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78 discussions - 300 posts

  • I am getting this error repeatedly while I am trying to add a new DC consisting of one node in AWS to my existing cluster. I have tried 5 times already. Running Cassandra 2.1.13 I have also set ...
    George SigletosGeorge Sigletos
    May 25, 2016 at 6:31 am
    Jun 2, 2016 at 12:37 pm
  • I am running 3.0.5 with 2 nodes in two DCs, gce-us-central1 and gce-us-east1. I increased the replication factor of gce-us-central1 from 1 to 2. Then I ran 'nodetool repair -dc gce-us-central1'. The ...
    Luke JollyLuke Jolly
    May 23, 2016 at 7:31 pm
    May 25, 2016 at 7:56 pm
  • Hi, we have a table with a Map Field. We do not delete anything in this table, but to updates on the values including the Map Field (most of the time a new value for an existing key, Rarely adding ...
    Matthias NiehoffMatthias Niehoff
    May 25, 2016 at 2:57 pm
    Jun 2, 2016 at 1:32 pm
  • Hi there, i am sometimes running in very strange errors while backing up snapshots from a cassandra cluster. Cassandra version: 2.1.11 What i basically do: 1. nodetool snapshot 2. tar all snapshot ...
    Paul DunklerPaul Dunkler
    May 31, 2016 at 9:03 am
    Jun 1, 2016 at 1:07 pm
  • Hi, What is the impact of setting bloom_filter_fp_chance < 0.01. During performance tuning I was trying to tune bloom_filter_fp_chance and have following questions: 1). Why bloom_filter_fp_chance = 0 ...
    Adarsh KumarAdarsh Kumar
    May 18, 2016 at 6:22 am
    May 30, 2016 at 9:05 am
  • dHi, All, We are considering to use DataStax java driver in our codes. One important feature provided by the driver we want to use is 'paging'. But according to the ...
    Lu, BoyingLu, Boying
    May 9, 2016 at 10:26 am
    May 10, 2016 at 4:31 pm
  • Hi, We have a 3 node cluster in DC1, where replication factor of keyspace is 3. How can i read data only from one particular node in java driver? Thanks, Siddharth Verma
    Siddharth VermaSiddharth Verma
    May 5, 2016 at 7:55 am
    May 6, 2016 at 4:51 pm
  • Hi, Has anyone tried accessing Cassandra data using SparkShell? How do you do it? Can you use HiveContext for Cassandra data? I'm using community version of Cassandra-3.0 Thanks, LCassa
    Cassa LCassa L
    May 10, 2016 at 4:08 am
    May 19, 2016 at 5:30 am
  • Hi guys We are thinking of using one the 3 big data platforms i.e hortonworks , mapr or cloudera . Will use hadoop ,hive , zookeeper, and spark in these platforms. Which platform would be better ...
    Srini SydneySrini Sydney
    May 10, 2016 at 12:21 am
    May 17, 2016 at 6:54 am
  • Hi, What’s the difference between the two “Community” repositories Apache (http://www.apache.org/dist/cassandra/debian) and DataStax (http://debian.datastax.com/community/)? If they are just mirrors, ...
    Drew KutcharianDrew Kutcharian
    May 16, 2016 at 10:20 pm
    May 18, 2016 at 2:05 pm
  • Hi, I have 2 queries. We are using cassandra dsc 3.0.3 and stratio lucene indexes on tables. 1. when table is truncated, lucene index is not cleared for the same. we see that it still occupied space ...
    Siddharth VermaSiddharth Verma
    May 6, 2016 at 7:43 am
    May 17, 2016 at 6:17 pm
  • Hi, I am doing some testing on CAS operations and I am frequently having the issue that my resultset says wasApplied()==false, but it does not contain any value. This behaviour of course leads to the ...
    May 4, 2016 at 3:47 pm
    May 9, 2016 at 2:30 pm
  • Hi all, tl:dr The Titan 0.5.4 cassandrathrift client + C* 2.0.8/2.2.6 create massive amounts of network packets for multiget_slice queries. Is there a way to avoid the “packet storm”? Details... We ...
    Ralf SteppacherRalf Steppacher
    May 20, 2016 at 1:44 pm
    May 27, 2016 at 6:49 am
  • Hi experts, We are evaluating Cassandra as messaging infrastructure for a project. In our workflow Cassandra database will be synchronized across two nodes, a component will INSERT/UPDATE records on ...
    Aaditya VadnereAaditya Vadnere
    May 24, 2016 at 3:49 pm
    May 26, 2016 at 4:43 pm
  • I'd like to get feedback/opinions on a possible work around for a timestamp + data consistency edge case issue. Context for this question: When using client timestamp (default timestamp), on C* that ...
    Jen SmithJen Smith
    May 12, 2016 at 5:32 pm
    May 15, 2016 at 2:15 pm
  • Hello, In what scenarios can SS Table files on disk from Node 1 go to Node 2 as is ? I'm aware this happens in nodetool rebuild and I am assuming this does not happen in repairs. Can someone confirm ...
    Anubhav KaleAnubhav Kale
    May 6, 2016 at 8:16 pm
    May 9, 2016 at 6:01 pm
  • Hi All, I downloaded the latest cassandra driver but when used I get an error about class io.netty.util.timer (netty-3.9.0.Final) not being found during runtime. If I get the latest ...
    Tony AnecitoTony Anecito
    May 26, 2016 at 2:26 am
    May 26, 2016 at 9:37 pm
  • hi, I am creating a trigger in cassandra ----------------------------------------------------------------------------------------------------------------------- public class GenericAuditTrigger ...
    Siddharth VermaSiddharth Verma
    May 26, 2016 at 6:34 am
    May 26, 2016 at 4:12 pm
  • Hi, I got a Cassandra keyspace, but while reading the data(especially UUID) via Spark SQL using Python is not returning the correct value. Cassandra: -------------- My table 'SAM'' is described ...
    Rajesh RadhakrishnanRajesh Radhakrishnan
    May 24, 2016 at 10:23 am
    May 25, 2016 at 10:28 am
  • Hi, i try to export data of a table (~15GB) using the cqlsh copy to. It fails with „no host available“. If I try it with a smaller table everything works fine. The statistics of the big table ...
    Matthias NiehoffMatthias Niehoff
    May 10, 2016 at 8:29 am
    May 11, 2016 at 1:02 am
  • I decommissioned a seed node from the cluster but now it still shows up in the log files but does not show up in "nodetool status". The steps I took to decommission this seed node was first I added ...
    Zhang, CharlesZhang, Charles
    May 3, 2016 at 5:09 pm
    May 3, 2016 at 6:46 pm
  • Forgive me if that has been answered somewhere, but I could not find a concise or clear answer. I am using Cassandra 2.0.6 on a 3 node cluster. I don't usually run manual compaction, and relied ...
    Dongfeng LuDongfeng Lu
    May 16, 2016 at 11:06 pm
    Jun 2, 2016 at 9:53 am
  • Hi, We are running a 6 Node cluster in 2 DC on DSC 3.0.3, with 3 Node each. One of the node was showing UNREACHABLE on other nodes in nodetool describecluster and on that node it was showing all ...
    Bhuvan RawalBhuvan Rawal
    May 29, 2016 at 10:18 am
    May 30, 2016 at 12:17 pm
  • Hi, we are running a cluster of 4 nodes, each one has the same sizing: 2 cores, 16G ram and 1TB of disk space. On every node we are running cassandra 2.0.17, oracle java version "1.7.0_45", centos 6 ...
    Paolo CrosatoPaolo Crosato
    May 26, 2016 at 4:39 pm
    May 27, 2016 at 1:27 pm
  • We are exploring cassandra's limit by creating a lot of keyspaces with moderate number of column families (roughly 40 - 50) per keyspace and we have a problem after we reach certain amount of ...
    Justin LinJustin Lin
    May 24, 2016 at 5:04 pm
    May 26, 2016 at 4:46 pm
  • Hello, Suppose we have 2 DCs and we know that the data is correctly replicated in both. In such situation, is it safe to "remove" one of the DCs by simply doing a "nodetool remove node" followed by ...
    Anubhav KaleAnubhav Kale
    May 23, 2016 at 11:41 pm
    May 24, 2016 at 4:44 pm
  • I have concern over using secondary index on field with low cardinality. Lets say I have few billion rows and each row can be classified in 1000 category. Lets say we have 50 node cluster. Now we ...
    Atul SarohaAtul Saroha
    May 10, 2016 at 11:41 am
    May 18, 2016 at 12:52 pm
  • Hi, I have a table on 3-node cluster. I notice bloom filter memory usage are very different on one of the node. For a given table, I checked ...
    Kai WangKai Wang
    May 3, 2016 at 4:47 pm
    May 18, 2016 at 3:19 am
  • Hi, Which DataStax Java Driver release is most stable (production ready) for Cassandra 2.1? ThanksAnuj
    Anuj WadehraAnuj Wadehra
    May 8, 2016 at 2:39 pm
    May 8, 2016 at 5:10 pm
  • Hi, Please let me know how to interpret the below output from cfstats, especially the entry in bold. SSTable count: 947 SSTables in each level: [1, 10, *104/100*, 832, 0, 0, 0, 0, 0] We are using C* ...
    Joseph TechJoseph Tech
    May 6, 2016 at 1:15 pm
    May 6, 2016 at 6:22 pm
  • Hi All, I have question regarding max disk space limit on a node. As per Data stax, We can have 1TB max disk space for rotational disks and up to 5 TB for SSDs on a node. Could you please suggest per ...
    Anshu VajpayeeAnshu Vajpayee
    May 27, 2016 at 7:52 pm
    May 31, 2016 at 7:42 pm
  • We are using Cassandra for our social network and we are designing/data modeling tables we need, it is confusing for us and we don't know how to design some tables and we have some little problems! ...
    Mohammad KermaniMohammad Kermani
    May 30, 2016 at 11:41 am
    May 31, 2016 at 2:32 pm
  • Hi, I'm running a 3 nodes Cassandra 2.1.x cluster. Each node has 8vCPU and 30 Go RAM. Replication factor = 3 for my keyspace. Recently, i'm using the Java Driver (within Storm) to read / write data ...
    Bastien dineBastien dine
    May 25, 2016 at 4:00 pm
    May 26, 2016 at 6:52 am
  • Hello, I am trying to load the SSTables (from a Titan graph keyspace) of a one-node-cluster (C* v2.2.6) into another node, but I cannot figure out how to properly use the sstableloader. The target ...
    Ralf SteppacherRalf Steppacher
    May 23, 2016 at 1:48 pm
    May 24, 2016 at 6:12 am
  • Hi Cassandra users, Is there a way to find if auto_bootstrap is set to false on a Cassandra node if we didn't know the location of the cassandra.yaml or the cassandra installation directory (for ...
    Rajath SubramanyamRajath Subramanyam
    May 23, 2016 at 10:44 pm
    May 23, 2016 at 11:06 pm
  • Hi! I have a 2.0.13 cluster which I have just extended, and I'm now looking into upgrading it to 2.1. * The cleanup after the extension is partially done. * I'm also looking into changing a few ...
    Erik ForsbergErik Forsberg
    May 23, 2016 at 7:52 am
    May 23, 2016 at 10:23 am
  • - Cassandra 2.1.13 - SSDs - LeveledCompactionStrategy - Range repair (not incremental) with Spotify's Reaper https://github.com/spotify/cassandra-reaper Problem : When we run a repair job sometimes ...
    Jean-Francois GosselinJean-Francois Gosselin
    May 6, 2016 at 4:06 pm
    May 20, 2016 at 5:14 pm
  • When executing bulk CAS queries, I intermittently get the following error: SERIAL is not supported as conditional update commit consistency. Use ANY if you mean "make sure it is accepted but I don't ...
    Robert WilleRobert Wille
    May 19, 2016 at 5:12 am
    May 19, 2016 at 3:14 pm
  • How can we determine/measure the replication lag or latency between on premise data centers or cross region/Availability zones?
    Cass savyCass savy
    May 19, 2016 at 3:03 am
    May 19, 2016 at 1:06 pm
  • Hi all, I would like to know, is there any way to rebuild a particular column family when all the SSTables files for this column family are missing?? Say we do not have any backup of it. Thank you ...
    Mike YeapMike Yeap
    May 19, 2016 at 7:56 am
    May 19, 2016 at 8:33 am
  • Hi! I have a 2.0.13 cluster which I need to do two things with: * Extend it * Upgrade to 2.1.14 I'm pondering in what order to do things. Is it a supported operation to extend a partially upgraded ...
    Erik ForsbergErik Forsberg
    May 18, 2016 at 6:17 pm
    May 18, 2016 at 6:37 pm
  • Hi everyone, i'm wondering if it is possible to restore all the snapshots of a cluster (10 nodes) in a smaller cluster (3 nodes)? If yes how to do it? -- Luigi --- “The only way to get smarter is by ...
    Luigi TagliamonteLuigi Tagliamonte
    May 18, 2016 at 12:35 am
    May 18, 2016 at 12:59 am
  • Hello, Is there any good reason why system_auth strategy is SimpleStrategy by default instead of LocalStrategy like system and system_schema ? Especially when documentation advice to set the ...
    Jérôme MainaudJérôme Mainaud
    May 13, 2016 at 9:47 am
    May 17, 2016 at 8:43 am
  • Hi, If i have inconsistent data on nodes Scenario : I have 2 DCs each with 3 nodes and I have inconsistent data on them node 1,2,3,4,5 have P1,100,A,val1,w1 P1,100,B,val2,w2 node 6 has ...
    Siddharth VermaSiddharth Verma
    May 12, 2016 at 11:17 am
    May 12, 2016 at 4:44 pm
  • Hi, all, Haven't heard any responses so far, and this isue has troubled us for quite some time. Here is another update: We have noticed several times that The schema version may change after ...
    Michael FongMichael Fong
    May 9, 2016 at 3:48 am
    May 12, 2016 at 8:18 am
  • Hi, we are running a 9 node cluster under load. The nodes are running in EC2 on i2.2xlarge instances. Cassandra version is 2.2.4. One node was down yesterday for more than 3 hours. So we manually ...
    Reik SchatzReik Schatz
    May 6, 2016 at 7:47 am
    May 6, 2016 at 7:44 pm
  • Hi all, Is it possible to execute queries towards an embedded cassandra db whyle bypassing completely the TCP (or IPC) protocol stack? Apparantly the embedded cassandra is by default accessed using ...
    Corry OpdenakkerCorry Opdenakker
    May 2, 2016 at 4:04 pm
    May 4, 2016 at 6:44 pm
  • Hi, We are using C* 2.0.x . What options are available if disk space is too full to do compaction on huge sstables formed by STCS (created around long ago but not getting compacted due to ...
    Anuj WadehraAnuj Wadehra
    May 28, 2016 at 7:25 pm
    Jun 1, 2016 at 12:30 pm
  • Hi everyone I am currently working with Cassandra 3.5. I would like to know if it is possible to restore backups without using sstableloader. I have been referring to the following pages in the ...
    Ravi Teja A VRavi Teja A V
    May 17, 2016 at 10:14 am
    Jun 1, 2016 at 11:07 am
  • I am running C* 2.1.4 on an Ubuntu vagrant VM. When I use OpenJDK 8, C* works fine. However using Oracle JDK 8, I get the errors listed below. I have read that it is not recommended to use Open JDK ...
    Drew DavisDrew Davis
    May 27, 2016 at 9:30 pm
    May 31, 2016 at 2:42 pm
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104 users for May 2016

George Sigletos: 12 posts Jeff Jirsa: 11 posts Siddharth Verma: 11 posts Paulo Motta: 9 posts Anubhav Kale: 8 posts Bhuvan Rawal: 8 posts Eric Evans: 8 posts Eric Stevens: 8 posts Alain RODRIGUEZ: 7 posts Mike Yeap: 7 posts Ben Slater: 6 posts Joseph Tech: 6 posts Matthias Niehoff: 6 posts Ralf Steppacher: 6 posts Drew Kutcharian: 5 posts Horschi: 5 posts Luke Jolly: 5 posts Tyler Hobbs: 5 posts Adarsh Kumar: 4 posts DuyHai Doan: 4 posts
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