Apache Cassandra is an open source distributed database management system.

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why is nodetool (cassandra single node) throwing NameNotFoundException: 'jmxrmi'?

Ubuntu 14.04 3.19.0-30-generic running cassandra 3.0.2. and oracle java version "1.8.0_72" i can see the port listening: 127.0.0.1:7199 0.0.0.0:* LISTEN 26048/java ...
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1answer
16 views

Adding a new node to a Cassandra deployment

I have a basic Cassandra deployment that contains a single node. I want to add a second node to the deployment, and I want clients to have access to the same data regardless of which node they happen ...
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34 views

Cassandra nodetool repair failure - broken pipe

we're trying to check our Cassandra cluster data integrity with: nodetool repair but after several minutes (~2-10min), we got strange connection resets / broken pipe stack trace on a first node: ...
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20 views

Cassandra: having trouble setting up cluster from existing node

I have on existing node, nodeA, at 10.43.0.15. I have that ip address set as its listen_address, broadcast_address, and broadcast_rpc_address. NodeA has data on it already, and I'd like to add another ...
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1answer
12 views

Cassandra JMX doc pointers

Any good starting URL/pointers for reading up on what could be monitored through JMX on cassandra 2.0? Think off pull data into an existing ELK stack from JMX on new Cassandra clusters, but never ...
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13 views

What is the alternate for Datastax cassandra core driver's DataType serialize/deserialize methods

We are using scala code run jobs from spark (1.5.2) which connects to Cassandra. The new saprk-cassandra-connector(1.5) depends on cassandra-driver-core-2.2.0-RC3. DataType serialize/deserialize ...
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1answer
70 views

Mesos slave IP for Marathon-launched ( docker container ) service instance

i have a docker image i would like to launch a couple instances of via Mesos/Marathon. i'm using BRIDGE networking in docker, and i would like to pass in the "public" ( i.e. not the container's ...
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1answer
32 views

How to start large cluster in reasonable time?

I have to start a large cassandra cluster and starting one node at a time will be painful. I don't want to set cassandra.consistent.rangemovement=false permanently but is there a way to set it only ...
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1answer
23 views

Cassandra security using openssl (not keytool)

I saw Cassandra documentation. http://docs.datastax.com/en/cassandra/2.1/cassandra/security/secureSSLCertificates_t.html I found this line "SSL certificates must be generated using keytool". But I ...
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1answer
54 views

Cassandra adding new datacenter in runing cluster

I am using cassandra dse 4.7, 3 node running cluster with one data center, now we are planning to add another data center with 3 nodes. I followed the steps mentioned in: ...
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1answer
127 views

How to solve ConfigurationException: Missing required directive CommitLogSync while configuring a multi node Cassandra cluster on Centos7?

Aim: to configure a multi node Cassandra cluster on Centos7 Method This documentation is used to configure a multi node Cassandra cluster. [user@cassandra01 ~]$ cat ...
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18 views

How do I properly update expired cassandra SSL certificates?

I have a cassandra cluster where each node has a self-signed certificate generated by keytool. The certificates were generated around the same time and all expired recently. Internode SSL ...
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1answer
39 views

Why can't I create nodes on EC2 default network with OpsCenter 5.2.1?

I've had to update our DataStax OpsCenter service from 5.1.3 to 5.2.1 because when I tried to add a new node to our Cassandra Cluster (DSE 4.6.6 on Amazon EC2) it said that "No nodes were available to ...
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1answer
48 views

How to scale Cassandra cluster vertically

I have a 3 node Cassandra cluster which I set up a year ago and it is getting quite slow now. It is much cheaper for me to scale vertically than it would be to scale horizontally ( I received free RAM ...
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1answer
56 views

What is the best way to get a list of nodes that belong to a Cassandra cluster?

I'm creating some scripts for some Cassandra clusters I operate. Some of these scripts need a list of nodes that are part of the cluster. nodetool status will print a list of the nodes and their ...
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1answer
373 views

Opscenter can not connect to the nodes

Our opscenter can not connect to the nodes, in the logs the next error appears: 2015-08-17 08:56:37+0200 [SNPaware_Cluster] INFO: Nodes with agents that appear to be no longer running: 172.31.7.245, ...
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1answer
100 views

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 ...
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1answer
95 views

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 ...
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72 views

Using external IP with DataStax Enterprise

We are in a situation where we need Cassandra nodes to be accessible from an external IP, but there is no interface with that IP; traffic to that IP is NATted to the node. Per DataStax's ...
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46 views

DROP TABLE makes C* unreachable

After a DROP KEYSPACE or DROP TABLE command from CQLSH I often get the output: errors={}, last_host=127.0.0.1 When I try restart with /opt/cassandra/bin/cassandra -f &; I have got this error: ...
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1answer
50 views

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 ...
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95 views

How to delete all data in a Cassandra

I'm looking for a way to delete all of data in cassandra using script shell who will be executed from rundeck job. thanks in advance
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1answer
92 views

Cassandra 2.0.16 pending tasks reporting bug?

Yesterday I upgraded my Cassandra cluster from 2.0.14 to 2.0.16, after upgrade, I am start seeing some strange behaviours of "PendingTasks" reporting. The Cassandra repository I am using is ...
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1answer
339 views

Cannot add an existing Cassandra cluster to OpsCenter ('ascii' codec can't encode character)

While trying to add an existing Cassandra cluster to OpsCenter I encountered the following error: Error creating cluster: 'ascii' codec can't encode character u'\u03a7' in position 0: ordinal not ...
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1answer
79 views

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 ...
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1answer
58 views

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 ...
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106 views

Cassandra - DataStax OpsCenter: Error provisioning cluster

I installed Cassandra on my local mac, together with opscenter from DataStax. When I create the new cluster, it gives me the error: Error provisioning cluster: Unable to login to some nodes. ...
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1answer
193 views

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 ...
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0answers
45 views

Trouble configuring Opscenter (5.1.1) Email alerts

I was wondering if anyone could assist me in figuring out why my opscenter email alerts aren't working. My environment is docker running in native network mode with opscenter in a container. ...
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256 views

Datastax Installation Opscenter errors

I am installing a 5 node cluster of Datastax Enterprise 4.7 on 5 separate AWS instances. I have gone through the installation process (simple install) and it appeared to succeed. However, upon ...
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1answer
214 views

EBS vs Instance Local storage for MongoDB in ec2

Cassandra recommends using instance local storage for EC2 deployments instead of EBS I am deploying MongoDB in EC2... should I also be using instance local storage instead of EBS PIOPS?
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1answer
353 views

nodetool repair fails with snapshot error

When running nodetool repair, the repair fails on the system_auth keyspace with the following log entries: INFO [AntiEntropySessions:5] 2015-03-17 20:00:34,795 RepairSession.java:260 - [repair ...
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1answer
3k views

datastax-agent Cannot connect Error

Seeing an issue with the Opscenter Agents. Opscenter reports the agents are not connected and in the agent.log on each node, they all report the following: ...
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1answer
63 views

Cassandra versions supported in OpsCenter 5.1.0

We are planning to use Cassandra 2.0.11 but the latest OpsCenter 5.1.0 doesn't support creating a new cluster with Cassandra 2.0.11 package. It shows only 2.0.9. How do we proceed?
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3answers
2k views

DataStax OpsCenter agent fails to start when Cassandra requires authentication

Problem I can not get OpsCenter get to connect to datastax-agent. It seems that datastax-agent starts and tries to connect to cassandra, fails because it does not know the correct credentials, but it ...
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152 views

cassandra on centos 7 - service control issues

I'm trying to join a set of new CentOS 7 servers to an existing cassandra cluster. All systems are running the same version (2.1.2). Running into these problems and would appreciate some pointers: ...
2
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1answer
216 views

Incredibly high load average on a Centos server

I have a Centos 6.4 server that's being used as a Cassandra node in a production environment, it is still working and responding to queries etc, but the load average is rather "high" a.k.a. buggy? In ...
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1answer
330 views

4 node cassandra - skip redundancy?

After much pleading and case building my group got the budget to buy 4 nodes and start a cassandra cluster. Each machine has 3x1Tb drives so I'm wondering whether it's reasonable to skip the 1 way ...
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2answers
1k views

Tunneling cassandra via ssh gives me a connection closed error

I have a server with two network interfaces. Cassandra is listening on a dedicated internal database network on eth1 (not accessable from outside). So I do my tunnel like this: ssh -f -N ...
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362 views

Repairing OpsCenter rollups60 Results in Snapshot Errors

I am running a 6 node cluster using Apache Cassandra 2.1.2 with DataStax OpsCenter 5.0.2 from the AWS EC2 AMI "DataStax Auto-Clustering AMI 2.5.1-hvm" (DataStax Community AMI). When I try to run a ...
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1answer
166 views

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 ...
3
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1answer
2k views

Cassandra: do more storage size, needs more CPU and RAM

I have gone through the recommended architecture of the Cassandra node configuration! according to which the recommended hardware infrastructure for the node is to have RAM: 16-32 GB, storage: 500GB ...
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0answers
1k views

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. ...
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1answer
179 views

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 ...
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1answer
1k views

How to resolve a stuck major compaction in Apache Cassandra?

I've got a one-node Cassandra cluster which is currently stuck in a major compaction process. After executing a nodetool compactit started the compaction and I see the tmp-sstable files with a size of ...
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1answer
197 views

Change hostname in datastax-agent

I've noticed when working in Opscenter that all the nodes are displayed with the result of hostname and their IP address. For an ec2 host this is a little redundant since the hostnames look like ...
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1answer
58 views

cassandra setup - uneven load - what did I do wrong?

For the sake of understanding I setup a 4 node cluster using the latest/greatest(released) version of Cassandra. The four nodes were brought up in sequence using almost entirely default settings and ...
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1answer
429 views

cassandra nodetool repair - how to schedule properly?

Im putting together a 16 node cassandra cluster (replication factor 2) and want to setup a schedule for nodetool repair. gc_grace_seconds is at the default. Two questions: My first impulse is to ...
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2answers
347 views

Cassandra: understanding replication factor

Hypothetical situation: Setup a cassandra cluster with N nodes. Create a keyspace and set replication_factor to 1 and use SimpleStrategy. Add some data. Remove 1 node. Does this mean that 1/N of ...
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1answer
252 views

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 ...