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Questions tagged [cassandra-0.7]

Cassandra is a highly scalable, eventually consistent, distributed, structured key-value store.

Version 0.7 of Cassandra: a highly scalable, eventually consistent, distributed, structured key-value store.

51 questions
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how to integrate cassandra with zookeeper to support transactions

I have a Cassandra cluster and Zookeeper server installed. Now I want to support transactions in cassandra using zookeeper. How do i do that. Zookeeper creates znodes to perform read and write operations and data to and fro goes through znodes in…
Vaibhav Singh
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How to remove dead node out of the Cassandra cluster?

I have the cassandra cluster of 12 nodes on EC2. Because of some failure we lost one of the node completely.I mean that machine do not exist anymore. So i have created the new EC2 instance with different ip and same token as that of the dead node…
samarth
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Availability of Cassandra

I am running into an issue "me.prettyprint.hector.api.exceptions.HUnavailableException: : May not be enough replicas present to handle consistency level." when I have RF=1, Read Consistency Level = 1 and one of the nodes in 6 node ring/ cluster is…
Vinay Kumar Chella
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Cassandra: How to get a list of processes?

Hello Cassandra Experts, How can I get a list of processes in Cassandra cluster (similiar to the show processlist command of MySQL)? Im puzzled as to why I cannot find any posts anywhere about this topic. Thanks.
user3448124
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3 answers

Hector to connect with Cassandra

im trying to connect cassandra with Hector: public class Main { public static void main(String[] args) { StringSerializer stringSerializer = StringSerializer.get(); Cluster cluster = HFactory.getOrCreateCluster("Test Cluster",…
walves
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cassandra - not able to insert decimal numbers using ruby client in a composite column

I have a composite column family with the following schema CREATE TABLE employees ( name varchar, month int, date int, salary decimal, …
user1652840
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cannot delete row key

I'm having an issue while deleting row key in Cassandra. Whenever I delete Row Key all the columns contained by that RowKey are deleted but RowKey itself is not deleted. Can anybody tell me how to remove a rowkey, once it is inserted in…
dinesh028
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Unable to add nodes to existing Cassandra Cluster

We have cassandra cluster of 6 nodes on EC2,we have to double its capacity to 12 nodes. So to add 6 more nodes i followed the following steps. 1 Calculated the tokens for 12 nodes and configured the new nodes accordingly. 2 With proper configuration…
samarth
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3
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3 answers

WSO2 DSS Cassandra Dependency

Is the integrated Cassandra server(version 0.7.x) loosely coupled with WSO2 DSS (version 2.6) or not? Will the usage of a newer version of Cassandra (e.g. 0.8.x) affect the DSS in the low level? Thanks
fgakk
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Even partitioning of nonuniform ranged data in cassandra

I've got a rather tricky one, bear with me as I try not to stumble over my words here. I'm doing some research, and my group is transitioning to a cassandra database. Our research used MySQL before, but the data outgrew the database (192 million…
Chris Eberle
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Why am I getting an Invalid UUID String when I update Cassandra column metadata?

I'm trying to define a schema in Cassandra 0.7 and would appreciate help resolving an issue I ran into. I set up a Super Column Family in cassandra-cli: create column family SimulationSummary with column_type='Super' and…
dr.
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How to programatically add index to Cassandra 0.7

I tried to run the demo on http://www.riptano.com/blog/whats-new-cassandra-07-secondary-indexes programatically, but the results are different from running it in CLI. It seems like Cassandra can only index columns after index is added. All previous…
tanyehzheng
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Inserting same data to cassandra database

I have a question what if we try to insert same data to cassandra database . Here by same i mean a set of 100 rows is already present in cassandra database say in a test column family .Again if we try to insert the same 100 rows to cassandra…
user1278493
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How can i retrieve data from two tables in Cassandra Database

I have to retrive the data from two tables, Here are my two tables in Cassandra DataBase. employee is keyspace, Two tables: emp:- "eno" is primay key,"username","password" Dept:-"dno" is primary key ,"eno","dname" Now i want to retrieve the data…
user1983299
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how to get type of column value

I 'm using Java to connect to Cassandra. I want to do something like check the data type of column i.e; whether it is long or UTF-8 Because, if it is long then I can get the value as column.value.getLong() but if it is UTF-8 or other, I have to…
dinesh028
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