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186 discussions - 932 posts

  • I have a basic understanding of how Cassandra handles the file system (flushes in Memtables out to SSTables, SSTables get compacted) and I understand that old files are only deleted when a node is ...
    Konstantin NaryshkinKonstantin Naryshkin
    May 26, 2011 at 6:10 pm
    Jun 16, 2011 at 3:27 am
  • Hey guys, I have a ec2 debian cluster consisting of several nodes running 0.7.5 on ephimeral disks. These are fresh installs and not upgrades. The commitlog is set to the smaller of the disks which ...
    Sanjeev KulkarniSanjeev Kulkarni
    May 12, 2011 at 6:31 pm
    May 19, 2011 at 5:09 pm
  • Hi, First time here. I'm having trouble adding a third node to an existing 2-node ring (successfully upgraded from 0.72) running cassandra 0.8rc1 (successfully upgraded from 0.72) on ubuntu on EC2 ...
    Marcus BointonMarcus Bointon
    May 24, 2011 at 3:36 pm
    May 26, 2011 at 9:42 pm
  • I am experiencing an issue where replication is not being distributed between racks when using PropertyFileSnitch in conjunction with NetworkTopologyStrategy. I am running 0.7.3 from a tar.gz on ...
    Eric tammeEric tamme
    May 2, 2011 at 6:41 pm
    May 4, 2011 at 3:06 pm
  • We can't do a straight upgrade from 0.6.13 to 0.7.5 because we have rows stored that have unicode keys, and Cassandra 0.7.5 thinks those rows in the sstables are corrupt, and it seems impossible to ...
    Henrik SchröderHenrik Schröder
    May 5, 2011 at 5:52 pm
    May 9, 2011 at 9:33 am
  • Hi, We are using Cassandra 0.6.12 in a cluster of 9 nodes. Each node is 64-bit, has 4 cores and 4G of RAM and runs on Ubuntu Lucid with the stock 2.6.32-31-generic kernel. We use the Sun/Oracle JDK ...
    Hannes SchmidtHannes Schmidt
    May 4, 2011 at 6:50 pm
    May 18, 2011 at 10:27 pm
  • Even with the current concurrent compactions, given a high speed datafeed, compactions will obviously start lagging at some stage, and once it does, things can turn bad in terms of disk usage and ...
    Terje MarthinussenTerje Marthinussen
    May 7, 2011 at 9:02 am
    May 11, 2011 at 1:55 pm
  • Hey everyone, We did some tests before upgrading our Cassandra cluster from 0.6 to 0.7, just to make sure that the change in how keys are encoded wouldn't cause us any dataloss. Unfortunately it ...
    Henrik SchröderHenrik Schröder
    May 3, 2011 at 3:16 pm
    May 5, 2011 at 5:28 pm
  • Hi, I am new to cassandra. I am trying to start the Cassandra single node setup using the command bin/cassandra -f. But there is no response from the prompt.. this is what it shows INFO 14:13:45,867 ...
    Amrita JayakumarAmrita Jayakumar
    May 30, 2011 at 9:00 am
    May 31, 2011 at 7:21 am
  • I'm having problems administering my cluster because I have too many CFs (~40). I'm thinking of combining them all into one big CF. I would prefix the current CF name to the keys, repeat the CF name ...
    David BoxenhornDavid Boxenhorn
    May 1, 2011 at 11:03 am
    May 2, 2011 at 5:13 pm
  • Cassandra 0.8 beta trunk from about 1 week ago: Pool Name Active Pending Completed ReadStage 0 0 5 RequestResponseStage 0 0 87129 MutationStage 0 0 187298 ReadRepairStage 0 0 0 ReplicateOnWriteStage ...
    Terje MarthinussenTerje Marthinussen
    May 3, 2011 at 5:57 pm
    May 4, 2011 at 2:11 pm
  • I have log files of the format <id <key <value . I want to load these files into cassandra using PHPcassa. I have installed Cassandra 7. Can anyone please guide me with the exact procedures as in how ...
    Amrita JayakumarAmrita Jayakumar
    May 31, 2011 at 2:04 pm
    Jun 1, 2011 at 8:07 am
  • Hi all I'm a bit lost: I tried a repair yesterday with only one CF and that didn't really work the way I expected but I thought that would be a bug which only affects that special case. So I tried ...
    Daniel DoubledayDaniel Doubleday
    May 23, 2011 at 5:17 pm
    May 25, 2011 at 8:07 am
  • Hi All, I have two questions: a) Is there a way to turn on and off hinted handoff per keyspace rather than for multiple keyspaces. b)It looks like cassandra stores hinted handoff data in one row.Is ...
    Anurag GujralAnurag Gujral
    May 12, 2011 at 6:49 pm
    May 14, 2011 at 10:02 am
  • Greetings, I'm experiencing some issues with 2 nodes (out of more than 10). Right after startup (Listening for thrift clients...) the nodes will create objects at high rate using all available CPU ...
    Gabriel TataranuGabriel Tataranu
    May 11, 2011 at 6:56 pm
    May 13, 2011 at 3:47 pm
  • Hi everyone. I have a few sstables with around 500 million keys, and memory usage has grown a lot, I suppose because of the indexes. This sstables are comprised of skinny rows, but a lot of them ...
    Héctor Izquierdo SelivaHéctor Izquierdo Seliva
    May 9, 2011 at 3:50 pm
    May 11, 2011 at 8:48 pm
  • Hi, I have a cluster with two nodes (node A and node B) and make a test as follows: 1). set commitlog sync in batch mode and the sync batch window in 0 ms 2). one client wrote random keys in infinite ...
    Preston ChangPreston Chang
    May 31, 2011 at 7:46 am
    Jun 7, 2011 at 3:24 pm
  • Hi all, We are trying to use MD5 encrypted passwords. Quick question first - Is SHA-2 supported yet? US-CERT of the U. S. Department of Homeland Security has said that MD5 "should be considered ...
    Sameer FarooquiSameer Farooqui
    May 16, 2011 at 10:55 pm
    May 19, 2011 at 1:12 pm
  • Hey guys, I'm running into what seems like a very basic problem. I have a one node cassandra instance. Version 0.7.5. Freshly installed. Contains no data. The cassandra.yaml is the same as the ...
    Sanjeev KulkarniSanjeev Kulkarni
    May 5, 2011 at 7:19 am
    May 9, 2011 at 8:33 pm
  • I'm wondering how cassandra implements appending values to fields. Since (so the docs tell me) there's not really any such thing such thing as an update in Cassandra, I wonder if it falls into the ...
    Marcus BointonMarcus Bointon
    May 31, 2011 at 7:23 pm
    Jun 1, 2011 at 5:11 pm
  • Environment : java 64 bit server, java client, thrift get_slice method, Cassandra 0.7.4, single node Depending on the data I pass for a query on a CF I get the following listed below. Any suggestions ...
    Desimpel, IgnaceDesimpel, Ignace
    May 16, 2011 at 3:07 pm
    May 18, 2011 at 1:10 pm
  • Hello, It's a question on jconsole rather than cassandra, how can I invoke getNaturalEndpoints with jconsole? org.apache.cassandra.service.StorageService.Operations.getNaturalEndpoints I want to run ...
    Maki WatanabeMaki Watanabe
    May 11, 2011 at 11:15 am
    May 13, 2011 at 10:30 pm
  • is this combination feature available , or on track ? thanks Yang
    YangYang
    May 28, 2011 at 12:29 am
    May 29, 2011 at 7:10 pm
  • I recently removed a node (with decommission) from our cluster. I added a couple new nodes and am now trying to rebalance the cluster using nodetool move. However, netstats shows that the node being ...
    Jonathan ColbyJonathan Colby
    May 25, 2011 at 12:45 pm
    May 29, 2011 at 10:34 am
  • Hello, I've noticed strange behaviour of Cassandra when using secondary indexes. There are 2 Data Centers, each with 2 nodes, RF=4, on all nodes Cassandra 0.7.5 is installed. When I connect to one of ...
    Wojciech PietrzokWojciech Pietrzok
    May 15, 2011 at 9:34 pm
    May 25, 2011 at 5:23 pm
  • (sorry if Rainbird is not a topic relevant enough, I'd appreciate if someone could point me to a more appropriate venue in that case) Rainbird buffers up 1 minute worth of events first before writing ...
    YangYang
    May 20, 2011 at 9:05 pm
    May 23, 2011 at 11:56 pm
  • Hi, I am new to Cassandra and very excited with the technology. I am evaluating it and trying to understand the difference between Cassandra and Oracle Coherence. Precisely , looking for reasons why ...
    Karamel, RaghuKaramel, Raghu
    May 17, 2011 at 10:44 pm
    May 20, 2011 at 5:16 pm
  • Hello, I am using Cassandra for my application.My Cassandra client uses Thrift APIs directly. The problem I am facing currently is as follows: 1) I added a row and columns in it dynamically via ...
    Anuya joshiAnuya joshi
    May 3, 2011 at 6:35 am
    May 19, 2011 at 8:07 pm
  • Moving to user@. Your keycache is corrupt, just rm /var/lib/cassandra/saved_caches/* and try again. -Brandon
    Brandon WilliamsBrandon Williams
    May 19, 2011 at 7:46 pm
    May 20, 2011 at 6:00 pm
  • i'm new using cassandra database, i want to get data as in relationnel database: select * from table where field="value"; i see using CLI we have just the followings commands : get <ksp .<cf ['<key ...
    Karim abbouhKarim abbouh
    May 19, 2011 at 4:11 pm
    May 20, 2011 at 11:49 am
  • Hi All, I am testing network topology strategy in cassandra I am using two nodes , one node each in different data center. Since the nodes are in different dc I assigned token 0 to both the nodes. I ...
    Anurag GujralAnurag Gujral
    May 12, 2011 at 12:01 am
    May 12, 2011 at 5:52 pm
  • Hi all, I ran decommission on a node in my 32 node cluster. After about an hour of streaming files to another node, I got this error on the node being decommissioned: INFO [MiscStage:1] 2011-05-03 ...
    Tamara AlexanderTamara Alexander
    May 4, 2011 at 12:28 am
    May 6, 2011 at 1:13 am
  • Hello, I installed 0.7.5 to my Ubuntu 11.04 64 bit from package at deb http://www.apache.org/dist/cassandra/debian 07x main And I met really strange problem. Any shell command that requires ...
    Anton BelyaevAnton Belyaev
    May 11, 2011 at 8:30 pm
    Jun 17, 2011 at 7:13 am
  • hi everyone, the current nodes i have deployed (4) have all been working fine, with not a lot of data ... more reads than writes at the moment. as i had monitoring disabled, when one node's OS killed ...
    Sasha DolgySasha Dolgy
    May 31, 2011 at 10:02 am
    Jun 15, 2011 at 3:56 pm
  • Hi! I'm considering setting up a small (4-6 nodes) Cassandra cluster on machines that each have 3x2TB disks. There's no hardware RAID in the machine, and if there were, it could only stripe single ...
    Erik ForsbergErik Forsberg
    May 31, 2011 at 12:47 pm
    Jun 8, 2011 at 3:48 pm
  • Hi, I have manged to generate thrift interface for php along with implementing auto-loading of both Cassandra and thrift core class. However during my testing the only query that works as expected is ...
    Kwasi Gyasi - AgyeiKwasi Gyasi - Agyei
    May 26, 2011 at 4:16 am
    May 29, 2011 at 12:46 pm
  • Hi, I've got a strange problem, where the database on a node has inflated 10X after running repair. This is not the result of receiving missed data. I didn't perform repair within my usual 10 day ...
    Dominic WilliamsDominic Williams
    May 25, 2011 at 2:52 pm
    May 25, 2011 at 7:40 pm
  • let's say periodically (daily) I need to dump out the contents of my Cassandra DB, and do a import into oracle , or some other custom data stores, is there a way to do it? I checked that you can do ...
    YangYang
    May 23, 2011 at 4:20 am
    May 23, 2011 at 4:06 pm
  • Is there a way to view composite column names in the CLI? Is there a way to input them (i.e. in the set command)?
    David BoxenhornDavid Boxenhorn
    May 16, 2011 at 3:21 pm
    May 17, 2011 at 9:55 am
  • We're troubleshooting a memory usage problem during batch reads. We've spent the last few days profiling and trying different GC settings. The symptoms are that after a certain amount of time during ...
    Serediuk, AdamSerediuk, Adam
    May 6, 2011 at 7:26 pm
    May 14, 2011 at 11:58 am
  • Hi all, My partner and I currently using cassandra cluster to run TPC-C. We first use 2 ec2 nodes to load 20 warehouses. One(client node) has 8 cores, the other(worker node) has 4 cores. During the ...
    Xiaowei WangXiaowei Wang
    May 12, 2011 at 8:10 pm
    May 13, 2011 at 3:10 am
  • Hello, I've noticed very nice stats exposed with JMX. I was quite shocked when I saw that MaxRowSize was about 400MB (it was expected to be several MB). What is the best way to find keys of such big ...
    Meler WojciechMeler Wojciech
    May 10, 2011 at 8:41 am
    May 12, 2011 at 1:47 am
  • Hi, I am just learning Cassandra at the moment. The O'Reilly book on Cassandra says that I should be able to add the keyspace schema definition to cassandra.yaml and then invoke loadSchemaFromYAML() ...
    Jim the Standing BearJim the Standing Bear
    May 10, 2011 at 8:17 pm
    May 11, 2011 at 2:47 am
  • Hi All I have two cassandra node with RF=2,Cassandra start under performing i mean red write are slow and i see following info in cassandra log.I have centos 5.5 64 bit with 14 GB memory assigned to ...
    Ali AhsanAli Ahsan
    May 5, 2011 at 3:52 pm
    May 7, 2011 at 8:18 pm
  • Is there a spec for compound columns? I want to know the exact format of compound columns so I can adhere to it. For example, what is the separator - or is some other format used (e.g. length:value ...
    David BoxenhornDavid Boxenhorn
    May 5, 2011 at 2:44 pm
    May 5, 2011 at 3:30 pm
  • I went through https://issues.apache.org/jira/browse/CASSANDRA-1072 and realize that the consistency guarantees of Counters are a bit different from those of regular columns, so could you please ...
    YangYang
    May 31, 2011 at 12:58 am
    May 31, 2011 at 8:36 am
  • We have a 4 node cluster with a replication factor of 2. When one node dies, the other nodes throw UnavailableExceptions for quorum reads (as expected initially). They never get out of that state. Is ...
    Paul LoyPaul Loy
    May 27, 2011 at 3:37 pm
    May 27, 2011 at 6:46 pm
  • hi guys, i'm reading up on the book "Cassandra - Definitive guide" and i don't seem to understand what it says about "ranges and slices" my understanding is a range as in "a mathematical range to ...
    David leeDavid lee
    May 25, 2011 at 8:43 am
    May 26, 2011 at 2:29 am
  • Hi, I am pretty new to Cassandra and am going to use Cassandra 0.8.0. I have two questions (sorry if they are very basic ones): 1) I have a column family to hold many super columns, say 30. When I ...
    Jian FangJian Fang
    May 23, 2011 at 9:47 pm
    May 24, 2011 at 5:41 pm
  • I have a test node system running release 0.8rc1. I rebooted node3 and now Cassandra is failing on startup. Any ideas? I am not sure where to begin. Debian 6, plenty of disk space, Cassandra 0.8rc1 ...
    Scott McPheetersScott McPheeters
    May 23, 2011 at 6:18 pm
    May 24, 2011 at 1:06 pm
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157 users for May 2011

Aaron Morton: 106 posts Jonathan Ellis: 104 posts Sylvain Lebresne: 31 posts Sameer Farooqui: 29 posts Anurag Gujral: 22 posts David Boxenhorn: 22 posts Yangyangyyy: 22 posts Peter Schuller: 21 posts Watanabe Maki: 21 posts Terje Marthinussen: 20 posts Daniel Doubleday: 16 posts Eric tamme: 16 posts Sanjeev Kulkarni: 15 posts Jeffrey Kesselman: 14 posts Jonathan Colby: 14 posts Marcus Bointon: 14 posts Ali Ahsan: 13 posts Edward Capriolo: 13 posts Jeremy Hanna: 13 posts Mcasandra: 13 posts
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