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116 discussions - 621 posts

  • Hi there, I'm currently running a 2-node cluster for some small projects that might need to scale-up in the future: that's why we chose Cassandra. The actual problem is that one of the node's ...
    R. VerlangenR. Verlangen
    Jan 25, 2012 at 3:09 pm
    Feb 5, 2012 at 8:24 pm
  • Hi Everyone, What's the best way to reliably have unique constraints like functionality with Cassandra? I have the following (which I think should be very common) use case. User CF Row Key: user ...
    Drew KutcharianDrew Kutcharian
    Jan 6, 2012 at 6:04 pm
    Jan 7, 2012 at 7:16 am
  • Hi, I can't start a node of my cluster. Could someone help me to catch the problem? Using: debian with cassandra 1.0.6. root@carlo-laptop:/etc/cassandra# cat /var/log/cassandra/output.log INFO ...
    Carlo PiresCarlo Pires
    Jan 4, 2012 at 4:10 pm
    Mar 27, 2012 at 2:01 pm
  • How stable is 1.0 these days? We're on 0.8.6, and the early 1.0.x versions made me nervous - too many changes that were fixing regressions in previous 1.0.x versions. But the pace of 1.0.x releases ...
    David CarltonDavid Carlton
    Jan 26, 2012 at 1:32 am
    Mar 5, 2012 at 4:14 pm
  • Hi All Time to time I am seen this below warning in Cassandra logs. WARN [Memtable] setting live ratio to minimum of 1.0 instead of 0.21084217381985554 Not sure what the exact cause for this and the ...
    Jan 31, 2012 at 12:55 am
    Feb 8, 2012 at 3:12 am
  • Hi, we're using RP and have each node assigned the same amount of the token space. The cluster looks like that: Address Status State Load Owns Token 205648943402372032879374446248852460236 1 Up ...
    Marcel SteinbachMarcel Steinbach
    Jan 17, 2012 at 3:35 pm
    Jan 23, 2012 at 8:47 am
  • Hi, I have a 4 nodes cluster 1.0.3 version This is what I get when I run nodetool ring Address DC Rack Status State Load Owns Token 127605887595351923798765477786913079296 datacenter1 ...
    Michael VaknineMichael Vaknine
    Jan 16, 2012 at 10:05 am
    Jan 19, 2012 at 2:19 pm
  • I can't remember if I asked this question before, but.... We're using Cassandra as our transactional system, and building up quite a library of map/reduce jobs that perform data quality analysis, ...
    Brian O'NeillBrian O'Neill
    Jan 20, 2012 at 5:28 pm
    Jan 22, 2012 at 3:41 pm
  • Hi there, I'm running a cassandra 0.8.6 cluster with 2 nodes (in 2 DC's), RF = 2. Actual data on the nodes is only 1GB. Disk latency < 1ms. Disk throughput ~ 0.4MB/s. OS load always below 1 (on a 8 ...
    R. VerlangenR. Verlangen
    Jan 5, 2012 at 10:58 am
    Jan 5, 2012 at 7:53 pm
  • Hello Is it possible set TCP_NODELAY on thrift socket in cassandra?
    Ruslan usifovRuslan usifov
    Jan 26, 2012 at 1:17 pm
    Jan 27, 2012 at 7:48 am
  • Hello I try to log thrift log message (this need to us for solve communicate problem between Cassandra daemon and php client ), so in log4j-server.properties i write follow lines ...
    Ruslan usifovRuslan usifov
    Jan 24, 2012 at 9:51 pm
    Jan 25, 2012 at 10:04 pm
  • Hello, I have a doubt about how initial token is determined. In Cassandra's documentation it is said that it is better to manually configure the initial token to each node in the system but also is ...
    Carlos Pérez MiguelCarlos Pérez Miguel
    Jan 13, 2012 at 5:41 pm
    Jan 16, 2012 at 9:52 am
  • Tamar FraenkelTamar Fraenkel
    Jan 20, 2012 at 9:13 am
    Jan 23, 2012 at 9:22 am
  • Hi There, I am a beginner user in Cassandra. I hear from many people said Cassandra is a powerful database software which is used by Facebook, Twitter, Digg, etc. So I feel interesting to study more ...
    Bobby saputraBobby saputra
    Jan 5, 2012 at 5:05 pm
    Jan 10, 2012 at 4:30 am
  • [moving to user list] There are no plans to remove the Thrift API. -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of DataStax, the source for professional Cassandra support ...
    Jonathan EllisJonathan Ellis
    Jan 27, 2012 at 2:34 pm
    Jan 29, 2012 at 10:36 am
  • Do you think that for a standard project with 50.000.000 of rows on 2-3 machines cassandra is appropriate or i should use a normal dbms? -- francesco.tangari.inf@gmail.com Inviato con Sparrow ...
    Francesco Tangari InfFrancesco Tangari Inf
    Jan 25, 2012 at 2:38 am
    Jan 26, 2012 at 10:25 pm
  • Hello, I've set up a testing evironment for Cassandra and MySQL, to compare both, regarding *performance only*. And I must admit that I was expecting Cassandra to beat MySQL. But I've not seen this ...
    Gustavo GustavoGustavo Gustavo
    Jan 22, 2012 at 1:11 pm
    Jan 25, 2012 at 3:42 am
  • Hi! We're evaluating Cassandra for our storage needs. One of the key benefits we see is the online replication of the data, that is an easy way to share data across nodes. But we have the need to ...
    Andreas RudolphAndreas Rudolph
    Jan 10, 2012 at 8:53 am
    Jan 12, 2012 at 7:49 am
  • Hello Community, Am troubleshooting an issue with sudden and sustained high CPU on nodes in a 3 node cluster. This takes place when there is minimal load on the servers, and continues indefinitely ...
    Matthew TrinneerMatthew Trinneer
    Jan 25, 2012 at 2:26 pm
    Feb 6, 2012 at 1:58 pm
  • I'm storing very large versioned lists of names, and I'd like to query a range of names within a given range of versions, which is a two dimensional slice, in a single query. This is easy to do using ...
    Bryce AllenBryce Allen
    Jan 20, 2012 at 5:21 pm
    Jan 30, 2012 at 7:49 pm
  • We're embarking on a project where we estimate we will need on the order of 100 cassandra nodes. The data set is perfectly partitionable, meaning we have no queries that need to have access to all ...
    Thorsten von EickenThorsten von Eicken
    Jan 20, 2012 at 5:17 am
    Jan 23, 2012 at 8:56 am
  • Hi, I am configured to do incremental backups on all my node on the cluster but it is not working. In cassandra.yaml : incremental_backups: true When I check data folder there are some keyspaces that ...
    Michael VaknineMichael Vaknine
    Jan 18, 2012 at 8:12 am
    Jan 19, 2012 at 6:41 pm
  • I have seen supercolumns usage been discouraged most of the times. However sometimes the supercolumns seem to fit the scenario most appropriately not only in terms of how the data is stored but also ...
    Jan 5, 2012 at 5:38 am
    Jan 8, 2012 at 7:10 am
  • Hi everyone and Happy New Year! I need advice for organizing data flow outside of my 3 node Cassandra 0.8.6 cluster. I am configuring my keyspace to use the NetworkTopologyStrategy. I have 2 data ...
    Alexandru SicoeAlexandru Sicoe
    Jan 2, 2012 at 10:00 pm
    Jan 5, 2012 at 7:13 pm
  • I have a super columns family which I always use to retrieve a list of supercolumns(with all subcolumns) by name. I am looking forward to replace all SuperColumns in my schema with the composite ...
    Asil KlinAsil Klin
    Jan 3, 2012 at 7:58 pm
    Jan 4, 2012 at 8:14 pm
  • I have tried Sebastien's phpmyAdmin For Cassandra<https://github.com/sebgiroux/Cassandra-Cluster-Admin to see the data stored in Cassandra in the same manner as phpMyAdmin allows. But since it makes ...
    Ertio LewErtio Lew
    Jan 29, 2012 at 9:26 pm
    Feb 1, 2012 at 9:42 am
  • Hi We have deployed two node Cassandra 1.0.6 cluster to production and it create SSTables on daily with different sizes. As I know, Cassandra will compact 4 (as default compaction threshold) same ...
    Jan 23, 2012 at 11:46 pm
    Feb 1, 2012 at 12:15 am
  • What is the fastest way to copy a column family? We were headed down the map/reduce path, but that seems silly. Any file level mechanisms for this? -brian -- Brian ONeill Lead Architect, Health ...
    Brian O'NeillBrian O'Neill
    Jan 9, 2012 at 3:15 pm
    Jan 24, 2012 at 6:47 pm
  • I'm wondering how to modelize my CFs to store the number of unique visitors in a time period in order to be able to request it fast. I thought of sharding them by day (row = 20120118, column = ...
    Jan 18, 2012 at 5:24 pm
    Jan 19, 2012 at 9:22 pm
  • I'm using Cassandra 1.0.3 on a 2 nodes cluster. My schema (with replication_factor=2) contains both compressed (with sstable_compression=DeflateCompressor) and uncompressed column families. When ...
    Alexis LauthierAlexis Lauthier
    Jan 13, 2012 at 3:21 pm
    Jan 17, 2012 at 11:38 pm
  • Is anyone familiar with any tools that are already available to allow for configurable synchronization of different clusters? Specifically for purposes of development, i.e. Dev, staging, test, and ...
    David McNelisDavid McNelis
    Jan 10, 2012 at 9:01 pm
    Jan 16, 2012 at 12:01 am
  • hi all, having read: http://wiki.apache.org/cassandra/FAQ#batch_mutate_atomic i would like some clarification: is a write to a single row key in a single column family atomic in the sense that i can ...
    Guy IncognitoGuy Incognito
    Jan 23, 2012 at 8:21 pm
    Jan 25, 2012 at 12:05 am
  • Tamar FraenkelTamar Fraenkel
    Jan 22, 2012 at 1:38 pm
    Jan 24, 2012 at 1:07 am
  • Hi, I am experiencing a delay in delete operations in cassandra. Its as follows. I am running a thread which contains following three steps. Step 01: Read data from column family "foo" [1] Step 02 ...
    Shammi JayasingheShammi Jayasinghe
    Jan 20, 2012 at 11:43 am
    Jan 23, 2012 at 9:35 am
  • I'm running a single node cassandra 1.0.6 server which hit a wall yesterday: ERROR [CompactionExecutor:2918] 2012-01-12 20:37:06,327 AbstractCassandraDaemon.java (line 133) Fatal exception in thread ...
    Thorsten von EickenThorsten von Eicken
    Jan 13, 2012 at 7:01 pm
    Jan 20, 2012 at 3:46 am
  • Hi, I've been doing some tests using wide rows recently, and I've seen some odd performance problems that I'd like to understand. In particular, I've seen that the time it takes for Cassandra to ...
    Josep BlanquerJosep Blanquer
    Jan 18, 2012 at 1:45 am
    Jan 19, 2012 at 9:38 am
  • Hi All, We have 5 nodes cluster(on 0.8.6), but two machines are slower and have less memory, so the performance was not good on those two machines for large volume traffic.I want to move some data ...
    Daning WangDaning Wang
    Jan 11, 2012 at 7:32 pm
    Jan 15, 2012 at 5:53 pm
  • Hello. We are using cassandra for some time in our project. Currently we are on 1.1 trunk (it was accidental migration, but since it's hard to migrate back and it's performing nice enough we are ...
    Віталій ТимчишинВіталій Тимчишин
    Jan 3, 2012 at 10:19 am
    Jan 13, 2012 at 12:39 pm
  • in a traditional database it's not a good a idea to have hundreds of tables but is it also bad to have hundreds of column families in cassandra? thank you.
    Michael CetruloMichael Cetrulo
    Jan 4, 2012 at 10:51 pm
    Jan 6, 2012 at 3:10 pm
  • Hi, We use Cassandra in a way we always want to range slice queries. Because, of the tendency to create hotspots with OrderedPartioner we decided to use RandomPartitioner. Then we would use, a row as ...
    Tharindu MathewTharindu Mathew
    Jan 23, 2012 at 10:43 am
    Feb 10, 2012 at 9:46 am
  • Hi guys, I got an architectural question about how a write operation flows through the nodes. As far as I understand now, a client sends its write operation to whatever node it was set to use and if ...
    Peter DijkshoornPeter Dijkshoorn
    Jan 23, 2012 at 3:47 pm
    Jan 24, 2012 at 9:31 am
  • We're running a 8 node cluster with different CFs for different applications. One of the application uses 1.5TB out of 1.8TB in total, but only because we started out with a deletion mechanism and ...
    Marcel SteinbachMarcel Steinbach
    Jan 21, 2012 at 9:46 am
    Jan 23, 2012 at 8:37 am
  • Hi guys, I just want to the let you know that Apache Whirr trunk (the upcoming 0.7.1 release) can deploy Cassandra 1.0.7 on AWS EC2 & Rackspace Cloud. You can give it a try by running the following ...
    Andrei SavuAndrei Savu
    Jan 18, 2012 at 1:00 pm
    Jan 19, 2012 at 2:06 pm
  • Hi all, I'm trying to copy a column family from our production cluster to our development one for testing purposes, so I thought I would try the bulkload API. Since I'm lazy, I'm using the Cassandra ...
    Scott FinesScott Fines
    Jan 13, 2012 at 2:33 pm
    Jan 18, 2012 at 1:25 pm
  • I was just trying it but ... in 0.7 CLI there is no show schema command.When I connect with 1.0 CLI to my 0.7 cluster ... [default@social] show schema;null I always get a "null" as answer! :-|Any tip ...
    Jan 9, 2012 at 10:50 am
    Jan 11, 2012 at 10:21 am
  • I am trying to understand the composite type. Is this a right way to create a Composite Data ? <<CF Follower_For_Users <<RowKey #{"userID",n}:"followerID" for simplicity I have replaced userID by ...
    Jan 6, 2012 at 6:30 pm
    Jan 9, 2012 at 8:37 pm
  • Hi Everybody, JConsole tells me I've got CompactionReducer threads stacking up, consuming memory, and never going away. Eventually, my Java process fails because it can't allocate any more native ...
    Caleb RackliffeCaleb Rackliffe
    Jan 8, 2012 at 2:52 am
    Jan 9, 2012 at 9:54 am
  • Hi Everybody, I have a 10-node cluster running 1.0.5. The hardware/configuration for each box looks like this: Hardware: 4 GB RAM, 400 GB SATAII HD for commitlog, 50 GB SATAIII SSD for data ...
    Caleb RackliffeCaleb Rackliffe
    Jan 6, 2012 at 8:29 pm
    Jan 7, 2012 at 9:01 am
  • I am storing composite column names which are made up of two integer components. However I am shocked after seeing the storage overhead of these. I just tried out a composite name (with single ...
    Ertio LewErtio Lew
    Jan 2, 2012 at 5:26 am
    Jan 2, 2012 at 12:09 pm
  • Hi! On the http://wiki.apache.org/cassandra/Operations#Dealing_with_the_consequences_of_nodetool_repair_not_running_within_GCGraceSeconds you can read: "To minimize the amount of forgotten deletes, ...
    Jan 9, 2012 at 8:35 am
    Oct 8, 2012 at 8:25 pm
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147 users for January 2012

Aaron morton: 110 posts R. Verlangen: 27 posts Maxim Potekhin: 26 posts Philippe: 15 posts Віталій Тимчишин: 15 posts Mohit Anchlia: 13 posts Michael Vaknine: 11 posts Sylvain Lebresne: 10 posts Bryce Allen: 9 posts Jeremiah Jordan: 9 posts Marcel Steinbach: 9 posts Peter Schuller: 9 posts Brian O'Neill: 8 posts Thorsten von Eicken: 8 posts Caleb Rackliffe: 7 posts Carlo Pires: 7 posts Cbertu81: 7 posts Ertio Lew: 7 posts Ruslan usifov: 7 posts Tamar Fraenkel: 7 posts
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