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102 discussions - 519 posts

  • *Environment* 1) Actual Cassandra 2.1.3, it was upgraded from 2.1.0 (suggested by Al Tobey from DataStax) 2) not using vnodes 3)Two data centres: 5 nodes in one DC (DC_A), 4 nodes in second DC (DC_B) ...
    Ja SamJa Sam
    Feb 16, 2015 at 4:32 pm
    Feb 24, 2015 at 3:27 pm
  • Hey all, I'm attempting to run Cassandra 2.1.2 on a smallish 2.GB ram instance over at Digital Ocean. It's a CentOS 7 host. But I'm having some difficulty there. Cassandra will start with no problems ...
    Tim DunphyTim Dunphy
    Feb 19, 2015 at 1:11 am
    Feb 23, 2015 at 5:59 pm
  • Hi, I write some question before about my problems with C* cluster. All my environment is described here: https://www.mail-archive.com/user@cassandra.apache.org/msg40982.html To sum up I have ...
    Ja SamJa Sam
    Feb 25, 2015 at 10:20 am
    Feb 26, 2015 at 8:02 pm
  • Is there a simple way (or even a complicated one) how can I speed up SELECT * FROM [table] query? I need to get all rows form one table every day. I split tables, and create one for each day, but ...
    Ja SamJa Sam
    Feb 11, 2015 at 10:28 am
    Feb 16, 2015 at 6:50 pm
  • Hi, Couple of times a day 2 out of 4 members cluster nodes are killed root@db4:~# dmesg | grep -i oom [4811135.792657] [ pid ] uid tgid total_vm rss cpu oom_adj oom_score_adj name [6559049.307293] ...
    Michał ŁowickiMichał Łowicki
    Feb 18, 2015 at 6:28 pm
    Feb 23, 2015 at 10:16 am
  • Hi, I am working on exposing the Cassandra Query APIs(Java Driver) as REST APIs for our internal project. To support Pagination, I looked at the Cassandra documentation, Source code and other ...
    Feb 10, 2015 at 1:00 pm
    Feb 13, 2015 at 6:21 pm
  • Hi all, The guide for installing Cassandra on EC2 says that "Note: The DataStax AMI does not install DataStax Enterprise nodes with virtual nodes enabled." ...
    Clint KellyClint Kelly
    Feb 20, 2015 at 5:10 am
    Feb 23, 2015 at 8:11 pm
  • Hi, I recommissioned a node after decommissioningit. That happened (1) after a successfull decommission (checked), (2) without wiping the data directory on the node, (3) simply by restarting the ...
    Stefano OrtolaniStefano Ortolani
    Feb 11, 2015 at 5:16 am
    Feb 13, 2015 at 3:07 pm
  • Taking the opportunity Spark was being discussed in another thread, I decided to start a new one as I have interest in using Spark + Cassandra in the feature. About 3 years ago, Spark was not an ...
    Marcelo Valle (BLOOMBERG/ LONDON)Marcelo Valle (BLOOMBERG/ LONDON)
    Feb 11, 2015 at 1:25 pm
    Feb 13, 2015 at 5:04 pm
  • Hello, Pre cassandra 1.0, after sstables are compacted, the old sstables will be remain until the first gc kick in. For cassandra 1.0, the sstables will be remove after compaction is done. Will it be ...
    Jason WeeJason Wee
    Feb 13, 2015 at 9:36 am
    Mar 4, 2015 at 7:19 am
  • Hello all, I have a new node that I want to add to the ring. The problem is that nodetool says UJ I have left it for several days and the status has not changed. In Opscenter it is "seen" as in an ...
    Batranut BogdanBatranut Bogdan
    Feb 25, 2015 at 11:41 pm
    Mar 3, 2015 at 3:55 am
  • Hi all, we are seeing quite high GC pressure (in old space by CMS GC Algorithm) on a node with 4TB of data. It runs C* 1.2.18 with 12G of heap memory (2G for new space). The node runs fine for couple ...
    Jiri HorkyJiri Horky
    Feb 8, 2015 at 8:45 pm
    Feb 19, 2015 at 8:04 am
  • Has anyone designed a bi-temporal table in Cassandra? Doesn't look like I can do this using CQL for now. Taking the time series example from well known modeling tutorials in Cassandra - CREATE TABLE ...
    Raj NRaj N
    Feb 14, 2015 at 2:07 am
    Feb 20, 2015 at 10:03 pm
  • Hello all, I have an existing cluster. When adding a new node, I saw that Opscenter saw the node in an unknown cluster. In the yaml, the cluster name is the same. So i have stopped the node and added ...
    Batranut BogdanBatranut Bogdan
    Feb 17, 2015 at 12:58 pm
    Feb 18, 2015 at 1:49 pm
  • Hello to all I have single node cassandra on amazon ec2. Currently i am having a read timeout problem on single CF , single raw. Raw size is aroung 190MB.There are bigger raws with similar structure ...
    Yulian OifaYulian Oifa
    Feb 24, 2015 at 4:07 pm
    Feb 24, 2015 at 7:00 pm
  • Hi guys, I want to take a row with primary key K1, rewrite it with primary key K2, and delete the original data with key K1, atomically. It seems like the only solution which won't have race ...
    Ajaya AgrawalAjaya Agrawal
    Feb 6, 2015 at 2:03 pm
    Feb 8, 2015 at 3:23 pm
  • Hello, I'm having problems getting cassandra to start with the configuration listed above. Yum wants to install 3.2.4-2.el6 of the JNA along with several other packages including java-1.7.0-openjdk ...
    Garret PickGarret Pick
    Feb 25, 2015 at 8:12 pm
    Feb 26, 2015 at 5:17 pm
  • Hi guys: I have a 20 nodes C* cluster with vnodes,version is 2.1.2. When I add a node to my cluster,it take a long time ,and somes exists node nodetool nestats show this: Mode: NORMAL Unbootstrap ...
    Feb 19, 2015 at 12:20 pm
    Feb 20, 2015 at 4:38 pm
  • Can we install Oracle JDK instead of JRE in Cassandra servers? We have few clusters running JDK when we upgraded to C*2.0. Is there any known issue or impact with using JDK vs JRE? What is the reason ...
    Cass savyCass savy
    Feb 18, 2015 at 7:50 pm
    Feb 18, 2015 at 10:38 pm
  • I am getting an out of memory error why I try to start Cassandra on one of my nodes. Cassandra will run for a minute, and then exit without outputting any error in the log file. It is happening while ...
    Paul NickersonPaul Nickerson
    Feb 10, 2015 at 7:03 pm
    Feb 11, 2015 at 12:48 am
  • I may be forced to run Cassandra on top of Ceph. Does anyone have experience / tips with this. Or alternatively, strong reasons why this won't work. cheers Colin
    Colin TaylorColin Taylor
    Feb 1, 2015 at 2:28 am
    Feb 2, 2015 at 4:29 pm
  • We want to track events in log Cf/table and should be able to query for events that occurred in range of mins or hours for given day. Multiple events can occur in a given minute. Listed 2 table ...
    Cass savyCass savy
    Feb 19, 2015 at 12:21 am
    Feb 20, 2015 at 7:20 am
  • Hi, I’m using Cassandra to store NLP data, the dataset is not that huge (about 1TB), but I need to iterate over it quite frequently, updating the full dataset (each record, but not necessarily each ...
    Pavel VelikhovPavel Velikhov
    Feb 11, 2015 at 10:24 am
    Feb 17, 2015 at 8:03 pm
  • Dear Distinguished Colleagues: We'd like to upgrade our cluster from 1.2 to 2.0 and then to 2.1 . We are using Pelops Thrift client, which has long been abandoned by its authors. I've read that 2.x ...
    Oleg DulinOleg Dulin
    Feb 2, 2015 at 1:38 pm
    Feb 2, 2015 at 3:02 pm
  • Hi, I was just reading about cassandra and playing a little with it (using django www.djangoproject.com on the web server). One thing that I realized now is that fulltext search as in a normal sql ...
    Feb 1, 2015 at 4:12 pm
    Feb 2, 2015 at 8:51 am
  • I am on Cassandra 1.2.19 and I am following the documentation for adding existing nodes to a cluster <http://www.datastax.com/docs/1.1/cluster_management#adding-capacity-to-an-existing-cluster . We ...
    Seth EdwardsSeth Edwards
    Feb 10, 2015 at 1:00 am
    Feb 10, 2015 at 6:29 pm
  • Hi Guys, Need help with this. My rowKey is stockName like GOOGLE, APPLE. Columns are sorted as per timestamp and they include some set of data fields like price and size. So, data would be like 1 ...
    Ravi AgrawalRavi Agrawal
    Feb 3, 2015 at 6:28 pm
    Feb 4, 2015 at 4:43 pm
  • Hi,all: I have 18 nodes C* cluster with cassandra2.1.2.Some nodes have aboud 40,000+ sstables. my compaction strategy is STCS. Could someone give me some solution to deal with this situation ...
    Feb 3, 2015 at 2:06 am
    Feb 3, 2015 at 6:23 am
  • Hi guys, Please, does anyone here already mounted a specific keyspace directory to ram memory using tmpfs? Do you see any problem doing so, except by the fact that the data can be lost? Thanks in ...
    Gabriel MenegattiGabriel Menegatti
    Feb 1, 2015 at 8:32 pm
    Feb 2, 2015 at 12:33 pm
  • Hi all, We have a table in Cassandra where we frequently overwrite recent inserts. Compaction does a fine job with this but ultimately larger memtables would reduce compactions. The question is: can ...
    Dan KinderDan Kinder
    Feb 27, 2015 at 10:02 pm
    Mar 2, 2015 at 9:28 pm
  • I want to make unique constraint in cassandra . As i want that all the value in my column be unique in my column family ex: name-rahul phone-123 address-abc now i want that in this row no values ...
    Feb 27, 2015 at 11:57 am
    Mar 2, 2015 at 11:46 am
  • I want to make unique constraint in Cassandra . As i want that all the value in my column be unique in my column family example : name-rahul ,phone-123, address-abc now i want that in this row no ...
    Feb 28, 2015 at 4:29 am
    Feb 28, 2015 at 4:13 pm
  • Hi all, My team is using Cassandra as our database. We have one question as below. As we know, the row with the some partition key will be stored in the some node. But how many rows can one partition ...
    Feb 27, 2015 at 6:46 am
    Feb 27, 2015 at 12:41 pm
  • Our Cassandra database just rolled to live last night. I’m looking at our query performance, and overall it is very good, but perhaps 1 in 10,000 queries takes several hundred milliseconds (up to a ...
    Robert WilleRobert Wille
    Feb 25, 2015 at 3:33 pm
    Feb 26, 2015 at 9:53 am
  • Unsubscribe What is it going to take to get my address off this list? You're instructions are not working for me.
    Steve RyderSteve Ryder
    Feb 19, 2015 at 8:08 pm
    Feb 22, 2015 at 9:18 am
  • Hi guys: I have a 20 nodes C* cluster with vnodes,version is 2.1.2. when after compaction some nodes has some tmp files (like this: weibo-content1-tmp-ka-95117-Data.db),there can't remove after GC. I ...
    Feb 19, 2015 at 12:17 pm
    Feb 19, 2015 at 12:58 pm
  • Hi, Is there a public road map for Cassandra 3.0? Are there any estimates for the release date of 3.0? -- Regards - Ernesto Reinaldo Barreiro
    Ernesto Reinaldo BarreiroErnesto Reinaldo Barreiro
    Feb 11, 2015 at 12:26 pm
    Feb 17, 2015 at 2:38 pm
  • Hello, I have added new nodes to the existing cluster. In Opscenter I do not see any streams... I presume that the new nodes get the data from the rest of the cluster via streams. The existing ...
    Batranut BogdanBatranut Bogdan
    Feb 12, 2015 at 11:21 am
    Feb 13, 2015 at 6:17 pm
  • Hi, We have a two-dc cluster with 21 nodes and 27 nodes in each DC. Over the past few months, we have seen nodetool status marks 4-8 nodes down while they are actually functioning. Particularly today ...
    Cheng RenCheng Ren
    Feb 10, 2015 at 2:42 am
    Feb 10, 2015 at 10:56 pm
  • Good morning, unfortunately my last rolling restart of our Cassandra cluster issued from OpsCenter (5.0.2) failed. No big deal, but since then OpsCenter is showing an error message at the top of its ...
    Björn HachmannBjörn Hachmann
    Feb 9, 2015 at 9:04 am
    Feb 10, 2015 at 1:43 pm
  • Hi, we are currently writing the same column within a row multiple times (up to 10 times a second). I am familiar with the concept of tombstones in SSTables. My question is: I assume that in our case ...
    Andreas FinkeAndreas Finke
    Feb 6, 2015 at 12:17 am
    Feb 6, 2015 at 9:37 am
  • Hi, I am getting below error: Not able to understand why ?? [csduser@master bin]$ ./cassandra -f CompilerOracle: inline org/apache/cassandra/db/AbstractNativeCell.compareTo ...
    Krish DonaldKrish Donald
    Feb 4, 2015 at 10:25 pm
    Feb 5, 2015 at 9:31 pm
  • Hello everyone, I am thinking about the architecture of my application using Cassandra and I am asking myself if I should or shouldn't normalize an entity. I have users and alerts in my application ...
    Marcelo Valle (BLOOMBERG/ LONDON)Marcelo Valle (BLOOMBERG/ LONDON)
    Feb 4, 2015 at 3:51 pm
    Feb 4, 2015 at 6:25 pm
  • Hello, I am designing a model to store alerts users receive over time. I will want to store probably the last two years of alerts for each user. The first thought I had was having a column family ...
    Marcelo Elias Del ValleMarcelo Elias Del Valle
    Feb 4, 2015 at 10:37 am
    Feb 4, 2015 at 3:59 pm
  • HI All We are working on a application logging project and this is one of the search tables as below : CREATE TABLE logentries ( logentrytimestamputcguid timeuuid PRIMARY KEY, context text, ...
    Feb 2, 2015 at 3:33 pm
    Feb 2, 2015 at 4:40 pm
  • Hi, I am new to Cassandra and trying to setup a Cassandra 2.0 cluster using 4 nodes, 2 each in 2 different racks. All are in same data centre. This is what I see in the documentation: To use racks ...
    Amlan RoyAmlan Roy
    Feb 27, 2015 at 3:35 pm
    Feb 28, 2015 at 1:33 pm
  • Hi, I have three node cluster with RF=1 (only one Datacenter) with following size: Datacenter: DC1 =============== Status=Up/Down -- Address Load Tokens Owns Host ID Rack UN <IP1 4.02 GB 1 33.3% <ID1 ...
    Jaydeep ChovatiaJaydeep Chovatia
    Feb 23, 2015 at 11:43 pm
    Feb 24, 2015 at 1:27 am
  • Hi all, I read the DSE 4.6 documentation and I'm still not 100% sure what a mixed workload Cassandra + Spark installation would look like, especially on AWS. What I gather is that you use OpsCenter ...
    Clint KellyClint Kelly
    Feb 20, 2015 at 9:19 pm
    Feb 23, 2015 at 1:00 pm
  • Greetings, I have one column family with 10 columns, one of the column we store xml/json. Is there a way I can query that column where size 50kb ? assuming I have index on that column. thanks CV.
    chandra Varahalachandra Varahala
    Feb 13, 2015 at 4:10 am
    Feb 13, 2015 at 5:24 pm
  • What’s the fastest way to map/parallel read all values in a table? Kind of like a mini map only job. I’m doing this to compute stats across our entire corpus. What I did to begin with was use token() ...
    Kevin BurtonKevin Burton
    Feb 8, 2015 at 8:51 pm
    Feb 9, 2015 at 7:40 pm
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146 users for February 2015

Robert Coli: 28 posts Marcelo Valle (BLOOMBERG/ LONDON): 26 posts Ja Sam: 25 posts Carlos Rolo: 23 posts Eric Stevens: 22 posts Batranut Bogdan: 16 posts Mark Reddy: 14 posts Clint Kelly: 12 posts Roni Balthazar: 11 posts 曹志富: 11 posts Tim Dunphy: 10 posts Asit KAUSHIK: 9 posts Jack Krupansky: 9 posts Ajay: 8 posts Colin Clark: 8 posts Jiri Horky: 8 posts Michał Łowicki: 8 posts Chris Lohfink: 7 posts Roland Etzenhammer: 7 posts Cass savy: 6 posts
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