BranchesTags

Repository files navigation

Apache Cassandra

Apache Cassandra is a highly-scalable partitioned row store. Rows are organized into tables with a required primary key.

Partitioning means that Cassandra can distribute your data across multiple machines in an application-transparent matter. Cassandra will automatically repartition as machines are added and removed from the cluster.

Row store means that like relational databases, Cassandra organizes data by rows and columns. The Cassandra Query Language (CQL) is a close relative of SQL.

For more information, see the Apache Cassandra web site.

Issues should be reported on The Cassandra Jira.

Requirements

  • Java: see supported versions in build.xml (search for property "java.supported").

  • Python: for cqlsh, see bin/cqlsh (search for function "is_supported_version").

Getting started

This short guide will walk you through getting a basic one node cluster up and running, and demonstrate some simple reads and writes. For a more-complete guide, please see the Apache Cassandra website’s Getting Started Guide.

First, we’ll unpack our archive:

$ tar -zxvf apache-cassandra-$VERSION.tar.gz
$ cd apache-cassandra-$VERSION

After that we start the server. Running the startup script with the -f argument will cause Cassandra to remain in the foreground and log to standard out; it can be stopped with ctrl-C.

$ bin/cassandra -f

Now let’s try to read and write some data using the Cassandra Query Language:

$ bin/cqlsh

The command line client is interactive so if everything worked you should be sitting in front of a prompt:

Connected to Test Cluster at localhost:9160.
[cqlsh 6.2.0 | Cassandra 5.0-SNAPSHOT | CQL spec 3.4.7 | Native protocol v5]
Use HELP for help.
cqlsh>

As the banner says, you can use 'help;' or '?' to see what CQL has to offer, and 'quit;' or 'exit;' when you’ve had enough fun. But lets try something slightly more interesting:

cqlsh> CREATE KEYSPACE schema1
WITH replication = { 'class' : 'SimpleStrategy', 'replication_factor' : 1 };
cqlsh> USE schema1;
cqlsh:Schema1> CREATE TABLE users (
user_id varchar PRIMARY KEY,
first varchar,
last varchar,
age int
);
cqlsh:Schema1> INSERT INTO users (user_id, first, last, age)
VALUES ('jsmith', 'John', 'Smith', 42);
cqlsh:Schema1> SELECT * FROM users;
user_id | age | first | last
---------+-----+-------+-------
jsmith | 42 | john | smith
cqlsh:Schema1>

If your session looks similar to what’s above, congrats, your single node cluster is operational!

For more on what commands are supported by CQL, see the CQL reference. A reasonable way to think of it is as, "SQL minus joins and subqueries, plus collections."

Wondering where to go from here?

About

Mirror of Apache Cassandra (incubating)

Resources

Readme
Apache-2.0 license

Contributing

Contributing
Activity

Stars

1 star

Watchers

1 watching

Forks

0 forks
Report repository

Releases

Packages

Contributors

Languages

, 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
 blocks
(function() {
function addCopyButtons() {
document.querySelectorAll('pre code').forEach(function(codeBlock) {
if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;
codeBlock.parentElement.setAttribute('data-copy-added', 'true');
var btn = document.createElement('button');
btn.textContent = 'Copy';
btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';
btn.onmouseover = function() { this.style.opacity = '1'; };
btn.onmouseout = function() { this.style.opacity = '0.7'; };
btn.onclick = function() {
navigator.clipboard.writeText(codeBlock.textContent).then(function() {
btn.textContent = 'Copied!';
setTimeout(function() { btn.textContent = 'Copy'; }, 1500);
});
};
codeBlock.parentElement.style.position = 'relative';
codeBlock.parentElement.appendChild(btn);
});
}
addCopyButtons();
// Re-run on dynamic content
var observer = new MutationObserver(addCopyButtons);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

Skip to content
BranchesTags
Repository files navigation
Apache Cassandra
Apache Cassandra is a highly-scalable partitioned row store. Rows are organized into tables with a required primary key.
Partitioning means that Cassandra can distribute your data across multiple machines in an application-transparent matter. Cassandra will automatically repartition as machines are added and removed from the cluster.
Row store means that like relational databases, Cassandra organizes data by rows and columns. The Cassandra Query Language (CQL) is a close relative of SQL.
For more information, see the Apache Cassandra web site.
Issues should be reported on The Cassandra Jira.
Requirements
  • Java: see supported versions in build.xml (search for property "java.supported").
  • Python: for cqlsh, see bin/cqlsh (search for function "is_supported_version").
Getting started
This short guide will walk you through getting a basic one node cluster up
and running, and demonstrate some simple reads and writes. For a more-complete guide, please see the Apache Cassandra website’s Getting Started Guide.
First, we’ll unpack our archive:
$ tar -zxvf apache-cassandra-$VERSION.tar.gz
$ cd apache-cassandra-$VERSION
After that we start the server. Running the startup script with the -f argument will cause
Cassandra to remain in the foreground and log to standard out; it can be stopped with ctrl-C.
$ bin/cassandra -f
Now let’s try to read and write some data using the Cassandra Query Language:
$ bin/cqlsh
The command line client is interactive so if everything worked you should
be sitting in front of a prompt:
Connected to Test Cluster at localhost:9160.
[cqlsh 6.2.0 | Cassandra 5.0-SNAPSHOT | CQL spec 3.4.7 | Native protocol v5]
Use HELP for help.
cqlsh>
As the banner says, you can use 'help;' or '?' to see what CQL has to
offer, and 'quit;' or 'exit;' when you’ve had enough fun. But lets try
something slightly more interesting:
cqlsh> CREATE KEYSPACE schema1
WITH replication = { 'class' : 'SimpleStrategy', 'replication_factor' : 1 };
cqlsh> USE schema1;
cqlsh:Schema1> CREATE TABLE users (
user_id varchar PRIMARY KEY,
first varchar,
last varchar,
age int
);
cqlsh:Schema1> INSERT INTO users (user_id, first, last, age)
VALUES ('jsmith', 'John', 'Smith', 42);
cqlsh:Schema1> SELECT * FROM users;
user_id | age | first | last
---------+-----+-------+-------
jsmith | 42 | john | smith
cqlsh:Schema1>
If your session looks similar to what’s above, congrats, your single node
cluster is operational!
For more on what commands are supported by CQL, see
the CQL reference. A
reasonable way to think of it is as, "SQL minus joins and subqueries, plus collections."
Wondering where to go from here?
About
Mirror of Apache Cassandra (incubating)
Resources
Readme
Apache-2.0 license
Contributing
Contributing
Activity
Stars
1 star
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Force GitHub README to respect dark mode
(function() {
var style = document.createElement('style');
style.textContent = '
.markdown-body {
color-scheme: dark light;
}
.markdown-body pre { background: #161b22 !important; }
.markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }
.markdown-body table th, .markdown-body table td { border-color: #30363d !important; }
.markdown-body img { background: #0d1117; }
.markdown-body blockquote { border-left-color: #8b949e; }
.markdown-body hr { border-color: #30363d; }
';
document.head.appendChild(style);
})();
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Apache Cassandra
Apache Cassandra is a highly-scalable partitioned row store. Rows are organized into tables with a required primary key.
Partitioning means that Cassandra can distribute your data across multiple machines in an application-transparent matter. Cassandra will automatically repartition as machines are added and removed from the cluster.
Row store means that like relational databases, Cassandra organizes data by rows and columns. The Cassandra Query Language (CQL) is a close relative of SQL.
For more information, see the Apache Cassandra web site.
Issues should be reported on The Cassandra Jira.
Requirements
  • Java: see supported versions in build.xml (search for property "java.supported").
  • Python: for cqlsh, see bin/cqlsh (search for function "is_supported_version").
Getting started
This short guide will walk you through getting a basic one node cluster up
and running, and demonstrate some simple reads and writes. For a more-complete guide, please see the Apache Cassandra website’s Getting Started Guide.
First, we’ll unpack our archive:
$ tar -zxvf apache-cassandra-$VERSION.tar.gz
$ cd apache-cassandra-$VERSION
After that we start the server. Running the startup script with the -f argument will cause
Cassandra to remain in the foreground and log to standard out; it can be stopped with ctrl-C.
$ bin/cassandra -f
Now let’s try to read and write some data using the Cassandra Query Language:
$ bin/cqlsh
The command line client is interactive so if everything worked you should
be sitting in front of a prompt:
Connected to Test Cluster at localhost:9160.
[cqlsh 6.2.0 | Cassandra 5.0-SNAPSHOT | CQL spec 3.4.7 | Native protocol v5]
Use HELP for help.
cqlsh>
As the banner says, you can use 'help;' or '?' to see what CQL has to
offer, and 'quit;' or 'exit;' when you’ve had enough fun. But lets try
something slightly more interesting:
cqlsh> CREATE KEYSPACE schema1
WITH replication = { 'class' : 'SimpleStrategy', 'replication_factor' : 1 };
cqlsh> USE schema1;
cqlsh:Schema1> CREATE TABLE users (
user_id varchar PRIMARY KEY,
first varchar,
last varchar,
age int
);
cqlsh:Schema1> INSERT INTO users (user_id, first, last, age)
VALUES ('jsmith', 'John', 'Smith', 42);
cqlsh:Schema1> SELECT * FROM users;
user_id | age | first | last
---------+-----+-------+-------
jsmith | 42 | john | smith
cqlsh:Schema1>
If your session looks similar to what’s above, congrats, your single node
cluster is operational!
For more on what commands are supported by CQL, see
the CQL reference. A
reasonable way to think of it is as, "SQL minus joins and subqueries, plus collections."
Wondering where to go from here?
About
Mirror of Apache Cassandra (incubating)
Resources
Readme
Apache-2.0 license
Contributing
Contributing
Activity
Stars
1 star
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
(function() {
var ref = document.referrer;
var terms = [];
if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {
var url = new URL(ref);
var q = url.searchParams.get('q') || url.searchParams.get('p');
if (q) {
terms = q.split(/\s+/).filter(function(t) { return t.length > 2; });
}
}
if (terms.length === 0) return;
var style = document.createElement('style');
style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';
document.head.appendChild(style);
function highlight(node) {
if (node.nodeType === 3) { // text node
var text = node.textContent;
var found = false;
terms.forEach(function(term) {
var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi');
if (regex.test(text)) {
found = true;
var frag = document.createDocumentFragment();
var parts = text.split(regex);
parts.forEach(function(part, i) {
if (i % 2 === 0) {
frag.appendChild(document.createTextNode(part));
} else {
var span = document.createElement('span');
span.className = 'userscript-highlight';
span.textContent = part;
frag.appendChild(span);
}
});
node.parentNode.replaceChild(frag, node);
}
});
} else if (node.nodeType === 1 && node.childNodes) { // element
var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];
if (!skipTags.includes(node.tagName)) {
Array.from(node.childNodes).forEach(highlight);
}
}
}
highlight(document.body);
// Re-highlight on dynamic content
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1 || node.nodeType === 3) highlight(node);
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Apache Cassandra
Apache Cassandra is a highly-scalable partitioned row store. Rows are organized into tables with a required primary key.
Partitioning means that Cassandra can distribute your data across multiple machines in an application-transparent matter. Cassandra will automatically repartition as machines are added and removed from the cluster.
Row store means that like relational databases, Cassandra organizes data by rows and columns. The Cassandra Query Language (CQL) is a close relative of SQL.
For more information, see the Apache Cassandra web site.
Issues should be reported on The Cassandra Jira.
Requirements
  • Java: see supported versions in build.xml (search for property "java.supported").
  • Python: for cqlsh, see bin/cqlsh (search for function "is_supported_version").
Getting started
This short guide will walk you through getting a basic one node cluster up
and running, and demonstrate some simple reads and writes. For a more-complete guide, please see the Apache Cassandra website’s Getting Started Guide.
First, we’ll unpack our archive:
$ tar -zxvf apache-cassandra-$VERSION.tar.gz
$ cd apache-cassandra-$VERSION
After that we start the server. Running the startup script with the -f argument will cause
Cassandra to remain in the foreground and log to standard out; it can be stopped with ctrl-C.
$ bin/cassandra -f
Now let’s try to read and write some data using the Cassandra Query Language:
$ bin/cqlsh
The command line client is interactive so if everything worked you should
be sitting in front of a prompt:
Connected to Test Cluster at localhost:9160.
[cqlsh 6.2.0 | Cassandra 5.0-SNAPSHOT | CQL spec 3.4.7 | Native protocol v5]
Use HELP for help.
cqlsh>
As the banner says, you can use 'help;' or '?' to see what CQL has to
offer, and 'quit;' or 'exit;' when you’ve had enough fun. But lets try
something slightly more interesting:
cqlsh> CREATE KEYSPACE schema1
WITH replication = { 'class' : 'SimpleStrategy', 'replication_factor' : 1 };
cqlsh> USE schema1;
cqlsh:Schema1> CREATE TABLE users (
user_id varchar PRIMARY KEY,
first varchar,
last varchar,
age int
);
cqlsh:Schema1> INSERT INTO users (user_id, first, last, age)
VALUES ('jsmith', 'John', 'Smith', 42);
cqlsh:Schema1> SELECT * FROM users;
user_id | age | first | last
---------+-----+-------+-------
jsmith | 42 | john | smith
cqlsh:Schema1>
If your session looks similar to what’s above, congrats, your single node
cluster is operational!
For more on what commands are supported by CQL, see
the CQL reference. A
reasonable way to think of it is as, "SQL minus joins and subqueries, plus collections."
Wondering where to go from here?
About
Mirror of Apache Cassandra (incubating)
Resources
Readme
Apache-2.0 license
Contributing
Contributing
Activity
Stars
1 star
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
BranchesTags
Repository files navigation
Apache Cassandra
Apache Cassandra is a highly-scalable partitioned row store. Rows are organized into tables with a required primary key.
Partitioning means that Cassandra can distribute your data across multiple machines in an application-transparent matter. Cassandra will automatically repartition as machines are added and removed from the cluster.
Row store means that like relational databases, Cassandra organizes data by rows and columns. The Cassandra Query Language (CQL) is a close relative of SQL.
For more information, see the Apache Cassandra web site.
Issues should be reported on The Cassandra Jira.
Requirements
  • Java: see supported versions in build.xml (search for property "java.supported").
  • Python: for cqlsh, see bin/cqlsh (search for function "is_supported_version").
Getting started
This short guide will walk you through getting a basic one node cluster up
and running, and demonstrate some simple reads and writes. For a more-complete guide, please see the Apache Cassandra website’s Getting Started Guide.
First, we’ll unpack our archive:
$ tar -zxvf apache-cassandra-$VERSION.tar.gz
$ cd apache-cassandra-$VERSION
After that we start the server. Running the startup script with the -f argument will cause
Cassandra to remain in the foreground and log to standard out; it can be stopped with ctrl-C.
$ bin/cassandra -f
Now let’s try to read and write some data using the Cassandra Query Language:
$ bin/cqlsh
The command line client is interactive so if everything worked you should
be sitting in front of a prompt:
Connected to Test Cluster at localhost:9160.
[cqlsh 6.2.0 | Cassandra 5.0-SNAPSHOT | CQL spec 3.4.7 | Native protocol v5]
Use HELP for help.
cqlsh>
As the banner says, you can use 'help;' or '?' to see what CQL has to
offer, and 'quit;' or 'exit;' when you’ve had enough fun. But lets try
something slightly more interesting:
cqlsh> CREATE KEYSPACE schema1
WITH replication = { 'class' : 'SimpleStrategy', 'replication_factor' : 1 };
cqlsh> USE schema1;
cqlsh:Schema1> CREATE TABLE users (
user_id varchar PRIMARY KEY,
first varchar,
last varchar,
age int
);
cqlsh:Schema1> INSERT INTO users (user_id, first, last, age)
VALUES ('jsmith', 'John', 'Smith', 42);
cqlsh:Schema1> SELECT * FROM users;
user_id | age | first | last
---------+-----+-------+-------
jsmith | 42 | john | smith
cqlsh:Schema1>
If your session looks similar to what’s above, congrats, your single node
cluster is operational!
For more on what commands are supported by CQL, see
the CQL reference. A
reasonable way to think of it is as, "SQL minus joins and subqueries, plus collections."
Wondering where to go from here?
About
Mirror of Apache Cassandra (incubating)
Resources
Readme
Apache-2.0 license
Contributing
Contributing
Activity
Stars
1 star
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
}
// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Apache Cassandra
Apache Cassandra is a highly-scalable partitioned row store. Rows are organized into tables with a required primary key.
Partitioning means that Cassandra can distribute your data across multiple machines in an application-transparent matter. Cassandra will automatically repartition as machines are added and removed from the cluster.
Row store means that like relational databases, Cassandra organizes data by rows and columns. The Cassandra Query Language (CQL) is a close relative of SQL.
For more information, see the Apache Cassandra web site.
Issues should be reported on The Cassandra Jira.
Requirements
  • Java: see supported versions in build.xml (search for property "java.supported").
  • Python: for cqlsh, see bin/cqlsh (search for function "is_supported_version").
Getting started
This short guide will walk you through getting a basic one node cluster up
and running, and demonstrate some simple reads and writes. For a more-complete guide, please see the Apache Cassandra website’s Getting Started Guide.
First, we’ll unpack our archive:
$ tar -zxvf apache-cassandra-$VERSION.tar.gz
$ cd apache-cassandra-$VERSION
After that we start the server. Running the startup script with the -f argument will cause
Cassandra to remain in the foreground and log to standard out; it can be stopped with ctrl-C.
$ bin/cassandra -f
Now let’s try to read and write some data using the Cassandra Query Language:
$ bin/cqlsh
The command line client is interactive so if everything worked you should
be sitting in front of a prompt:
Connected to Test Cluster at localhost:9160.
[cqlsh 6.2.0 | Cassandra 5.0-SNAPSHOT | CQL spec 3.4.7 | Native protocol v5]
Use HELP for help.
cqlsh>
As the banner says, you can use 'help;' or '?' to see what CQL has to
offer, and 'quit;' or 'exit;' when you’ve had enough fun. But lets try
something slightly more interesting:
cqlsh> CREATE KEYSPACE schema1
WITH replication = { 'class' : 'SimpleStrategy', 'replication_factor' : 1 };
cqlsh> USE schema1;
cqlsh:Schema1> CREATE TABLE users (
user_id varchar PRIMARY KEY,
first varchar,
last varchar,
age int
);
cqlsh:Schema1> INSERT INTO users (user_id, first, last, age)
VALUES ('jsmith', 'John', 'Smith', 42);
cqlsh:Schema1> SELECT * FROM users;
user_id | age | first | last
---------+-----+-------+-------
jsmith | 42 | john | smith
cqlsh:Schema1>
If your session looks similar to what’s above, congrats, your single node
cluster is operational!
For more on what commands are supported by CQL, see
the CQL reference. A
reasonable way to think of it is as, "SQL minus joins and subqueries, plus collections."
Wondering where to go from here?
About
Mirror of Apache Cassandra (incubating)
Resources
Readme
Apache-2.0 license
Contributing
Contributing
Activity
Stars
1 star
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
(function() {
function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
});
}
unstick();
var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Apache Cassandra
Apache Cassandra is a highly-scalable partitioned row store. Rows are organized into tables with a required primary key.
Partitioning means that Cassandra can distribute your data across multiple machines in an application-transparent matter. Cassandra will automatically repartition as machines are added and removed from the cluster.
Row store means that like relational databases, Cassandra organizes data by rows and columns. The Cassandra Query Language (CQL) is a close relative of SQL.
For more information, see the Apache Cassandra web site.
Issues should be reported on The Cassandra Jira.
Requirements
  • Java: see supported versions in build.xml (search for property "java.supported").
  • Python: for cqlsh, see bin/cqlsh (search for function "is_supported_version").
Getting started
This short guide will walk you through getting a basic one node cluster up
and running, and demonstrate some simple reads and writes. For a more-complete guide, please see the Apache Cassandra website’s Getting Started Guide.
First, we’ll unpack our archive:
$ tar -zxvf apache-cassandra-$VERSION.tar.gz
$ cd apache-cassandra-$VERSION
After that we start the server. Running the startup script with the -f argument will cause
Cassandra to remain in the foreground and log to standard out; it can be stopped with ctrl-C.
$ bin/cassandra -f
Now let’s try to read and write some data using the Cassandra Query Language:
$ bin/cqlsh
The command line client is interactive so if everything worked you should
be sitting in front of a prompt:
Connected to Test Cluster at localhost:9160.
[cqlsh 6.2.0 | Cassandra 5.0-SNAPSHOT | CQL spec 3.4.7 | Native protocol v5]
Use HELP for help.
cqlsh>
As the banner says, you can use 'help;' or '?' to see what CQL has to
offer, and 'quit;' or 'exit;' when you’ve had enough fun. But lets try
something slightly more interesting:
cqlsh> CREATE KEYSPACE schema1
WITH replication = { 'class' : 'SimpleStrategy', 'replication_factor' : 1 };
cqlsh> USE schema1;
cqlsh:Schema1> CREATE TABLE users (
user_id varchar PRIMARY KEY,
first varchar,
last varchar,
age int
);
cqlsh:Schema1> INSERT INTO users (user_id, first, last, age)
VALUES ('jsmith', 'John', 'Smith', 42);
cqlsh:Schema1> SELECT * FROM users;
user_id | age | first | last
---------+-----+-------+-------
jsmith | 42 | john | smith
cqlsh:Schema1>
If your session looks similar to what’s above, congrats, your single node
cluster is operational!
For more on what commands are supported by CQL, see
the CQL reference. A
reasonable way to think of it is as, "SQL minus joins and subqueries, plus collections."
Wondering where to go from here?
About
Mirror of Apache Cassandra (incubating)
Resources
Readme
Apache-2.0 license
Contributing
Contributing
Activity
Stars
1 star
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Universal Dark Mode - works on any site
(function() {
var enabled = true;
function applyDarkMode() {
if (!enabled) return;
// Create style element if it doesn't exist
var style = document.getElementById('universal-dark-mode-style');
if (!style) {
style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
// Dark mode CSS - inverts colors but preserves images/video
style.textContent = '
/* Invert everything except media */
html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
/* Restore images, videos, iframes, canvas */
img, video, iframe, canvas, svg, picture, [style*="background-image"] {
filter: invert(1) hue-rotate(180deg) !important;
}
/* Preserve specific elements that should not be inverted */
.no-dark-mode, .no-dark-mode *,
[data-theme="light"], [data-theme="light"],
.ace_editor, .ace_editor *,
.CodeMirror, .CodeMirror *,
.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
}
/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
}
/* Scrollbars */
::-webkit-scrollbar { background: #1a1a2e !important; }
::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
function removeDarkMode() {
var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
}
// Toggle with Alt+Shift+D
document.addEventListener('keydown', function(e) {
if (e.altKey && e.shiftKey && e.key === 'D') {
e.preventDefault();
enabled = !enabled;
if (enabled) {
applyDarkMode();
console.log('[Universal Dark Mode] Enabled');
} else {
removeDarkMode();
console.log('[Universal Dark Mode] Disabled');
}
}
});
// Apply on load
applyDarkMode();
// Re-apply on dynamic content
var observer = new MutationObserver(function(mutations) {
if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

Skip to content
BranchesTags
Repository files navigation
Apache Cassandra
Apache Cassandra is a highly-scalable partitioned row store. Rows are organized into tables with a required primary key.
Partitioning means that Cassandra can distribute your data across multiple machines in an application-transparent matter. Cassandra will automatically repartition as machines are added and removed from the cluster.
Row store means that like relational databases, Cassandra organizes data by rows and columns. The Cassandra Query Language (CQL) is a close relative of SQL.
For more information, see the Apache Cassandra web site.
Issues should be reported on The Cassandra Jira.
Requirements
  • Java: see supported versions in build.xml (search for property "java.supported").
  • Python: for cqlsh, see bin/cqlsh (search for function "is_supported_version").
Getting started
This short guide will walk you through getting a basic one node cluster up
and running, and demonstrate some simple reads and writes. For a more-complete guide, please see the Apache Cassandra website’s Getting Started Guide.
First, we’ll unpack our archive:
$ tar -zxvf apache-cassandra-$VERSION.tar.gz
$ cd apache-cassandra-$VERSION
After that we start the server. Running the startup script with the -f argument will cause
Cassandra to remain in the foreground and log to standard out; it can be stopped with ctrl-C.
$ bin/cassandra -f
Now let’s try to read and write some data using the Cassandra Query Language:
$ bin/cqlsh
The command line client is interactive so if everything worked you should
be sitting in front of a prompt:
Connected to Test Cluster at localhost:9160.
[cqlsh 6.2.0 | Cassandra 5.0-SNAPSHOT | CQL spec 3.4.7 | Native protocol v5]
Use HELP for help.
cqlsh>
As the banner says, you can use 'help;' or '?' to see what CQL has to
offer, and 'quit;' or 'exit;' when you’ve had enough fun. But lets try
something slightly more interesting:
cqlsh> CREATE KEYSPACE schema1
WITH replication = { 'class' : 'SimpleStrategy', 'replication_factor' : 1 };
cqlsh> USE schema1;
cqlsh:Schema1> CREATE TABLE users (
user_id varchar PRIMARY KEY,
first varchar,
last varchar,
age int
);
cqlsh:Schema1> INSERT INTO users (user_id, first, last, age)
VALUES ('jsmith', 'John', 'Smith', 42);
cqlsh:Schema1> SELECT * FROM users;
user_id | age | first | last
---------+-----+-------+-------
jsmith | 42 | john | smith
cqlsh:Schema1>
If your session looks similar to what’s above, congrats, your single node
cluster is operational!
For more on what commands are supported by CQL, see
the CQL reference. A
reasonable way to think of it is as, "SQL minus joins and subqueries, plus collections."
Wondering where to go from here?
About
Mirror of Apache Cassandra (incubating)
Resources
Readme
Apache-2.0 license
Contributing
Contributing
Activity
Stars
1 star
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages