Here we start to use Java to operate the Cassandra database, not limited to client operations. For operations on the client Cassandra-CLI and nodetool, you can use the help command on the command line to get a lot of help.
I am using thrift to operate databases. This is a relatively low-level method that uses the most basic API directly. Although there are more advanced methods to operate, it is still neces
Summary
This paper mainly introduces the index in Cassandra, materialized view, some knowledge points need to have a basic understanding of Cassandra to understand. such as how the data is distributed in the Cassandra node. If there is something you don't understand, you can read the article before this column. or send me an email and discuss cnstonefang@gmail.c
Spring data gives us a lot of access to the data, and then we combine Spring-data-cassandra to see how to quickly implement access to Cassandra data.Of course, the Official Handbook is a must-see, official 1.2.0RELEASE document. Prepare for the basic use of dependency:SETP1: Defines a domain model (called an entity in JPA), such as Person:Import Org.springframework.data.cassandra.mapping.PrimaryKey;Import o
transferred from: Http://www.infoq.com/cn/articles/best-practice-of-cassandra-data-model-designdon't put Cassandra modelthink of it as a relational databaseTableInstead, think of it as an orderly map structure.For a novice, the following relational database terminology is often mapped to the Cassandra modelThis comparison can help us to transition from a relation
1. Inverse entropyThe Cassandra database draws on Amazon's Dynamo in a distributed architecture, and references Google's bigtable on the data storage model. So in the data consistency and dynamo and BigTable have a deep connection, inverse entropy mechanism is a manifestation of this connection. inverse entropy, like the gossip protocol, is an algorithm based on infectious disease theory, which is mainly used to ensure that data on different n
Recently installed Cassandra to the product server, a lot of things require a lot of strict, such as Perf used in the JMX, previously as long as the IP can access, but the product server is not, so there is a security risk, nodetool-h host can add and delete nodes. So the thing to talk about today is Cassandra JMX's authorization and access control.
Here is the first, the most common use of passwords and a
A preface In the previous article, I briefly described the installation and launch of Cassandra on the Windows platform, and described the basic data model of Cassandra in a bottom-up perspective. Before I learn a new thing, I think the best way to do this is to get to the macro and start with the details. This article analyzes the Cassandra data model from a to
includes Spark, Mesos, Akka, Cassandra, and Kafka, with the following features:
Contains lightweight toolkits that are widely used in big data processing scenarios
Powerful community support with open source software that is well-tested and widely used
Ensures scalability and data backup at low latency.
A unified cluster management platform to manage diverse, different load applications.
When deploying specific applications,
Spring data brings us a lot of convenience in accessing the data, and then we'll combine Spring-data-cassandra to see how to quickly access the Cassandra data.
Of course, the Official Handbook is sure to look at the official 1.2.0RELEASE document. Prepare the dependency for basic use:
SETP1: Define a domain model (called an entity in JPA), such as Person:
Import Org.springframework.data.cassandra.mapping.
This article is the first of the Cassandra Data Model design (all two), which contains some of the practices ebay uses to design the Cassandra data model. Some of the best practices we learned through our communities, some of which are new to us, and some that are still controversial, may benefit from further practice.
In this article, I will explain some basic practices as well as a detailed example. Even
Kairosdb(1) To/conf directory, find kairosdb.properties, modify Datastore to Cassandra(2) Setting the connection mode of Cassandra(3) Set user name password4. Start: Go to the/bin directory and run directly./kairosdb.sh Start, finally see KAIROSDB service started such a word, OK 172.16.101.25:8080 kairosdb client Cassandra Modify
About the installation of Cassandra database, in fact, the Apache official website has a detailed introduction: http://wiki.apache.org/cassandra/GettingStarted. Of course, for the convenience of students who do not want to see English, the following is probably introduced:Pre-work: Make sure your Mac has a JDK installed (the latest Mac system should have JDK, so the problem should be small, java-version can
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Advantages and disadvantages of Cassandra
Reprinted: http://hi.baidu.com/qnuth/blog/item/8720811ff79bca11314e15da.html
Because the data models of hbase and Cassandra are very similar, we will not compare the data models between them here. Next we will mainly compare the data consistency and multi-Copy Replication features of both parties.
Hbase
Hbase ensures write consistency. When
Objective:
Read a lot of Cassandra cluster configuration data, a lot of information will always make people foggy feeling ah, had to write an article about the basic implementation of Cassandra cluster configuration.
Download Cassandra
Here: http://cassandra.apache.org/download/Select a suitable version, more than 0.8 version is more reliable, the current maximum
SummaryThis article mainly introduces Cassandra Threading technology, the implementation of Cassandra is Java-based, so threading technology is also used by the JDK package provided by the threading class. Cassandra is a distributed database, and the entire concurrency architecture is based on a phased event-driven architecture (staged Envent-driven architecture)
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Start cassandra
New sstable files need to be written to disk
In "how to install and configure Cassandra", we can configure the data storage location in datafiledirectories.
After Cassandra is started, the data inserted into it will be placed in the directory of datafiledirectories,
There are two column families, standra
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No Query Language
No reference integrity
Secondary Index
Sorting becomes a design decision
Anti-paradigm
Cassandra has many different models and query methods than RDBMS. It is important to remember these differences.
No Query Language
SQL is a standard query language for relational databases, but Cassandra does not have a query language. But
How to Create a secondary index for a row column is a common question in Cassandra. The following post describes an implementation method. Of course, this is not the only method. For experienced Cassandra users, this post should be of interest. The implementation method described here does not need super column at all, so there will be no complexity and constraints brought about by the use of super column.
Cassandra clusters have no central nodes and each node has the same status. They maintain the cluster status through a protocol called gossip. Through gossip, each node can know which nodes are included in the cluster and their statuses, which enables any node in the Cassandra cluster to route any key, unavailability of any node will not cause disastrous consequences.I. Gossip algorithm background
The gossi
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