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Never use run_erl 16 May 2012 | 05:33 am
In one of my projects I used run_erl to launch Erlang VM in daemon mode, rotate logs, etc. If seemed fine to use standard Erlang tool. run_erl is a part of Erlang distribution. I discovered unexpecte...
gen_server antipattern 30 Dec 2011 | 11:44 am
Two gen_server-s should never gen_server:call each other: gen_server A calls gen_server B: it sends request message and blocks on receive. gen_server B calls gen_server A: it sends request message a...
Cassandra migration from 0.6 to 0.7 22 Sep 2011 | 12:49 am
Cassandra is not mature. I discovered data corruption errors in 0.6. I found nothing that could help me to fix this and I decided to migrate to 0.7 hoping the errors are fixed there. All you have to ...
ThinkPad X220 22 May 2011 | 11:08 pm
Finally got my X220. First, replaced HDD with Intel SSD 160GB G2. It required small hardware tweak: X220 has 7mm HDD and SSD was about 12mm height. I had to remove plastic frame from SSD. DisplayPort...
When to touch swappiness 17 Nov 2010 | 04:51 am
There are lots of discussion on the lists on whether to touch or not to touch /proc/sys/vm/swappiness parameter and there is not definitive answers on that. I figured out a situation when tuning the p...
Apache Cassandra experience 14 Nov 2010 | 05:31 am
At one of my projects I switched from Postgresql to Cassandra. There were reasons for the switch. First. For each user I had to keep an inbox for storing incoming messages and events. What is inbox? ...
Google AppEngine Experience 10 Nov 2010 | 09:07 am
At first glance, AppEngine is really nice with all that cloud-computing. Pay only for what you use. Scale indefinitely. Of course, you have some limitations, like custom (Python or Java) environment w...
Relay auth to an XMPP component 29 Sep 2010 | 01:00 am
Standard ejabberd auth modules include odbc, ldap, external (with script). Also there is original module "internal" which hosts users data in Mnesia. But sometimes these modules are not enough. Writi...
Thinkpad T61 warranty repair 11 Sep 2010 | 07:28 am
I've been using T61 for about two years and a half. Recently the screen flashed and turned off while I was working. It didnt turn on any more. I had checked my serial number at Lenovo site and happil...
Why my Android sucks 26 Jul 2010 | 07:36 pm
I've been using HTC Legend with Android 2.1 for about two months. There are few major things that make the experience much worser than it could be: The device is unable to play popular video formats ...
