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112 discussions - 465 posts

  • All, We've been having intermittent long application pauses (version 1.2.8) and not sure if it's a cassandra bug. During these pauses, there are dropped messages in the cassandra log file along with ...
    Frank NgFrank Ng
    Jan 29, 2014 at 6:07 pm
    Apr 14, 2014 at 7:40 pm
  • Hi Using Cassandra 2.0.0. 3 node cluster Replication 2. Using consistency ALL for both read and writes. I have a single thread that reads a value, updates it and writes it back to the table. The ...
    Manoj KhangaonkarManoj Khangaonkar
    Jan 10, 2014 at 9:50 pm
    Jan 11, 2014 at 1:31 am
  • Hi all. I have many GC freezes on my cassandra cluster Im using G1 GC and CMS gives similar freezes JVM_OPTS="$JVM_OPTS -XX:+UseG1GC" JVM_OPTS="$JVM_OPTS -XX:SurvivorRatio=1" JVM_OPTS="$JVM_OPTS ...
    Jan 14, 2014 at 1:16 pm
    Jan 20, 2014 at 9:56 am
  • Hi! I'm a little worried about the data model I have come up with for handling highscores. I have a lot of users. Each user has a number of friends. I need a highscore list pr friend list. I would ...
    Kasper Middelboe PetersenKasper Middelboe Petersen
    Jan 22, 2014 at 5:44 pm
    Jan 24, 2014 at 8:20 am
  • Hi all, I have a use case with huge data which i am not able to design in cassandra. Table name : MetricResult Sample Data : Metric=Sales, Time=Month, Period=Jan-10, Tag=U.S.A, Tag=Pen, Value=10 ...
    Naresh YadavNaresh Yadav
    Jan 9, 2014 at 1:16 pm
    Jan 10, 2014 at 3:02 pm
  • Hi all, I would appreciate an advice whether is a good idea to upgrade from cassandra 1.2.3 to 1.2.13 and how to best proceed. The particular cluster consists of 3 nodes (each one in a different DC ...
    Jiri HorkyJiri Horky
    Jan 8, 2014 at 9:19 am
    Jan 22, 2014 at 1:01 am
  • I have a simple set of tables that can be grouped as follows: 1. Regular values, no deletes, no overwrites, write heavy, ttl's to manage size 2. Regular values, no deletes, some overwrites, read ...
    Laing, MichaelLaing, Michael
    Jan 25, 2014 at 10:55 pm
    Feb 6, 2014 at 11:03 am
  • Hello all I've read some materials on the net about Cassandra anti patterns, among which is mentionned the very large wide-row anti pattern. The main rationale to avoid too wide rows are: 1) ...
    DuyHai DoanDuyHai Doan
    Jan 31, 2014 at 2:53 pm
    Feb 4, 2014 at 9:40 pm
  • Hello, I have a multi region cluster with 3 nodes in each data center, ec2 us-east and and west. Prior to upgrading to 2.0.2 from 1.2.6, the owns % of each node was 100%, which made sense because I ...
    Mullen, RobertMullen, Robert
    Jan 3, 2014 at 11:33 pm
    Jan 6, 2014 at 4:13 pm
  • Dear experts, We are facing a annoying problem in our cluster. We have 9 amazon extra large linux nodes, running Cassandra 1.2.11. The short story is that after moving the data from one cluster to ...
    Francisco Nogueira Calmon SobralFrancisco Nogueira Calmon Sobral
    Jan 29, 2014 at 1:11 pm
    Mar 14, 2014 at 11:25 pm
  • Hey Guys, I’m new to CQL (but have been using C* for a while now). What would be the best way to model a users table using CQL/Cassandra 2.0 Lightweight Transactions where we would like to have: - A ...
    Drew KutcharianDrew Kutcharian
    Jan 20, 2014 at 10:15 pm
    Jan 22, 2014 at 3:48 am
  • Hi all, I am seeing a read operation delay in our small (3 node) cluster where I am testing. The "normal" latency for these operations is < 2ms as recorded by our load client. This holds easily ...
    Thunder StumpgesThunder Stumpges
    Jan 2, 2014 at 10:06 pm
    Jan 7, 2014 at 7:21 pm
  • I have a simple column family like the following create table people( company_id text, employee_id text, gender text, primary key(company_id, employee_id) ); if I want to find out all the "male" ...
    Jimmy LinJimmy Lin
    Jan 28, 2014 at 5:40 pm
    Jan 31, 2014 at 7:07 am
  • Sorry for the odd subject but something is wrong with our cassandra ring. We have a 9 node ring as below. N1 - UP/NORMAL N2 - UP/NORMAL N3 - UP/NORMAL N4 - UP/NORMAL N5 - UP/NORMAL N6 - UP/NORMAL N7 ...
    Narendra SharmaNarendra Sharma
    Jan 15, 2014 at 9:03 pm
    Jan 17, 2014 at 12:09 am
  • Hi, All, I'm new to Cassandra. I want to know how to add a DC to existing Cassandra cluster (all running Cassandra 2.x). I found a related document at ...
    Lu, BoyingLu, Boying
    Jan 21, 2014 at 10:14 am
    Mar 11, 2014 at 2:33 pm
  • Hi all, Urgently need help on modelling this usecase on Cassandra. I have concept of tags and tagcombinations. For example U.S.A and Pen are two tags AND if they come together in some definition then ...
    Naresh YadavNaresh Yadav
    Jan 27, 2014 at 12:24 pm
    Jan 28, 2014 at 10:20 pm
  • Hi, Trying CAS feature of cassandra 2.x and somehow getting given below error: cqlsh:sample insert into "User"(user_id,first_name) values( fe08e810-81e4-11e3-9470-c3aa8ce77cc4,'vivek1') if not ...
    Vivek MishraVivek Mishra
    Jan 20, 2014 at 3:17 pm
    Jan 21, 2014 at 6:13 am
  • Hi all, What is the latest stable version of cassandra you have in production ? We are migrating a large chunk of our mysql database to cassandra. I see a lot of discussions regarding 1.* versions, ...
    Sanjeeth KumarSanjeeth Kumar
    Jan 9, 2014 at 2:37 am
    Jan 9, 2014 at 10:50 pm
  • Hello, I have a little question, i used to use OPSCENTER TARBALL distribution without any licence: it works. But when i try to install OPSCENTER ENTREPRISE EDITION to take advantages of backup and ...
    Bonnet Jonathan.Bonnet Jonathan.
    Jan 22, 2014 at 4:41 pm
    Jan 27, 2014 at 11:07 am
  • Pretty reliable, at some point, nodes will have super long GCs. Followed by https://issues.apache.org/jira/browse/CASSANDRA-6592 Lovely log messages: 9030.798: [ParNew (0: promotion failure size = ...
    John WatsonJohn Watson
    Jan 21, 2014 at 8:03 am
    Jan 22, 2014 at 10:04 pm
  • I¹ve seen a number of people on this forum that have run into a variety of issues when creating a lot of tombstones. This makes me concerned about an application that I¹m writing. It works great on ...
    Robert WilleRobert Wille
    Jan 1, 2014 at 1:54 pm
    Jan 11, 2014 at 3:47 am
  • Hi, I am trying to understand "Owns" here. AFAIK, it is range(part of keyspace). Not able to understand why is it shown as 100%? Is it because of effective ownership? Address Rack Status State Load ...
    Vivek MishraVivek Mishra
    Jan 2, 2014 at 6:20 pm
    Jan 10, 2014 at 1:05 am
  • Hello all, Just wanted to check if anyone has any experiences to share regarding 1. the stability of vnodes in production 2. upgrading to vnodes in production We recently upgraded to 1.2.12 in ...
    Arindam BaruaArindam Barua
    Jan 2, 2014 at 6:52 pm
    Jan 6, 2014 at 10:45 pm
  • 8 node cluster running in aws. Any pointers where I should start looking? No kill -9 in history.
    Narendra SharmaNarendra Sharma
    Jan 2, 2014 at 4:14 pm
    Jan 3, 2014 at 6:21 pm
  • The repo: https://github.com/edwardcapriolo/farsandra The code: Farsandra fs = new Farsandra(); fs.withVersion("2.0.4"); fs.withCleanInstanceOnStart(true); fs.withInstanceName("1") ...
    Edward CaprioloEdward Capriolo
    Jan 22, 2014 at 3:06 pm
    Jan 29, 2014 at 2:21 pm
  • Does C* no long use zookeeper? I don't see a reference to it in the https://github.com/apache/cassandra/blob/trunk/build.xml If not, what replaced it?
    S AhmedS Ahmed
    Jan 28, 2014 at 3:19 pm
    Jan 28, 2014 at 7:27 pm
  • I am unable to find any references on if the tabs to monitor multiple DC can be configure to read the DC location. I do not want to change the cluster name itself. Right now I see three tabs all with ...
    Daniel CurryDaniel Curry
    Jan 23, 2014 at 5:08 pm
    Jan 24, 2014 at 11:51 pm
  • Hello list, I was if anyone has any pointers or some advise regarding using row cache vs leaving it up to the OS buffer cache. I run cassandra 1.1 and 1.2 with JNA, so off-heap row cache is an ...
    Katriel TraumKatriel Traum
    Jan 23, 2014 at 7:13 am
    Jan 23, 2014 at 8:52 pm
  • Hi, On C* 2.0.0. 3 Node cluster. I have a column daycount list<BigInt . The column is storing a count. Every few secs a new count is appended. The total count for the day is the sum of all items in ...
    Manoj KhangaonkarManoj Khangaonkar
    Jan 23, 2014 at 2:18 am
    Jan 23, 2014 at 7:30 pm
  • Hi, I'm looking to move from a relational DB to Cassandra. I just found that there are intra-table relationships in one table where the ids of the related rows are saved in a 'parent' row. How can ...
    Les HartzmanLes Hartzman
    Jan 22, 2014 at 1:24 am
    Jan 22, 2014 at 6:32 pm
  • Hi, In order to upgrade our env from 1.0.9 to 2.0 I thought about the following steps: - Creating a new 1.0.9 cluster - Creating the keyspaces and column families (I need to move one keyspace data to ...
    Or SherOr Sher
    Jan 16, 2014 at 10:05 am
    Jan 22, 2014 at 10:36 am
  • Hi, We have a two node cluster with the replication factor of 2. The db has more than 2500 column families(tables). The nodetool -pr repair on an empty database(one or table has a litter data) takes ...
    Logendran, Dharsan (Dharsan)Logendran, Dharsan (Dharsan)
    Jan 20, 2014 at 10:48 pm
    Jan 22, 2014 at 9:32 am
  • Hi , I’m hitting a very odd issue with HintedHandoff on 1 node in my 12 node cluster running 1.2.13. Somehow it’s holding a large amount of hints for tokens that have never been part of the cluster ...
    Allan CAllan C
    Jan 20, 2014 at 8:19 pm
    Jan 20, 2014 at 9:25 pm
  • Hi, I have two nodes with Cassandra 2.0.3, where repair sessions hang for an undefinite time. I'm running nodetool repair once a week on every node, on different days. Currently I have like 4 repair ...
    Paolo CrosatoPaolo Crosato
    Jan 8, 2014 at 4:53 pm
    Jan 14, 2014 at 9:04 am
  • Hello I'm getting stack overflow when running prepared queries with IN parameter and binding big list in it. Is it known limitation and I must implement manual paging or change logic to get around ...
    Дмитрий ШоховДмитрий Шохов
    Jan 10, 2014 at 1:08 pm
    Jan 11, 2014 at 3:35 am
  • This has not reached a consensus in #cassandra in the past. Does `nodetool cleanup` also remove data that has expired from a TTL?
    Chris BurroughsChris Burroughs
    Jan 7, 2014 at 1:48 pm
    Jan 10, 2014 at 1:50 am
  • Hi, I’ve been having a problem with 3 neighboring nodes in our cluster having their read latencies jump up to 9000ms - 18000ms for a few minutes (as reported by opscenter), then come back down. We’re ...
    Blake EgglestonBlake Eggleston
    Jan 5, 2014 at 11:29 pm
    Jan 10, 2014 at 1:38 am
  • Hey all, I'd like to be able to make calls to the cassandra database using PHP. I've taken a look around but I've only found solutions out there for Ubuntu and other distros. But my environment is ...
    Tim DunphyTim Dunphy
    Jan 13, 2014 at 7:12 am
    Mar 4, 2014 at 11:15 pm
  • We have two datacenters, DC1 and DC2 in our test cluster. Our write process uses a connection string with just the two hosts in DC1. Our read process uses a connection string just with the two hosts ...
    Donald SmithDonald Smith
    Jan 30, 2014 at 1:08 am
    Feb 6, 2014 at 1:34 pm
  • I read through the recent thread "Cassandra mad GC", which seemed very similar to my situation, but didn¹t really help. Here is what I get from my logs when I grep for GCInspector. Note that this is ...
    Robert WilleRobert Wille
    Jan 29, 2014 at 11:07 am
    Feb 6, 2014 at 11:34 am
  • Hi, We've been trying to figure out why we have so long and frequent stop-the-world GC even though we have basically no load. Today we got a log of a weird GC that I wonder if you have any theories ...
    Joel SamuelssonJoel Samuelsson
    Jan 29, 2014 at 4:24 pm
    Jan 31, 2014 at 2:10 pm
  • Got into a problem when testing a vnode setup. I'm using a byteordered partitioner, linux, code version 2.0.4, replication factor 1, 4 machine All goes ok until I run cleanup, and gets worse when ...
    Desimpel, IgnaceDesimpel, Ignace
    Jan 29, 2014 at 3:54 pm
    Jan 30, 2014 at 12:00 pm
  • I am in process of setting 2 node cluster with C* version 2.0.4. When I started each node, it failed to communicate thus, each are running separate and not in same ring. So started looking at the log ...
    Kumar RanjanKumar Ranjan
    Jan 29, 2014 at 3:56 am
    Jan 29, 2014 at 5:44 am
  • I have a dataset which is heavy on updates. The updates are actually performed by inserting new records and deleting the old ones the following day. Some records might be updated (replaced) a ...
    Robert WilleRobert Wille
    Jan 28, 2014 at 3:57 pm
    Jan 28, 2014 at 11:53 pm
  • I am used to working with CCM for testing. For production, I depend on installing cassandra manually. Is there a proven tool to install and manage multinode cassandra cluster? If you have any ...
    Kumar RanjanKumar Ranjan
    Jan 28, 2014 at 4:34 am
    Jan 28, 2014 at 7:20 am
  • Hi! I'm bulkloading from Hadoop to Cassandra. Currently in the process of moving to new hardware for both Hadoop and Cassandra, and while testrunning bulkload, I see the following error: Exception in ...
    Erik ForsbergErik Forsberg
    Jan 27, 2014 at 11:57 am
    Jan 28, 2014 at 2:09 am
  • Hi All, Please help me to find Apache-Cassandra-2.0.4 version supported cassandra-jdbc jar file. we are planning to run java application which will access Cassandra database. Thanks Chiru
    chiru Rchiru R
    Jan 24, 2014 at 5:37 pm
    Jan 24, 2014 at 9:21 pm
  • Hi All, I am using Apache Cassandra 2.0.4 version with cassandra-jdbc-1.2.5.jar.I am trying to run sample java program. aim getting below error. Please correct me weather i am using right Jdbc driver ...
    Chiranjeevi RavillaChiranjeevi Ravilla
    Jan 22, 2014 at 5:50 pm
    Jan 24, 2014 at 2:55 pm
  • Hello, We've been having problems with long GC pauses and can't seem to get rid of them. Our latest test is on a clean machine with Ubuntu 12.04 LTS, Java 1.7.0_45 and JNA installed. It is a single ...
    Joel SamuelssonJoel Samuelsson
    Jan 22, 2014 at 2:51 pm
    Jan 23, 2014 at 11:09 pm
  • I have an app that stores lots of bits of text in Cassandra. One of the things I need to do is keep a global word frequency table. Something like this: CREATE TABLE IF NOT EXISTS word_count ( word ...
    David TinkerDavid Tinker
    Jan 17, 2014 at 6:42 am
    Jan 20, 2014 at 1:06 pm
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133 users for January 2014

Robert Coli: 37 posts Robert Wille: 17 posts Naresh Yadav: 14 posts Thunder Stumpges: 13 posts Aaron Morton: 12 posts Edward Capriolo: 12 posts Cyril Scetbon: 9 posts Jason Wee: 9 posts Rob Mullen: 9 posts Tupshin Harper: 9 posts Dimetrio: 8 posts Narendra Sharma: 8 posts Sylvain Lebresne: 8 posts Vivek Mishra: 8 posts Drew Kutcharian: 7 posts Kumar Ranjan: 7 posts Sankalp kohli: 7 posts chandra Varahala: 6 posts DuyHai Doan: 6 posts Kasper Middelboe Petersen: 6 posts
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