Tamás Tarjányi's Blog

I do not like negative campaigning but when I read the story about Microsoft`s anti-Google mugs and the answer from Google  I felt the need to quickly made my versions.

Ezt az összefoglalót először facebookon  tettem közzé , majd később az androbiten is megjelent  egy kedves kollégámnak köszönhetően.  De gondoltam itt is megjelentetem utólagosan.      The world is a dangerous place to live     not because of the people who are evil,     but because of the people who don't do anything about it.                                                Albert Einstein 2013.06.06.           Hír:    Kiderült, hogy az USA kormánya több millió Verizon ügyfél hívásának adatait gyűjtheti össze egy titkos engedély alapján .    A magyarázat szerint, mivel csak a hívások metaadatait tárolták - ki kit hívott, mikor és mennyi ideig tartott a hívás - de magukat a hívásokat nem, és a metaadat nem minősül kommunikációnak, ezért nem volt szükség kü...

In the last days I was testing Hortonworks Data Platform 2.0 (Alpha) . Previously I mainly used Cloudera distributions but because of this bug  in CDH 4.1.3 I wanted to test alternatives. And I choose HDP. Note: This bug practically means that using RCFILE is useless with hive-0.9.0. The column pruning is not used by hive at all. Now it seems that the problem is in HIVE-0.9.0. Unfortunately there is a bug also in HDP 2.0. This is not so serious however. When Ambari is  used for automated installation it can fail with  "Oozie test Fails" or if Oozie is not selected than with "Hive/HCatalog test Fails" message and the deployment log will show the following error message:  "\"Sun Mar 03 21:38:03 +0100 2013 /Stage[2]/Hdp2-hive::Hive::Service_check/Exec[/tmp/hiveSmoke.sh]/returns (notice): FAILED: Hive Internal Error: org.apache.hadoop.hive.ql.metadata.HiveException(MetaException(message:Could not connect to meta store using any of the URIs provide...

Over the weekend I have had 2 technical problems. And a third one which was the emotional consequence of the 2 technical ones. So the first problem was a result of iOS5 update. My iTouch 4th gen became unstable. I liked my iTouch, iPad and iXXXXX because they were always responsive and reliable. No lags no glitches no errors. But after I have installed iOS5 on my iTouch. My oh my!!! Lags are there and makes me feel like on Windows. The other issue seems to be a bug. You can test it by yourself. Start "App Store" - Select "Updates" - Select "Purchased" - Select "Not on this iPod" - Swipe right to left on any item and then select the "Hide" button. In my case "App Store" always does exit. Steve Jobs have died just one week before the release of iOS5 and here we are. Everything I really like for iOS devices have gone. Think about it. The other problem is more serious. And to be honest more depressing to me. I have upgrad...

Me and my colleagues had been fighting an issue for some days. Since it made me really-really f**** upset I decided to investigate it now. The issue: is that if you are behind a proxy (not necessarily) - http or socks does not matter much - you might have problem with ec2-ami-tools . When you start ec2-upload-bundle it does nothing just looks like hanging. We had been waiting for some minutes but nothing happened. Actually it is trying to do something but can not start upload. In contrast on my home network ec2-upload-bundle almost immediately starts uploading and showing a message to indicate it. So what is wrong? Why this is happening from behind a proxy? Is it proxy related? We have tested many possible workarounds without any luck. First we have specified http_proxy and https_proxy of course but it did not work. Then we also tried to socksify the process. Without any luck. At that point we decided to eliminate the proxies. We got an access to a machine in DMZ and we m...

Note: Cloud computing is currently a very dynamic segment of IT and relevant changes - regarding technologies, available features and licensing - might happen anytime. First of all you may ask why to build your own AMI when you can find many existing  - CentOS and other free - Amazon EC2 images. The following sentences are taken from an official amazon document . "You launch AMIs at your own risk. Amazon cannot vouch for the integrity or security of AMIs shared by other EC2 users. Therefore, you should treat shared AMIs as you would any foreign code that you might consider deploying in your own data center and perform the appropriate due diligence. Ideally, you should get the AMI ID from a trusted source (a web site, another EC2 user, etc). If you do not know the source of an AMI, we recommend that you search the forums for comments on the AMI before launching it. Conversely, if you have questions or observations about a shared AMI, feel free t...

Ubuntu 10.04 (Lucid) is out for a while and I wanted to try to install a private UEC on a previously installed Ubuntu 10.04 system only for testing something. I did not want to use the CDInstall method since I like to do the magic not just watching that. So I have decided to install from packages . (Ok you are right I should have tried to do it from Eucalyptus source but I did not have enough time.) Unfortunately it was not straightforward. During installation of eucalyptus-cloud package I got an error. ... Setting up eucalyptus-cloud (1.6.2-0ubuntu30.2) ... restart: Unknown instance: (Than waiting long....~60 sec) eucalyptus-cloud stop/post-start, (post-start) process 26868 eucalyptus-cloud-publication start/running, process 27475 ... Hmmm. I have checked whether it is an install issue only or also a runtime problem. Checked the configuration files but they were fine. Eucalyptus start is slow and finally failed without visible error message. The cluster contro...