Questions tagged [cassandra]

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.

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Python version issue on Cassandra 3.11.2

Searching around I found a lot of thread about this problem (coming from 2012) but I can't find an official solution: running cqlsh.bat File "C:\apache-cassandra-3.11.2\bin\\cqlsh.py", line 146 ...
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Cassandra multi data centre cluster configuration [closed]

We are decided to use "cassandra" as a database and now want to go with cluster with two datacenters DC1 & DC2. This DC2 is for backup purpose and it is replica of DC1. Initially we are expecting ...
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How to choose database for scalable chat systems? [closed]

I have made a chat application where for now I am storing complete history of chat of all the users. I am using django as backend and postgres as the database. I am nearing 100k daily active users ...
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4k views

how to import a huge csv file into Cassandra?

I am trying to import a csv file into Cassandra which is very long. These are food products: ingredients, nutrition, labels... It comes from Open Food Data. List information on food products: ...
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Can Cassandra prevent TTL from updating on upsert of table

I have a Cassandra table that is like this... CREATE TABLE IF NOT EXISTS analytics.data( id double, data text, PRIMARY KEY(id, data) ) WITH default_time_to_live = 120 AND gc_grace_seconds ...
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What is the best compaction strategy for overwritable/mutable/upsert-able data?

Suppose I have a Cassandra table like this: CREATE TABLE keyspace.last_modified ( category text, subcategory text, id text, created_at bigint, PRIMARY KEY ((category, subcategory, ...
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20 views

Stopping N number of nodes of a Cassandra cluster running on a single machine using bash script

I have set up a Multi-Node cassandra (3.11) cluster (with N nodes) in a single Ubuntu machine. I have written a bash script which Creates N copies of conf folder Configures the cassandra yaml file ...
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108 views

Binary storage in Cassandra, HBase

I am looking at some implementations of Cassandra and HBase for medium-sized data sets (~1M resources) to be exposed to clients as graphs (via e.g. Tinkerpop). I would also like to store binaries in ...
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179 views

Cassandra multi-DC:write on LOCAL and read from any DC

We use a multi-data center (DC) cassandra cluster. During write on to the cluster, I want only LOCAL DC to perform writes on its nodes as we are already routing the write requests to the desired DC ...
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232 views

Copy/move data from one cassandra server to another

I'm in the midst of replacing a kubernetes stack (to more specific: moving it from a locally hosted cluster to an AKS cluster in Azure), and as a result have to re-create all of my services, including ...
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156 views

Cassandra nodes are not equal

We have two nodes. Node1 was down for a long time. During this time Node2 raised 1 TB capacity when Node1 has 100 GB. We tried to repair Node1 with nodetool repair but nothing changed. After that we ...
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335 views

Cassandra querying without full primary key

As far as I understand there are no secondary indices with multiple columns, only single columns. So how do I solve the index problem I'm having? This is my table: CREATE TABLE IF NOT EXISTS logstv....
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153 views

how to disable delete in replication Cassandra datastax

my previous scenario i used Sql server one instance in amazon for live and the second in local network for archiving by disable delete in replication can i do this in Cassandra or what best ...
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401 views

Correct way to perform backup of Cassandra/Scylladb

What's the correct(advisable) method to backup a cassandra or scylladb so that we can restore it on development environment with ease?
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Allocate space in Cassandra

We run a Cassandra cluster with 2 DC, 3 nodes each (2 RF). The state of the cluster is quite bad (never repaired) and the disks were getting full so we added additional nodes which after the bootstrap ...
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225 views

Cassandra in a Public Cloud - Which Snitch?

I am planning on deploying Cassandra in a public cloud (like Amazon AWS). The cluster will span multiple zones and regions. The cluster will also require logical DC separation within a given region. ...
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263 views

Cassandra query performs differently at different times

I am using apache-cassandra-2.0.12 in production, with network topology strategy and ReplicationFactor : 3 in a cluster with 2 DC’s each contains 4 nodes While analyzing the response time for the ...
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357 views

What may be the consequences of deleting the system keyspace?

I have a Cassandra cluster composed of 2 nodes. One node could not start Cassandra yesterday. I deleted the system keyspace directory and I started the node again. The node is running after system ...
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Does Cassandra CQL provide a command to generate an execution plan?

In Oracle and other DBs you can generate an execution plan for SQL. Is this possible for Cassandra? I want to determine if it is possible to measure the relative complexity of several CQL statements ...
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27 views

User Grant in cassandra DB

I would like a user abc to access only a single keyspace and no other keyspaces in the Database. How can I achieve so?
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Why getting Error accessing Cassandra with DataStax ODBC Driver?

We are using Cassandra 2.2.11, and trying to configure DataStax ODBC driver. We are getting the following error message: SQLSTATE: HY000[DataStax][CassandraODBC] (10) Error while executing a query ...
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8 views

Show cassandra help documentation in terminal instead of browser

I've just started playing around with Cassandra through the cqlsh cli. When using the help command for the topics the documentation opens in the browser. Is there a way to show the documentation in ...
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Cassandra pool warning displaying continuously

I am using the Cassandra driver for python in Spyder. I am trying to fetch some data from Cassandra table. Here is my code: from cassandra.cluster import Cluster cluster=Cluster(['some_ip']) session=...
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Is it safe to add a new node to a Cassandra cluster while a repair is running?

I'm getting ready to expand an existing Cassandra cluster. I have repairs scheduled to run on a reoccurring basis. Do I need to disable repairs when adding a new node to a cluster, or can I ...
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38 views

Hints gc_grace and expirations

Have 3 node cluster. RF=3. Table with gc_grace_seconds = 120 secs. max_hints duration as default at 3 hours. inserted a row nodetool flush on all the 3 nodes bring down node 3 delete the inserted ...
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Cassandra Cluster storage

I want to try out Cassandra Cluster. My main question is about scalability. Every node in a Cassandra cluster has the same copy of data. So when I have in total 1 TB and have 5 nodes -> 5TB. This at ...
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Is there a way to change the compaction throughput via startup options in Cassandra?

We are currently running a Cassandra cluster in K8S containers as Stateful sets. We're considering exposing the config file but we would like to know if perhaps we can provide this value as a startup ...
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75 views

Apache Cassandra INSERT-only permissions

Looking at the Cassandra documentation, it appears that the smallest write-only permission on a table you can grant is MODIFY, which includes UPDATE, DELETE and TRUNCATE. Is there a proper way to ...
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20 views

cassandra nodes have diff value

I have 3 node cluster, problem is that for some rows , updatetime column have different value on 3 node: like : 1st node : updated_on | 2018-08-22 17:01:30+0530 2nd node : updated_on ...
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Error on cassandra-3.11.3-1.noarch centos7

I've a cluster consisting of 5 cassandra nodes. The cassandra version used is cassandra-3.11.3-1.noarch The keyspace strategy and is defined as follows: CREATE KEYSPACE my_keyspace WITH ...
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2answers
161 views

Handling read conflict in cassandra?

Say we have three nodes(simple replica no sharding) i.e. N1,N2 and N3 with replication factor as 3. As read and write request can go to any node, Say Request write request(to update the same ...
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209 views

How to deal with unbounded growth in cassandra shards

Let's say we have a website like youtube where we have a comment session per e video. Users want to be able to comment and to see the comments made by other users by comment creation time. This is ...
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Data replication in Cassandra

We have a 5 node cluster in Cassandra in which we have created a keyspace with RF=3. After creating a column-family(table) when we insert the data into the same, it is getting replicated in all the ...
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Kill client connection to Cassandra instance

Not able to go to find any documentation on how to kill a client connection to remote Cassandra I will instance .. as a DBA at the server end? Seems like an easy task but why no mention of this in ...
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OpsCenter missing in Datastax Cassandra for Windows

Following this guide within the Cassandra installer I should get OpsCenter too. But this screenshot https://www.datastax.com/wp-content/uploads/2012/01/dsc-win4.jpg doesn't match the current release (...
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22 views

SQL Join vs NoSQL Wide column

If we need to have 2 tables, one storing the author info(author_info), & another storing all the books info(book_info). author_info has authorId as it's primary key, whereas the book_info table ...
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612 views

dropping a table does not delete the directories on the disk

I am just testing the drop table command in Cassandra 3.11. The sequence is as follows: Load data worth 10gb drop the table on the node, nodetool flush nodetool clearsnapshot nodetool cleanup ...
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How these conflicting scenarios will work in cassandra when one of the mode crashes?

Say we have two nodes(simple replica no sharding) i.e. N1,N2 with replication factor as 2. I am using default Read and write consistency levels i.e. R and W are 1 which means it will read/write from/...
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47 views

Replica model in Cassandra vs Mongo?

Say in Mongo we have one primary and two replica node(simple replica no sharding). Read and write request will be handled only primary node and replica will just backup the data in case of failover. ...
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675 views

Mongo CP, Cassandra AP?

I have read lot of articles on net but still confused why Mongo CP, Cassandra AP, RDBMS CA ? Will explain my understanding and query along with that . Mongo Consider a scenario where I have ...
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2k views

Cassandra - High Number of Dropped Mutations (Specific Table on a specific Node in the cluster)

History Leading to this issue: My Compression strategy in Production was LZ4 Compression. But I modified it to Deflate For compression change, we had to use nodetool Upgradesstables to forcefully ...
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150 views

MyRocks vs Cassandra data size

Both MyRocks (MySql) and Cassandra uses LSM architecture to store their data. So I have populated around 5 million rows in MySql with MyRocks as storage engine and also in Cassandra. In Cassandra it ...
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49 views

best way to retrieve data using multiple parameters in Cassandra?

I have created a table that contains the userid, the content that they posted on their newsfeed, the date of when they posted it, and a primary key(I am using nodejs) my first shot at retrieving the ...
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32 views

What things we should consider when configuring Cassandra Cluster?

I'm new to Cassandra, so wanted to understand what basic things we should consider when are we going to configure Cassandra cluster in on or multiple database centers? Thanks!
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1answer
446 views

Cassandra backup from all nodes or just one?

Cassandra is a distributed database, where each node is in sync with the other nodes from the same ring/cluster. When taking backups based on a snapshot, do I need to back up each node individually ...
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1answer
509 views

Cassandra writing (too?) large partitions

I have a Cassandra cluster running for quite some time now (months) and, as expected, it has been consuming large quantities of data every day. In the past few days the cluster has been having ...
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36 views

Cassandra - reinserting a node

I had to remove a cassandra dead node on a hurry (because an important script with a truncate query wouldn't work due to consistency level reasons -- any thoughts on that would be nice too). Anyway, ...
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49 views

Can I use result of one query inside other query in Cassandra

I need to delete all rows with given clustering column value. I don't have partition key so I don't have complete primary key. To delete record from Cassandra table we need to provide specific ...
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152 views

user based trace enable in Cassandra

i have created user and role in Cassandra and tracing is enabled. but sessions and event table does not capture user info. below tables gives information about what query has been executed and from ...
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70 views

password expire duration and maximum invalid login attempts

how to set password expire duration and maximum invalid login attempts for user under Cassandra DB ? for example user test tried to login with incorrect password 5 times , that should should get ...