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@compdist-blog
Cassandra en la VM
Tutoriales de c贸mo montarla:
Official Package To Install On Debian
Installing聽DataStax Community聽on Debian-based systems
En la que tenemos nosotros, Cassandra est谩 instalado en /etc/cassandra (hay que volver atr谩s en los directorios un par de veces)
[multi-node clusters]
Es necesario descargar Cassandra Cluster Manager聽SUBIDO EN GITHUB
Requirements聽
Hemos descargado los m谩s recientes de todo
A working python installation (tested to work with python 2.7).
pyYAML (http://pyyaml.org/聽descarga y descomprime y te vas a la carpeta de descompresi贸n --聽sudo easy_install pyYaml)
o bien聽sudo python setup.py install聽
six (https://pypi.python.org/pypi/six聽descarga y descomprime y te vas a la carpeta de descompresi贸n聽--聽sudo easy_install six)
o bien聽sudo python setup.py install (no, no es un error)
ant (http://ant.apache.org/, on Mac OS X,聽brew install ant)
psutil (https://pypi.python.org/pypi/psutil)
Java (which version depends on the version of Cassandra you plan to use. If unsure, use Java 7 as it is known to work with current versions of Cassandra).
Problemas:聽easy_install聽no es un comando v谩lido, en askubuntu dan esta soluci贸n:
sudo apt-get update sudo apt-get upgrade sudo apt-get install python-setuptools
Despu茅s de todo esto ya podemos usar el CCM:
Installation
ccm uses python distutils so from the source directory run:
sudo ./setup.py install
Usage
Let's say you wanted to fire up a 3 node Cassandra cluster.
Short version
ccm create test -v 2.0.5 -n 3 -s
You will of course want to replace聽2.0.5聽by whichever version of Cassandra you want to test.
El 3 marca que se est谩m creando 3 nodos en el cluster (comprobar que es esa versi贸n de Cassandra la que tenemos instalada)
Para mejor entendimiento de lo que se hace y configurar personalmente las opciones mejor seguir la versi贸n larga:
Longer version
ccm works from a Cassandra source tree (not the jars). There are two ways to tell ccm how to find the sources:
If you have downloaded聽and聽compiled Cassandra sources, you can ask ccm to use those by initiating a new cluster with:
ccm create test --install-dir=<path/to/cassandra-sources>
or, from that source tree directory, simply
ccm create test
You can ask ccm to use a released version of Cassandra. For instance to use Cassandra 2.0.5, run
ccm create test -v 2.0.5
ccm will download the source (from聽http://archive.apache.org/dist/cassandra), compile it, and set the new cluster to use it. This means that this command can take a few minutes the first time you create a cluster for a given version. ccm saves the compiled source in聽~/.ccm/repository/, so creating a cluster for that version will be much faster the second time you run it (note however that if you create a lot of clusters with different versions, this will take up disk space).
Once the cluster is created, you can populate it (with 3 nodes) and start all the nodes with:
ccm populate -n 3 ccm start
That will start 3 nodes on IP 127.0.0.[1, 2, 3] on port 9160 for thrift, port 7000 for the internal cluster communication and ports 7100, 7200 and 7300 for JMX. You can check that the cluster is correctly set up with
ccm node1 ring
You can then bootstrap a 4th node with
ccm add node4 -i 127.0.0.4 -j 7400 -b
(populate is just a shortcut for adding multiple nodes initially)
ccm provides a number of conveniences, like flushing all of the nodes of the cluster:
ccm flush
or only one node:
ccm node2 flush
You can also easily look at the log file of a given node with:
ccm node1 showlog
Finally, you can get rid of the whole cluster (which will stop the node and remove all the data) with
ccm remove
The list of other provided commands is available through
ccm
Each command is then documented through the聽-h聽(or聽--help) flag. For instance聽ccm add -hdescribes the options for聽ccm add.
TO-DO
Multi-node Cluster
Bulk-data load
(si hay tiempo) MySQL migration to Cassandra
Tutoriales de Cassandra: A脩ADIDOS TUTORIALES DE CLUSTERS
C*ollege Credit: Creating Your First App in Java with Cassandra聽and in video
Introduciton to Apache Cassandra for Java Developers (JavaOne)
CLUSTERS
Writing your first client聽(b谩sicamente lo que ya hicimos en el tutorial de Java I y II)
Introduction to Cassandra Clusters. (planet cassandra)聽
Initializing a multiple node cluster (single data center)
How To Configure a Multi-Node Cluster with Cassandra on a Ubuntu VPS
cassandra cluster setup with multiple nodes on single machine (youtube)
Cassandra Administration Tutorial: Building a Cluster of Multiple Nodes | packtpub.com (youtube)
How to set up a 4 node Cassandra cluster in under 2 minutes (screenr)
Running Cassandra in a Multi-node Cluster
BULK-DATA
Bulk-Loading Data to Cassandra with sstable or JMX
Cassandra bulk loader (datastax)
Using the Cassandra Bulk Loader
yukim/cassandra-bulkload-example聽(github)
Tutoriales de Cassandra: A脩ADIDOS TUTORIALES DE CLUSTERS
C*ollege Credit: Creating Your First App in Java with Cassandra聽and in video
Introduciton to Apache Cassandra for Java Developers (JavaOne)
CLUSTERS
Writing your first client聽(b谩sicamente lo que ya hicimos en el tutorial de Java I y II)
Introduction to Cassandra Clusters. (planet cassandra)聽
Initializing a multiple node cluster (single data center)
How To Configure a Multi-Node Cluster with Cassandra on a Ubuntu VPS
cassandra cluster setup with multiple nodes on single machine (youtube)
Cassandra Administration Tutorial: Building a Cluster of Multiple Nodes | packtpub.com (youtube)
How to set up a 4 node Cassandra cluster in under 2 minutes (screenr)
Running Cassandra in a Multi-node Cluster
M谩quina Virtual con Cassandra y Eclipse
Setup por Dani, es necesario tener la aceleraci贸n virtual (VT-x) activada para que funcione, en caso de no tenerla se puede activar a trav茅s de las BIOS, en Windows, para llegar a la BIOS nada m谩s encender el ordenador pulsa DEL o F2 8antes de llegar al login de usuario).
La m谩quina es un Debian normal (64 bits) con Cassandra instalado, podemos tener las dos consolas igual que antes, la consola normal de Debian como la de root y la de CQL simplemente usando el commando.
cqlsh
Para escribir/compilar/correr el c贸digo usaremos eclipse, importamos las librer铆as/drivers de cassandra y al ejecutar el c贸digo desde el propio eclipse ya est谩 funcionando con Cassandra.
Driver java 2.0.2
Hemos descargado el driver a Window y lo hemos subido Cassandra a trav茅s del cofmando curl con el programa HFS.聽
Una vez en cassandra lo hemos descomprimido 聽con el comando: tar xvf cassandra-java-driver-2.0.2.tar.gz
Es necesarrio tener en el classpath un log para java. Esto lo sabemos por los warnings que nos han saltado. Hay que a帽adir聽log.properties
Warnings:
"WARN no appenders could be found for logger (com.datastax.driver.core.Cluster)
WARN Please initialize the log4j system properly
WARN see http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info."
[Java y Cassandra] Problemas
Problema surgido mientras intentamos seguir el tutorial:聽Getting Started with Apache Cassandra and Java (Part I)
Problema: 驴C贸mo compilar y correr una aplicai贸n de Java?
En clase el jueves pasado: Compilamos con Eclipse y con HFS hemos conseguido que el archivo .class apareciese en Cassandra pero el comando de correr el c贸digo daba error, subimos un .jar en su lugar pero tampoco conseguimos que funcionase. (Eclipse no corr铆a el programa, saltaba error)
Ahora: intentamos subir el .java a Cassandra as铆 como el driver de java necesario y correr el commando de compilaci贸n, mensaje de error:
聽bash:聽javac:聽command聽not聽found聽
驴Es que no es Cassandra quien tiene que compilar y correr el c贸digo? Entonces, 驴c贸mo y d贸nde se corre el c贸digo?
驴Posible soluci贸n?: Cassandra + Eclipse + Maven
SOLUCI脫N
Subir el聽.class a Cassandra con HFS y ejecutamos el comando para ejecutar la app tal cual desde VMware.
java -classpath cassandra-java-driver-2.0.2/*:cassandra-java-driver-2.0.2/lib/*:. GettingStarted
No se muestra nada por pantalla, hay que comprobar en la terminal de CQL
[Java y Cassandra] Problemas
Problema surgido mientras intentamos seguir el tutorial:聽Getting Started with Apache Cassandra and Java (Part I)
Problema: 驴C贸mo compilar y correr una aplicai贸n de Java?
En clase el jueves pasado: Compilamos con Eclipse y con HFS hemos conseguido que el archivo .class apareciese en Cassandra pero el comando de correr el c贸digo daba error, subimos un .jar en su lugar pero tampoco conseguimos que funcionase. (Eclipse no corr铆a el programa, saltaba error)
Ahora: intentamos subir el .java a Cassandra as铆 como el driver de java necesario y correr el commando de compilaci贸n, mensaje de error:
聽bash:聽javac:聽command聽not聽found聽
驴Es que no es Cassandra quien tiene que compilar y correr el c贸digo? Entonces, 驴c贸mo y d贸nde se corre el c贸digo?
驴Posible soluci贸n?: Cassandra + Eclipse + Maven
Tutoriales de Cassandra:
C*ollege Credit: Creating Your First App in Java with Cassandra聽and in video
Introduciton to Apache Cassandra for Java Developers (JavaOne)
Setup server and acces form Cassandra
First we download the HFS.exe. It's a program that creates a server to which we will upload data and connect from Cassandra:
To connect from Cassandra we use the next command in the root console (alt+F2)
curl https://163.117.65.100/nombredelarchivo -o nombredelarchivo
[Getting Started with Apache Cassandra and Java (Part I)]
source: http://planetcassandra.org/getting-started-with-apache-cassandra-and-java/
You need to download this driver.
Consola de VMware_ ALT + F2 para poder escribir
para 聽poder trabajar en java, sompilaremos las clases en nuestra cuenta de linux, en VMware ponemos:
sftp [usuariodetelematica]@monitor01.lab.it.uc3m.es
[Developer tutorial Part 3]
ALTER聽TABLE聽videos聽WITH聽compression聽=聽{聽'sstable_compres
sion'聽:聽''聽};
Nota: el "</strong>" es una etiqueta HTML que se ha colado en el comando, por lo que hay que quitarlo para poder introducir ese mismo comando en cassandra.
[Developer tutorial Part2] Nodetool Utility
Lets take a look at the health of your instance. From the command prompt in the root console, type:
聽 # nodetool status
聽 From here we can see that the instance (node) is up and in a normal running state. Because it is not part of a cluster, it effectively owns 100% of the data.
If we type:
聽 # nodetool info
聽 We get more indepth information on the configuration of the node, including uptime, heap size, and gossip and thrift activity. Using nodetool tpstats (below) displays the number of active, pending and completed tasks for each of the thread pools that Cassandra uses for each stage of operation.
聽 # nodetool tpstats
[Developer tutorial Part1] Configuration Directives
3 archivos principales de configuraci贸n:
Lets take a look at the three main configuration files for Apache Cassandra. To view the configuration files, from the root console type the following:
# cd /etc/cassandra
# ls聽
Now we will look at each in more detail
cassandra.yaml
cassandra-env.sh
log4j-server.properties
The聽cassandra.yaml聽file is the main configuration file for Cassandra. After changing properties in this file, you must restart your instance for the changes to take effect. In this file, you can find properties to tune performance and system resource utilization (memory, disk I/O, CPU, etc.) for reads and writes. It also contains node and cluster initialization properties.
The聽cassandra-env.sh聽file in part controls the environment settings for Cassandra. It has heap sizing options(MAX_HEAP_SIZE, HEAP_NEWSIZE) and JMX options which can be monitored or manipulated, like nodetool, an JMX-compliment management tool. By default, JMX listens on port 7199 without authentication.
聽If you are interested in configuring logging, you should look at the the聽log4j-server.properties聽file. In some situations, the output from nodetool utility is not enough to diagnose an issue. If you find that you need more information on runtime behavior of your instance, you can increase the logging levels to get more diagnostic information on specific portions of the system.
Podemos ver la informaci贸n de cada archivo en la consola de root con el comando:
聽# more cassandra.yaml
y podemos cambiarlos en un editor de texto.
para m谩s informaci贸n en los archivos de configuraci贸n:
http://wiki.apache.org/cassandra/StorageConfiguration
Ejemplo:
"Where are my keyspaces?"
LiveSchemaUpdates. You can load the schema once by using:
bin/schematool HOST PORT import
Si Cassandra no reconoce ciertos caracteres...
Mirar el c贸digo ascii de dicho caracter:
Escribir {聽ALT+123
Escribir }聽ALT+125
@ = ALT + 64