Jorge Bay Gondra

<p>We've just released version 3.0.0 of the&nbsp;<a href="https://github.com/datastax/csharp-driver">DataStax C# Driver</a>&nbsp;with support for Apache Cassandra 3.0.</p>

<p>The main focus for this release was to add support for the changes in the schema metadata introduced in Cassandra 3.0 that is used internally by the driver, while maintaining compatibility with earlier versions of Cassandra. Additionally, we added&nbsp;<a href="http://docs.datastax.com/en/drivers/csharp/3.0/html/T_Cassandra_MaterializedViewMetadata.htm">Materialized Views metadata</a>&nbsp;information and introduced a&nbsp;<a href="http://docs.datastax.com/en/drivers/csharp/3.0/html/T_Cassandra_IndexMetadata.htm">new Index metadata API</a>.</p>

<p>The release also includes the following noteworthy improvements.</p>

<h2>Performance Improvements</h2>

<p>We are focused on delivering a great performance under the .NET runtime. On the past months we implemented a series of improvements that allowed us to deliver significantly higher throughput rates compared to v2.7 of the driver:</p>

<ul>
	<li><a href="https://datastax-oss.atlassian.net/browse/CSHARP-244">Message coalescing</a>, making less syscalls in high concurrent scenarios.</li>
	<li><a href="https://datastax-oss.atlassian.net/browse/CSHARP-270">Buffer pooling</a></li>
	<li><a href="https://datastax-oss.atlassian.net/browse/CSHARP-377">Reduce allocations for VOID results</a></li>
	<li><a href="https://datastax-oss.atlassian.net/browse/CSHARP-374">Avoid ConcurrentDictionary.Count calls</a></li>
</ul>

<h2>Linq / Mapper: Inserting Entities with Null Property Values</h2>

<p>We added an option to the Mapper and Linq components to avoid to INSERT&nbsp;<code>null</code>&nbsp;values, to allow you to avoid unnecessary tombstones.</p>

<p><code>mapper.Insert(new User { FirstName = "Jimi", LastName = "Hendrix" }, insertNulls: false);</code></p>

<h2>Default Setting Changes</h2>

<p>We've taken the opportunity of a major version release to revamp the default settings to the recommended values.</p>

<ul>
	<li><a href="https://datastax-oss.atlassian.net/browse/CSHARP-362">Default read timeout to 12 secs</a></li>
	<li><a href="https://datastax-oss.atlassian.net/browse/CSHARP-375">Enable heartbeat by default</a></li>
	<li><a href="https://datastax-oss.atlassian.net/browse/CSHARP-378">Default consistency level to LOCAL_ONE</a></li>
</ul>

<h2>Looking Forward</h2>

<p>Up until now, in the C# driver we were using version numbers to denote compatibility with Apache Cassandra. This is a good way to avoid doubts about which driver versions supported Cassandra versions but it constrained us to deliver major/breaking changes to the driver API independently from Cassandra.</p>

<p>For future versions, we decided to move to pure&nbsp;<a href="http://semver.org/">semantic versioning</a>.</p>

<p>As you may already know, when adding support for newer Cassandra / DSE versions in the C# driver, compatibility with earlier Cassandra versions were always maintained. This will continue to be the case.</p>

<p>Your feedback is important to us and it influences our priorities. To provide feedback use the following:</p>

<ul>
	<li><a href="https://groups.google.com/a/lists.datastax.com/forum/#!forum/csharp-driver-user">Mailing list</a></li>
	<li>IRC: #datastax-drivers on irc.freenode.net</li>
	<li><a href="https://github.com/datastax/csharp-driver">Review and contribute source code on GitHub</a></li>
	<li><a href="https://datastax-oss.atlassian.net/projects/CSHARP/issues">Report issues on JIRA</a></li>
</ul>

<p><a href="https://www.nuget.org/packages/CassandraCSharpDriver">Version 3.0.0 of the DataStax C# driver is now available on Nuget</a>.</p>


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