datastax

Using OpsCenter 5.1.0 and trying to add S3 as a location for snapshot backups. What are the necessary permissions in AWS IAM for the opscenter user? So far, I have the following policy: "Statement": [ { "Effect": "Allow", "Action": [ "s3:ListAllMyBuckets", "s3:GetBucketLocation" ], "Resource": "arn:aws:s3:::*" }, { "Effect": "Allow", "Action": [ "s3:ListBucket", "s3:GetBucketLocation" ], "Resource": [ "arn:aws:s3:::cassandra-bkup" ] }, { "Effect": "Allow", "Action": [ "s3:DeleteObject", "s3:GetObject", "s3:PutObject" ], "Resource": [ "arn:aws:s3:::cassandra-bkup/*" ] } ] but backups are still

When I try to start cassandra on ubuntu 12.04 (installed via Datastax's dsc20 package) as a service as follows : $ sudo service cassandra start it says *could not access pidfile for Cassandra & no other messages or anything in logs. But when I try to run as a root user( sudo cassandra -f ) it just works properly & cassandra is started. While trying to debug I found that when trying to run as a non-root user I was getting these messages: ERROR 17:48:08,432 Exception encountered during startup java.lang.AssertionError: Directory /var/lib/cassandra/data is not accessible. .. java.io

I would like to run Cassandra Datastax Enterprise on Amazon EC2 instances using not the node private IP address but Elastic Public IPs My current configuration looks as follows: /etc/dse/cassandra/cassandra.yaml seed_provider: - class_name: org.apache.cassandra.locator.SimpleSeedProvider parameters: seeds: "publicIP" listen_address: "publicIP" endpoint_snitch:Ec2Snitch rpc_address: "publicIP" The "dse" service is not starting properly. /var/log/cassandra/system.log is showing the following error: org.apache.cassandra.exceptions.ConfigurationException: Unable to bind to address /<publicIP>:7000

This is a super basic question but it's actually been bugging me for days. Is there a good way to obtain the equivalent of a COUNT(*) of a given table in Cassandra? I will be moving several hundreds of millions of rows into C* for some load testing and I'd like to at least get a row count on some sample ETL jobs before I move massive amounts of data over the network. The best idea I have is to basically loop over each row with Python and auto increment a counter. Is there a better way to determine (or even estimate) the row size of a C* table? I've also poked around Datastax Ops Center to see

I'm building a backup and restore process for a Cassandra database so that it's ready when I need it, and so that I understand the details in order to build something that will work for production. I'm following Datastax's instructions here: http://www.datastax.com/documentation/cassandra/2.0/cassandra/operations/ops_backup_restore_c.html . As a start, I'm seeding the database on a dev box then attempting to make the backup/restore work. Here's the backup script: #!/bin/bash cd /opt/apache-cassandra-2.0.9 ./bin/nodetool clearsnapshot -t after_seeding makeyourcase ./bin/nodetool snapshot -t