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Questions tagged [cassandra]

Apache Cassandra is an open source distributed key-value database cluster, designed to scale linearly when adding nodes. It provides multi-datacenter replication.

It was designed to handle very large amounts of data spread out across many commodity servers while providing a highly available service with no single point of failure. It is a NoSQL solution that was initially developed by Facebook and powered their Inbox Search feature until late 2010.

Official page

Source: wikipedia

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cassandra node discovery

I just set up a 3 node system with ip addresses "192.168.0.101", "192.168.0.102", "192.168.0.103". I have set the seeds value on the configuration of all three machines as seeds: "192.168.0.101,192.168.0.102,192.168.0.103" However, on running…
user44468
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Processing pre-existing log files with Flume

I have a large set of log files that I need to extract data from. Is it possible to use Flume to read these files and dump them into an HDFS (Cassandra, or another data source) which I can then query? The documentation seems to suggest it's all…
duckus
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Cassandra: capacity planning

Im investigating moving some large DBs from MySQL to Cassandra and Im trying to figure out how to plan the cluster. Historically, one would just buy disks to contain the relevant data but Im not clear on how Cassandra uses disk space vs RAM space.…
ethrbunny
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Can't upgrade my Ubuntu server, it gets stuck on openjdk-6-jre-headless

I am using Ubuntu Server. When I do: apt-get upgrade it gets stuck on: Setting up openjdk-6-jre-headless (6b20-1.9.7-0ubuntu1) ... Why? And what can I do to stop it? I tried removing it with apt-get... I get this error: E: dpkg was interrupted, you…
jnbdz
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Unable to connect to cassandra when using the AllowAllAuthenticator

I installed cassandra on a VM running Ubuntu Server 10.10. cassandra login failure with org.apache.cassandra.auth.AllowAllAuthenticator but I always receive the following error message: Login failure. Did you specify 'keyspace', 'username' and…
Jason Axelson
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CentOS open port 7000 [RESOLVED]

I have two boxes one ubuntu v10.10 (IP: 192.168.12.128) and another centos v5.5 (IP: 192.168.12.131) I m able to ping centos from ubuntu box and vice versa. When I telnet UBUNTUIP using port 7000 from centos it works when I telnet CENTOSIP using…
Sudesh
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Cassandra on Linode: Dark magic isn't working

Yes, I realize I'm crossing the streams by running Cassandra on Linode. Yes, I know it would be better to run it on Rackspace or Amazon, but that's immaterial right now. Basically, I've got a Private IP set up for each Linode that I plan to include…
mattbasta
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Cannot to connect to a Cassandra DB from localhost

I don't know if I'm on the right site, I installed OpenSolaris a single cassandra node, I don't have other node. On the same server, I install Ruby 1.8 with the gem Cassandra. If I try to connect from my computer to the Cassandra node through the…
DJYod
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Which version of the JDK should we install for Cassandra 4.0.1

We are planning to upgrade our Cassandra servers from 3.0.11 to 4.0.1 Here it says to use JDK 8. I would like to know if as of this writing this is still the case. I believe the latest released Oracle version is JDK 17.
adinas
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High CPU usage and traffic on some Cassandra nodes

As stated in the title, we are having a problem with our Cassandra cluster. There are 9 nodes with a replication factor of 3 using NetworkTopologyStrategy. All in the same DC and Rack. Cassandra version is 3.11.4 (planning to move on 3.11.10).…
kylethedeveloper
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Throttle Spark Cassandra Connector Reads on a Production Cluster

We're currently running a 24 Node Cassandra Cluster in Production that holds 30Tb of data and handles an average live load of 100k Requests Per Min 24/7. We support multiple partners. One of our partners are leaving our Org, so we have to filter…
Mano
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cassandra backup - errors during compression

My cassandra backup often returns with errors because users move/change it during the compression (we just tar it). Users are logged to the server 24/7 so we can't just change backup hours. I need some ideas/solutions how to avoid those errors or a…
Galmachar
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cassandra replication not 100 percent on each node

I had Cassandra cluster of 3 nodes. I was performing some colud migration activity and for that, I added two more nodes in an existing cluster and the result is as follows. Datacenter: datacenter1 ======================= Status=Up/Down |/…
innervoice
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Elassandra "action_request_validation_exception"

Elasticsearch DEBUG: 2019-09-23T09:23:39Z starting request { "method": "HEAD", "castExists": true, "path": "/my_keyspace", "query": {} } Elasticsearch TRACE: 2019-09-23T09:23:39Z -> HEAD…
Max0999
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System_auth keyspace overwritten in Cassandra cluster

I was adding a Node2 to another cassandra Node1 to form a cluster and I lost my user database (which caused authentication problems). I appreciate if someone can help me to understand what happened (to avoid that from happening again the next time I…
wmac
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