cassandra certification - Wikitechy

What is the use of Cassandra database ?

Editor — Tue, 13 Jul 2021 05:36:30 +0000

Apache Cassandra is a high-performance provides database to manage large number of data among many commodity servers and then it is highly scalable.
It is a type of NoSQL database.
Apache Cassandra can be used for different applications.

In activity-tracking and monitoring applications:

Numerous entertainment and media organisations use Cassandra to observe user activity based on movies, music, albums, artists or other parameters.

In heavy write systems or in time-series-based applications:

Cassandra is best for heavy write systems .For example, data is logged for each request based on hits in web analytics, by type of browser, traffic sources, position, character, technology, tools, etc.

In social media analytics:

Cassandra is used by many social media providers to recognize the data and gives recommendations to their users.

In product catalogues and retail applications:

A very popular use case of Cassandra is to show fast product catalog inputs and lookup, and in retail applications.

Messaging:

Cassandra serves as the database backbone for countless mobile phone and message providers applications.

Apache Cassandra is a high-performance provides database to manage large number of data among many commodity servers and then it is highly scalable.

Editor — Tue, 13 Jul 2021 05:12:36 +0000

The four components of the Cassandra Coefficient are
1. The warning, the threat or risk in question,
2. the decision makers or audience who must react,
3. The predictor or possible Cassandra, and
4. The critics who disparage or reject the warning.

The Cassandra coefficient is the framework and it offered as a tool and all decision-makers to separate a legitimate warning from a Chicken Little.

There is a lot of commonality amongst actual Cassandras.

Editor — Tue, 13 Jul 2021 04:49:22 +0000

Seeds are used to discover the cluster in the start up period.
The seed node designation has no purpose other than bootstrapping the gossip process for new nodes joining the cluster.
Seed nodes could not be a single point of failure, nor they have do any other purpose in cluster operations except the bootstrapping of nodes.
In cluster formation, nodes are verify “join” and each other.
However, they do not join any node which respects the protocol.Risks:old partitioned replicas, different clusters, even malicious nodes, so on. So a cluster can be defined by some starting nodes contain at clear addresses and it can be reference for that cluster for any new nodes to join in trust-table way.
After some time the seed nodes can go away, then the cluster will keep on.

Editor — Tue, 13 Jul 2021 04:45:53 +0000

Amazon’s dynamo and Prashant malik are written by Avinash Lakshman at first succeed Cassandra at Facebook to capable the Facebook inbox search purpose.
In July 2008,Facebook published Cassandra as an open-source project on Google code.
In March 2009 it develop an Apache incubator project.
On february 17, 2010 it qualify to a top-ranking project.

Releases after graduation include

Added help for integrated caching, and Apache Hadoop MapReduce distributed 0.6 in Apr 12 2010.
Added secondary indexes and online schema changes distributed 0.7 in Jan 08 2011.
Added the Cassandra Query Language (CQL), self-tuning memTables, and help for zero-downtime upgrades distributed 0.8 in Jun 2 2011.
Added integrated compression, levelled compaction, and improved read-performance distributed 1.0 in Oct 17 2011,
Added self-tuning caches, row-level isolation, and support for mixed ssd/spinning disk deployments distributed 1.1 in Apr 23 2012,
Added clustering among virtual nodes, inter-node communication, atomic batches, and request tracing distributed 1.2 in Jan 2 2013,
Added lightweight transactions (based on the Paxos consensus protocol), triggers, improved compactions distributed 2.0 in Sep 4 2013,
In Sep 10 2014 publish 2.1
In July 20, 2015 publish 2.2
In November 11, 2015 publish 3.0
Monthly publish tick-tock like release model in 3.1 across 3.10. When even-numbered contain both bug fixes and new features while odd-numbered involve bug fixes only.
In June 23, 2017 publish 3.11 as a stable and it distributed series and bug fix from the last tick-tock characteristic publish.