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112 discussions - 484 posts

  • Hi , I try to evaluate different option of spark + cassandra and I have couple of questions: My aim is to use cassandra+spark without hadoop: 1) Is it possible to use only cassandra as input/output ...
    Oleg RuchovetsOleg Ruchovets
    Sep 10, 2014 at 3:35 pm
    Sep 12, 2014 at 2:03 pm
  • Hi - We are running Cassandra 2.0.5 on AWS on m3.large instances. These instances were using EBS for storage (I know it is not recommended). We replaced the EBS storage with SSDs. However, we didn't ...
    Mohammed GullerMohammed Guller
    Sep 17, 2014 at 12:36 am
    Sep 18, 2014 at 5:14 pm
  • Hi there, We are seeing extreme slow down (500ms to 1s) in query on secondary index with vnode. I'm seeing multiple secondary index scans on a given node in trace output when vnode is enabled ...
    Jay PatelJay Patel
    Sep 19, 2014 at 1:34 am
    Sep 20, 2014 at 2:45 am
  • Hello, I have a node that is in MutationStage for the last 5 hours. Actually the node is *down*. The pendings task go from 776 to 110 and then to 964. There are some way to finish this stage? The ...
    Eduardo CusaEduardo Cusa
    Sep 10, 2014 at 6:39 pm
    Sep 11, 2014 at 10:34 pm
  • I am fairly new to Cassandra. We have a 9 node cluster, 5 in one DC and 4 in another. Running a repair on a large column family seems to be moving much slower than I expect. Looking at nodetool ...
    Gene RobichauxGene Robichaux
    Sep 26, 2014 at 4:53 pm
    Sep 30, 2014 at 6:39 am
  • Hi, I'm currently testing Cassandra 2.0.9 (and since the last week 2.1) under some read heavy load... I have 2 cassandra nodes (RF : 2) running under CentOS 6 with 16GB of RAM and 8 Cores. I have ...
    Leleu EricLeleu Eric
    Sep 22, 2014 at 4:40 pm
    Sep 24, 2014 at 10:01 am
  • Hi all: A client on a RDBMS faces quick index fragmentations, statistics become inaccurate. Many within 4 hours (fast updates + writes, but mostly updates). I am looking into replacing the RDBMS with ...
    Arthur ZubarevArthur Zubarev
    Sep 28, 2014 at 2:55 pm
    Oct 6, 2014 at 8:55 pm
  • Hi , Where can I find the document with best practices about sizing for cassandra deployment? We have 1000 writes / reads per second. record size 1k. Questions: 1) how many machines do we need? 2) ...
    Oleg RuchovetsOleg Ruchovets
    Sep 9, 2014 at 6:03 pm
    Sep 10, 2014 at 1:09 am
  • Say I want to do a rolling restart of Cassandra… I can’t just restart all of them because they need some time to gossip and for that gossip to get to all nodes. What is the best strategy for this. It ...
    Kevin BurtonKevin Burton
    Sep 16, 2014 at 5:44 pm
    Sep 20, 2014 at 3:27 am
  • Team, I am pretty new to cassandra (with just 2 weeks of playing around with it on and off) and planning a fresh deployment with 2.1 release. The data-model is pretty simple for my use-case ...
    Ram NRam N
    Sep 13, 2014 at 10:50 pm
    Sep 18, 2014 at 4:50 am
  • The Cassandra team is pleased to announce the release of the final version of Apache Cassandra 2.1.0. Cassandra 2.1.0 brings a number of new features and improvements including (but not limited to) ...
    Sylvain LebresneSylvain Lebresne
    Sep 11, 2014 at 3:05 pm
    Sep 17, 2014 at 8:37 pm
  • Hi all, We are migrating a small cluster on AWS from instances based on spinning disks (using instance store) to SSD-backed instances and we're trying to pick the proper instance type. Some of the ...
    Steve RobenaltSteve Robenalt
    Sep 5, 2014 at 12:06 am
    Sep 5, 2014 at 8:50 pm
  • Hi there, I am using leveled compaction strategy and have many sstable files. The error was during the startup, so any idea about this?
    Yatong ZhangYatong Zhang
    Sep 17, 2014 at 2:43 pm
    Sep 18, 2014 at 10:08 pm
  • Hi there, I just encountered an error which left a log '/hs_err_pid3013.log'. So is there a way to solve this? #
    Yatong ZhangYatong Zhang
    Sep 16, 2014 at 12:56 am
    Sep 18, 2014 at 10:04 pm
  • I'm using the Cassandra 2.0.9 with JAVA datastax driver. I'm running the tests in a cluster with 3 nodes, RF=3 and CL=ALL for each operation. I have a Column family filled with some keys (for example ...
    Sávio S. Teles de OliveiraSávio S. Teles de Oliveira
    Sep 17, 2014 at 6:55 pm
    Sep 17, 2014 at 8:22 pm
  • Hello all, Is there a method to quickly load a large dataset into the row cache? I use row caching as I want the entire dataset to be in memory. I'm running a Cassandra-1.2 database server with a ...
    Danny ChanDanny Chan
    Sep 9, 2014 at 7:11 pm
    Sep 15, 2014 at 6:10 pm
  • Is there any serious difference in the used disk and memory storage between upsert and delete + insert ? e.g. 2 vs 2A + 2B. PK ((key), version, c1) 1. INSERT INTO A (key , version , c1, val) values ...
    Michal BudzynMichal Budzyn
    Sep 10, 2014 at 3:49 pm
    Sep 10, 2014 at 8:28 pm
  • The questions are for Cassandra 1.0.8 but may apply to later versions too. 1) When the coordinator notices that a node it is collecting hints for is down for more than the max hint window, it stops ...
    Rahul NeelakantanRahul Neelakantan
    Sep 5, 2014 at 1:13 pm
    Sep 10, 2014 at 10:24 am
  • Hello, I'm looking to convert our recently upgraded Cassandra cluster from a single token per node to using vnodes. We've determined that based on our data consistency and usage patterns that ...
    Tim HeckmanTim Heckman
    Sep 8, 2014 at 6:08 pm
    Sep 8, 2014 at 10:00 pm
  • Hi All. I Have a Cluster in Amazon with the following settings: * 2 Nodes M3.Large * Cassandra 2.0.7 * Default instaltion on ubuntu And I have one table with 5.000.000 rows: CREATE TABLE track_user ( ...
    Eduardo CusaEduardo Cusa
    Sep 1, 2014 at 9:22 pm
    Sep 2, 2014 at 4:37 pm
  • Hi All, I have a 7 node cluster. One node ran out of disk space and others are around 80% disk utilization. The data has 10 days TTL but I think compaction wasn't fast enough to clean up the expired ...
    CemCem
    Sep 30, 2014 at 9:50 pm
    Oct 2, 2014 at 7:50 am
  • I have a table structure like below - CREATE TABLE client_data ( client_id int, consumer_id text, last_modified_date timestamp, PRIMARY KEY (client_id, last_modified_date, consumer_id) ) I have a ...
    Check PeckCheck Peck
    Sep 23, 2014 at 10:24 pm
    Sep 24, 2014 at 5:54 pm
  • Hello, Has anyone backported incremental replacement of compacted SSTables (CASSANDRA-6916) to 2.0? Is it doable or there are many dependencies introduced in 2.1? Haven't checked the ticket detail ...
    Paulo Ricardo Motta GomesPaulo Ricardo Motta Gomes
    Sep 16, 2014 at 9:57 pm
    Sep 16, 2014 at 11:52 pm
  • Hello. http://stackoverflow.com/questions/19969329/why-not-enable-virtual-node-in-an-hadoop-node/19974621#19974621 Based on this stackoverflow question, vnodes effect the number of mappers Hadoop ...
    Eric PloweEric Plowe
    Sep 15, 2014 at 11:58 pm
    Sep 16, 2014 at 12:33 pm
  • Dear Colleagues: I need to move Cassandra from EC2 classic into VPC. What I was thinking is that I can create a new data center within VPC and rebuild it from my existing one (switching to vnodes ...
    Oleg DulinOleg Dulin
    Sep 8, 2014 at 7:35 pm
    Sep 9, 2014 at 7:40 pm
  • Hi All, Just come across this one, I’m at a bit of a loss on how to fix it. A user here did the following steps On a MAC Install Datastax Enterprise (DSE) using the dmg file test he can connect using ...
    Andrew CobleyAndrew Cobley
    Sep 29, 2014 at 1:45 pm
    Sep 30, 2014 at 12:32 pm
  • Hi, I would like to define schema for a table where the column (cell) names are defined dynamically. Apparently there is a way to do this in Thrift ( ...
    ShahabShahab
    Sep 24, 2014 at 11:11 am
    Sep 29, 2014 at 9:23 pm
  • I have recently started working with Cassandra. We have cassandra cluster which is using DSE 4.0 version and has VNODES enabled. We have a tables like this - Below is my first table - CREATE TABLE ...
    Check PeckCheck Peck
    Sep 17, 2014 at 8:01 pm
    Oct 6, 2014 at 6:27 pm
  • I’m trying to query an entire table in parallel by splitting it up in token ranges. However, it’s not working because I get this: cqlsh:blogindex select token(hashcode), hashcode from source where ...
    Kevin BurtonKevin Burton
    Sep 28, 2014 at 6:40 pm
    Sep 28, 2014 at 11:15 pm
  • Hi, this is an issue that has happened a few times. We are using DSE 4.0 One of the Cassandra nodes is detected as dead by the opscenter even though I can see the process is up. the logs show heap ...
    Prem YadavPrem Yadav
    Sep 24, 2014 at 4:32 pm
    Sep 25, 2014 at 11:12 am
  • My company is using an RDBMS for storing time-series data. This application was developed before Cassandra and NoSQL. I'd like to move to C*, but ... The application supports data coming from ...
    Les HartzmanLes Hartzman
    Sep 19, 2014 at 9:47 pm
    Sep 22, 2014 at 6:15 pm
  • I am trying to use wide rows concept in my data modelling design for Cassandra. We are using Cassandra 2.0.6. CREATE TABLE test_data ( test_id int, client_name text, record_data text, creation_date ...
    Check PeckCheck Peck
    Sep 19, 2014 at 3:42 pm
    Sep 19, 2014 at 4:03 pm
  • Just upgraded cassandra to 2.1 on my own box and when I try to connect to our server running 2.0.7, I get the following error. Connection error: ('Unable to connect to any servers', {'10.0.16.144' ...
    Tyler TolleyTyler Tolley
    Sep 17, 2014 at 9:34 pm
    Sep 18, 2014 at 3:53 pm
  • Hi all, After reading some docs, I find that bloom filter is built on row keys, not on column key. Can anyone tell me what is considered for not building bloom filter on column key? Is it a good idea ...
    Philo YangPhilo Yang
    Sep 14, 2014 at 6:23 pm
    Sep 17, 2014 at 7:37 am
  • Hi. As I see massive data processing tools (map\reduce) with C* data include connectors - Calliope http://tuplejump.github.io/calliope/ - Datastax spark cassandra connector ...
    Platon.temaPlaton.tema
    Sep 16, 2014 at 8:58 am
    Sep 16, 2014 at 1:19 pm
  • When setting up a new (additional) data center, the documentation tells us to use "nodetool rebuild -- <old dc " to fill up the node(s) in the new dc, and to disable auto_bootstrap. I'm wondering if ...
    Tom van den BergeTom van den Berge
    Sep 11, 2014 at 8:19 pm
    Sep 12, 2014 at 3:47 pm
  • Hi, Cassandra setup: * 2 nodes on EC2, m1.large * Cassandra version 2.0.10 One node died over the weekend, and I couldn't revive it. I deleted it with nodetool removenode, and added a new node with a ...
    Bram AvontuurBram Avontuur
    Sep 2, 2014 at 7:24 pm
    Sep 3, 2014 at 9:58 pm
  • Looking through the CQL 3.1 grammar for Cassandra 2.1, I noticed that the not-equals operator (!=) is in the grammar definition, but I can't seem to find any legal way to use it. Is != supported as ...
    Timmy TurnerTimmy Turner
    Sep 29, 2014 at 9:54 pm
    Oct 1, 2014 at 9:06 am
  • Hello all, I can successfully read a file to a ByteBuffer and then write to a Cassandra blob column. However, when I retrieve the value of the column, the size of the ByteBuffer retrieved is bigger ...
    Carlos ScheideckerCarlos Scheidecker
    Sep 22, 2014 at 10:51 am
    Sep 30, 2014 at 9:12 am
  • Hi, I have run cassandra-stress write and cassandra-stress read on my office PC and on my home PC. Office PC : Intel Core i7-4479, 8 virtual core, 16G RAM, 500G SSD Home PC : Intel Xeon E3-1230V3, 8 ...
    Shing Hing ManShing Hing Man
    Sep 26, 2014 at 9:39 pm
    Sep 29, 2014 at 6:49 pm
  • I need a way to do a full table scan across all of our data. Can’t I just use token() for this? This way I could split up our entire keyspace into say 1024 chunks, and then have one activemq task ...
    Kevin BurtonKevin Burton
    Sep 27, 2014 at 9:43 pm
    Sep 29, 2014 at 1:35 pm
  • We're using cassandra as a key-value store; our values are small. So we're thinking we don't need much disk readahead (e.g., "blockdev -getra /dev/sda"). We're using SSDs. When cassandra does disk ...
    Donald SmithDonald Smith
    Sep 24, 2014 at 8:07 pm
    Sep 25, 2014 at 9:06 pm
  • I have a 6 (i2.2xlarge) node cluster on AWS with 4.5 DSE running on it. I notice high compaction pending on one of the node around 35. Compaction throughput set to 64 MB and flush writes to 4. Any ...
    Arun sirimallaArun sirimalla
    Sep 23, 2014 at 12:58 am
    Sep 23, 2014 at 4:12 am
  • Hey all, I've just upgraded to the latest cassandra on my site with version 2.1.0. But now when I run the command I am getting the following error: [root@beta-new:/usr/local] #cqlsh Traceback (most ...
    Tim DunphyTim Dunphy
    Sep 22, 2014 at 12:53 am
    Sep 22, 2014 at 8:08 pm
  • Hey all, I tried googling around to get an idea about what was new (and potentially cool) in the newest release of cassandra - 2.1.0. But all that I've been able to find so far is this kind of ...
    Tim DunphyTim Dunphy
    Sep 19, 2014 at 1:33 pm
    Sep 20, 2014 at 3:35 am
  • Hi, Wondering when 2.0.10 will be available through the datastax apt repository? -Karl
    Karl RiebKarl Rieb
    Sep 12, 2014 at 8:50 pm
    Sep 16, 2014 at 12:49 am
  • Hi All. Is multi datacenter replication capability available in community addition? If yes can someone share the experience how stable is it and where can I read the best practice of it? Thanks Oleg.
    Oleg RuchovetsOleg Ruchovets
    Sep 10, 2014 at 2:59 pm
    Sep 10, 2014 at 4:25 pm
  • Hi all, Yesterday I put a lot of blobs into Cassandra and it created many, probably compaction, pending tasks (few hundreds according to Ops Center). On all nodes all pending tasks were eventually ...
    Pavel KoganPavel Kogan
    Sep 4, 2014 at 3:10 pm
    Sep 4, 2014 at 7:05 pm
  • We use Cassandra 2.0.8. Probably after decommissioning nodes long time ago, but I am not sure. We are not using this cluster intensively. According to Jira, this problem was fixed in 2.0.5 ...
    Pavel KoganPavel Kogan
    Sep 3, 2014 at 11:45 am
    Sep 3, 2014 at 3:56 pm
  • Hi all, I often have problems with code that I write that uses the DataStax Java driver to create / modify a keyspace or table and then soon after reads the metadata for the keyspace to verify that ...
    Clint KellyClint Kelly
    Sep 30, 2014 at 12:16 am
    Sep 30, 2014 at 6:17 pm
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132 users for September 2014

Robert Coli: 51 posts DuyHai Doan: 31 posts James Briggs: 15 posts Chris Lohfink: 12 posts Kevin Burton: 11 posts Eduardo Cusa: 10 posts Oleg Ruchovets: 10 posts Tyler Hobbs: 10 posts Ben Bromhead: 9 posts Donald Smith: 9 posts Jack Krupansky: 9 posts Jonathan Haddad: 9 posts Check Peck: 8 posts Graham sanderson: 8 posts Rahul Neelakantan: 8 posts Yatong Zhang: 8 posts Andrew Cobley: 6 posts Eugene Voytitsky: 6 posts Jay Patel: 6 posts Laing, Michael: 6 posts
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