Apache Cassandra is an open source distributed database management system. It is 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.

learn more… | top users | synonyms

1
vote
1answer
34 views

Keeping rows ordered by counter value

I'm storing linked words in a Cassandra v2 cluster and I'm having a hard time doing efficient reads. I'm trying to fetch the top X rows with the highest counter value. Cassandra doesn't store the ...
0
votes
1answer
422 views

How to create multiple graphs with TitanDB (+Cassandra) in the same machine?

I'm experimenting with TitanDB (with Cassandra as storage) + Rexter. I've been reading the documentation during hours and trying to create multiple graph DBs on the same machine, but I didn't find ...
0
votes
1answer
1k views

Cassandra: Request did not complete within rpc_timeout

i was working with Cassandra 1.2.4 probably, after restoring some key-space when i tried to query in a key-space it gave me Request did not complete within rpc_timeout so i checked system.log & ...
2
votes
0answers
232 views

Strugling with updating a cassandra row in FluentCassandra

I have this problem with using Fluent Cassandra in a test application. All I want to do is set the IsOnline field to true inside the SignIn method, but I keep getting the exception supercolumn ...
0
votes
0answers
17 views

Cassandra CL quorum giving inconsistent values

How is this even possible? cqlsh:keyspace> consistency Current consistency level is QUORUM. select * from email_idx where email='xxx@yyy.com'; email------------------- | user_id ...
0
votes
0answers
8 views

cassandra:request didn't complete with rpc_timeout

cassandra:request didn't complete with rpc_timeout.I Have set up a cassandra server of only one node and import 60 lacs record.but when we run select query it show error of rpc_timeout over 10000 ...
0
votes
0answers
15 views

How to apply updates in a “Fan out on write” architecture?

If I copy certain writes to different tables for faster read performance on certain queries(fan out on write), how should I design updates? Since the data is spread over different tables, I'm trying ...
0
votes
0answers
116 views

Cassandra cluster on Windows Machine

I am new to Cassandra, and have been trying to create a cluster using DevOps. When I add a node , I get the following error: Error provisioning cluster: Unable to SSH to some of the hosts ...
0
votes
0answers
101 views

Cassandra: unstructured document storage?

I'm fairly new to NoSQL, but fairly experienced with SQL-based relational databases. We are evaluating Cassandra for one of our applications. I've seen where Cassandra is claimed to be able to store ...
0
votes
0answers
48 views

Upgrading Cassandra

my Cassandra version is 1.2.4 and i'm trying to upgrade it to 2.0.5 and i know that in the first part i have to upgrade it to 1.0.14 and after that try to upgrade it to the 2.0.5 , when I try to run ...
0
votes
0answers
36 views

Restoring Cassandra fails

I try to restore a Cassandra table from snapshot , but when i try to see the result the query give me a rpc_timeout so i tried to see the log files java.lang.RuntimeException: ...