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Questions tagged [cassandra-2.0]

Cassandra 2.0 is a NoSQL database sponsored by Apache.

Cassandra 2.0 is a NoSQL database sponsored by Apache.

Cassandra advertises itself to have the following merits:

  1. Proven (used by many large established companies);
  2. Performant (peforms consistently well on NoSQL benchmarks);
  3. Fault tolerant (data is automatically replicated to multiple nodes for fault-tolerance. Replication across multiple data centers is supported. Failed nodes can be replaced with no downtime.);
  4. Decentralized (there are no single points of failure and no network bottlenecks. Every node in the cluster is identical);
  5. Durable (durability is the property that writes, once completed, will survive permanently, even if the server is killed or crashes or loses power.); and
  6. Elastic (read and write throughput both increase linearly as new machines are added, with no downtime or interruption to applications);
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Cassandra PDO connection PHP

I've got Cassandra working nicely on Debian server however I'm hoping to connect to it from a PHP application. Currently it seems PDO it the way to go for anything complex as I'm able to use CQL. I'm using the latest forked version of the Apache…
user1641165
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Cassandra rpc timeout occurring during heavy writes and deletes

I'm using cassandra 2.0, and I have created a column family that looks like this: CREATE TABLE user_id_timestamp_index ( user_id int, timestamp text, PRIMARY KEY (user_id, timestamp) ) WITH bloom_filter_fp_chance=0.010000 AND …
user1200518
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Authentication error on host /127.0.0.1: SASL Authentication is not supported in version 1 of the protocol

Getting following exception while connecting to Cassandra Cluster withAuthentication: Exception in thread "main" com.datastax.driver.core.exceptions.AuthenticationException: Authentication error on host /127.0.0.1: SASL Authentication is not…
mangeeteden
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Cassandra multiple writes distribution

I have a 3 nodes Cassandra (2.0.3) cluster installed here's my table: CREATE TABLE user ( id text, phone text, name text, email text, PRIMARY KEY (phone, id) ); I use the datastax java driver here's my user object creation: User…
Aviram
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DataStax Opscenter Agent doesn't connect: "Unable to locate cassandra.yaml configuration file"

I have installed Datastax Community Edition v2.0.3 on a Windows Server 2012 R2 Datacenter machine. After a vanilla install, I can't connect to the database with OpsCenter because the agent failed to start: it says "0 of 1 agents connected" in the…
Rik
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How to set ttl in a column family using hive

I Am using Datastax for Cassandra and on top of CFS , Iam trying to load the data using Hive.Cassandra having TTL(time to live) at column level while insering and updating.My question is how can we achive the same TTL when we load the data using…
user1574196
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Cassandra 2.0 cluster's PasswordAuthenticator fails to init default user: "some nodes were not ready"

How to setup this? I have a three node cluster with replication factor 3, and getting the following errors at startup: WARN [NonPeriodicTasks:1] 2013-10-08 14:06:42,751 PasswordAuthenticator.java (line 242) PasswordAuthenticator skipped default user…
Eemeli Kantola
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Cassandra commands over network

Hi i am new to Cassandra. Can anyone please tell me how Cassandra queries are transfered over network like i have a C program to do all the queries in one network and Cassandra database in another network. Is there anything to be modified in .yaml…
Msm
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Cassandra aggregation

The Cassandra database is not very good for aggregation and that is why I decided to do the aggregation before write. I am storing some data (eg. transaction) for each user which I am aggregating by hour. That means for one user there will be only…
RhishiM88
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Selenium web driver with Cassandra service

How to connect the Cassandra service with the selenium webdriver ? so that we can easily validate the required data in the DB.
Balaji QA
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Conversion script in Cassandra

I am trying to add UDT bom_object column in my table. bom_object type= list which will replace the old column 'product'. for that i need to write conversion script.I will appreciate Any suggestion or idea. Since i am new to…
JOGO
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Cassandra Clustering order not sorting list

I have a patient table and treatment_patient where pat_id acts as foreign key. I want to execute a query such that the treatment_patient always returns values ordered by pat_id. I tried adding WITH CLUSTERING ORDER BY (patid ASC); at the end but…
VIshu Kamble
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Cassandra multiple nodes in different data centers on same server

Just want to know if I can configure multiple nodes from different data centers on the same physical server. Example - Want to have 2 data centers with 3 nodes each. 1 node from each data center will be on each server. Total of 2 data centers, 6…
Mike De
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Oracle to Apache Cassandra data migration

I am working on an Apache Cassandra data migration. I have couple of tables which I need to move to the Cassandra column family with data - what is the best way to do this? I have seen Apache Sqoop, will it help me? If yes, then what are the steps?
rajeev kumar
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Cassandra upgrade from 2.0 to 2.1 with hsha setting giving outofmemory error

I upgraded cassandra nodes from 2.1.0 to 2.1.1 I have hsha configuration in my cassandra.yaml file after upgrade if I restart the service, ERROR java.lang.OutOfMemoryError: Requested array size exceeds VM limit If i change it to sync (in…
Neha Dave
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