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<h2><a href="/blog">Apache Kudu Blog</a></h2>
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<h1 class="entry-title">Apache Kudu (incubating) Weekly Update May 23, 2016</h1>
<p class="meta">Posted 23 May 2016 by Todd Lipcon</p>
<div class="entry-content">
<p>Welcome to the tenth edition of the Kudu Weekly Update. This weekly blog post
covers ongoing development and news in the Apache Kudu (incubating) project.</p>
<p>If you find this post useful, please let us know by emailing the
<a href="">kudu-user mailing list</a> or
tweeting at <a href="">@ApacheKudu</a>. Similarly, if you’re
aware of some Kudu news we missed, let us know so we can cover it in
a future post.</p>
<h2 id="kudu-related-podcast">Kudu related podcast</h2>
<li>Two committers, Mike Percy and Dan Burkert, appeared on the
<a href="">IBM New Builders podcast</a>
to talk about Apache Kudu, how they got involved, and what sort of
workloads it is best suited for.</li>
<h2 id="development-discussions-and-code-in-progress">Development discussions and code in progress</h2>
<p>Jean-Daniel Cryans is again acting as the release manager for the upcoming
0.9.0 release. The git branch for 0.9 has now been cut, and only bug fixes
or small improvements will be committed to that branch between now and the
first release candidate.</p>
<p>Since Kudu’s initial release, one of the most commonly requested features
has been support for the <code class="language-plaintext highlighter-rouge">UPSERT</code> operation. <code class="language-plaintext highlighter-rouge">UPSERT</code>, known in some other
databases as <code class="language-plaintext highlighter-rouge">INSERT ... ON DUPLICATE KEY UPDATE</code>. This operation has the
semantics of an <code class="language-plaintext highlighter-rouge">INSERT</code> if no key already exists with the provided primary
key. Otherwise, it replaces the existing row with the new values.</p>
<p>This week, several developers collaborated to add support for this operation.
Todd Lipcon implemented
<a href="">support on the server side</a>,
C++ client, and <a href="">Python client</a>.
Jean-Daniel Cryans added support in the
<a href="">Java client</a>. Ara Ebrahimi
and Will Berkeley have started working on
<a href="">integrating upsert support into the Flume sink</a>.</p>
<p>Mike Percy started working on support for <a href="">basic disk
space reservations</a>
in the tablet server. This feature will cause the tablet server to stop
writing to a disk before it’s full, preventing crashes due to running
out of space.</p>
<p>Chris George and Andy Grove collaborated on support for <a href="">insertions and
updates in the Spark DataSource</a>,
and the patch was committed towards the end of the week. Brent Gardner
has also been helping with the Spark integration, and fixed an important
<a href="">connection leak bug</a>
in the initial implementation.</p>
<p>David Alves worked on reviving a 7-month old patch by Jingkai Yuan which
implements a <a href="">integer delta encoding scheme</a>
that is meant to be efficient both in terms of CPU and disk space. This
encoding scheme is also designed to take advantage of modern CPU instruction sets
such as AVX and AVX2.</p>
<h2 id="upcoming-talks-and-meetups">Upcoming talks and meetups</h2>
<li>Ryan Bosshart will be presenting Kudu at the <a href="">Dallas/Fort Worth
Cloudera User Group</a>.</li>
<div class="col-lg-3 recent-posts">
<h3>Recent posts</h3>
<li> <a href="/2020/07/30/building-near-real-time-big-data-lake.html">Building Near Real-time Big Data Lake</a> </li>
<li> <a href="/2020/05/18/apache-kudu-1-12-0-release.html">Apache Kudu 1.12.0 released</a> </li>
<li> <a href="/2019/11/20/apache-kudu-1-11-1-release.html">Apache Kudu 1.11.1 released</a> </li>
<li> <a href="/2019/11/20/apache-kudu-1-10-1-release.html">Apache Kudu 1.10.1 released</a> </li>
<li> <a href="/2019/07/09/apache-kudu-1-10-0-release.html">Apache Kudu 1.10.0 Released</a> </li>
<li> <a href="/2019/04/30/location-awareness.html">Location Awareness in Kudu</a> </li>
<li> <a href="/2019/04/22/fine-grained-authorization-with-apache-kudu-and-impala.html">Fine-Grained Authorization with Apache Kudu and Impala</a> </li>
<li> <a href="/2019/03/19/testing-apache-kudu-applications-on-the-jvm.html">Testing Apache Kudu Applications on the JVM</a> </li>
<li> <a href="/2019/03/15/apache-kudu-1-9-0-release.html">Apache Kudu 1.9.0 Released</a> </li>
<li> <a href="/2019/03/05/transparent-hierarchical-storage-management-with-apache-kudu-and-impala.html">Transparent Hierarchical Storage Management with Apache Kudu and Impala</a> </li>
<li> <a href="/2018/12/11/call-for-posts.html">Call for Posts</a> </li>
<li> <a href="/2018/10/26/apache-kudu-1-8-0-released.html">Apache Kudu 1.8.0 Released</a> </li>
<li> <a href="/2018/09/26/index-skip-scan-optimization-in-kudu.html">Index Skip Scan Optimization in Kudu</a> </li>
<li> <a href="/2018/09/11/simplified-pipelines-with-kudu.html">Simplified Data Pipelines with Kudu</a> </li>
<li> <a href="/2018/08/06/getting-started-with-kudu-an-oreilly-title.html">Getting Started with Kudu - an O'Reilly Title</a> </li>
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