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10,886 discussions - 51,961 posts

  • Hi, I downloaded Cassandra 3.6/3.7 and on my OSX machine having Java 1.8.0_45, I can't launch whenever I try to launch it using "bin/cassandra -f" it gives me error "Error: Could not find or load ...
    Jun 18, 2016 at 1:31 am
    Jun 18, 2016 at 9:30 am
  • Hello! Recently I have been trying to familiarize myself with Cassandra but don't quite understand when data is removed from disk after it has been deleted. The use case I'm particularly interested ...
    Jun 17, 2016 at 6:52 pm
    Jun 17, 2016 at 8:47 pm
  • Hi Guys, We have a 2 DC cluster where the keyspaces are replicated between the 2. Is it possible to add a keyspace to one of the DCs that won't be replicated to the other? Whenever we add a new ...
    Jason J. W. WilliamsJason J. W. Williams
    Jun 17, 2016 at 1:48 am
    Jun 17, 2016 at 2:09 am
  • Hi , I'm from relational world recently started working on Cassandra. I'm just wondering what is backup best practices for DB around 100 Tb with multi DC setup. Thanks, Vasu
    Vasu NosqlVasu Nosql
    Jun 16, 2016 at 10:33 pm
    Jun 16, 2016 at 11:41 pm
  • Hello, I noticed that StreamCoordinator.ConnectionsPerHost is always set to 1 (Cassandra 2.1.13). If I am reading the code correctly, this means there will always be just one socket (well, 2 ...
    Anubhav KaleAnubhav Kale
    Jun 16, 2016 at 5:44 pm
    Jun 17, 2016 at 5:35 pm
  • I'm interested in hearing how you may be using Cassandra to capture user analytics and some design choices you've made. At a high level, I'm considering the following: web application - kafka - ...
    Richard L. Burton IIIRichard L. Burton III
    Jun 15, 2016 at 7:32 pm
    Jun 15, 2016 at 7:32 pm
  • Hi, The cassandra-stress is not helping really to populate the disk sufficiently. I tried several table structures, providing cluster: UNIFORM(1..10000000000) on clustering parts of the PK. Partition ...
    Peter KovganPeter Kovgan
    Jun 15, 2016 at 12:25 pm
    Jun 17, 2016 at 7:22 am
  • Couple of Cqlsh questions: 1) Why when I run the DESCRIBE CLUSTER command no snitch information is required? Is this because my Cassandra cluster is a single node? 2) When I run the HELP ...
    Steve AndersonSteve Anderson
    Jun 15, 2016 at 11:28 am
    Jun 15, 2016 at 1:18 pm
  • Hi all, Can anyone tell me that what are all possible reasons for below log:- *"INFO [ScheduledTasks:1] 2016-06-14 06:27:39,498 MessagingService.java:929 - _TRACE messages were dropped in last 5000 ...
    Varun BaralaVarun Barala
    Jun 15, 2016 at 9:23 am
    Jun 17, 2016 at 3:57 am
  • Hi, I use Erlang driver to send data to Cassandra, do testing at local environment meet data lost issue. I have no idea what step is wrong. *Environment:* 1. Ubuntu 12.04 LTS x64bit 2. Cassandra 3.5 ...
    Linbo liaoLinbo liao
    Jun 15, 2016 at 2:55 am
    Jun 15, 2016 at 1:14 pm
  • What are the options for a very small and nimble startup to do keep a cassandra cluster running well oiled. We are on AWS. We are interested in a monitoring tool and potentially also cluster ...
    Arun RamakrishnanArun Ramakrishnan
    Jun 14, 2016 at 7:10 pm
    Jun 15, 2016 at 1:33 pm
  • The Cassandra team is pleased to announce the release of Apache Cassandra version 3.0.7. Apache Cassandra is a fully distributed database. It is the right choice when you need scalability and high ...
    Jake LucianiJake Luciani
    Jun 14, 2016 at 2:15 pm
    Jun 14, 2016 at 2:15 pm
  • The Cassandra team is pleased to announce the release of Apache Cassandra version 3.7. Apache Cassandra is a fully distributed database. It is the right choice when you need scalability and high ...
    Jake LucianiJake Luciani
    Jun 14, 2016 at 2:15 pm
    Jun 14, 2016 at 2:15 pm
  • Hi, I'm using spark 1.5.1 version. I am reading data from Kafka into Spark and writing it into Cassandra after processing it. Spark job starts fine and runs all good for some time until I start ...
    Cassa LCassa L
    Jun 13, 2016 at 9:56 pm
    Jun 16, 2016 at 9:25 pm
  • Hi there, I've deployed 6 node in Amazon EC2. I'm trying to monitor some metrics for each node and print them out when I write/read data into Cassandra. Specifically I want to print out the ...
    Jun WuJun Wu
    Jun 13, 2016 at 9:18 pm
    Jun 14, 2016 at 7:25 pm
  • I have a small, 3 machine, cluster with 3.2.1 Can I upgrade them to 3.6 from 3.2? Or is it advisable to upgrade to each intermediary version? Based on what I have gather seems like it is matter of ...
    Francisco ReyesFrancisco Reyes
    Jun 13, 2016 at 4:59 pm
    Jun 14, 2016 at 4:22 pm
  • Hi All Why we dont have native shutdown command in Cassandra ? Every software provides graceful shutdown command. ​Regards, Anshu​
    Anshu VajpayeeAnshu Vajpayee
    Jun 13, 2016 at 4:28 pm
    Jun 13, 2016 at 7:28 pm
  • I am trying out Cassandra and have installed it on a single Amazon Linux AMI instance (. I downloaded the Cassandra 3.6 tarball. However when I run Cassandra I notice there are the following ...
    Steve AndersonSteve Anderson
    Jun 13, 2016 at 4:16 pm
    Jun 14, 2016 at 5:37 pm
  • Hi, We are facing this issue on production, We upgraded our cassandra from 3.0.3 to 3.5 When we ran a query with partition key and clustering column(entire primary key specified), we get 16 rows in ...
    Siddharth VermaSiddharth Verma
    Jun 13, 2016 at 12:39 pm
    Jun 15, 2016 at 4:17 am
  • Hello, We've tested adding a new DC from an existing DC having 3 nodes and RF=3 (ie all nodes have all data). During the rebuild process, only one node of the first DC streamed data to the 3 nodes of ...
    Fabien RousseauFabien Rousseau
    Jun 13, 2016 at 9:02 am
    Jun 16, 2016 at 9:19 am
  • I have been trying to obtain json dump of batches table using sstabledump but I get this exception: $ sstabledump /sstable/data/system/batches-919a4bc57a333573b03e13fc3f68b465/ma-277-big-Data.db ...
    Bhuvan RawalBhuvan Rawal
    Jun 11, 2016 at 8:00 pm
    Jun 11, 2016 at 8:58 pm
  • Hi, I've been googling various parts of this all day but none of the suggestions seem to fit. I have 2 nodes, one of which is a seed. I'm trying to add a third node but, after a few minutes in the UJ ...
    Tobin LandricombeTobin Landricombe
    Jun 10, 2016 at 3:11 pm
    Jun 13, 2016 at 5:58 pm
  • Hi, I am facing an issue when taking snapshots. The details of the setup are as follows 1. Cassandra Version 3.5 2. I have a keyspace named *other_map* with '*NetworkTopologyStrategy*' and ...
    Mradul MaheshwariMradul Maheshwari
    Jun 10, 2016 at 4:17 am
    Jun 10, 2016 at 4:41 am
  • We have a use case where we are storing event data for a given system and only want to retain the last N values. Storing extra values for some time, as long as it isn’t too long, is fine but never ...
    John ThomasJohn Thomas
    Jun 8, 2016 at 7:03 pm
    Jun 10, 2016 at 2:54 pm
  • I am running a 3 node cluster of 3.0.6 instances and encountered an error when running nodetool compact. I then ran nodetool repair. No errors were returned. I then attempted to run nodetool compact ...
    Jason KaniaJason Kania
    Jun 8, 2016 at 1:34 am
    Jun 8, 2016 at 5:12 pm
  • Has anyone seen this issue since upgrading to 3.6? I don't have a good idea what is going on yet, as my logs have just been spewing the following error. WARN [SharedPool-Worker-174] 2016-06-07 ...
    Nimi Wariboko JrNimi Wariboko Jr
    Jun 7, 2016 at 11:58 pm
    Jun 8, 2016 at 12:31 am
  • Hello, I have a question. I have changed the Cassandra driver (3.0.0) so we can connect to and query two nodes (Cassandra 3.2.1), the local one and a remote node, using the driver's native protocol ...
    Carolina Simoes GomesCarolina Simoes Gomes
    Jun 7, 2016 at 11:33 pm
    Jun 7, 2016 at 11:33 pm
  • Hi, I have a cluster spreaded among 2 datacenters (DC1 and DC2), two server on each DC and I have a keyspace with NetworkTopologyStrategy (DC1:2 and DC2:2) with the following table: CREATE TABLE test ...
    Jeronimo de A. BarrosJeronimo de A. Barros
    Jun 7, 2016 at 5:26 pm
    Jun 8, 2016 at 4:46 pm
  • Hi guys, I have a Cassandra 2.1.8 Community cluster running with AllowAllAuthorizer and have to change it, so I can implement permissions in different users. As I've checked in the docs, seems like a ...
    Felipe EstevesFelipe Esteves
    Jun 7, 2016 at 4:06 pm
    Jun 8, 2016 at 6:21 pm
  • Hi, all, I am attempting write a trigger that depends on a native library. The library is successfully loaded by the JVM (so the java.library.path should not be the issue - I just have the jnilib in ...
    Brian KellyBrian Kelly
    Jun 7, 2016 at 3:07 pm
    Jun 8, 2016 at 5:51 pm
  • Hi, All, Since the Astyanax client has been EOL, we are considering to migrate to Datastax java client in our product. One thing I notice is that the CFs created by Astyanax have 'compact storage' ...
    Lu, BoyingLu, Boying
    Jun 7, 2016 at 8:51 am
    Jun 12, 2016 at 8:05 am
  • Hi, We recently discovered that there are some differences in gossip behavior between C* 2.0 and C* 2.1. In some cases of network instability or a node reboot, we can observe some behavioral ...
    Michael FongMichael Fong
    Jun 7, 2016 at 2:58 am
    Jun 7, 2016 at 2:58 am
  • The Cassandra team is pleased to announce the release of Apache Cassandra version 3.6. Apache Cassandra is a fully distributed database. It is the right choice when you need scalability and high ...
    Jake LucianiJake Luciani
    Jun 6, 2016 at 8:21 pm
    Jun 6, 2016 at 8:21 pm
  • Hello C*-users community, I have a question about Cassandra data files corruption. In one of our test clusters (which runs *C* 2.1*), we observed that when we run the tool *'sstablemetada'* on one of ...
    Rajath SubramanyamRajath Subramanyam
    Jun 6, 2016 at 8:06 pm
    Jun 6, 2016 at 8:06 pm
  • I'm creating a cassandra cluster. I've three node with centos 7 and cassandra 3.4 installed. Node0 interfaces: eth0 169.254.169.xx1 (Public IP) eth1 IP) Node1 interfaces: eth0 ...
    Sahriar rahman suptoSahriar rahman supto
    Jun 6, 2016 at 7:27 am
    Jun 6, 2016 at 7:27 am
  • Hi All, I am around with a use case to extract/fetch the Cassandra specific Insert/update events, had been through a project on github( https://github.com/carloscm/cassandra-commitlog-extract) but I ...
    Vineet MishraVineet Mishra
    Jun 5, 2016 at 4:34 pm
    Jun 7, 2016 at 3:35 pm
  • Hi List, I am from ScyllaDB and took some time to iterate on the wireshark CQL dissector that was previously written by Aaron Ten Clay. The result is that wireshark upstream now have a fully working ...
    Benoît CanetBenoît Canet
    Jun 5, 2016 at 10:46 am
    Jun 7, 2016 at 3:49 am
  • I just upgrade C* from 2.2.4 to 2.2.6. I ran "nodetool upgradesstables" and it returned within a few seconds. Does this sound right? A few questions: 1. is it possible that sstable formats are the ...
    Kai WangKai Wang
    Jun 4, 2016 at 4:36 pm
    Jun 4, 2016 at 9:51 pm
  • Hello, I am using Cassandra 3.2.1 and the 3.0.0 driver. I need to build the driver but with all its dependencies included in the jar (uber jar), using maven, such that there are no external ...
    Carolina Simoes GomesCarolina Simoes Gomes
    Jun 4, 2016 at 1:08 am
    Jun 4, 2016 at 1:09 am
  • Fellow Cassandra Users, We have been using a library we call "Hecate" to do Cassandra ORM-type mapping for our clients for quite some time with tremendous success. We have recently released a ...
    James CarmanJames Carman
    Jun 3, 2016 at 4:22 pm
    Jun 3, 2016 at 4:22 pm
  • Hi Everyone, We have a unique situation at my workplace while storing data. We are using Cassandra as a write through cache where we keep real time data in Cassandra for around 10 - 20 days and rest ...
    Abhinav SolanAbhinav Solan
    Jun 3, 2016 at 3:43 pm
    Jun 3, 2016 at 9:55 pm
  • Hi, While running incremental (parallel) repairs on the first partition range (-pr), I rarely see the progress percentage going over 20%/25%. 2016-06-02 14:12:23,207] Repair session ...
    Stefano OrtolaniStefano Ortolani
    Jun 2, 2016 at 2:55 pm
    Jun 2, 2016 at 3:38 pm
  • Hi, I've got a 6 node C* cluster (all nodes are equal both in OS and HW setup, they are DL380 Gen9 with Smart Array RAID 50,3 on SAS 15K HDDs) which has been recently updated from 2.2.5 to 3.5. As ...
    Jacek LuczakJacek Luczak
    Jun 2, 2016 at 11:43 am
    Jun 2, 2016 at 11:43 am
  • Some user lists allow it. Does the Cassandra community mind folks announcing their super cool Cassandra libraries on this list? Is there a page for us to list them?
    James CarmanJames Carman
    Jun 1, 2016 at 11:48 pm
    Jun 2, 2016 at 3:24 pm
  • Hello, I recently learnt that regardless of number of Data Centers, there is really only one token ring across all nodes. (I was under the impression that there is one per DC like how Datastax Ops ...
    Anubhav KaleAnubhav Kale
    Jun 1, 2016 at 7:41 pm
    Jun 3, 2016 at 10:17 pm
  • We have a 4 nodes, two dc's test cluster. All of them have datastax enterprise installed and running. One dc is the Cassandra dc, and the other is the Solr dc. We first used sstableloader to stream 1 ...
    Zhang, CharlesZhang, Charles
    Jun 1, 2016 at 2:55 pm
    Jun 1, 2016 at 2:55 pm
  • Hi, in the docs it still says that the sstableloader still uses gossip ( https://docs.datastax.com/en/cassandra/2.1/cassandra/tools/toolsBulkloader_t.html ...
    Matthias NiehoffMatthias Niehoff
    May 31, 2016 at 3:02 pm
    May 31, 2016 at 3:02 pm
  • Hi, All, We are considering to support more flexible searching on data in the Cassandra DB (used in our product). For example, full-text search and query data based on different columns. After some ...
    Lu, BoyingLu, Boying
    May 31, 2016 at 9:27 am
    May 31, 2016 at 10:20 am
  • 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 7, 2016 at 9:28 am
  • Let us assume that there is a table which gets only inserts and under normal circumstances no reads on it. If we assume TTL to be 7 days, what event will trigger a compaction/purge of old data if the ...
    Rakesh KumarRakesh Kumar
    May 30, 2016 at 10:55 pm
    May 31, 2016 at 4:26 am
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