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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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Datastax Agent 5.1.3 Short os-stats collector failed

after starting datastax agent 5.1.3 on our new servers we are getting following error in the agent.log. ERROR [os-metrics-6] 2015-08-05 13:49:41,565 Short os-stats collector failed java.lang.NullPointerException at…
Olqs
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Opscenter 5.2 missing data for 1day and 1week graph scale

I recently update Opscenter from 5.1 to 5.2, and yesterday just discovered that if I select different 1day or 1week graph scales no data will be shown in the graph. I checked the logs and the chrome console and no issue there, the requests just got…
Luigi
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Unattended install (upgrade) of cassandra via chef

I'm creating a cassandra upgrade/install recipe with chef. package "cassandra" do version "2.1.8" action :install end When I install over the top of an existing version I get prompted about new config files. Configuration file…
jorfus
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Cassandra NetworkTopologyStrategy

I would like to configure the following multi-datacenter Cassandra cluster: DC-EUROPE has 3 Cassandra nodes (1.1.1.1, 1.1.1.2, 1.1.1.3) DC-ASIA has 3 Cassandra nodes (2.2.2.1, 2.2.2.2, 2.2.2.3) Each DC has an eventually consistent full-copy (1:1)…
Mark
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Installing tablesnap

I'm trying to install tablesnap in my Cassandra servers, following what I have found in the Jeremy Grosser's Github repo tablesnap but I am not able to do it. I'm not a system administrator and I'm sure this is related with my ignorance but I have…
Janbalik
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OpsCenter 5.1.2 fails to start with SSL enabled on CentOS 5

This applies to OpsCenter 5.1.0 and 5.1.1 as well. I got the following error when trying to run OpsCenter 5.1.2 on a CentOS 5 server: Unhandled Error Traceback (most recent call last): File…
Gene
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datastax opscenter - how is 'storage capacity' determined?

I installed the OS version this recently (5.0.2) and am wondering about this graph. To date I've had a hard time finding a metric for 'cluster capacity' when it comes to Cassandra. Magically, datastax seems to have an answer. How?
ethrbunny
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Opscenter is connected to datastax agents but no data available

We installed opscenter and datastax agents on a cluster with private network through datastax community packages. Configurations seems to be ok and we don't have connectivity issues on jmx or stomp. Just one error occured linked to df command…
dal
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How to avoid constant schema disagreement flapping in Cassandra?

We have a 3 node Cassandra cluster with a small amount of data on 'em (about 2.3GB total). The nodes are hosted on GCE and each have four cores and 16GB memory. We're running the Debian package build of Cassandra 2.1.1. The lone keyspace we have…
internetdotcom
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Which direction does `nodetool repair` go?

Let's say I log into a Cassandra node X and issue nodetool repair. Will I only repair the data residing on X? Or will I also automatically repair all other nodes that have replicas of what X holds (that is, reconsile data inconsistencies two-way)?
Ztyx
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Agent connected to Opscenter but no data available

I'm currently running Cassandra, the OpsCenter, and the OpsCenter agent all on my dev Windows box. The agent is successfully connected to OpsCenter and I can see it listed there along with the amount of disk space it is using. However, no other…
David Bryant
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Can't get datastax-agent to run on a new node

I'm trying to install the datastax-agent on a new CentOS node (there are 3 other nodes currently up and running correctly). After installing the datastax-agent via the Opscenter UI it appears to install but still claims only 3 of 4 agents are…
zoo_live_crew
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Cassandra: when to add capacity?

How does one know when it's time to add capacity to a cassandra cluster? Error msgs? Performance? Some other tell-tale sign? Since capacity planning with Cassandra is a (seemingly) black art knowing where to start and when to grow could be somewhat…
ethrbunny
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Multiple data centers and DataStax OpsCenter

Multiple questions regarding DataStax OpsCenter. I am evaluating for our use OpsCenter 5.0.1 I am able to build a cassandra cluster using opscenter sucessfully. However, all nodes belong to one datacenter. How can I build a cluster with multiple…
vishr
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azure endpoint for cassandra does not work for ports 7000, 7001, 7199

I have setup apache cassandra on a centos7 compatible linux machine in azure. I can telnet directly to port 7000, etc on the IP address on the machine, however I cannot telnet to that same port from the outside. Port 22 works fine as an endpoint,…
nullcable
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