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204 discussions - 1,090 posts

  • I'm planning on using Cassandra as a product's core data store, and it is imperative that it never goes down or loses data, even in the event of a data center failure. This uptime requirement ("five ...
    Les HazlewoodLes Hazlewood
    Jun 22, 2011 at 9:25 pm
    Jun 23, 2011 at 7:01 pm
  • This http://wiki.apache.org/cassandra/Operations#Token_selection says: "With NetworkTopologyStrategy, you should calculate the tokens the nodes in each DC independantly." and gives the example: DC1 ...
    Jun 14, 2011 at 10:47 pm
    Jun 17, 2011 at 7:56 pm
  • Hi, I'm running a test node with 0.8, and everytime I try to do a major compaction on one of the column families this message pops up. I have plenty of space on disk for it and the sum of all the ...
    Héctor Izquierdo SelivaHéctor Izquierdo Seliva
    Jun 10, 2011 at 11:17 am
    Jun 23, 2011 at 7:29 pm
  • Hi, what is the future API for Cassandra? Thrift, Avro, CQL? I just released an early version of my web client (http://www.codefreun.de/apollo) which is Thrift-based, and therefore I would like to ...
    Markus Wiesenbacher | Codefreun.deMarkus Wiesenbacher | Codefreun.de
    Jun 14, 2011 at 1:42 pm
    Jul 14, 2011 at 7:00 am
  • Hello, I was wondering if anyone had architecture thoughts of creating a simple bank account program that does not use transactions. I think creating an example project like this would be a good ...
    Trevor SmithTrevor Smith
    Jun 22, 2011 at 2:18 pm
    Jul 28, 2011 at 7:38 am
  • I am little confused of the reason why nodetool repair has to run within GCGraceSeconds. The documentation at: http://wiki.apache.org/cassandra/Operations#Frequency_of_nodetool_repair is not very ...
    A JA J
    Jun 30, 2011 at 8:25 pm
    Jul 12, 2011 at 3:02 pm
  • Hi, I have to store some files (Images, documents, etc.) for my users in a webapp. I use Cassandra for all of my data and I would like to know if this is a good idea to store these files into blob on ...
    Damien PicardDamien Picard
    Jun 22, 2011 at 7:08 am
    Jun 23, 2011 at 11:34 pm
  • I am very pleased to announce the official release of Cassandra 0.8.0. If you haven't been paying attention to this release, this is your last chance, because by this time tomorrow all your friends ...
    Eric EvansEric Evans
    Jun 2, 2011 at 11:37 pm
    Jun 8, 2011 at 11:34 pm
  • I have a couple of questions regarding the coordination of Cassandra nodetool snapshots with Amazon EBS snapshots as part of a Cassandra backup/restore strategy. Background: I have a cluster running ...
    Thoku HansenThoku Hansen
    Jun 22, 2011 at 10:49 pm
    Jun 23, 2011 at 4:35 pm
  • Good morning all. Hypothetical Setup: 1 data center RF = 3 Total nodes 3 Problem: Suppose I need maximum consistency for one critical operation; thus I specify CL = ALL for reads. However, this will ...
    Jun 16, 2011 at 3:19 pm
    Jun 17, 2011 at 5:02 am
  • for example, if I have an application that needs to read off a user browsing history, and I model the user ID as the key, and the history data within the row. with current approach, I could model ...
    Jun 28, 2011 at 4:20 pm
    Jul 1, 2011 at 8:49 am
  • Is C* suitable for storing customer account (financial) data, as well as billing, payroll, etc? This is a new company so migration is not an issue... starting from scratch. Thanks!
    Jun 21, 2011 at 5:30 pm
    Jun 22, 2011 at 2:29 pm
  • Good day everyone! I'm getting started with a new project and I'm thinking about using Cassandra because of its distributed quality and because of its performance. I'm using Java on the back-end ...
    Daniel ColcheteDaniel Colchete
    Jun 17, 2011 at 10:03 pm
    Jun 22, 2011 at 12:57 pm
  • Folks, Simple question ... Assuming my current use case is the ability to log lots of trivial and seemingly useless sports statistics ... I want a user to be able to query / compare .... For ...
    Sasha DolgySasha Dolgy
    Jun 21, 2011 at 4:13 pm
    Jun 22, 2011 at 10:48 am
  • Hi Everyone, Last week, upgraded all 4 nodes to apache-cassandra-0.8.0 .. no issues. Trolling the logs today, I find messages like this on all four nodes: INFO ...
    Sasha DolgySasha Dolgy
    Jun 12, 2011 at 6:20 pm
    Jun 14, 2011 at 9:12 am
  • Dear all, Is there any methods to list column names in a row? Thanks, Yonder
    Jun 2, 2011 at 9:40 am
    Jun 8, 2011 at 10:59 pm
  • I am trying to install Thrift with Solandra. Normally when I just want to install Thrift with Cassandra, I followed this tutorial:https://wiki.fourkitchens.com/display/PF/Using+Cassandra+with+PHP But ...
    Jean-Nicolas Boulay DesjardinsJean-Nicolas Boulay Desjardins
    Jun 7, 2011 at 3:04 am
    Jun 8, 2011 at 6:41 pm
  • Hi everyone, Is it possible to have direct control over where objects are stored in Cassandra? For example, I have a Cassandra cluster of 4 machines and 4 objects A, B, C, D; I want to store A at ...
    Khanh NguyenKhanh Nguyen
    Jun 5, 2011 at 1:41 am
    Jun 6, 2011 at 6:50 am
  • Hello, I am evaluating using cassandra and I'm running into some strange IO behavior that I can't explain, I'd like some help/ideas to troubleshoot it. I am running a 1 node cluster with a keyspace ...
    Jun 4, 2011 at 10:34 pm
    Jun 13, 2011 at 12:43 pm
  • Hello there! I have ran into a strange problem several times now and I wonder if someone here has an solution for me: For some of my data I want to keep track all the ID's I have used. To do that, I ...
    Mario MicklischMario Micklisch
    Jun 4, 2011 at 5:28 pm
    Jun 6, 2011 at 7:42 pm
  • Which one is preferred RAID0 or spreading data files accross various disks on the same node? I like RAID0 but what would be the most convincing argument to put additional RAID controller card in the ...
    Jun 27, 2011 at 11:46 pm
    Jun 29, 2011 at 7:14 pm
  • I woke up this morning to all 4 of 4 of my cassandra instances reporting they were down in my cluster. I quickly started them all, and everything seems fine. I'm doing a postmortem now, but it ...
    William ObermanWilliam Oberman
    Jun 22, 2011 at 12:35 pm
    Jun 22, 2011 at 10:44 pm
  • Hi. I had a brief look at CASSANDRA-2103 (expiring counter columns), and I was wondering if anyone can help me with my problem. I want to keep some page-view stats on a URL at different levels of ...
    Ian HolsmanIan Holsman
    Jun 9, 2011 at 7:41 pm
    Jun 16, 2011 at 6:29 pm
  • http://wiki.apache.org/cassandra/FAQ#range_ghosts "So to special case leaving out result entries for deletions, we would have to check the entire rest of the row to make sure there is no undeleted ...
    Jun 13, 2011 at 12:59 pm
    Jun 14, 2011 at 11:00 pm
  • how can get_range_slices() function returns sorting key ? BR
    Karim abbouhKarim abbouh
    Jun 23, 2011 at 9:59 am
    Jun 30, 2011 at 3:35 pm
  • Sorry, I know this is long-winded but I just want to make sure before I go through the trouble to implement this since it's not something that can be reliably tested and requires in-depth knowledge ...
    Jun 24, 2011 at 6:33 pm
    Jun 25, 2011 at 8:16 pm
  • The way compaction works, "x" same-sized files are merged into a new SSTable. This repeats itself and the SSTable get bigger and bigger. So what is the upper limit?? If you are not deleting stuff ...
    Jonathan ColbyJonathan Colby
    Jun 22, 2011 at 4:36 pm
    Jun 22, 2011 at 6:10 pm
  • as https://issues.apache.org/jira/browse/CASSANDRA-2101 indicates, the problem with counter delete is in scenarios like the following: add 1, clock 100 delete , clock 200 add 2 , clock 300 if the 1st ...
    Jun 13, 2011 at 3:54 pm
    Jun 15, 2011 at 6:33 am
  • Hi, I am working on a backup strategy and am trying to understand what is going on in the data directory. I notice that after a write to a CF and then flush, a new set of data files are created with ...
    Jun 7, 2011 at 5:04 am
    Jun 7, 2011 at 8:47 pm
  • Hi all, I have upgraded all my cluster to 0.8.1. Today one of the disks in one of the nodes died. After replacing the disk I tried running repair, but this message appears: INFO ...
    Héctor Izquierdo SelivaHéctor Izquierdo Seliva
    Jun 30, 2011 at 9:12 pm
    Jul 5, 2011 at 9:36 pm
  • Can any Cassandra contributors/guru's confirm my understanding of Cassandra's degree of support for the ACID properties? I provide official references when known. Please let me know if I missed some ...
    Jun 24, 2011 at 6:57 am
    Jul 1, 2011 at 6:27 pm
  • Since upgrading to 0.7.6-2 I'm seeing the following exception in our server logs: ERROR [MutationStage:1184874] 2011-06-22 23:59:43,867 AbstractCassandraDaemon.java (line 114) Fatal exception in ...
    Jim AnconaJim Ancona
    Jun 23, 2011 at 5:47 pm
    Jun 24, 2011 at 1:31 pm
  • Been trying for the past little bit to try and get the PIG integration working with Cassandra 0.8.0 1. Downloaded the src for 0.8.0 and ran ant build 2. went into contrib/pig and ran ant ... gives ...
    Sasha DolgySasha Dolgy
    Jun 20, 2011 at 6:10 pm
    Jun 21, 2011 at 3:46 pm
  • I would like to store some timestamped user info in a Column Family with the usernames as the row key and different timestamps as column names. Each user might have a thousand timestamped data. I ...
    Sameer FarooquiSameer Farooqui
    Jun 15, 2011 at 12:16 am
    Jun 16, 2011 at 7:49 am
  • I did a insertion test with and without secondary indexes, and found that: Without secondary index: ~10864 rows inserted per second With secondary index on one column(BytesType): ~1515 rows inserted ...
    Donal ZangDonal Zang
    Jun 5, 2011 at 10:44 pm
    Jun 6, 2011 at 12:48 pm
  • We embed cassandra in our app. When we first load a cluster, we specify one node in the cluster as the seed node. This node installs the schema using StorageService.instance.loadKeyspacesFromYAML() ...
    Paul LoyPaul Loy
    Jun 3, 2011 at 4:15 pm
    Jun 4, 2011 at 2:20 am
  • Hi Everyone, I'm seeing Cassandra GC a lot and I would like to tune the Young space and the Tenured space. Anyone would have recommendations on the NewRatio or NewSize/MaxNewSize to use for an ...
    Sebastien CoutuSebastien Coutu
    Jun 16, 2011 at 2:47 pm
    Jun 20, 2011 at 2:28 pm
  • Hi, I have an index I use to translate ids. I usually only read a column at a time, and it's becoming a bottleneck. I could rewrite the application to read a bunch at a time but it would make the ...
    Héctor Izquierdo SelivaHéctor Izquierdo Seliva
    Jun 8, 2011 at 3:13 pm
    Jun 10, 2011 at 10:27 am
  • I want to make sure I'm not seeing things from a weird perspective. I have two Cassandra instances where one is set to be the seed, with autobootstap disabled and its seed being The second ...
    David McNelisDavid McNelis
    Jun 3, 2011 at 4:21 pm
    Jun 6, 2011 at 12:08 pm
  • Hi, I am planning to use Cassandra to store my users passwords and at the same time data for my website that need to be accessible via search. My Question is should I use two DB: Cassandra (for users ...
    Jean-Nicolas Boulay DesjardinsJean-Nicolas Boulay Desjardins
    Jun 4, 2011 at 4:52 pm
    Jun 5, 2011 at 1:45 pm
  • Hi, First of all, thank you for releasing v8.0.1 and congrats! the list of fixes and improvements is impressive. Is there any ETA for Debian package? Is there a (standard) way to build it from ...
    Oleg TsvinevOleg Tsvinev
    Jun 29, 2011 at 12:25 am
    Jun 29, 2011 at 3:36 am
  • During writes, the timestamp field in the column is the system-time of that node (correct me if that is not the case and the system-time of the co-ordinator is what gets applied to all the ...
    A JA J
    Jun 27, 2011 at 10:04 pm
    Jun 28, 2011 at 8:59 pm
  • I'd like to verify the behavior of Cassandra under some edge case message loss scenarios. it's rather difficult to reproduce such things, cuz you have to setup multiple servers, and on each box ...
    Jun 25, 2011 at 2:58 am
    Jun 25, 2011 at 7:38 pm
  • I have a query: I have my Cassandra server running on my local machine and it has loaded Cassandra specific settings from apache-cassandra-0.8.0-src/apache-cassandra-0.8.0-src/conf/cassandra.yaml Now ...
    Vivek MishraVivek Mishra
    Jun 17, 2011 at 7:56 am
    Jun 21, 2011 at 11:48 am
  • Hi all, Anyone experiencing this..? I noticed one of my 7.6-2 nodes had inexplicable and consistently high cpu usage. Checking the log I found that there was a some kind of SSTable corruption that ...
    Dominic WilliamsDominic Williams
    Jun 17, 2011 at 9:31 am
    Jun 17, 2011 at 6:20 pm
  • Ver 0.8.0. Please help. I don't know what I'm doing wrong. One simple keyspace with one simple CF with one simple column. I've tried two simple tutorials. Is there a common newbie mistake I could be ...
    Jun 7, 2011 at 6:22 pm
    Jun 9, 2011 at 4:06 am
  • Hi, In Cassandra 0.8, CQL become the primary client interface, but I don't know how to use it in a non-command line env. I could not find out any how-to do docs in Wiki or DataStax's website. Thanks
    Jun 4, 2011 at 4:17 pm
    Jun 6, 2011 at 11:23 pm
  • https://github.com/riptano/hector-jpa Is this solution usable? I had problems building it, now tests won't pass.
    Patrick JulienPatrick Julien
    Jun 6, 2011 at 9:55 pm
    Jun 6, 2011 at 11:10 pm
  • Hello, I am trying to understand the way cassandra reads data. I've been reading a lot and here is what I understand. Can I get some feedback on the following claims ? Which are right and which are ...
    Jun 24, 2011 at 8:59 pm
    Jul 12, 2011 at 11:23 pm
  • Someone asked a while ago whether Cassandra was vulnerable to injection attacks: http://stackoverflow.com/questions/5998838/nosql-injection-php-phpcassa-cassandra With Thrift, the answer was 'no' ...
    Jun 29, 2011 at 7:13 pm
    Jul 3, 2011 at 8:23 pm
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164 users for June 2011

Aaron morton: 94 posts AJ: 81 posts Jonathan Ellis: 77 posts Sasha Dolgy: 59 posts Yang: 30 posts Edward Capriolo: 23 posts Ryan King: 23 posts Terje Marthinussen: 22 posts Sylvain Lebresne: 21 posts Les Hazlewood: 19 posts Will Oberman: 19 posts Jeremy Hanna: 18 posts Héctor Izquierdo Seliva: 17 posts Peter Schuller: 17 posts Jonathan Colby: 16 posts Jean-Nicolas Boulay Desjardins: 15 posts Jake Luciani: 13 posts Jeremiah Jordan: 13 posts Mcasandra: 13 posts Vivek Mishra: 13 posts
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