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Posted to commits@cassandra.apache.org by ee...@apache.org on 2011/02/14 17:59:51 UTC
svn commit: r1070573 - in /cassandra/trunk/doc/cql: CQL.html CQL.textile
Author: eevans
Date: Mon Feb 14 16:59:51 2011
New Revision: 1070573
URL: http://svn.apache.org/viewvc?rev=1070573&view=rev
Log:
updated documentation for CREATE COLUMNFAMILY
Patch by eevans for CASSANDRA-1709; reviewed by gdusbabek
Modified:
cassandra/trunk/doc/cql/CQL.html
cassandra/trunk/doc/cql/CQL.textile
Modified: cassandra/trunk/doc/cql/CQL.html
URL: http://svn.apache.org/viewvc/cassandra/trunk/doc/cql/CQL.html?rev=1070573&r1=1070572&r2=1070573&view=diff
==============================================================================
--- cassandra/trunk/doc/cql/CQL.html (original)
+++ cassandra/trunk/doc/cql/CQL.html Mon Feb 14 16:59:51 2011
@@ -1,4 +1,4 @@
-<?xml version='1.0' encoding='utf-8' ?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"/></head><body><h1 id="CassandraQueryLanguageCQLv0.99.1">Cassandra Query Language (CQL) v0.99.1</h1><h2 id="TableofContents">Table of Contents</h2><ol style="list-style: none;"><li><a href="#CassandraQueryLanguageCQLv0.99.1">Cassandra Query Language (CQL) v0.99.1</a><ol style="list-style: none;"><li><a href="#TableofContents">Table of Contents</a></li><li><a href="#USE">USE</a></li><li><a href="#SELECT">SELECT</a><ol style="list-style: none;"><li><a href="#SpecifyingColumns">Specifying Columns</a></li><li><a href="#ColumnFamily">Column Family</a></li><li><a href="#ConsistencyLevel">Consistency Level</a></li><li><a href="#Filteringrows">Filtering rows</a></li><li><a href="#Limits">Limits</a></li></ol></li>
<li><a href="#UPDATE">UPDATE</a><ol style="list-style: none;"><li><a href="#ColumnFamily2">Column Family</a></li><li><a href="#ConsistencyLevel2">Consistency Level</a></li><li><a href="#SpecifyingColumnsandRow">Specifying Columns and Row</a></li></ol></li><li><a href="#DELETE">DELETE</a><ol style="list-style: none;"><li><a href="#SpecifyingColumns2">Specifying Columns</a></li><li><a href="#ColumnFamily3">Column Family</a></li><li><a href="#ConsistencyLevel3">Consistency Level</a></li><li><a href="#deleterows">Specifying Rows</a></li></ol></li><li><a href="#TRUNCATE">TRUNCATE</a></li><li><a href="#CREATEKEYSPACE">CREATE KEYSPACE</a></li><li><a href="#CommonIdioms">Common Idioms</a><ol style="list-style: none;"><li><a href="#consistency">Specifying Consistency</a></li><li><a href="#terms">Term specification</a><ol style="list-style: none;"><li><a href="#string_literals">String Literals</a></li><li><a href="#Unicode">Unicode</a></li><li><a href="#Integerslongs">Integers / longs
</a></li><li><a href="#UUIDs">UUIDs</a></li></ol></li></ol></li></ol></li></ol><h2 id="USE">USE</h2><p><i>Synopsis:</i></p><pre><code>USE <KEYSPACE>;
+<?xml version='1.0' encoding='utf-8' ?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"/></head><body><h1 id="CassandraQueryLanguageCQLv0.99.1">Cassandra Query Language (CQL) v0.99.1</h1><h2 id="TableofContents">Table of Contents</h2><ol style="list-style: none;"><li><a href="#CassandraQueryLanguageCQLv0.99.1">Cassandra Query Language (CQL) v0.99.1</a><ol style="list-style: none;"><li><a href="#TableofContents">Table of Contents</a></li><li><a href="#USE">USE</a></li><li><a href="#SELECT">SELECT</a><ol style="list-style: none;"><li><a href="#SpecifyingColumns">Specifying Columns</a></li><li><a href="#ColumnFamily">Column Family</a></li><li><a href="#ConsistencyLevel">Consistency Level</a></li><li><a href="#Filteringrows">Filtering rows</a></li><li><a href="#Limits">Limits</a></li></ol></li>
<li><a href="#UPDATE">UPDATE</a><ol style="list-style: none;"><li><a href="#ColumnFamily2">Column Family</a></li><li><a href="#ConsistencyLevel2">Consistency Level</a></li><li><a href="#SpecifyingColumnsandRow">Specifying Columns and Row</a></li></ol></li><li><a href="#DELETE">DELETE</a><ol style="list-style: none;"><li><a href="#SpecifyingColumns2">Specifying Columns</a></li><li><a href="#ColumnFamily3">Column Family</a></li><li><a href="#ConsistencyLevel3">Consistency Level</a></li><li><a href="#deleterows">Specifying Rows</a></li></ol></li><li><a href="#TRUNCATE">TRUNCATE</a></li><li><a href="#CREATEKEYSPACE">CREATE KEYSPACE</a></li><li><a href="#CREATECOLUMNFAMILY">CREATE COLUMNFAMILY</a><ol style="list-style: none;"><li><a href="#columntypes">Specifying Column Type (optional)</a></li><li><a href="#ColumnFamilyOptionsoptional">Column Family Options (optional)</a></li></ol></li><li><a href="#CommonIdioms">Common Idioms</a><ol style="list-style: none;"><li><a href="#consis
tency">Specifying Consistency</a></li><li><a href="#terms">Term specification</a><ol style="list-style: none;"><li><a href="#string_literals">String Literals</a></li><li><a href="#Unicode">Unicode</a></li><li><a href="#Integerslongs">Integers / longs</a></li><li><a href="#UUIDs">UUIDs</a></li></ol></li></ol></li></ol></li></ol><h2 id="USE">USE</h2><p><i>Synopsis:</i></p><pre><code>USE <KEYSPACE>;
</code></pre><p>A <code>USE</code> statement consists of the <code>USE</code> keyword, followed by a valid keyspace name. Its purpose is to assign the per-connection, current working keyspace. All subsequent keyspace-specific actions will be performed in the context of the supplied value.</p><h2 id="SELECT">SELECT</h2><p><i>Synopsis:</i></p><pre><code>SELECT [FIRST N] [REVERSED] <SELECT EXPR> FROM <COLUMN FAMILY> [USING <CONSISTENCY>]
[WHERE <CLAUSE>] [LIMIT N];
</code></pre><p>A <code>SELECT</code> is used to read one or more records from a Cassandra column family. It returns a result-set of rows, where each row consists of a key and a collection of columns corresponding to the query.</p><h3 id="SpecifyingColumns">Specifying Columns</h3><pre><code>SELECT [FIRST N] [REVERSED] name1, name2, name3 FROM ...
@@ -28,5 +28,9 @@ UPDATE ... WHERE KEY IN (keyname1, keyna
</code></pre><p>The <code>WHERE</code> clause is used to determine which row(s) a <code>DELETE</code> applies to. The first form allows the specification of a single keyname using the <code>KEY</code> keyword and the <code>=</code> operator. The second form allows a list of keyname terms to be specified using the <code>IN</code> notation and a parenthesized list of comma-delimited keyname terms.</p><h2 id="TRUNCATE">TRUNCATE</h2><p><em>Synopsis:</em></p><pre><code>TRUNCATE <COLUMN FAMILY>
</code></pre><p>Accepts a single argument for the column family name, and permanently removes all data from said column family.</p><h2 id="CREATEKEYSPACE">CREATE KEYSPACE</h2><p><em>Synopsis:</em></p><pre><code>CREATE KEYSPACE <NAME> WITH replication_factor = <NUM> AND strategy_class = "<STRATEGY>"
[AND strategy_options.<OPTION> = <VALUE> [AND strategy_options.<OPTION> = <VALUE>]];
-</code></pre><p>The <code>CREATE KEYSPACE</code> statement creates a new top-level namespace (aka “keyspace”). Valid names are any string constructed of alphanumeric characters and underscores, but must begin with a letter. Properties such as replication strategy and count are specified during creation using the following accepted keyword arguments:</p><table><tr><th>keyword</th><th>required</th><th>description</th></tr><tr><td>replication_factor</td><td>yes</td><td>Numeric argument that specifies the number of replicas for this keyspace.</td></tr><tr><td>strategy_class</td><td>yes</td><td>Class name to use for managing replica placement. Any of the shipped strategies can be used by specifying the class name relative to org.apache.cassandra.locator, others will need to be fully-qualified and located on the classpath.</td></tr><tr><td>strategy_options</td><td>no</td><td>Some strategies require additional arguments which can be supplied by appending the option na
me to the <code>strategy_options</code> keyword, separated by a colon (<code>:</code>). For example, a strategy option of “DC1” with a value of “1” would be specified as <code>strategy_options:DC1 = "1"</code>.</td></tr></table><h2 id="CommonIdioms">Common Idioms</h2><h3 id="consistency">Specifying Consistency</h3><pre><code>... USING <CONSISTENCY> ...
+</code></pre><p>The <code>CREATE KEYSPACE</code> statement creates a new top-level namespace (aka “keyspace”). Valid names are any string constructed of alphanumeric characters and underscores, but must begin with a letter. Properties such as replication strategy and count are specified during creation using the following accepted keyword arguments:</p><table><tr><th>keyword</th><th>required</th><th>description</th></tr><tr><td>replication_factor</td><td>yes</td><td>Numeric argument that specifies the number of replicas for this keyspace.</td></tr><tr><td>strategy_class</td><td>yes</td><td>Class name to use for managing replica placement. Any of the shipped strategies can be used by specifying the class name relative to org.apache.cassandra.locator, others will need to be fully-qualified and located on the classpath.</td></tr><tr><td>strategy_options</td><td>no</td><td>Some strategies require additional arguments which can be supplied by appending the option na
me to the <code>strategy_options</code> keyword, separated by a colon (<code>:</code>). For example, a strategy option of “DC1” with a value of “1” would be specified as <code>strategy_options:DC1 = "1"</code>.</td></tr></table><h2 id="CREATECOLUMNFAMILY">CREATE COLUMNFAMILY</h2><p><em>Synopsis:</em></p><pre><code>CREATE COLUMNFAMILY <COLUMN FAMILY> [(name1 type, name2 type, ...)] [WITH keyword1 = arg1
+ [AND keyword2 = arg2 [AND ...]]];
+</code></pre><p><code>CREATE COLUMNFAMILY</code> statements create new column family namespaces under the current keyspace. Valid column family names are strings of alphanumeric characters and underscores, which begin with a letter.</p><h3 id="columntypes">Specifying Column Type (optional)</h3><pre><code>CREATE COLUMNFAMILY <COLUMN FAMILY> (name1 type, name2 type) ...;
+</code></pre><p>It is possible to assign columns a type during column family creation. Columns configured with a type are validated accordingly when a write occurs. Column types are specified as a parenthesized, comma-separated list of column term and type pairs. The list of recognized types are:</p><table><tr><th>type</th><th>description</th></tr><tr><td>bytes</td><td>Arbitrary bytes (no validation)</td></tr><tr><td>ascii</td><td>ASCII character string</td></tr><tr><td>utf8</td><td>UTF8 encoded string</td></tr><tr><td>timeuuid</td><td>Type 1 UUID</td></tr><tr><td>uuid</td><td>Type 4 UUID</td></tr><tr><td>int</td><td>4-byte integer</td></tr><tr><td>long</td><td>8-byte long</td></tr></table><p><em>Note: In addition to the recognized types listed above, it is also possible to supply a string containing the name of a class (a sub-class of <code>AbstractType</code>), either fully qualified, or relative to the <code>org.apache.cassandra.db.marshal</code> package.</em></p><h3 id
="ColumnFamilyOptionsoptional">Column Family Options (optional)</h3><pre><code>CREATE COLUMNFAMILY ... WITH keyword1 = arg1 AND keyword2 = arg2;
+</code></pre><p>A number of optional keyword arguments can be supplied to control the configuration of a new column family.</p><table><tr><th>keyword</th><th>default</th><th>description</th></tr><tr><td>comparator</td><td>bytes</td><td>Determines sorting and validation of column names. Valid values are identical to the types listed in <a href="#columntypes">Specifying Column Type</a> above.</td></tr><tr><td>comment</td><td>none</td><td>A free-form, human-readable comment.</td></tr><tr><td>row_cache_size</td><td>0</td><td>Number of rows whose entire contents to cache in memory.</td></tr><tr><td>key_cache_size</td><td>200000</td><td>Number of keys per SSTable whose locations are kept in memory in “mostly LRU” order.</td></tr><tr><td>read_repair_chance</td><td>1.0</td><td>The probability with which read repairs should be invoked on non-quorum reads.</td></tr><tr><td>gc_grace_seconds</td><td>864000</td><td>Time to wait before garbage collecting tombstones (deletion m
arkers).</td></tr><tr><td>default_validation</td><td>bytes</td><td>Determines validation of column values. Valid values are identical to the types listed in <a href="#columntypes">Specifying Column Type</a> above.</td></tr><tr><td>min_compaction_threshold</td><td>4</td><td>Minimum number of SSTables needed to start a minor compaction.</td></tr><tr><td>max_compaction_threshold</td><td>32</td><td>Maximum number of SSTables allowed before a minor compaction is forced.</td></tr><tr><td>row_cache_save_period_in_seconds</td><td>0</td><td>Number of seconds between saving row caches.</td></tr><tr><td>key_cache_save_period_in_seconds</td><td>14400</td><td>Number of seconds between saving key caches.</td></tr><tr><td>memtable_flush_after_mins</td><td>60</td><td>Maximum time to leave a dirty table unflushed.</td></tr><tr><td>memtable_throughput_in_mb</td><td>dynamic</td><td>Maximum size of the memtable before it is flushed.</td></tr><tr><td>memtable_operations_in_millions</td><td>dynam
ic</td><td>Number of operations in millions before the memtable is flushed.</td></tr><tr><td>replicate_on_write</td><td>false</td><td></td></tr></table><h2 id="CommonIdioms">Common Idioms</h2><h3 id="consistency">Specifying Consistency</h3><pre><code>... USING <CONSISTENCY> ...
</code></pre><p>Consistency level specifications are made up the keyword <code>USING</code>, followed by a consistency level identifier. Valid consistency levels are as follows:</p><ul><li><code>CONSISTENCY.ZERO</code></li><li><code>CONSISTENCY.ONE</code> (default)</li><li><code>CONSISTENCY.QUORUM</code></li><li><code>CONSISTENCY.ALL</code></li><li><code>CONSISTENCY.DCQUORUM</code></li><li><code>CONSISTENCY.DCQUORUMSYNC</code></li></ul><h3 id="terms">Term specification</h3><p>Where possible, the type of terms are inferred; the following term types are supported:</p><h4 id="string_literals">String Literals</h4><p>String literals are any value enclosed in double-quotes, (`"`). String literals are treated as raw bytes; no interpolation is performed.</p><h4 id="Unicode">Unicode</h4><p>Unicode terms are any double-quoted string prefixed with a lower-case <code>u</code>, for example <code>u"© 2011 The Apache Software Foundation"</code>. Unicode terms are identical to standard
<a href="#string_literals">string literals</a>, with the exception that they are encoded to bytes using the UTF-8 charset.</p><h4 id="Integerslongs">Integers / longs</h4><p>Integers are any term consisting soley of unquoted numericals, longs are any otherwise valid integer term followed by an upper case “L”, (e.g. 100L). It is an error to specify an integer term that will not fit in 4 bytes unsigned, or a long that will not fit in 8 bytes unsigned.</p><h4 id="UUIDs">UUIDs</h4><p>There are two types of UUIDs supported by the CQL specification, time-based (version 1) and randomly generated (version 4). These are specified in statements using the <code>timeuuid(<UUID STRING>)</code> and <code>uuid(<UUID STRING>)</code> notations respectively.</p><p>In addition to the hex-based string representation, <code>timeuuid()</code> terms also accept arguments to specify the data-time component. The full list of <code>timeuuid()</code> arguments are:</p><table><
tr><th>argument</th><th>example</th><th>behavior</th></tr><tr><td>none</td><td>timeuuid()</td><td>Results in the creation of a new UUID based on system time of the node parsing the query.</td></tr><tr><td>now</td><td>timeuuid(“now”)</td><td>Results in the creation of a new UUID based on system time of the node parsing the query.</td></tr><tr><td>milliseconds since epoch</td><td>timeuuid(1296755320376)</td><td>Creates a UUID with a time component that is based on the supplied time-stamp.</td></tr><tr><td><a href="http://en.wikipedia.org/wiki/8601">iso8601 timestamp</a></td><td>timeuuid(“2011-02-01T14:00-0600”)</td><td>Creates a UUID with a time component that is based on the supplied time-stamp.</td></tr><tr><td><a href="http://tools.ietf.org/html/rfc4122">string representation (hex)</a></td><td>timeuuid(“e9229b24-2fbe-11e0-a4de-0026c650d722”)</td><td>Reproduces the specified version 1 UUID node-side.</td></tr></table></body></html>
\ No newline at end of file
Modified: cassandra/trunk/doc/cql/CQL.textile
URL: http://svn.apache.org/viewvc/cassandra/trunk/doc/cql/CQL.textile?rev=1070573&r1=1070572&r2=1070573&view=diff
==============================================================================
--- cassandra/trunk/doc/cql/CQL.textile (original)
+++ cassandra/trunk/doc/cql/CQL.textile Mon Feb 14 16:59:51 2011
@@ -175,6 +175,58 @@ The @CREATE KEYSPACE@ statement creates
|strategy_class|yes|Class name to use for managing replica placement. Any of the shipped strategies can be used by specifying the class name relative to org.apache.cassandra.locator, others will need to be fully-qualified and located on the classpath.|
|strategy_options|no|Some strategies require additional arguments which can be supplied by appending the option name to the @strategy_options@ keyword, separated by a colon (@:@). For example, a strategy option of "DC1" with a value of "1" would be specified as @strategy_options:DC1 = "1"@.|
+h2. CREATE COLUMNFAMILY
+
+_Synopsis:_
+
+bc.
+CREATE COLUMNFAMILY <COLUMN FAMILY> [(name1 type, name2 type, ...)] [WITH keyword1 = arg1
+ [AND keyword2 = arg2 [AND ...]]];
+
+@CREATE COLUMNFAMILY@ statements create new column family namespaces under the current keyspace. Valid column family names are strings of alphanumeric characters and underscores, which begin with a letter.
+
+h3(#columntypes). Specifying Column Type (optional)
+
+bc.
+CREATE COLUMNFAMILY <COLUMN FAMILY> (name1 type, name2 type) ...;
+
+It is possible to assign columns a type during column family creation. Columns configured with a type are validated accordingly when a write occurs. Column types are specified as a parenthesized, comma-separated list of column term and type pairs. The list of recognized types are:
+
+|_. type|_. description|
+|bytes|Arbitrary bytes (no validation)|
+|ascii|ASCII character string|
+|utf8|UTF8 encoded string|
+|timeuuid|Type 1 UUID|
+|uuid|Type 4 UUID|
+|int|4-byte integer|
+|long|8-byte long|
+
+_Note: In addition to the recognized types listed above, it is also possible to supply a string containing the name of a class (a sub-class of @AbstractType@), either fully qualified, or relative to the @org.apache.cassandra.db.marshal@ package._
+
+h3. Column Family Options (optional)
+
+bc.
+CREATE COLUMNFAMILY ... WITH keyword1 = arg1 AND keyword2 = arg2;
+
+A number of optional keyword arguments can be supplied to control the configuration of a new column family.
+
+|_. keyword|_. default|_. description|
+|comparator|bytes|Determines sorting and validation of column names. Valid values are identical to the types listed in "Specifying Column Type":#columntypes above.|
+|comment|none|A free-form, human-readable comment.|
+|row_cache_size|0|Number of rows whose entire contents to cache in memory.|
+|key_cache_size|200000|Number of keys per SSTable whose locations are kept in memory in "mostly LRU" order.|
+|read_repair_chance|1.0|The probability with which read repairs should be invoked on non-quorum reads.|
+|gc_grace_seconds|864000|Time to wait before garbage collecting tombstones (deletion markers).|
+|default_validation|bytes|Determines validation of column values. Valid values are identical to the types listed in "Specifying Column Type":#columntypes above.|
+|min_compaction_threshold|4|Minimum number of SSTables needed to start a minor compaction.|
+|max_compaction_threshold|32|Maximum number of SSTables allowed before a minor compaction is forced.|
+|row_cache_save_period_in_seconds|0|Number of seconds between saving row caches.|
+|key_cache_save_period_in_seconds|14400|Number of seconds between saving key caches.|
+|memtable_flush_after_mins|60|Maximum time to leave a dirty table unflushed.|
+|memtable_throughput_in_mb|dynamic|Maximum size of the memtable before it is flushed.|
+|memtable_operations_in_millions|dynamic|Number of operations in millions before the memtable is flushed.|
+|replicate_on_write|false| |
+
h2. Common Idioms
h3(#consistency). Specifying Consistency