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| <h1 class="entry-title">Apache Kudu (incubating) Weekly Update April 25, 2016</h1> |
| <p class="meta">Posted 25 Apr 2016 by Todd Lipcon</p> |
| </header> |
| <div class="entry-content"> |
| <p>Welcome to the sixth edition of the Kudu Weekly Update. This weekly blog post |
| covers ongoing development and news in the Apache Kudu (incubating) project.</p> |
| |
| <!--more--> |
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| <p>If you find this post useful, please let us know by emailing the |
| <a href="mailto:user@kudu.incubator.apache.org">kudu-user mailing list</a> or |
| tweeting at <a href="https://twitter.com/ApacheKudu">@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="development-discussions-and-code-in-progress">Development discussions and code in progress</h2> |
| |
| <ul> |
| <li> |
| <p>Chris George continued to iterate on his |
| <a href="http://gerrit.cloudera.org:8080/#/c/2848/">improved Spark DataSource implementation for Kudu</a>. |
| Chris reports that basic functionality like pushing down predicates |
| is now working properly, and the main work remaining is around |
| writing automated tests.</p> |
| </li> |
| <li> |
| <p>Dan Burkert finished the implementation of the Scan Token API described |
| in previous weeks’ blog posts. Both |
| <a href="http://gerrit.cloudera.org:8080/#/c/2592/">Java</a> and |
| <a href="http://gerrit.cloudera.org:8080/#/c/2757/">C++</a> implementations |
| were committed this past week, and will be available in the upcoming |
| 0.9.0 release.</p> |
| </li> |
| <li> |
| <p>Todd Lipcon committed a five-patch series implementing many of the |
| ideas listed in <a href="https://issues.apache.org/jira/browse/KUDU-1410">KUDU-1410</a>. |
| This new set of improvements will make it easier for operators and |
| developers to diagnose performance issues and timeouts in Kudu clusters.</p> |
| |
| <p>Look out for an upcoming blog post about this new feature.</p> |
| </li> |
| <li> |
| <p>Mike Percy has spent the last couple of weeks working on |
| <a href="https://issues.apache.org/jira/browse/KUDU-1377">KUDU-1377</a>, a subtle |
| issue where various types of disk drive errors or system |
| crashes could cause the Kudu tablet server to be unable to properly |
| recover. This week he committed the |
| <a href="http://gerrit.cloudera.org:8080/#/c/2595/">final patch</a> in this series |
| which should prevent the issue in the future.</p> |
| </li> |
| <li> |
| <p>For the last couple of months, Binglin Chang has been working on and off |
| on a new <a href="https://issues.apache.org/jira/browse/KUDU-1235">Get API</a> for |
| Kudu. The purpose of this new API is to provide an optimized path for |
| looking up a single row.</p> |
| |
| <p>Binglin has been working with Todd on analyzing where CPU time is spent |
| in these code paths, and in initial prototypes has achieved a significant |
| speedup on single-server tests: up to around 90K random reads per |
| second compared to a starting point of around 35K with the current |
| Scan API.</p> |
| </li> |
| <li> |
| <p>Currently, Kudu provides the ability to read at any arbitrary point in the past. |
| Some would consider this a feature, and others would consider it a bug – |
| namely, Kudu never reclaims space from deleted rows.</p> |
| |
| <p>Mike Percy posted an initial <a href="http://gerrit.cloudera.org:8080/#/c/2853/">design document</a> |
| for garbage collection deleted rows and past versions of updated rows.</p> |
| </li> |
| <li> |
| <p>Dan Burkert started working on the implementation of the |
| <a href="http://gerrit.cloudera.org:8080/#/c/2772/">non-covering range partitions</a> |
| feature that was first mentioned last week. A |
| <a href="http://gerrit.cloudera.org:8080/#/c/2806/">first patch</a> starts implementing |
| the master side of the feature.</p> |
| </li> |
| <li> |
| <p>Zhen Zhang posted an initial patch for <a href="https://issues.apache.org/jira/browse/KUDU-1415">KUDU-1415</a>, |
| a new feature that proposes to collect basic operation statistics in the Java client. |
| This would include things such as the number of operations, number of bytes read and |
| written, etc. Jean-Daniel Cryans has already provided a first pass review.</p> |
| </li> |
| </ul> |
| |
| <h2 id="on-the-kudu-blog">On the Kudu blog</h2> |
| |
| <ul> |
| <li>Dan Burkert wrote a post about <a href="http://kudu.apache.org/2016/04/19/kudu-0-8-0-predicate-improvements.html">improvements to predicate handling in |
| Kudu 0.8</a>.</li> |
| </ul> |
| |
| </div> |
| </article> |
| |
| |
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| <div class="col-lg-3 recent-posts"> |
| <h3>Recent posts</h3> |
| <ul> |
| |
| <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> |
| |
| </ul> |
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