Author: buildbot
Date: Wed Jan 7 10:20:08 2015
New Revision: 935354
Log:
Production update by buildbot for camel
Added:
websites/production/camel/content/cassandra.html
Modified:
websites/production/camel/content/cache/main.pageCache
Modified: websites/production/camel/content/cache/main.pageCache
==============================================================================
Binary files - no diff available.
Added: websites/production/camel/content/cassandra.html
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--- websites/production/camel/content/cassandra.html (added)
+++ websites/production/camel/content/cassandra.html Wed Jan 7 10:20:08 2015
@@ -0,0 +1,178 @@
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+ Apache Camel: Cassandra
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+<a href="index.html">Apache Camel</a> > <a
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href="cassandra.html">Cassandra</a>
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+<div class="wiki-content maincontent"><p> </p><h1
id="Cassandra-CamelCassandraComponent">Camel Cassandra
Component</h1><p><strong>Available as of Camel 2.15</strong></p><p>Apache
Cassandra is an open source NoSQL database designed to handle large amounts on
commodity hardware. Like Amazon's DynamoDB, Cassandra has a peer-to-peer and
master-less architecture to avoid single point of failure and garanty high
availability. Like Google's BigTable, Cassandra data is structured using column
families which can be accessed through the Thrift RPC API or a SQL-like API
called CQL.</p><p>This component aims at integrating Cassandra 2.0+ using the
CQL3 API (not the Thrift API). It's based on <a shape="rect"
class="external-link" href="https://github.com/datastax/java-driver";
rel="nofollow">Cassandra Java Driver</a> provided by DataStax.</p><p>Maven
users will need to add the following dependency to their <code>pom.xml</code>
for this component:</p><div class="code panel pdl" style="border-
width: 1px;"><div class="codeHeader panelHeader pdl"
style="border-bottom-width: 1px;"><b>pom.xml</b></div><div class="codeContent
panelContent pdl">
+<script class="theme: Default; brush: xml; gutter: false"
type="syntaxhighlighter"><![CDATA[<dependency>
+ <groupId>org.apache.camel</groupId>
+ <artifactId>camel-cassandraql</artifactId>
+ <version>x.y.z</version>
+ <!-- use the same version as your Camel core version -->
+</dependency>]]></script>
+</div></div><h2 id="Cassandra-URIformat">URI format</h2><p>The endpoint can
initiate the Cassandra connection or use an existing one.</p><div
class="table-wrap"><table class="confluenceTable"><thead><tr><th colspan="1"
rowspan="1" class="confluenceTh">URI</th><th colspan="1" rowspan="1"
class="confluenceTh">Description</th></tr></thead><tbody><tr><td colspan="1"
rowspan="1" class="confluenceTd"><code>cql:localhost/keyspace</code></td><td
colspan="1" rowspan="1" class="confluenceTd">Single host, default port, usual
for testing</td></tr><tr><td colspan="1" rowspan="1"
class="confluenceTd"><code>cql:host1,host2/keyspace</code></td><td colspan="1"
rowspan="1" class="confluenceTd">Multi host, default port</td></tr><tr><td
colspan="1" rowspan="1"
class="confluenceTd"><code>cql:host1,host2:9042/keyspace</code></td><td
colspan="1" rowspan="1" class="confluenceTd">Multi host, custom
port</td></tr><tr><td colspan="1" rowspan="1"
class="confluenceTd"><code>cql:host1,host2</code></td><td colspa
n="1" rowspan="1" class="confluenceTd">Default port and
keyspace</td></tr><tr><td colspan="1" rowspan="1"
class="confluenceTd"><code>cql:bean:sessionRef</code></td><td colspan="1"
rowspan="1" class="confluenceTd">Provided Session reference</td></tr><tr><td
colspan="1" rowspan="1"
class="confluenceTd"><code>cql:bean:clusterRef/keyspace</code></td><td
colspan="1" rowspan="1" class="confluenceTd">Provided Cluster
reference</td></tr></tbody></table></div><p>To fine tune the Cassandra
connection (SSL options, pooling options, load balancing policy, retry policy,
reconnection policy...), create your own Cluster instance and give it to the
Camel endpoint.</p><h2 id="Cassandra-EndpointOptions">Endpoint Options</h2><div
class="table-wrap"><table class="confluenceTable"><thead><tr><th colspan="1"
rowspan="1" class="confluenceTh">Option</th><th colspan="1" rowspan="1"
class="confluenceTh">Description</th></tr></thead><tbody><tr><td colspan="1"
rowspan="1" class="confluenceTd"><p>clusterName</p
></td><td colspan="1" rowspan="1" class="confluenceTd"><p>Cluster
>name</p></td></tr><tr><td colspan="1" rowspan="1"
>class="confluenceTd"><p><code>username and password</code></p></td><td
>colspan="1" rowspan="1" class="confluenceTd"><p>Session
>authentication</p></td></tr><tr><td colspan="1" rowspan="1"
>class="confluenceTd"><p><code>cql</code></p></td><td colspan="1" rowspan="1"
>class="confluenceTd"><p>CQL query. Can be overriden with a message
>header.</p></td></tr><tr><td colspan="1" rowspan="1"
>class="confluenceTd"><p><code>consistencyLevel</code></p></td><td colspan="1"
>rowspan="1" class="confluenceTd"><p><code>ANY</code>, <code>ONE</code>,
><code>TWO</code>, <code>QUORUM</code>,
><code>LOCAL_QUORUM</code>...</p></td></tr><tr><td colspan="1" rowspan="1"
>class="confluenceTd"><p><code>resultSetConversionStrategy</code></p></td><td
>colspan="1" rowspan="1" class="confluenceTd"><p>How is ResultSet converted
>transformed into message body <code>ALL</code>, <code>ONE</code>,
><code>LIMIT_10</
code>, <code>LIMIT_100</code>...</p></td></tr></tbody></table></div><h2
id="Cassandra-IncomingMessage">Incoming Message</h2><p>The Camel Cassandra
endpoint expects a bunch of simple objects (Object[] or
Collection<Object>) which will be bound to the CQL statement as query
parameters.</p><p>Headers:</p><ul
class="task-list"><li><code>CamelCqlQuery</code> (optional, String): CQL
query</li></ul><h2 id="Cassandra-OutgoingMessage">Outgoing Message</h2><p>The
Camel Cassandra endpoint produces one or many a Cassandra Row objects depending
on
the resultSetConversionStrategy:</p><p> </p><ul><li><code>List<Row></code>
if resultSetConversionStrategy is ALL or LIMIT_10</li><li><code>Single
Row</code> if resultSetConversionStrategy is ONE</li><li>Anything else, if
resultSetConversionStrategy is a custom implementation of the
ResultSetConversionStrategy</li></ul><h2
id="Cassandra-Repositories">Repositories</h2><p>Cassandra can be used to store
messages or messages for the id
empotent and aggregation EIP.</p><p>Cassandra might not be the best tool for
queuing use cases yet, read <a shape="rect" class="external-link"
href="http://www.datastax.com/dev/blog/cassandra-anti-patterns-queues-and-queue-like-datasets";
rel="nofollow">Cassandra anti-patterns queues and queue like datasets</a>.
It's advised to use LeveledCompaction and a small GC grace setting for these
tables to allow tombstoned rows to be removed quickly.</p><h3
id="Cassandra-Idempotentrepository">Idempotent repository</h3><p>The
NamedCassandraIdempotentRepository stores messages keys in a Cassandra table
like this:</p><div class="code panel pdl" style="border-width: 1px;"><div
class="codeHeader panelHeader pdl" style="border-bottom-width:
1px;"><b>CAMEL_IDEMPOTENT.cql</b></div><div class="codeContent panelContent
pdl">
+<script class="theme: Default; brush: sql; gutter: false"
type="syntaxhighlighter"><![CDATA[CREATE TABLE CAMEL_IDEMPOTENT (
+ NAME varchar, -- Repository name
+ KEY varchar, -- Message key
+ PRIMARY KEY (NAME, KEY)
+);]]></script>
+</div></div><p>The CassandraIdempotentRepository can be extended to use a
different data model.</p><h3 id="Cassandra-Aggregationrepository">Aggregation
repository</h3><p>The name NamedCassandraAggregationRepository stores messages
by correlation key in a Cassandra table like this:</p><div class="code panel
pdl" style="border-width: 1px;"><div class="codeHeader panelHeader pdl"
style="border-bottom-width: 1px;"><b>CAMEL_AGGREGATION.cql</b></div><div
class="codeContent panelContent pdl">
+<script class="theme: Default; brush: sql; gutter: false"
type="syntaxhighlighter"><![CDATA[CREATE TABLE CAMEL_AGGREGATION (
+ NAME varchar, -- Repository name
+ KEY varchar, -- Correlation id
+ EXCHANGE_ID varchar, -- Exchange id
+ EXCHANGE blob, -- Serialized exchange
+ PRIMARY KEY (NAME, KEY)
+);]]></script>
+</div></div><p>The CassandraAggregationRepository can be extended to use a
different data model.</p></div>
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