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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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Is Elastic Workload Re-provisioning still possible with DataStax Enterprise 3.1?

In the documentation of DataStax Enterprise (DSE) 2.0 there is a chapter about "Elastic Workload Re-provisioning" (http://www.datastax.com/docs/datastax_enterprise2.0/workload_reprovisioning) but it the DSE 3.1 documentation this part is missing. Is…
mschenk74
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Connecting to Cassandra Cluster

I'm just getting started with Cassandra and had a few questions. I'm going to be deploying a 4 node cluster on AWS as per the DataStax documentation (http://www.datastax.com/docs/datastax_enterprise3.1/install/install_dse_ami). Once I have this 4…
Schodemeiss
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Opening ports in EC2

I have an ec2 instance. I have opened a port in the security group for cassandra (9160) and have cassandra listening on it. If I use nmap on the instance, that port does not show up, and I cannot connect to the cassandra node remotely via…
Charlie Andrews
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My application server can't connect to my DB Cassandra server

I have two servers. One has PHPCassa with a small app, the second has Cassandra install. Here is the error I get: An attempt was made to connect to every server twice, but all attempts failed. The last error was: TException:TSocket: Could not…
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Do I need to install Thrift on both my servers (Application/DB)?

Here is my situation. I have two servers. One as all my applications (PHP), the second as Cassandra DB with Solr (Solandra), and OpsCenter. I am using PHP on my application server to access my Cassandra data with PHPCassa. My question is, do I need…
jnbdz
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DB Migration switching from MySQL

I currently have a massive MySQL Data but would like to move over to Cassandra nosql. How hard of a move over would this be? I've not found any examples yet on this being done. It is possible right.
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How to choose NoSQL database engine?

We have a database with following specs: 30k records, 7mb in size 20 inserts/second 1000 updates/second 1000 range selects/second, by secondary index, approx 10 rows each needs at least one secondary index needs some mechanism to expire keys if…
Poma
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How to find causes for the casandra killing frequently?

Installed the cassandra 0.8 in centos linux system with 1GB ram. Within an hour after starting the cassandra, it is dying frequently. Also, i can say java is also killing , which is necessary for running cassandra So, may i know, how to find the…
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One ColumnFamily places data on only 3 out of 4 nodes

I have posted this on cassandra-user mailing list however didn't get any responses just yet and I was wondering whether someone here on serverfault.com will have any ideas. I seem to have came across rather weird (at least for me!) problem /…
bart613
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Cassandra-cli could not connect to localhost

I have installed cassandra 1.0.1 stable binary in ubuntu server 11.10 amd64. But, when i try to connect using cassandra-cli with: [default@unknown] connect localhost/9160 The system always stuck, and return this ... Any idea? Thanks for the…
rizalp
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introduce latency between ec2 instances

I have a 2nodes Cassandra ring on ec2 (10.96.31.143, 10.254.94.177) in the same zone (east-1). How can I introduce a 3 seconds delay for all cassandra-related network communications between them? I found 'dummynet' via Google as a possible solution…
knguyen
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Installing Thrift with Solandra

I am trying to install Thrift with Solandra. Normally when I just want to install Thrift with Cassandra, I followed this tutorial: https://wiki.fourkitchens.com/display/PF/Using+Cassandra+with+PHP But how can I do the same for Solandra? Thrift with…
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Ubuntu: Freeing up ports?

I have tried to install cassandra on my Ubuntu test environment, but what happens when I try to start it is that I get the following error: java.net.BindException: Address already in use I have tried port 3072, 10032 and 8080 in the config, but it…
Industrial
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Necessity to backup Cassandra system keyspaces

I was wondering about the necessity to backup (in order to restore of course) the system keyspaces of Cassandra. My backup/restore procedure is the following: backup: snapshots (nodetool) + dump of keyspaces (cqlsh DESC keyspace) on all cluster…
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Connection error: (Unable to connect to any servers, {127.0.0.1:9042: ConnectionRefusedError(111, Tried connecting to [(127.0.0.1, 9042)]

Sometimes when I try cqlsh command on my Ubuntu 22.04 machine I get the following error: Connection error: (Unable to connect to any servers, {127.0.0.1:9042: ConnectionRefusedError(111, Tried connecting to [(127.0.0.1, 9042)]. Last error:…
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