Apache Cassandra is an open source distributed database management system.

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7
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1answer
126 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 ...
0
votes
1answer
19 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 ...
0
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0answers
5 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 ...
0
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1answer
22 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 ...
0
votes
1answer
15 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 ...
0
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1answer
17 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 ...
0
votes
1answer
29 views

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 ...
0
votes
1answer
43 views

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 ...
0
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0answers
11 views

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 ...
1
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0answers
29 views

When adding data to cassandra cluster from C#, I get an this exception

From C# when I try to add data to a cassandra cluster, I get this exception: {Not enough replicas available for query at consistency One (1 required but only 0 alive)"} When I run nodetool from ...
0
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1answer
29 views

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 ...
1
vote
1answer
29 views

Datastax Opscenter 5.0: Getting “InvalidGroup.NotFound” when adding node via AWS

I am getting an "InvalidGroup.NotFound" when trying to add an additional node to my cluster through OpsCenter via AWS. The existing node running OpsCenter is in the VPC and is already using the ...
1
vote
1answer
66 views

Operator \> and \< (string version comparison) are not recognised in shell script

I am trying to run Casandra nodetool and getting warnings coming from .sh script. [root@d11ca4cc-fa95-c8a9-e133-e64c434f0e6f ~]# nodetool status /opt/local/share/cassandra/bin/nodetool[53]: .[97]: ...
0
votes
2answers
94 views

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 ...
0
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0answers
20 views

Cassandra 2.x - Problems with not accessible data

I had 3 nodes with 1.5TB of data. At some point my import hit a wall as disk space ended on one of those 3 nodes. I've resized disks and added 4 more nodes and 1.5TB of data more. I did also repair ...
0
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0answers
44 views

How to authenticate with cassandra-stress 2.1

Is there a way to authenticate to cassandra using the new cassandra-stress tool released with cassandra 2.1? It appears as if the '-un' (username) and '-pw' (password) switches have been removed from ...
0
votes
1answer
130 views

Cassandra 2.x - cluster does not rebalance after adding new nodes

I had 3 nodes, all with ~550GB, and added 4 more. I hoped that data would migrate on its own from old servers to new ones. Unfortunately after one day, data seems to stay in old places. In parallel, ...
0
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0answers
33 views

VPN load balancing between AWS regions for DataStax cluster

I am testing some DataStax Enterprise clusters in different AWS regions and working on a desirable architecture. Currently - I have one cluster with datacenters in us-east, us-west, and eu-ireland. I ...
1
vote
1answer
69 views

DataStax OpsCenter 5.0.0 API doesn't increase last_seen when nodes down if DataStax OpsCenter Agent is down, used to work with 3.2.2

I've been using the DataStax OpsCenter (Enterprise) 5.0.0 REST API with DSE 4.5.1 (Cassandra 2.0.9) to query the /$cluster_name/nodes endpoint and see the last_seen field for the number of seconds ...
2
votes
0answers
87 views

Does nodetool repair repair the next node?

Let's assume we have a Cassandra cluster with the following ring: A -> B -> C -> D (no virtual nodes), and we assume that all the data is stored at RF=2. Now let's say that B dies, leaving us ...
-2
votes
1answer
87 views

OpsCenter on AWS: No permission to create /mnt/cassandra/data directory [closed]

Followed the instructions here: http://www.datastax.com/documentation/cassandra/2.0/cassandra/install/installAMILaunch.html Installed OpsCenter on m3.large. When launching an instance, I get this ...
0
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0answers
56 views

Broken apt trying to install Cassandra

While trying to install Cassandra on Ubuntu 13.10, the installation crashed and now I'm stuck with broken (?) apt-get. Here is the output of an apt-get install -f: Reading package lists... Done ...
0
votes
1answer
28 views

How to copy perf graphs from one user to another in datastax OpsCenter?

I have lots of perf graphs in datastax OpsCenter under my "admin" user. I've created a new read-only user that i can let anyone in the company use, but how do i copy all the already configured perf ...
-2
votes
1answer
150 views

DataStax OpsCenter - can't connect with agents

I've installed DataStax OpsCenter (Apache Cassandra) and in OpsCenter, there is an error: "0 of 1 agents connected". When I click "fix", enter credentials and try to install nodes, i get error: ...
0
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0answers
90 views

Creating Table in mariaDB - ERROR 1429 (HY000)

I successfully integrated mariaDB-10.0.13 with Cassandra-2.0.8 and 2.0.9 I was able to created a table present in cassandra on mariaDB and was able to query successfully. But my problem is that ...
0
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0answers
209 views

Opscenter is unable to install agents due permission denied to /tmp

O am not able to install agents on 10.0.0.29 IP through opscenter. It says below error. The user is pavan and this user is having sudo access. Opscenter is unable to install the agents and I'm not ...
0
votes
1answer
394 views

Setting-up OpsCenter gives: scp /tmp/.. Permission denied

I'm trying to setup OpsCenter by adding my localhost Cassandra node (for testing). The login credentials I used for SSH has sudo/root rights, nevertheless I get the error: scp: /tmp/tmpXInRfq: ...
1
vote
0answers
142 views

Adding Cassandra Node in OpenShift to Existing Cluster

I have 3 cassandra nodes(S1,S2,S3) which are installed on CentOS 6. Two of them (S1,S2) are in datacenter A and one of them (S3) is in openshift. I am trying to make benchmark test with multiple node ...
0
votes
1answer
175 views

OpsCenter 5.0: No Data on Dashboard Graphs

I have an OpsCenter 5.0 instance running and 10 agents connected. The agents are in 2 regions in AWS, so everything is using external addresses to communication. All the necessary ports are open, ...
0
votes
1answer
45 views

Opscenter 5.0: User management query

I've installed the free tarball version of opscenter and am having problems with the user management aspect of it. I have authentication enabled via: [authentication] enabled = true ...and can ...
0
votes
1answer
306 views

Opscenter 5.0: error when adding cluster, cluster added anyway, no clusters shown

I have a new Opscenter installation. After adding my "existing cluster" to opscenter, I get the following error dialog boxes: Error creating cluster: Cannot read property 'datasource' of undefined ...
0
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0answers
30 views

Cassandra - moving data from multiple nodes to a single node

I need to copy data from 3 nodes to a single node. I know about snapshot command and I was able to successfully copy data from a cluster where each node had 100% data (full replication) to a ...
0
votes
1answer
59 views

Opscenter 4.1.4: Authentication failing

I'm getting authentication errors when starting the opscenter agents on each of my cassandra (v1.2.5) nodes: INFO [main] 2014-07-23 12:18:03,880 Starting Stomp INFO [main] 2014-07-23 12:18:03,881 SSL ...
0
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0answers
29 views

Accidentally added node to wrong datacentre in Cassandra

I accidentally set a node to DC1 when it should have been DC2 . In cassandra-rackdc.properties I started the node and in opscentre it added it to DC1. I then stopped the node and changed the config ...
1
vote
2answers
80 views

EC2 Attach Instance Store on Start

I'm lunching an instance to host a Cassandra node and i'm testing some shutdown and startup scripts. The instance was lunched from the datastax PV AMI 'ami-8932ccfe'. I added 8GB of SSD EBS storage ...
0
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0answers
38 views

Replace existing DataStax OpsCenter Installation in EC2

I'm using DataStax OpsCenter v3.2 installed on an EC2 instance. AWS is going to retire the instance, so I set up a new instance, installed OpsCenter, and tried to connect to my cluster. I got the ...
-1
votes
1answer
183 views

Opscenter repair service times out. ERROR: Requested range intersects a local range […]

My production cluster had the repair service enabled since april 16th with the default 9 days time to completion and repairs would complete properly. However, since may 22nd, it is being disabled ...
0
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0answers
68 views

Cassandra hangs with kernel exception when adding jna jar to classpath

I have a fresh installation of cassandra v2.0.8 on a RedHat Enterprise Linux v5. I have added a sym link of the jna.jar in cassandra's /lib folder. I start cassandra and it hangs after printing out ...
0
votes
2answers
231 views

CentOS: OpsCenter does not see other node's agent

I'm new with Apache Cassandra. I am trying to install a little sample cluster using two CentOS server. I followed the documentation (Tarball installation) and the nodes are up. However, when I go to ...
0
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0answers
152 views

In DataStax Community Edition 2.0.6, OpsCenter appears to require OpenSSL for Windows

Until yesterday, I was running the DataStax Cassandra Community Edition 2.0.5 just fine, both with Cassandra 2.0.5 and later with the Apache Cassandra 2.0.6 inserted underneath it. I had to ...
0
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0answers
195 views

OpsCenter doesn't display disk space

I've looked through multiple forum posts, I've turned on debug et al, and I still cannot for the life of me figure out why the disk space isn't working. ALL other information is filled--except for ...
1
vote
0answers
92 views

Datastax Opscenter Agent installation is broken re: log4j

I am trying to install Opscenter, and datastax agent on our Cassandra cluster. When I start the datastax-agent, I am getting this error: log4j:WARN No appenders could be found for logger ...
-1
votes
1answer
242 views

Opscenter 4.1 - ssl agent communication vs internal authentication

My question relates to Opscenter 4.0.2 and Cassandra 2.0.4 with SSL and Auth : agent can't connect. The provided answer does help, but creates another problem. To summarize, everything runs find ...
1
vote
1answer
169 views

Opscenter 4.1 can't add cluster

When trying to add an existing cluster to Opscenter via the 'add cluster' gui screen I am getting the following error: Error creating cluster: OpsCenter was able to get the cluster name but not list ...
0
votes
0answers
158 views

Opscenter max arg is an empty sequence

I install on server(debian) cassandra and opscenter. When I try to "Managa Existing Cluster" and "Save Cluster", get error "Error creating cluster: max() arg is an empty sequence". Here is log from ...
0
votes
1answer
449 views

Opscenter 4.0.2 and Cassandra 2.0.4 with SSL and Auth : agent can't connect

I setup cassandra with inter-node SSL and client-to-server SSL and basic password auth. No problem using cqlsh or python to connect to cassandra with any certificate as certificate_validation is ...
0
votes
1answer
415 views

Cannot start cassandra: numactl: execution in CentOS 6

I trying to install Datastax Apache Cassandra with OpenJDK # java -version java version "1.7.0_51" OpenJDK Runtime Environment (rhel-2.4.4.1.el6_5-x86_64 u51-b02) OpenJDK 64-Bit Server VM (build ...
0
votes
1answer
551 views

Cassandra native port 9042 slow on ec2 while 9160 is fine [duplicate]

I have a 5 node Cassandra cluster set up on EC2, all in the same region. If I connect over cqlsh (9160), queries respond in under a second. When I connect via Dev Center, or using the native Java ...
2
votes
1answer
285 views

Cassandra EC2 slow response time

I have been developing with Cassandra locally for a while and response times on queries are in the region of 50ms. I have set up a 5 node EC2 cluster from the cassandra community ami, everything went ...
1
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0answers
311 views

Cassandra: Can't start service with error: java.lang.IllegalStateException: Unable to contact any seeds

System info: Linux stg-univ-cassandra06 2.6.32-358.23.2.el6.x86_64 #1 SMP Wed Oct 16 18:37:12 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux Cassandra version: 2.0.1 JVM vendor/version: Java HotSpot(TM) ...