Apache Cassandra is an open source distributed database management system.

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1answer
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OpsCenter on AWS: No permission to create /mnt/cassandra/data directory [on hold]

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 ...
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17 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
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1answer
21 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 ...
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votes
1answer
29 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: ...
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0answers
29 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 ...
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26 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
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1answer
67 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: ...
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32 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 ...
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votes
1answer
36 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
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1answer
25 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
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1answer
104 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 ...
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4 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
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1answer
21 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 ...
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0answers
19 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
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2answers
48 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 ...
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0answers
24 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 ...
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1answer
56 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 ...
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0answers
35 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 ...
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0answers
36 views

SAP HANA & CASSANDRA Data Integration

is there a way or method to integrate cassandra and sap hana for real-time data replication from sap hana to cassandra ? Is there any ready tools available to use ? Thanks.
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2answers
95 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 ...
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0answers
124 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 ...
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0answers
120 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 ...
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0answers
65 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 ...
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votes
1answer
118 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 ...
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1answer
112 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 ...
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145 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 ...
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1answer
315 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 ...
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1answer
282 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 ...
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1answer
315 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
170 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 ...
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0answers
250 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) ...
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1answer
30 views

How to reuse perf charts in OpsCenter from datastax?

Key idea of my question is that I want to use my predefined list of charts from OpsCenter for different keyspaces. So I need to figure out it there any possibility to create list of performance plots ...
0
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1answer
159 views

What does Opscenter's 'Write Requests' count shown as ops/sec exactly mean?

I have started understanding and working with cassandra recently. I have created two Column Families. For CF1, a write is an insert into a unique row with all column values. Eg: Sequence of insert ...
2
votes
1answer
161 views

Can I run multiple nodes of Cassandra on my mac without a virtual machine for each?

You can see in the doco here that setting up each instance of Cassandra requires a new 'node'. My question is - to run a cluster with multiple nodes of Cassandra on my Mac (Running Mavericks) - do I ...
1
vote
1answer
61 views

Not able to view data through Hive mapping to Cassandra

After loading data from Oracle DB to Cassandra via Sqoop, I was able to view my data through both Cassandra and Hive. I was told that while doing so, 2 files would be generated for each, creating ...
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3answers
629 views

DataStax Opscenter Agent can't connect: “Unable to locate cassandra.yaml configuration file”

I have installed Datastax Community Edition v2.0.3 on a Windows Server 2012 R2 Datacenter machine. After a vanilla install, I can't connect to the database with OpsCenter because the agent failed to ...
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85 views

OpsCentre 4.0 “Error creating cluster: Call to /cluster-configs timed out.”

This is the similar to Adding cluster: "Error creating cluster: Call to /cluster-configs timed out." but I cannot workout how to add my voice to that ticket. Installing OpsCentre 4.0 on ...
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1answer
171 views

Datastax OpsCenter 3.1.1 Agent JMX Authentication Error

I am using opscenter 3.1.1 and just enabled JMX username/password authentication on my Cassandra cluster. I think I've updated all my opscenter configs correctly to force the agents to use JMX auth, ...
2
votes
1answer
61 views

How can I view the cache-hit ratio for a single column-family in Cassandra?

I've enabled row-caching in for one of my column-families in Cassandra and I'l like to view the cache-hit ratio? I can see the cache-hit ration metric in Cassandra's OspCenter but it seems to show me ...
2
votes
1answer
90 views

DataStax OpsCenter 3.2.2 fails to start properly when storing collection data on different server

I'm trying to run OpsCenter 3.2.2 (enterprise edition) using a separate cluster used for storing the collection data. I specify the [storage_cassandra] tag in the cluster configuration. When starting ...
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1answer
211 views

0 connected nodes in datastax opscenter

Installed opscenterd on the separate node outside of the cluster, but within firewall ( aws security group ). Tested all possible ports between agents and opcenter server. No errors in the log.. ...
1
vote
1answer
244 views

How to run datastax opscenter behind nginx

I would like to run datastax cassandra opscenter behind Nginx. But it keeps adding opscenter port (8888 by default) to all urls. Is there a config setting to disable that or something? Here is my ...
0
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1answer
182 views

Trying to install datastax opscenter - Failed to load application: cannot import name _parse

I'm not familiar with python, maybe someone could explain what's going on here? ec2-user@prod-opscenter-01:~ % java -version java version "1.7.0_45" Java(TM) SE Runtime Environment (build ...
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0answers
43 views

Changing Cassandra Tokens on 1.2.1 From 4 to 256

We initially started our cluster using one datacenter, one rack, and the Simple replication strategy. We have keyspaces with several hundred gigabytes of data. When we changed the tokens in the ...
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1answer
202 views

Install DataStax Ops Center EC2

DataStax Ops Center EC2 multi region setup, with 2 nodes in us-east-1 and 2 in us-west-1 Ops center is installed on a separate ec2 instance, and can see the cluster, but I cannot get the agents ...
2
votes
1answer
45 views

Cannot generate cluster reports in OpsCenter.

I cannot generate a cluster report in OpsCenter. The server and clients are running on CentOS 5.9, 64bit. Software versions: opscenter-3.2.2-1 opscenter-agent-3.2.2-1 Here is the error reported ...
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2answers
1k views

Cassandra: Exception Connecting to 127.0.0.1/9160. Reason: Connection refused?

I have installed the Cassandra 1.2.9 into my vps server which is having CentOs. I have Installed it successfully. when i run the sh cassandra-cli, i got the error message ...
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0answers
444 views

cassandra: Failed to connect to '127.0.0.1:7199': Connection refused

I recently upgraded the version of my VirtualBox from 4.2.16 to 4.2.18.I have an Ubuntu 12.04 installed on the VirtualBox.I used to run cassandra locally before the upgrade. After the upgrade however ...
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1answer
268 views

Apache Cassandra Split Brain

First of all, apologies if this has been asked before, I cannot find an answer on Google or StackExchange. Is it possible to put Apache Cassandra into a split-brain scenario where a network ...
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1answer
826 views

DataStax Enterprise server won't start: dse dead but pid file exists

When I launch it with sudo /etc/init.d/dse start it seems to work. It returns: Starting DSE daemon dse DSE daemon starting with Hadoop and Solr disabled (edit /etc/default/dse to enable) But when I ...