Cassandra¶

synopsis¶

Cassandra est un système distribué de gestion de base de données open source conçu pour gérer de grandes quantités de données sur plusieurs serveurs des produits de base, offrant une haute disponibilité sans point de défaillance unique. Cassandra offre un support robuste pour les clusters couvrant plusieurs datacenters, avec le maître asynchrone moins de réplication permettant des opérations à faible latence pour tous les clients.

Le modèle de données de Cassandra est un magasin de ligne partitionné avec une cohérence accordable. Les lignes sont organisées en tables; le premier composant de la clé primaire d’une table est la clé de la partition; au sein d’une partition, les rangées sont groupées par les autres colonnes de la clé. D’autres colonnes peuvent être indexés séparément de la clé primaire.

Commande Aide¶

Cette commande permet de déterminer l’utilisation d’un module Cassandra. L’utilisateur viendra à savoir sur la manière différente / format à exécuter ce module. Cette commande guide l’utilisateur final de connaître le but de cette commande. Ci-dessous sont donnés la commande et la capture d’écran de la même.

ptconfigure cassandra help

La représentation picturale de la commande ci-dessus est illustré ci-dessous,

kevell@corp:/# ptconfigure cassandra help

******************************


 This command allows you to update Cassandra.

 Cassandra, cassandra

       - install
       Installs the latest version of Cassandra
       example: ptconfigure cassandra install

------------------------------
End Help
******************************

installation¶

Cette commande aide à l’installation de Cassandra dans le système. La commande ci-dessous donnée exécuter le processus d’installation.

ptconfigure cassandra install

La représentation picturale de la commande ci-dessus est illustré ci-dessous,

kevell@corp:/#  ptconfigure cassandra install

Install Cassandra? (Y/N)
Y
*******************************
*        Pharaoh Tools        *
*         Cassandra!        *
*******************************
Creating /tmp/ptconfigure-temp-script-10553509319.sh
chmod 755 /tmp/ptconfigure-temp-script-10553509319.sh 2>/dev/null
Changing /tmp/ptconfigure-temp-script-10553509319.sh Permissions
Executing /tmp/ptconfigure-temp-script-10553509319.sh
gpg: directory `/home/deepak/.gnupg' created
gpg: new configuration file `/home/deepak/.gnupg/gpg.conf' created
gpg: WARNING: options in `/home/deepak/.gnupg/gpg.conf' are not yet active during this run
gpg: keyring `/home/deepak/.gnupg/secring.gpg' created
gpg: keyring `/home/deepak/.gnupg/pubring.gpg' created
gpg: requesting key 8D77295D from hkp server pgp.mit.edu
gpg: /home/deepak/.gnupg/trustdb.gpg: trustdb created
gpg: key 8D77295D: public key "Eric Evans <eevans@sym-link.com>" imported
gpg: no ultimately trusted keys found
gpg: Total number processed: 1
gpg:               imported: 1  (RSA: 1)
gpg: requesting key 2B5C1B00 from hkp server pgp.mit.edu
gpg: key 2B5C1B00: public key "Sylvain Lebresne (pcmanus) <sylvain@datastax.com>" imported
gpg: Total number processed: 1
gpg:               imported: 1  (RSA: 1)
gpg: requesting key 0353B12C from hkp server pgp.mit.edu
gpg: key 0353B12C: public key "T Jake Luciani <jake@apache.org>" imported
gpg: Total number processed: 1
gpg:               imported: 1  (RSA: 1)
W: GPG error: http://packages.elasticsearch.org stable Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY D27D666CD88E42B4
W: GPG error: http://packages.elasticsearch.org stable Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY D27D666CD88E42B4
W: GPG error: http://packages.elasticsearch.org stable Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY D27D666CD88E42B4
E: dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to correct the problem.
deb-src http://www.apache.org/dist/cassandra/debian 21x main
OK
OK
OK
Get:1 http://www.apache.org 21x InRelease [3167 B]
Get:2 http://www.apache.org 21x/main amd64 Packages [696 B]
Ign http://extras.ubuntu.com trusty InRelease
Get:3 http://www.apache.org 21x/main i386 Packages [696 B]
Hit http://extras.ubuntu.com trusty Release.gpg
Hit http://extras.ubuntu.com trusty Release
Hit http://extras.ubuntu.com trusty/main Sources
Ign http://www.apache.org 21x/main Translation-en
Hit http://extras.ubuntu.com trusty/main amd64 Packages
Hit http://extras.ubuntu.com trusty/main i386 Packages
Ign http://extras.ubuntu.com trusty/main Translation-en
Ign http://packages.elasticsearch.org stable InRelease
Ign http://us.archive.ubuntu.com precise InRelease
Hit http://dl.hhvm.com trusty InRelease
Ign http://packages.elasticsearch.org stable InRelease
Hit http://us.archive.ubuntu.com precise Release.gpg
Hit http://dl.hhvm.com trusty/main amd64 Packages
Hit http://us.archive.ubuntu.com precise Release
Ign http://packages.elasticsearch.org stable InRelease
Hit http://dl.hhvm.com trusty/main i386 Packages
Hit http://us.archive.ubuntu.com precise/main amd64 Packages
Get:4 http://packages.elasticsearch.org stable Release.gpg [490 B]
Hit http://us.archive.ubuntu.com precise/universe amd64 Packages
Get:5 http://packages.elasticsearch.org stable Release.gpg [490 B]
Hit http://us.archive.ubuntu.com precise/main i386 Packages
Get:6 http://packages.elasticsearch.org stable Release.gpg [490 B]
Get:7 http://us.archive.ubuntu.com precise/universe i386 Packages [4796 kB]
Hit http://packages.elasticsearch.org stable Release
Ign http://packages.elasticsearch.org stable Release
Ign http://dl.hhvm.com trusty/main Translation-en
Hit http://packages.elasticsearch.org stable Release
Ign http://packages.elasticsearch.org stable Release
Hit http://packages.elasticsearch.org stable Release
Ign http://packages.elasticsearch.org stable Release
Ign http://packages.elasticsearch.org stable/main amd64 Packages/DiffIndex
Ign http://archive.canonical.com trusty InRelease
Ign http://packages.elasticsearch.org stable/main i386 Packages/DiffIndex
Hit http://archive.canonical.com trusty Release.gpg
Ign http://security.ubuntu.com trusty-security InRelease
Hit http://archive.canonical.com trusty Release
Get:8 http://security.ubuntu.com trusty-security Release.gpg [933 B]
Ign http://packages.elasticsearch.org stable/main amd64 Packages/DiffIndex
Hit http://archive.canonical.com trusty/partner Sources
Get:9 http://security.ubuntu.com trusty-security Release [62.0 kB]
Ign http://packages.elasticsearch.org stable/main i386 Packages/DiffIndex
Hit http://archive.canonical.com trusty/partner amd64 Packages
Ign http://packages.elasticsearch.org stable/main amd64 Packages/DiffIndex
Ign http://packages.elasticsearch.org stable/main i386 Packages/DiffIndex
Get:10 http://security.ubuntu.com trusty-security/main Sources [64.8 kB]
Ign http://pkg.jenkins-ci.org binary/ InRelease
Ign http://in.archive.ubuntu.com trusty InRelease
Ign http://in.archive.ubuntu.com trusty-updates InRelease
Ign http://repos.zend.com server InRelease
Hit http://repos.zend.com server Release.gpg
Ign http://in.archive.ubuntu.com trusty-backports InRelease
Hit http://repos.zend.com server Release
Hit http://repos.zend.com server/non-free amd64 Packages
Hit http://repos.zend.com server/non-free i386 Packages
Ign http://apt.newrelic.com newrelic InRelease
Hit http://in.archive.ubuntu.com trusty Release.gpg
Get:11 http://in.archive.ubuntu.com trusty-updates Release.gpg [933 B]
Hit http://archive.canonical.com trusty/partner i386 Packages
Hit http://in.archive.ubuntu.com trusty-backports Release.gpg
Hit http://archive.canonical.com trusty/partner Translation-en
Ign http://ppa.launchpad.net trusty InRelease
Hit http://in.archive.ubuntu.com trusty Release
Get:12 http://in.archive.ubuntu.com trusty-updates Release [62.0 kB]
Ign http://wireframesketcher.com  InRelease
Ign http://repos.zend.com server/non-free Translation-en
Hit http://pkg.jenkins-ci.org binary/ Release.gpg
Get:13 http://security.ubuntu.com trusty-security/restricted Sources [2061 B]
Get:14 http://security.ubuntu.com trusty-security/universe Sources [17.4 kB]
Hit http://apt.newrelic.com newrelic Release.gpg
Ign https://repo.varnish-cache.org precise InRelease
Get:15 http://security.ubuntu.com trusty-security/multiverse Sources [723 B]
Hit http://ppa.launchpad.net trusty Release.gpg
Ign http://packages.dotdeb.org squeeze InRelease
Get:16 http://security.ubuntu.com trusty-security/main amd64 Packages [200 kB]
Hit http://in.archive.ubuntu.com trusty-backports Release
Hit http://packages.dotdeb.org squeeze Release.gpg
Hit http://in.archive.ubuntu.com trusty/main Sources
Hit http://wireframesketcher.com  Release.gpg
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Hit http://packages.dotdeb.org squeeze/all amd64 Packages
Hit http://pkg.jenkins-ci.org binary/ Release
Hit http://in.archive.ubuntu.com trusty/multiverse Sources
Hit http://packages.dotdeb.org squeeze/all i386 Packages
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Hit http://apt.newrelic.com newrelic Release
Hit http://in.archive.ubuntu.com trusty/restricted amd64 Packages
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Hit http://ppa.launchpad.net trusty Release
Get:17 https://repo.varnish-cache.org precise Release.gpg
Hit http://wireframesketcher.com  Release
Hit http://in.archive.ubuntu.com trusty/multiverse amd64 Packages
Hit http://packages.elasticsearch.org stable/main amd64 Packages
Ign http://packages.dotdeb.org squeeze/all Translation-en
Hit http://pkg.jenkins-ci.org binary/ Packages
Hit http://in.archive.ubuntu.com trusty/main i386 Packages
Hit http://packages.elasticsearch.org stable/main i386 Packages
Hit http://in.archive.ubuntu.com trusty/restricted i386 Packages
Get:18 https://repo.varnish-cache.org precise Release
Ign http://packages.elasticsearch.org stable/main Translation-en
Get:19 https://repo.varnish-cache.org precise/varnish-4.0 amd64 Packages
Hit http://in.archive.ubuntu.com trusty/universe i386 Packages
Hit http://packages.elasticsearch.org stable/main amd64 Packages
Hit http://in.archive.ubuntu.com trusty/multiverse i386 Packages
Hit http://apt.newrelic.com newrelic/non-free amd64 Packages
Hit http://packages.elasticsearch.org stable/main i386 Packages
Get:20 https://repo.varnish-cache.org precise/varnish-4.0 i386 Packages
Hit http://in.archive.ubuntu.com trusty/main Translation-en
Hit http://apt.newrelic.com newrelic/non-free i386 Packages
Ign http://packages.elasticsearch.org stable/main Translation-en
Hit http://in.archive.ubuntu.com trusty/multiverse Translation-en
Get:21 https://repo.varnish-cache.org precise/varnish-4.0 Translation-en
Hit http://packages.elasticsearch.org stable/main amd64 Packages
Hit http://in.archive.ubuntu.com trusty/restricted Translation-en
Hit http://packages.elasticsearch.org stable/main i386 Packages
Hit http://in.archive.ubuntu.com trusty/universe Translation-en
Get:22 http://in.archive.ubuntu.com trusty-updates/main Sources [160 kB]
Ign http://packages.elasticsearch.org stable/main Translation-en
Hit http://ppa.launchpad.net trusty/main amd64 Packages
Get:23 http://security.ubuntu.com trusty-security/restricted amd64 Packages [8875 B]
Get:24 http://security.ubuntu.com trusty-security/universe amd64 Packages [85.3 kB]
Hit http://ppa.launchpad.net trusty/main i386 Packages
Hit http://ppa.launchpad.net trusty/main Translation-en
Ign https://repo.varnish-cache.org precise/varnish-4.0 Translation-en
Get:25 http://security.ubuntu.com trusty-security/multiverse amd64 Packages [1161 B]
Hit http://wireframesketcher.com  Packages
Get:26 http://security.ubuntu.com trusty-security/main i386 Packages [190 kB]
Get:27 http://in.archive.ubuntu.com trusty-updates/restricted Sources [2061 B]
Get:28 http://in.archive.ubuntu.com trusty-updates/universe Sources [99.4 kB]
Get:29 http://security.ubuntu.com trusty-security/restricted i386 Packages [8846 B]
Get:30 http://security.ubuntu.com trusty-security/universe i386 Packages [85.3 kB]
Get:31 http://in.archive.ubuntu.com trusty-updates/multiverse Sources [4502 B]
Get:32 http://in.archive.ubuntu.com trusty-updates/main amd64 Packages [407 kB]
Ign http://pkg.jenkins-ci.org binary/ Translation-en
Ign http://apt.newrelic.com newrelic/non-free Translation-en
Get:33 http://security.ubuntu.com trusty-security/multiverse i386 Packages [1412 B]
Hit http://security.ubuntu.com trusty-security/main Translation-en
Ign http://wireframesketcher.com  Translation-en
Hit http://security.ubuntu.com trusty-security/multiverse Translation-en
Hit http://security.ubuntu.com trusty-security/restricted Translation-en
Hit http://security.ubuntu.com trusty-security/universe Translation-en
Get:34 http://in.archive.ubuntu.com trusty-updates/restricted amd64 Packages [8875 B]
Get:35 http://in.archive.ubuntu.com trusty-updates/universe amd64 Packages [243 kB]
Get:36 http://in.archive.ubuntu.com trusty-updates/multiverse amd64 Packages [11.2 kB]
Get:37 http://in.archive.ubuntu.com trusty-updates/main i386 Packages [399 kB]
Get:38 http://in.archive.ubuntu.com trusty-updates/restricted i386 Packages [8846 B]
Get:39 http://in.archive.ubuntu.com trusty-updates/universe i386 Packages [243 kB]
Get:40 http://in.archive.ubuntu.com trusty-updates/multiverse i386 Packages [11.4 kB]
Hit http://in.archive.ubuntu.com trusty-updates/main Translation-en
Hit http://in.archive.ubuntu.com trusty-updates/multiverse Translation-en
Hit http://in.archive.ubuntu.com trusty-updates/restricted Translation-en
Hit http://in.archive.ubuntu.com trusty-updates/universe Translation-en
Hit http://in.archive.ubuntu.com trusty-backports/main Sources
Hit http://in.archive.ubuntu.com trusty-backports/restricted Sources
Hit http://in.archive.ubuntu.com trusty-backports/universe Sources
Hit http://in.archive.ubuntu.com trusty-backports/multiverse Sources
Hit http://in.archive.ubuntu.com trusty-backports/main amd64 Packages
Hit http://in.archive.ubuntu.com trusty-backports/restricted amd64 Packages
Hit http://in.archive.ubuntu.com trusty-backports/universe amd64 Packages
Hit http://in.archive.ubuntu.com trusty-backports/multiverse amd64 Packages
Hit http://in.archive.ubuntu.com trusty-backports/main i386 Packages
Hit http://in.archive.ubuntu.com trusty-backports/restricted i386 Packages
Hit http://in.archive.ubuntu.com trusty-backports/universe i386 Packages
Hit http://in.archive.ubuntu.com trusty-backports/multiverse i386 Packages
Hit http://in.archive.ubuntu.com trusty-backports/main Translation-en
Hit http://in.archive.ubuntu.com trusty-backports/multiverse Translation-en
Hit http://in.archive.ubuntu.com trusty-backports/restricted Translation-en
Hit http://in.archive.ubuntu.com trusty-backports/universe Translation-en
Get:41 http://us.archive.ubuntu.com precise/main Translation-en [726 kB]
Get:42 http://us.archive.ubuntu.com precise/universe Translation-en [3341 kB]
Fetched 10.2 MB in 4min 2s (42.1 kB/s)
Temp File /tmp/ptconfigure-temp-script-10553509319.sh Removed
W: Duplicate sources.list entry http://repos.zend.com/zend-server/6.1/deb/ server/non-free amd64 Packages (/var/lib/apt/lists/repos.zend.com_zend-server_6.1_deb_dists_server_non-free_binary-amd64_Packages)
W: Duplicate sources.list entry http://repos.zend.com/zend-server/6.1/deb/ server/non-free amd64 Packages (/var/lib/apt/lists/repos.zend.com_zend-server_6.1_deb_dists_server_non-free_binary-amd64_Packages)
W: Duplicate sources.list entry http://repos.zend.com/zend-server/6.1/deb/ server/non-free amd64 Packages (/var/lib/apt/lists/repos.zend.com_zend-server_6.1_deb_dists_server_non-free_binary-amd64_Packages)
W: Duplicate sources.list entry http://repos.zend.com/zend-server/6.1/deb/ server/non-free amd64 Packages (/var/lib/apt/lists/repos.zend.com_zend-server_6.1_deb_dists_server_non-free_binary-amd64_Packages)
W: Duplicate sources.list entry http://repos.zend.com/zend-server/6.1/deb/ server/non-free amd64 Packages (/var/lib/apt/lists/repos.zend.com_zend-server_6.1_deb_dists_server_non-free_binary-amd64_Packages)
W: Duplicate sources.list entry http://repos.zend.com/zend-server/6.1/deb/ server/non-free amd64 Packages (/var/lib/apt/lists/repos.zend.com_zend-server_6.1_deb_dists_server_non-free_binary-amd64_Packages)
W: Duplicate sources.list entry http://repos.zend.com/zend-server/6.1/deb/ server/non-free amd64 Packages (/var/lib/apt/lists/repos.zend.com_zend-server_6.1_deb_dists_server_non-free_binary-amd64_Packages)
W: Duplicate sources.list entry http://repos.zend.com/zend-server/6.1/deb/ server/non-free amd64 Packages (/var/lib/apt/lists/repos.zend.com_zend-server_6.1_deb_dists_server_non-free_binary-amd64_Packages)
W: Duplicate sources.list entry http://repos.zend.com/zend-server/6.1/deb/ server/non-free i386 Packages (/var/lib/apt/lists/repos.zend.com_zend-server_6.1_deb_dists_server_non-free_binary-i386_Packages)
W: Duplicate sources.list entry http://repos.zend.com/zend-server/6.1/deb/ server/non-free i386 Packages (/var/lib/apt/lists/repos.zend.com_zend-server_6.1_deb_dists_server_non-free_binary-i386_Packages)
W: Duplicate sources.list entry http://repos.zend.com/zend-server/6.1/deb/ server/non-free i386 Packages (/var/lib/apt/lists/repos.zend.com_zend-server_6.1_deb_dists_server_non-free_binary-i386_Packages)
W: Duplicate sources.list entry http://repos.zend.com/zend-server/6.1/deb/ server/non-free i386 Packages (/var/lib/apt/lists/repos.zend.com_zend-server_6.1_deb_dists_server_non-free_binary-i386_Packages)
W: Duplicate sources.list entry http://repos.zend.com/zend-server/6.1/deb/ server/non-free i386 Packages (/var/lib/apt/lists/repos.zend.com_zend-server_6.1_deb_dists_server_non-free_binary-i386_Packages)
W: Duplicate sources.list entry http://repos.zend.com/zend-server/6.1/deb/ server/non-free i386 Packages (/var/lib/apt/lists/repos.zend.com_zend-server_6.1_deb_dists_server_non-free_binary-i386_Packages)
W: Duplicate sources.list entry http://repos.zend.com/zend-server/6.1/deb/ server/non-free i386 Packages (/var/lib/apt/lists/repos.zend.com_zend-server_6.1_deb_dists_server_non-free_binary-i386_Packages)
W: Duplicate sources.list entry http://repos.zend.com/zend-server/6.1/deb/ server/non-free i386 Packages (/var/lib/apt/lists/repos.zend.com_zend-server_6.1_deb_dists_server_non-free_binary-i386_Packages)
W: Duplicate sources.list entry http://us.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages (/var/lib/apt/lists/us.archive.ubuntu.com_ubuntu_dists_precise_main_binary-amd64_Packages)
W: Duplicate sources.list entry http://us.archive.ubuntu.com/ubuntu/ precise/universe amd64 Packages (/var/lib/apt/lists/us.archive.ubuntu.com_ubuntu_dists_precise_universe_binary-amd64_Packages)
W: Duplicate sources.list entry http://us.archive.ubuntu.com/ubuntu/ precise/main i386 Packages (/var/lib/apt/lists/us.archive.ubuntu.com_ubuntu_dists_precise_main_binary-i386_Packages)
W: Duplicate sources.list entry http://us.archive.ubuntu.com/ubuntu/ precise/universe i386 Packages (/var/lib/apt/lists/us.archive.ubuntu.com_ubuntu_dists_precise_universe_binary-i386_Packages)
W: Duplicate sources.list entry https://repo.varnish-cache.org/ubuntu/ precise/varnish-4.0 amd64 Packages (/var/lib/apt/lists/repo.varnish-cache.org_ubuntu_dists_precise_varnish-4.0_binary-amd64_Packages)
W: Duplicate sources.list entry https://repo.varnish-cache.org/ubuntu/ precise/varnish-4.0 amd64 Packages (/var/lib/apt/lists/repo.varnish-cache.org_ubuntu_dists_precise_varnish-4.0_binary-amd64_Packages)
W: Duplicate sources.list entry https://repo.varnish-cache.org/ubuntu/ precise/varnish-4.0 amd64 Packages (/var/lib/apt/lists/repo.varnish-cache.org_ubuntu_dists_precise_varnish-4.0_binary-amd64_Packages)
W: Duplicate sources.list entry https://repo.varnish-cache.org/ubuntu/ precise/varnish-4.0 amd64 Packages (/var/lib/apt/lists/repo.varnish-cache.org_ubuntu_dists_precise_varnish-4.0_binary-amd64_Packages)
W: Duplicate sources.list entry https://repo.varnish-cache.org/ubuntu/ precise/varnish-4.0 amd64 Packages (/var/lib/apt/lists/repo.varnish-cache.org_ubuntu_dists_precise_varnish-4.0_binary-amd64_Packages)
W: Duplicate sources.list entry https://repo.varnish-cache.org/ubuntu/ precise/varnish-4.0 amd64 Packages (/var/lib/apt/lists/repo.varnish-cache.org_ubuntu_dists_precise_varnish-4.0_binary-amd64_Packages)
W: Duplicate sources.list entry https://repo.varnish-cache.org/ubuntu/ precise/varnish-4.0 i386 Packages (/var/lib/apt/lists/repo.varnish-cache.org_ubuntu_dists_precise_varnish-4.0_binary-i386_Packages)
W: Duplicate sources.list entry https://repo.varnish-cache.org/ubuntu/ precise/varnish-4.0 i386 Packages (/var/lib/apt/lists/repo.varnish-cache.org_ubuntu_dists_precise_varnish-4.0_binary-i386_Packages)
W: Duplicate sources.list entry https://repo.varnish-cache.org/ubuntu/ precise/varnish-4.0 i386 Packages (/var/lib/apt/lists/repo.varnish-cache.org_ubuntu_dists_precise_varnish-4.0_binary-i386_Packages)
W: Duplicate sources.list entry https://repo.varnish-cache.org/ubuntu/ precise/varnish-4.0 i386 Packages (/var/lib/apt/lists/repo.varnish-cache.org_ubuntu_dists_precise_varnish-4.0_binary-i386_Packages)
W: Duplicate sources.list entry https://repo.varnish-cache.org/ubuntu/ precise/varnish-4.0 i386 Packages (/var/lib/apt/lists/repo.varnish-cache.org_ubuntu_dists_precise_varnish-4.0_binary-i386_Packages)
W: Duplicate sources.list entry https://repo.varnish-cache.org/ubuntu/ precise/varnish-4.0 i386 Packages (/var/lib/apt/lists/repo.varnish-cache.org_ubuntu_dists_precise_varnish-4.0_binary-i386_Packages)
W: You may want to run apt-get update to correct these problems
E: dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to correct the problem.
[Pharaoh Logging] Adding Package cassandra from the Packager Apt did not execute correctly
... All done!
*******************************
Thanks for installing , visit www.pharaohtools.com for more
******************************


Single App Installer:
--------------------------------------------
Cassandra: Success
------------------------------
Installer Finished
******************************

options¶

Paramètres	Alternative Paramètre	options	commentaires
ptconfigure cassandra Install	Il ya deux autres paramètres qui peuvent être utilisés dans la ligne de commande. Cassandra , cassandra Par exemple: ptconfigure cassandra install ptconfigure cassandra install	Y	Le système démarre processus d’installation
ptconfigure cassandra Install	Il ya deux autres paramètres qui peuvent être utilisés dans la ligne de commande. Cassandra , cassandra Par exemple: ptconfigure cassandra install ptconfigure cassandra install\|	N	Système arrête processus d’installation

avantages¶

Décentralisée - Chaque noeud du cluster a le même rôle. Il n’y a pas de point de défaillance unique. Les données sont distribuées sur le cluster (de sorte que chaque noeud contient des données différentes), mais il n’y a pas de maître que chaque nœud peut desservir toute demande.
Prend en charge la réplication de centre de réplication et de données multi - stratégies de réplication sont configurables. Cassandra est conçu comme un système distribué, pour le déploiement d’un grand nombre de noeuds à travers de multiples centres de données. Les principales caractéristiques de l’architecture distribuée de Cassandra sont spécifiquement adaptés pour le centre de données multiples déploiement, pour la redondance, pour le basculement et la récupération en cas de catastrophe.
Évolutivité - Lire et écrire débit à la fois augmenter linéairement en nouvelles machines sont ajoutés, sans temps d’arrêt ou l’interruption d ‘applications.
Tolérant aux pannes - Les données sont automatiquement répliquées sur plusieurs nœuds pour la tolérance aux pannes. Réplication sur plusieurs centres de données est prise en charge. Nœuds défaillants peuvent être remplacés sans interruption.
La cohérence accordable - écrit et lit offrir un niveau de cohérence accordable, tout le chemin depuis », écrit ne manquent jamais” à “bloc pour toutes les répliques soit lisible”, avec le niveau de quorum au milieu.