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Questions tagged [cassandra]

Cassandra is a highly scalable, eventually consistent, distributed, structured row/column store.

675
votes
6answers
286k views

MongoDB vs. Cassandra [closed]

I am evaluating what might be the best migration option.Currently, I am on a sharded MySQL (horizontal partition), with most of my data stored in JSON blobs. I do not have any complex SQL queries (...
394
votes
7answers
128k views

Difference between partition key, composite key and clustering key in Cassandra?

I have been reading articles around the net to understand the differences between the following key types. But it just seems hard for me to grasp. Examples will definitely help make understanding ...
156
votes
16answers
73k views

When NOT to use Cassandra?

There has been a lot of talk related to Cassandra lately.Twitter, Digg, Facebook, etc all use it.When does it make sense to:use Cassandra,not use Cassandra, anduse a RDMS instead of Cassandra.
116
votes
7answers
123k views

How to list all the available keyspaces in Cassandra?

I am newbie in Cassandra and trying to implement one toy application using Cassandra. I had created one keyspace and few column families in my Cassandra DB but I forgot the name of my cluster.I am ...
97
votes
3answers
25k views

What does “Document-oriented” vs. Key-Value mean when talking about MongoDB vs Cassandra?

What does going with a document based NoSQL option buy you over a KV store, and vice-versa?
87
votes
2answers
40k views

Difference between Document-based and Key/Value-based databases?

I know there are three different, popular types of non-sql databases.Key/Value: Redis, Tokyo Cabinet, MemcachedColumnFamily: Cassandra, HBaseDocument: MongoDB, CouchDBI have read long blogs ...
83
votes
4answers
43k views

Elasticsearch vs Cassandra vs Elasticsearch with Cassandra

I am learning NoSQL and looking at different options for one of my client's requirements. I have gone through various resources before putting up this question (a person with little knowledge in ...
80
votes
3answers
36k views

Large scale data processing Hbase vs Cassandra [closed]

I am nearly landed at Cassandra after my research on large scale data storage solutions. But its generally said that Hbase is better solution for large scale data processing and analysis. While both ...
77
votes
7answers
121k views

Cassandra port usage - how are the ports used?

When experimenting with Cassandra I've observed that Cassandra listens to the following ports:TCP *:8080TCP *:8888TCP *:57311TCP *:57312TCP 127.0.0.1:7000TCP 127.0.0.1:9160UDP 127.0.0.1:700...
77
votes
4answers
44k views

What is an SSTable?

In BigTable/GFS and Cassandra terminology, what is the definition of a SSTable?
71
votes
8answers
34k views

What should I choose: MongoDB/Cassandra/Redis/CouchDB? [closed]

We're developing a really big project and I was wondering if anyone can give me some advice about what DB backend should we pick.Our system is compound by 1100 electronic devices that send a signal ...
71
votes
1answer
18k views

Explain Merkle Trees for use in Eventual Consistency

Merkle Trees are used as an anti-entropy mechanism in several distributed, replicated key/value stores:DynamoRiakCassandraNo doubt an anti-entropy mechanism is A Good Thing - transient failures ...
70
votes
3answers
35k views

What is the difference between Cassandra and CouchDB?

I'm looking at both projects and I can't really see the differencefrom Cassandra Site:Cassandra is a highly scalable, eventually consistent, distributed, structured key-value store...Cassandra ...
64
votes
1answer
46k views

Deleting all rows from Cassandra cql table [duplicate]

Is there a command to all the rows present in a cql table in cassandra like the one in sql?delete from TABLEGoing by the documentation, I don't find any way to perform delete operation without a ...
63
votes
3answers
27k views

How does column-oriented NoSQL differ from document-oriented?

The three types of NoSQL databases I've read about is key-value, column-oriented, and document-oriented.Key-value is pretty straight forward - a key with a plain value.I've seen document-oriented ...

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