Is a knowledge of Hadoop required to learn Spark?

Is a knowledge of Hadoop required to learn Spark?

You need to understand some basic differences between hadoop and spark.

One of the major difference is file system. Hadoop has HDFS while spark does not have any native file system associated with it.

So, you can run spark without hadoop in theory., but you need something to handle data. HDFS is one of the best choice for this task, in that case, you need to know the basic of Hadoop to get good results from Spark.…

Why do we use a token concept in PHP?

Why do we use a token concept in PHP?

Question is not specific to PHP only, it is generic for Web development, language will not matter.

PHP has session tokens through which server will identify the session id of a specific user, (this is similar to many other languages). These tokens can be sent via cookies or via embedding in urls. In terms CSRF attacks, urls one are much better but these also expose many other security issues as token is embedded automatically (if you did not change your ini settings) to urls.…

Devops for QA : Is programming required?

Devops for QA : Is programming required?

Recently I got this query

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I am working as a Testing team lead in manual testing so i don’t have a programming knowledge. Now, I want to learn DevOps. Before join in this course i want to clarify my doubts.

1. Is it possible to learn as a manual tester because I don’t have a programming knowledge?

2. Do I need to write or implement more coding or scripts?

3. Once I finished DevOps course and certification, can I work and perform well?…

Cloud Security : One mistake that can close down your cloud operations in few minutes

Cloud Security : One mistake that can close down your cloud operations in few minutes

Few days back, I was in a discussion with a senior person. Our discussion was centred around cloud and security. We talked about lots of common and obvious processes and measures we can take for security of our applications on different platforms including but not limited to Amazon EC2, Azure and Google Cloud.

Cloud Computing Security

After discussion, I thought that I should write about most important thing in cloud security, which if not considered in your security plan, can be the reason of closure of your company in few minutes if not seconds.…

What is the best Linux software to monitor web traffic on router?

What is the best Linux software to monitor web traffic on router?

 am assuming that you want to log and monitor the traffic which is passing through a hardware router.

Your question seems incomplete to me because at router level, it is difficult to decide if data which is being transferred is for web or something else.

You can treat all TCP/IP data transfer as web data or to be more precise, you can treat data passing through port 80 as web data. ( As port 80 is default http protocol), but technically speaking http server can listen on any available port.…

How to handle checkout when we are selling unique products?

How to handle checkout when we are selling unique products?

Checkout process for unique product has to be handled in different way than products which are available in quantities. Products with one quantity are unique product. Paintings, concert tickets, hotel rooms, flight tickets ( when you choose a specific seat) are unique products. Old household items are also unique items.

We have two types of process for processing any purchase. In first type, we can do cart based checkout where a user usually add more than one product to their cart.…

In defense of QA team: Who is responsible for errors in any software or website?

In defense of QA team: Who is responsible for errors in any software or website?

Consider this hypothetical situation.

Something very precious was in a building. Building was being guarded by a guard who was responsible for the safety of precious item. A thief using his intelligence and luck stole that precious item from building. At a later stage, thief was caught but he claims that only security guard can be prosecuted for theft, in fact he demands that his act should be rewarded as a skill.

What is your first reaction? Impressed with thief’s arguments?…