Re: Running Cassandra as a Windows Service
Hello Why not using Java Wrapper Service? http://wrapper.tanukisoftware.org/doc/english/download.jsp You can configure any java process as real windows services instead of batch files Richard On Thu, Jun 10, 2010 at 8:34 PM, Kochheiser,Todd W - TO-DITT1 twkochhei...@bpa.gov wrote: For various reasons I am required to deploy systems on Windows. As such, I went looking for information on running Cassandra as a Windows service. I’ve read some of the user threads regarding running Cassandra as a Windows service, such as this one: * http://www.mail-archive.com/user@cassandra.apache.org/msg01656.html*http://www.mail-archive.com/user@cassandra.apache.org/msg01656.html I also found the following JIRA issue: *https://issues.apache.org/jira/browse/CASSANDRA-292*https://issues.apache.org/jira/browse/CASSANDRA-292 As it didn’t look like anyone has contributed a formal solution and having some experience using Apache’s Procrun (* http://commons.apache.org/daemon/procrun.html*http://commons.apache.org/daemon/procrun.html), I decided to go ahead and write a batch script and a simple “WindowsService” class to accomplish the task. The WindowsService class only makes calls to public methods in CassandraDeamon and is fairly simple. In combination with the batch script, it is very easy to install and remove the service. At this point, I’ve installed Cassandra as a Windows service on XP (32 bit), Windows 7 (64 bit) and Windows Server 2008 R1/R2 (64 bit). It should work fine on other version of Windows (2K, 2K3). Questions: 1. Has anyone else already done this work? 2. If not, I wouldn’t mind sharing the code/script or contributing it back to the project. Is there any interest in this from the Cassandra dev team or the user community? Ideally the WindowsService could be included in the distributed source/binary distributions (perhaps in a contrib area) as well as the batch script and associated procrun executables. Or, perhaps it could be posted to a Cassandra community site (is there one?). Todd
Model to store biggest score
Hi, I trying to find a model where I can keep the list of biggest score for users. it's seems simple but I'm stuck here . For example user1 score = 10 user2 score = 20 user3 score = 30 Query: Top score (2) = user3, user2 If someone have made something similar thanks for sharing Richard
Re: Model to store biggest score
But in the case of simple column family I've the same problem when I update the score of 1 user then I need to remove his old score too. For example here the user uid5 was at 130 now he is at 140 because I add the random number cassandra will keep all the score evolution. get Keyspace2.topScoreUser['top'] = (column=140-1, value=uid5, timestamp=1268841641979) = (column=130-2, value=uid5, timestamp=1268841614066) = (column=130-1, value=uid4, timestamp=1268841594786) = (column=130, value=uid4, timestamp=1268841517352) = (column=120, value=uid3, timestamp=1268841509536) = (column=110, value=uid2, timestamp=1268841501720) = (column=100, value=uid1, timestamp=1268841496069) Is it wrong ? On Wed, Mar 17, 2010 at 6:20 PM, Brandon Williams dri...@gmail.com wrote: On Wed, Mar 17, 2010 at 11:13 AM, Toby DiPasquale t...@cbcg.net wrote: Couldn't you just use a supercolumn whose keys were the score and the subcolumns were username:true? Basically using the subcolumns as a list? Sure, but that complicates getting the top N scores. You'd have to use the OrderedPartioner, so it's a bit less flexible. Also, any time a score changed you'd have to find the old one and remove them. -Brandon
