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116 discussions - 545 posts

  • Hi, We are seeing an issue where data that was written to the cluster is no longer accessible after trying to expand the size of the cluster. I will try and provide as much information as possible, I ...
    Nimi Wariboko JrNimi Wariboko Jr
    Jun 9, 2013 at 12:57 am
    Jun 26, 2013 at 9:00 am
  • Hi, I'm having some problems figuring out how to append a dynamic column on a column family using the datastax java driver 1.0 and CQL3 on Cassandra 1.2.5. Below is what i'm trying: *cqlsh:simplex ...
    Joe GreenawaltJoe Greenawalt
    Jun 6, 2013 at 1:03 pm
    Jun 7, 2013 at 3:55 pm
  • I see an issues when I run high traffic to the Cassandra nodes, the heap gets full to about 94% (which is expected) but the thing that confuses me is that the heap usage never goes down after the ...
    SrmoreSrmore
    Jun 18, 2013 at 3:26 pm
    Jun 28, 2013 at 5:05 am
  • I'm experimenting with a data model that will need to ingest a lot of data that will need to be query able by time. In the example below, I want to be able to run a query like "select * from count3 ...
    Ryan, BrentRyan, Brent
    Jun 19, 2013 at 1:09 pm
    Jun 21, 2013 at 1:21 pm
  • Hi, We are running a test system with Leveled compaction on Cassandra-1.2.4. While doing an initial load of the data one of the nodes ran out of file descriptors and since then it hasn't been ...
    Franc CarterFranc Carter
    Jun 12, 2013 at 10:27 pm
    Jun 21, 2013 at 11:03 am
  • Hi, We are trialling Cassandra-1.2(.4) with Leveled compaction as it looks like it may be a win for us. The first step of testing was to push a fairly large slab of data into the Column Family - we ...
    Franc CarterFranc Carter
    Jun 7, 2013 at 4:45 am
    Jun 18, 2013 at 12:58 pm
  • in case you do not know yet, opscenter is sending certain data about your cassandra instalation back to datastax. This fact is not visibly presented to user, its same spyware crap like EHCache.
    Radim KolarRadim Kolar
    Jun 17, 2013 at 12:47 am
    Jun 21, 2013 at 1:37 am
  • Hello, I'm seeing a strange problem with a 2-node Cassandra test deployment, where it seems that data isn't being replicated among the nodes as I would expect. I suspect this may be a configuration ...
    James LeeJames Lee
    Jun 18, 2013 at 12:03 pm
    Jun 20, 2013 at 5:12 pm
  • How does one do an atomic update in a column family with a single column? I have a this CF CREATE TABLE schema_migrations ( version TEXT PRIMARY KEY, ) WITH COMPACTION = {'class' ...
    Blair ZajacBlair Zajac
    Jun 25, 2013 at 3:24 am
    Jul 1, 2013 at 7:33 pm
  • I have 4 nodes cassandra cluster. Every node has 32G memory, and the cassandra jvm uses 8G. The cluster is suffering from gc. Looks like CompactionExecutor thread holds too many SSTableReader. See ...
    SulongSulong
    Jun 26, 2013 at 5:14 am
    Jul 1, 2013 at 6:01 am
  • Hi, Does C* support something like co-processor functionality/triggers to run client-supplied code in the address space of the server?
    Tanya MalikTanya Malik
    Jun 11, 2013 at 2:13 am
    Jun 13, 2013 at 4:45 pm
  • We have deployed multi-center but got performance issue. When the nodes on other center are up, the read response time from clients is 4 or 5 times higher. when we take those nodes down, the response ...
    Daning WangDaning Wang
    Jun 8, 2013 at 4:50 am
    Jun 12, 2013 at 9:20 pm
  • I am a bit confused when using the consistency level for multi datacenter setup. Following is my setup: I have 4 nodes the way these are set up are Node 1 DC 1 - N1DC1 Node 2 DC 1 - N2DC1 Node 1 DC 2 ...
    SrmoreSrmore
    Jun 3, 2013 at 8:10 pm
    Jun 4, 2013 at 12:42 am
  • 3 node cent os CPU 8core memory 32GB cassandra 1.2.5 my scenario: many counter incr, every node has one client program, performance is 400 wps /every clicent (it’s so slowly) my question: Ø nodetool ...
    Yue.zhangYue.zhang
    Jun 24, 2013 at 3:42 am
    Oct 17, 2013 at 8:44 pm
  • We have a 3-node cassandra cluster on AWS. These nodes are running cassandra 1.2.2 and have 8GB memory. We didn't change any of the default heap or GC settings. So each node is allocating 1.8GB of ...
    Mohammed GullerMohammed Guller
    Jun 21, 2013 at 5:49 pm
    Jun 30, 2013 at 3:35 pm
  • Hi All, I have a column family with multiple columns and when I try a where clause with one of the columns that is not the "key" column Cassandra gives me an error about it not being an index ...
    Tony AnecitoTony Anecito
    Jun 26, 2013 at 4:40 pm
    Jun 27, 2013 at 9:36 am
  • Hi All, I am using jdbc driver and noticed that if I run the same query twice the second time it is much faster. I setup the row cache and column family cache and it not seem to make a difference. I ...
    Tony AnecitoTony Anecito
    Jun 21, 2013 at 8:30 pm
    Jun 24, 2013 at 3:08 pm
  • Hello, Can anyone suggest a good/popular Unit Test tools/frameworks/utilities out there for unit testing Cassandra stores? I am looking for testing from performance/load and monitoring perspective. I ...
    Shahab YunusShahab Yunus
    Jun 18, 2013 at 11:53 pm
    Jun 21, 2013 at 8:14 am
  • Hi, The default number of vnodes is 256, is there any significance in this number? Since Cassandra's vnodes don't work like for example Riak's, where there is a fixed number of vnodes distributed ...
    Theo HultbergTheo Hultberg
    Jun 10, 2013 at 2:48 pm
    Jun 11, 2013 at 9:06 am
  • Hello, We are considering using Cassandra and I want to make sure our use case fits Cassandra's strengths. We have the table like: answers ------- user_id | question_id | result | created_at Where ...
    Christopher J. BottaroChristopher J. Bottaro
    Jun 19, 2013 at 5:06 pm
    Jun 29, 2013 at 4:20 pm
  • Hi, I've seen a couple of people on Stack Overflow having problems with performance when they have maps that they continuously update, and in hindsight I think I might have run into the same problem ...
    Theo HultbergTheo Hultberg
    Jun 26, 2013 at 8:26 am
    Jun 28, 2013 at 8:14 am
  • I have a scenario here. I have a cluster A and cluster B running on cassandra 1.1. I need to copy data from Cluster A to Cluster B. Cluster A has few keyspaces that I need to copy over to Cluster B ...
    S CS C
    Jun 25, 2013 at 3:36 am
    Jun 26, 2013 at 3:06 am
  • I haven't seen this error in a long time. We just received the below error in production when rebuilding a node…any ideas on how to get around this? We had rebuilt 3 other nodes already I think(we ...
    Hiller, DeanHiller, Dean
    Jun 24, 2013 at 12:42 pm
    Jun 24, 2013 at 7:12 pm
  • Hi, I am currently using Cassandra 1.2.5 on RHEL6 with Oracle JVM. I want to try to build a bulk loader for stock prices that I have available in CSV format. However, I have started exploring ...
    Davide AnastasiaDavide Anastasia
    Jun 6, 2013 at 10:46 pm
    Jun 9, 2013 at 1:59 am
  • We need to do a rolling upgrade of our Cassandra cluster in production, since we are upgrading Cassandra on solaris to Cassandra on CentOS. (We went with solaris initially since most of our other ...
    Arindam BaruaArindam Barua
    Jun 25, 2013 at 6:19 am
    Jun 29, 2013 at 5:16 am
  • Hello, we are using Cassandra as a data storage for our caching system. Our application generates about 20 put and get requests per second. An average size of one cache item is about 500 Kb. Cache ...
    Dmitry OlshanskyDmitry Olshansky
    Jun 25, 2013 at 12:32 pm
    Jun 29, 2013 at 4:50 am
  • We're potentially considering increasing the size of our sstables for some column families from 10MB to something larger. In test, we've been trying to verify that the sstable file sizes change and ...
    Andrew BialeckiAndrew Bialecki
    Jun 21, 2013 at 11:40 pm
    Jun 24, 2013 at 12:03 pm
  • Hi, I've been running a benchmark on Cassandra and I'm facing a problem regarding to the size of the database. I performed a load phase and then, when running nodetool ring, I got the following ...
    Rodrigo FelixRodrigo Felix
    Jun 17, 2013 at 3:34 pm
    Jun 21, 2013 at 12:05 pm
  • Mostly for fun, I wanted to throw this out there... We are undergoing a security audit for our platform (C* + Elastic Search + Storm). One component of that audit is susceptibility to SQL injection ...
    Brian O'NeillBrian O'Neill
    Jun 18, 2013 at 12:02 pm
    Jun 20, 2013 at 6:57 pm
  • I run a 1.1 cluster and currently testing out a 1.2 cluster. I have noticed that with 1.2 it switched to CQL3 which is acting differently than I would expect. When I do "select key from \"cf\";" I ...
    Ekaqu somethingEkaqu something
    Jun 4, 2013 at 4:56 pm
    Jun 5, 2013 at 12:25 pm
  • Hi there, I am writing data to Cassandra by thrift client (not hector) and wonder what happen if the coordinator node fails. The same question applies for bulk loader which uses gossip protocol ...
    Jiaan ZengJiaan Zeng
    Jun 26, 2013 at 12:11 am
    Jun 29, 2013 at 3:11 pm
  • Hi All, I have a question. In the case where replace a cassandra node (call it node A) with another one that has the exact same IP (ie. during a node failure), what exactly should we do? Currently I ...
    Emalayan VairavanathanEmalayan Vairavanathan
    Jun 20, 2013 at 5:40 pm
    Jun 27, 2013 at 8:07 pm
  • I have a loop that reads a counter, increments it by some integer, then goes off and does about 500ms of other work. After about 10 iterations of this loop, the counter value *sometimes* appears to ...
    Josh DzielakJosh Dzielak
    Jun 25, 2013 at 1:42 am
    Jun 25, 2013 at 9:01 pm
  • Looking at the Cassandra 13 keynote [1], slide 56 regarding hinted writes causing the lock to be taken even though the client thinks the lock attempt failed, which the new CAS support fixes. I have ...
    Blair ZajacBlair Zajac
    Jun 22, 2013 at 7:10 pm
    Jun 25, 2013 at 2:38 am
  • Hi - What is the block size for Cassandra ? is it taken from the OS defaults ?
    Kanwar SanghaKanwar Sangha
    Jun 20, 2013 at 7:18 pm
    Jun 21, 2013 at 8:52 am
  • Hello, If I store a video into a column, how can I get a fragment of it without having to download it entirely ? Is there a way to give an offset on a column ? Do I have to fragment it over a lot of ...
    Simon MajouSimon Majou
    Jun 20, 2013 at 8:44 am
    Jun 21, 2013 at 8:15 am
  • Hello, I have been doing some scripted load testing of Cassandra as part of determining what hardware to deploy Cassandra on for the particular load profile our application will generate. I'm seeing ...
    James LeeJames Lee
    Jun 14, 2013 at 2:20 pm
    Jun 14, 2013 at 5:11 pm
  • Hi, We use to work on a single DC (EC2Snitch / SimpleStrategy). For latency reason we had top open a new DC in the US (us-east). We run C* 1.2.2. We don't use VPC. Now we use: - 2 DC (eu-west, ...
    Alain RODRIGUEZAlain RODRIGUEZ
    Jun 5, 2013 at 1:49 pm
    Jun 14, 2013 at 7:20 am
  • Hi Cassandra community, we are currently experimenting with different Cassandra scaling strategies. We observed that Cassandra performance decreases drastically when we insert more data into the ...
    Markus KlemsMarkus Klems
    Jun 13, 2013 at 5:48 pm
    Jun 13, 2013 at 11:07 pm
  • Hi, I hate to be a clod, but I'd really like to unsubscribe from this list. I've tried every permutation I can think of to do it "the right way", and all of the styles in the help message. If there's ...
    Luke HospadarukLuke Hospadaruk
    Jun 10, 2013 at 2:36 pm
    Jun 10, 2013 at 5:14 pm
  • Hi, I was playing around with the datastax driver today, and I wanted to call "DESCRIBE TABLE ....;". But got a syntax error: line 1:0 no viable alternative at input 'describe'. Is that functionality ...
    Joe GreenawaltJoe Greenawalt
    Jun 9, 2013 at 10:50 pm
    Jun 10, 2013 at 11:06 am
  • Hello, We're thinking about using multiple data directories each with its own disk and are currently testing this against a RAID0 config. I've seen that there is failure handling with multiple JBOD ...
    Christopher WirtChristopher Wirt
    Jun 5, 2013 at 9:33 am
    Jun 5, 2013 at 10:01 pm
  • Team, Can anyone share real use cases in Cassandra? Thanks & Regards, Varada Solution Architect/Business Information Management Services Practice Polaris Financial Technology Limited 6th Floor, West ...
    Varadarajan VVaradarajan V
    Jun 19, 2013 at 10:49 am
    Jul 7, 2013 at 3:10 am
  • NREL has released their open source databus. They spin it as energy data (and a system for campus energy/building energy) but it is very general right now and probably will stay pretty general. More ...
    Hiller, DeanHiller, Dean
    Jun 21, 2013 at 2:52 pm
    Jun 27, 2013 at 4:44 am
  • The Cassandra team is pleased to announce the release of Apache Cassandra version 1.2.6. Cassandra is a highly scalable second-generation distributed database, bringing together Dynamo's fully ...
    Sylvain LebresneSylvain Lebresne
    Jun 26, 2013 at 2:53 pm
    Jun 26, 2013 at 5:02 pm
  • Hi All, Is nested select supported by Cassandra JDBC driver? So for a simple example to get a list of user details from a users column family: Select * from user_details where user_id in (Select ...
    Tony AnecitoTony Anecito
    Jun 25, 2013 at 3:03 pm
    Jun 25, 2013 at 4:58 pm
  • Hello everybody, I am trying to perform a rolling upgrade from 1.1.10 to 1.2.4 ( with two patches to 1.2.4 https://issues.apache.org/jira/browse/CASSANDRA-5554 ...
    Ananth GundabattulaAnanth Gundabattula
    Jun 23, 2013 at 3:26 am
    Jun 24, 2013 at 5:47 pm
  • My company is planning on deploying cassandra to three separate datacenters. Each datacenter will have a cassandra cluster with a separate set of seeds specific to that datacenter. However, the ...
    Faraaz SareshwalaFaraaz Sareshwala
    Jun 19, 2013 at 5:51 pm
    Jun 21, 2013 at 7:58 am
  • Hi All, I have a cluster of 5 nodes with C* 1.2.4. Each node has 4 disks 1 TB each. I see a lot of dropped messages after it stores 400 GB per disk. (1.6 TB per node). The recommendation was 500 GB ...
    CemCem
    Jun 18, 2013 at 5:12 pm
    Jun 20, 2013 at 9:53 am
  • I am using cassandra 1.2.6 in cluster with a single node. I am trying to rename the cluster using the instructions in: Cassandra clustername mismatch After doing all the steps indicate I continue ...
    Paco a.k.a. \"Francisco Trujillo\"Paco a.k.a. \"Francisco Trujillo\"
    Jun 18, 2013 at 7:31 am
    Jun 18, 2013 at 5:40 pm
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130 users for June 2013

Aaron Morton: 44 posts Robert Coli: 41 posts Franc Carter: 17 posts Hiller, Dean: 16 posts Sylvain Lebresne: 16 posts Alain RODRIGUEZ: 14 posts Tony Anecito: 14 posts Arthur Zubarev: 13 posts Edward Capriolo: 13 posts Emalayan Vairavanathan: 12 posts Srmore: 12 posts Eric Stevens: 11 posts Shahab Yunus: 11 posts Sankalp kohli: 10 posts Wei Zhu: 10 posts Theo Hultberg: 9 posts Ananth Gundabattula: 8 posts Blair Zajac: 8 posts Joel Samuelsson: 8 posts Takenori Sato(Cloudian): 7 posts
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