install gem first. Installation command: Gem install cassandra
After the installation is complete, open the IRB of Ruby and start to use Cassandra.Listing 6. Ruby connects to Cassandra and writes and reads data
> Require 'rubygems '> require 'Cassandra' # create a database connection> CDB = Cassandra. new ('keyspace1
reading a copy, you can specify that all copies must be consistent (high consistency), read a copy (high availability), or confirm that the majority of copies are consistent (compromise) by election ). In this way, Cassandra can be applied to scenarios with nodes, network failures, and multiple data centers.
First, we will introduce how to start and configure Cassandra.1. Download
suspended task queue is full, Cassandra will take the current block as a currently blocked, and of course these tasks may eventually be accepted or executed.How to monitor CassandraTo monitor Cassandra, first you need to install the Cloud Insight probe, register your account, copy it with one click:CI_LICENSE_KEY= bash -c "$(curl -L https://download.oneapm.com/oneapm_ci_agent/install_agent.sh)" After succ
Tags: Cassandra two ways to log in Cassandra-cli/csqlsh(1) cassandra-cliThe CASSADNRA-CLI command is discarded in cassandra2.2, and later login access Cassandra can be used Cqlsh[Email protected] cassandra]$ cassandra-cli-h 172.16
Similar to SQL (Structured Query Language), Cassandra will also provide Cassandra query statements (cql) in future releases ).
For example, if the keyspace name is websiteks and cql is used:
Use websiteks;
Query the value of column family with standard1 and key as K:
Select from standard1 where key = "K ";
Update the value of column family to standard1, key to k, and column to
Cluster machine:
1. Windows 7 10.202.92.124 [seed]
2. Windows Server 2008 R2 Enterprise 10.202.92.93
Zero: prerequisites1. Set JDK and Google or easy.2. download the latest Apache-Cassandra. This article uses APACHE-Cassandra-1.2.0 version, download the official website is: http://cassandra.apache.org
I. Configuration Original configuration in CONF/Cassandra
Https://wiki.fourkitchens.com/display/PF/Using+Cassandra+with+PHP
1. Down the thrift code.
Http://incubator.apache.org/thrift/download/
2. Building the PHP Client2.1 configure and build thrift.
./Configuremake
2.2 build the PHP thrift interface for Cassandra:
./Compiler/CPP/thrift-gen PHP ../path-to-Cassandra/interface/
Recently the inexplicable Cassandra can't be started, and after checking the log in log, I finally found the reason. (The logon log is located in the CASSANDRA folder of the $cassandra_home sibling directory)Look at the error report first.ERROR [Sstablebatchopen:2-one-all:: 933 Fileutils.java:447"stop"0 chunks Encountered: [Email protected]Sstable Open failed, because sstable damaged, look at the foreigner
Recently NoSQL compare fire, I also recently toss a hand; Cassandra0.6.3 if just let it run, then directly ignore the following content. I want to see the source code, so there are the following steps.
1, download src;
2, set Java_home
Configure environment variables under Linux system, I add under/etc/profile:
java_home=/usr/lib/jvm/java-6-sun-1.6.0.19
Path= $JAVA _home/bin: $PATH
Classpath=.: $JAVA _home/lib/dt.jar: $JAVA _home/lib/tools.jar
Export
1. Basic Configuration
First, you need to prepare 3 or more computers. The following assumes 3 computers running a Linux operating system with IP addresses of 192.168.0.100, 192.168.0.101, and 192.168.0.102. The system needs to install the Java runtime environment and then download the 0.7 version of the Cassandra binary release package here.
Select one of the machines to start the configuration, first
Start today by learning the Cassandra of the NoSQL database, documenting the process, and also for interested reference.Brief introductionApache Cassandra is an open source distributed NoSQL database system. Originally created by Facebook, Google BigTable's data model integrates with Amazon Dynamo's fully distributed architecture.Document:Cassandra's official documents are mainly Wiki:http://wiki.apache.org
We now have a three-node Cassandra cluster on 192.168.129.34, 192.168.129.35, 192.168.129.39, because we have 7199 ports on each node (JMX monitor Port), So we can use Jconsole to detect the state of these nodes.
Open the Jconsole under%java_home%/bin, enter 192.168.129.34:7199 in the remote connection, and then click Connect:
More Wonderful content: http://www.bianceng.cnhttp://www.bianceng.cn/database/extra/
So you can go to the Jconsole interf
Tags: start scala understanding operation NULL Conditional Protocol Note log fileIn a previous article, "Introduction to Graphical Database Neo4j", we introduced a very popular method of using graphical database neo4j. In this article, we'll simply introduce another type of NoSQL database--cassandra. The reason for exposure to Cassandra is the same as that of contact neo4j: Our products need to be able to r
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
With the development of Internet technology, the requirement of data storage is high, there is high demand in capacity, security, backup, high availability and so on, the popular relational database has SQL Server, MySQL, Orcale, etc., non-relational database has key, value type Redis , Memcached, the document database has MongoDB, CouchDB, and the list of types of HBase, Cassandra. A wide variety of knowledge points to learn more and more, we in the
A while ago, Cassandra-0.7.0-beta1 was released, todayCodeAfter a rough look, we found that the main changes were as follows:
1. The keyspace and columnfamily in the data model can be dynamically modified:
In earlier versions, If You Want To modify keyspace and columnfamily in Cassandra, you must stop Cassandra, modify the configuration file, and then rest
Learn about Linux, please refer to the book "Linux should Learn"The Apache Cassandra database has recently attracted a lot of interest, mainly due to the availability and performance requirements of modern cloud-based software. So, what is Apache Cassandra? It is a distributed online transaction processing (OLTP) datab
1. Background
Cassandra uses a Distributed Hash table (DHT) to determine the nodes that store a data object. In the DHT, the nodes and Data Objects responsible for storage are allocated with a token. Token can only be set within a certain range. For example, if MD5 is used as the token, the value range is [0, 2 ^ 128-1]. Storage nodes and objects are arranged into a ring based on the token size, that is, the largest token is followed by the smallest
1, Cassandra IntroductionApache Cassandra is a set of open source distributed key-value storage systems. It was originally developed by Facebook to store particularly large data. Cassandra is not a database, it is a mixed non-relational database, similar to Google's BigTable. This article mainly from the following five aspects to introduce CASSANDRA:CASSANDRA dat
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