static site generator with no admin interface and complicated build processes?

All you want is a simple blog where you can write about the shit you love.

So why can’t it be simpler? Well, now it is with the DevDojo Dev Blog!

Setting up a Domain

Your Dev Blog will have a default subdomain username.devdojo.com, and you may choose to add a custom domain as well.

If you wish to use a custom domain, add a CNAME record to your Cloudflare DNS, with your subdomain in the CONTENT section. Wait a few minutes and you’ll have your custom domain resolving in minutes.

Want a video on how to do this, You got it!

Themes

At the moment of writing this, there are 2 themes you can choose from (many more to come). Each theme will have a light/dark mode and is built for speed!

Themes are built using the awesome TailwindCSS library. If you pair that with PurgeCSS, minimal javascript, and Cloudflare caching. That’s just a recipe for a fast website.

#developer-blog #dev-blog #web-development #portfolio #blog #blogging #developer-tools #writing

How Do I Pass the AWS Solutions Architect Associate Exam? Careerera

The AWS solutions architect associate exam is one of the most difficult certification exams in the world. There are many certifications for various things such as the PMP certification and the CISSP certification, but it is the AWS solutions architect associate exam which takes the crown when it comes to difficulty.

How to Qualify an AWS Certified Solutions Architect Associate Exam?

Naturally, given the difficulty of the exam many people wonder, “How Do I Pass the AWS Solutions Architect Associate Exam?” on the first attempt. This is a very valid question and, in this article, we will discuss all the ways in which one can maximize his chances of passing the AWS solutions architect associate exam in the first attempt.

Before starting we must remember one thing – the AWS platform is a beast of a platform and is vast beyond comprehension. So, for a beginner looking to take the AWS solutions architect associate exam it will not be possible to cover all the topics and services related to the AWS platform.

However, one can make one’s best attempt to cover all the core concepts and topics which are most relevant and pertinent to the AWS platform. A candidate for the AWS solutions architect associate exam in particular should keep himself updated on all the most recent advances and developments in the field of AWS.

Which services are tested most frequently on the exam?

  1. Amazon EC2 -

This service is used to create virtual machines which are offsite. It is also used to manage things such as ports, security, and storage because of its many features. It allows the users to utilize AWS’ vast computing capabilities on-demand. With a ‘scale as you grow’ philosophy the user is not trapped into an agreement in which they will have to purchase excessive resources from Amazon.
They only have to make use of as many resources as they need. The Amazon EC2 web interface allows the software developers to configure and resize the compute machines to their heart’s content with minimal friction and absolutely no confusion whatsoever. All decent AWS Solutions Architect Associate Certification courses teach how to make use of this service.

  1. Amazon RDS -

The full form of Amazon RDS is Amazon Relational Database Service. It is an extremely useful service launched by Amazon. It is used by software developers to create a database with all the features of a full-fledged offline database in a matter of minutes.

The main purpose of Amazon RDS is to set up relational databases in the cloud. These databases can be set up, operated, and scaled very easily and very smoothly. Amazon provides a very seamless and slick interface which is ideal for operating the databases thus created.

The databases are very cost-effective and can be resized very easily. They provide all facilities to carry out administrative tasks such as hardware provisioning, database setup, patching and backups. With the help of these databases, one will be able to give their applications fast performance, high availability, security and compatibility.

  1. Amazon S3 -

The full form of Amazon S3 is Amazon Simple Storage Service. It is a service which provides a lot of expediency to software developers in the matter of storage. Software developers can create objects through programming and they can then store those objects which they have coded into the Amazon S3 service.

This service is responsible in a large part for having made AWS the leading cloud services provider in the world. Truly Jeff Bezos must have been inspired by a divine vision when he conceived of this service. This service leads the industry in terms of scalability, data availability, security, and performance.

How difficult is the AWS solutions architect associate exam?

As we have mentioned before, the AWS platform is vast beyond comprehension. It contains multitudes of services and all of them have their own various configuration options and switches. This means that for a candidate who is just starting his journey of becoming a AWS certified solution architect associate it is not possible to master the whole platform immediately.

It will take many years and a lot of practical and hands-on experience before he is able to do so. But the AWS solutions architect associate exam has a very extensive syllabus and is thus prohibitively difficult for the candidates. Its syllabus contains the following domains of knowledge -

• Design Resilient Architectures - 34%
• Define Performant Architecture – 24%
• Specify Secure Applications and Architectures – 24%
• Design Cost-Optimized Architectures – 10%
• Define Operationally Excellent Architectures – 8%

Some tips which will help to clear the exam -

  1. Read as many AWS whitepapers as possible -

The AWS whitepapers explain many core concepts of the AWS platform in very technical, precise, and accurate language. For a candidate preparing for the AWS solutions architect associate exam, it is very beneficial to read the whitepapers as they will illuminate many technical and hard to grasp concepts of the AWS platform in a detailed and scientific way.

  1. Make use of the process of elimination for multiple correct answers -

On the AWS solutions architect associate exam there will be many questions which will have multiple options. For those questions the candidate should first try to identify and eliminate the incorrect options so that they have to contemplate a fewer number of options while trying to find the correct answer.

  1. Try to spot questions which have hints and details about other questions -

Many times, there will be questions on the exam which will contain hints and details pertinent to other questions on the exam. So, the candidate should keep a weather eye out for such questions and read all questions carefully with this aspect of the exam kept in mind firmly. This trick is taught in many AWS Solutions Architect Associate Certification courses.

  1. Take an AWS solution architect associate course -

The best way to pass the AWS solutions architect associate exam is to take an AWS solution architect associate course. This will help the candidate because they will be studying under the guidance of seasoned and experienced instructors who will be able to bring their world-class teaching skills and subject matter expertise to bear to make the learners fully prepared for the exam.

#how do i pass the aws solutions architect associate exam #how to qualify an aws certified solutions architect associate exam #aws solutions architect associate exam #aws solutions architect associate certification courses #aws certified solution architect associate #aws solution architect associate course

Karlee  Will

Karlee Will

1621561800

Your Ultimate Guide to SQL Join: CROSS JOIN

CROSS JOIN is in the spotlight. This article finishes our small series of SQL JOIN-related publications.

SQL Server CROSS JOIN is the simplest of all joins. It implements a combination of 2 tables without a join condition. If you have 5 rows in one table and 3 rows in another, you get 15 combinations. Another definition is a Cartesian Product.

Now, why would you want to combine tables without a join condition? Hang on a bit because we are getting there. First, let’s refer to the syntax.

#sql server #cross join #inner join #outer join #sql join #sql