Node JS for backend programmers
I started working in a new and exciting start up, and the thought of using Java for development crushed my soul, so I began shopping around for a fast-develo...
I started working in a new and exciting start up, and the thought of using Java for development crushed my soul, so I began shopping around for a fast-develo...
I have a project that mixes Java and Groovy, and the main problem I ran into was that the jar was nicely built, but it only contained the Java classes, and n...
XML is not native to Java. Many will disagree, but this is just the simple truth. It’s tedious, messy and generally ugly - specially compares to Groovy or Sc...
I opened up a new blog about investments , and I wanted it to be in Hebrew. Problem is , WordPress is basically for ltr languages - and if you install the rt...
I wanted to create an executable jar in maven , s.t whenever I run”mvn install” , it will generate both the regular one and the executable one.
I came to Log4Net because I really loved Log4j , but I must say the documentation on this project is simply crappy, and half of the links in the project page...
Unfortunately , we reached the conclusion that HBase is still not stable enough for us to use in production environment. I think it’s a great project , and I...
After a lengthy discussion with St.Ack (on the hbase channel in the mirc) and Jean Daniel about this bug , we currently believe that what we’re seeing is “ …...
We assumed that the bug was caused mainly because of the high load rate , and that once the bulk of the data will be in HBase and the load will drop consider...
As you remember , HBase tends to collapse (Return”NotServingRegionException”) after a few millions of files (Latest crash: 6 million). Since we (want to) bel...
We’ve been working on the previous bug (last post) for a few days now , but unfortunately nothing is working. We’ve suspected the error might be caused by wr...
We’ve tried loading the system with 10,000 , 100,000 and 200,000 files - everything worked perfectly.
Today we started the production-mode experiemnts.
We are planning to move on to production soon , and we intend to build a test environment that will resemble the production environment as close as possible.
As you can see in the previous blog , Hadoop successfully failover , but it fails to failback. Our solution to this problem is this:
I’ve been trying to cause the NN to recognize that it is inconsistent and turn to the SNN for data.
We’ve decided to test using linux HeartBeat together with hadoop , to enavle failover (and failback) capacbilities.
Hbase configuration and running is very similar to hadoops. Not surprisingly , they also have a nice Getting Started page. The tricky part , though , is to u...
First thing : It works. If you’re getting a lot error messages and you start thinking “well , maybe it’s crap. still 0.18 can’t be that good a version” Stop...
We have a very large amount of relatively small files (~5k avg , 41k max , 0k min) , that we access a lot (20M times a day) for various computations. Current...
I started working in a new and exciting start up, and the thought of using Java for development crushed my soul, so I began shopping around for a fast-develo...
XML is not native to Java. Many will disagree, but this is just the simple truth. It’s tedious, messy and generally ugly - specially compares to Groovy or Sc...
java.lang.IllegalArgumentException: Comparison method violates its general contract!
I have a brand new Lenovo T510 , i7, 4G ,64bit , Windows 7 with an Nvidia GPU - and it sucks. In this price , with these specifications , it really shouldn’t...
This is a part of my Scala tutorial . Read the first part & second part for a more general Scala intro. You can read here for an overview of how to write...
Another syntax sugar provided in Scala are the default values for parameters , and the named parameters. Its fairly stright forwards , so We’ll just start wi...
This is a part of my Scala tutorial . Read the first part & second part for a more general Scala intro. You can read here for an overview of how to write...
This is part 3 of my Scala tutorial – read the first part and the second part for a more general Scala intro. All the examples you see here were ran via the ...
Today I’ve started a 3 days course (sponsored by my work place ) in Scala. The prerequisites are just”Experienced in Java” .
http://cdevroe.com/notes/code-maintenance-dont-ask/
I’m writing a program that is a little data intensive. At first , when the user clicked the X and choose”yes” at the”are you sure” box , I would do the clean...
I wanted to create an executable jar in maven , s.t whenever I run”mvn install” , it will generate both the regular one and the executable one.
This thing drives me insane every time . It almost always happens in the middle of a mega-update, and usually the only solution is to delete everything and r...
“Programming managers have long recognized wide productivity variations between good programmers and poor ones”
I came to Log4Net because I really loved Log4j , but I must say the documentation on this project is simply crappy, and half of the links in the project page...
Problem:
Problem:
We have a very large amount of relatively small files (~5k avg , 41k max , 0k min) , that we access a lot (20M times a day) for various computations. Current...
I’m mainly a back-end engineer - through my not-so-long career, I’ve dealt with sql, no-sql, offline processes, etl mechanisms, billing services, web-crawler...
Some of you may have noticed that the Windows Task Manager doesn’t show you the real memory consumption of the applications you’re running. It’s quite obviou...
I’ve been getting a lot of emails lately from a website called”Zorpia” claiming I have a message from someone named Katja. I’ve never signed into this websit...
I’ve recently encountered few people who were naive about the representations of real (i.e not integers) numbers in computer languages , like double and floa...
This is a part of my Scala tutorial . Read the first part & second part for a more general Scala intro. You can read here for an overview of how to write...
I’ve started using SOAP in Groovy. As I’m new both to SOAP and to Groovy , this is a little basic.
I must admit that I find the windows PowerShell a really-way-too-late pale substitution for the full capacity of the unix shell , but since I sometimes need ...
This is a part of my Scala tutorial . Read the first part & second part for a more general Scala intro. You can read here for an overview of how to write...
Another syntax sugar provided in Scala are the default values for parameters , and the named parameters. Its fairly stright forwards , so We’ll just start wi...
This is a part of my Scala tutorial . Read the first part & second part for a more general Scala intro. You can read here for an overview of how to write...
This is part 3 of my Scala tutorial – read the first part and the second part for a more general Scala intro. All the examples you see here were ran via the ...
Today I’ve started a 3 days course (sponsored by my work place ) in Scala. The prerequisites are just”Experienced in Java” .
I have a brand new Lenovo T510 , i7, 4G ,64bit , Windows 7 with an Nvidia GPU - and it sucks. In this price , with these specifications , it really shouldn’t...
Cool story about how sun almost ditched Java , and only by chance it became what it is today
(Off topic)
I have a brand new Lenovo T510 , i7, 4G ,64bit , Windows 7 with an Nvidia GPU - and it sucks. In this price , with these specifications , it really shouldn’t...
Cool story about how sun almost ditched Java , and only by chance it became what it is today
This thing drives me insane every time . It almost always happens in the middle of a mega-update, and usually the only solution is to delete everything and r...
I have a project that mixes Java and Groovy, and the main problem I ran into was that the jar was nicely built, but it only contained the Java classes, and n...
XML is not native to Java. Many will disagree, but this is just the simple truth. It’s tedious, messy and generally ugly - specially compares to Groovy or Sc...
java.lang.IllegalArgumentException: Comparison method violates its general contract!
I came to Log4Net because I really loved Log4j , but I must say the documentation on this project is simply crappy, and half of the links in the project page...
I’m a Java programmer , and I’m starting to work on a production project written in C# , so this is a great time to start learning this language . I’ve neve...
“Programming managers have long recognized wide productivity variations between good programmers and poor ones”
I’m writing a program that is a little data intensive. At first , when the user clicked the X and choose”yes” at the”are you sure” box , I would do the clean...