2016/07/26/weekly-update.html - kudu-site - Git at Google

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     <h1 class="entry-title">Apache Kudu Weekly Update July 26, 2016</h1>
     <p class="meta">Posted 26 Jul 2016 by Jean-Daniel Cryans</p>
   </header>
   <div class="entry-content">
     <p>Welcome to the eighteenth edition of the Kudu Weekly Update. This weekly blog post
 covers ongoing development and news in the Apache Kudu project.</p>

 <!--more-->

 <h2 id="project-news">Project news</h2>

 <ul>
   <li>Kudu has graduated from the Apache Incubator and is now a Top-Level Project! All the details
 are in this <a href="http://kudu.apache.org/2016/07/25/asf-graduation.html">blog post</a>.
 Mike Percy and Todd Lipcon made a few updates to the website to reflect the project’s
 new name and status.</li>
 </ul>

 <h2 id="development-discussions-and-code-in-progress">Development discussions and code in progress</h2>

 <ul>
   <li>
     <p>Dan Burkert contributed a few patches that repackage the Java client under <code class="highlighter-rouge">org.apache.kudu</code>
 in place of <code class="highlighter-rouge">org.kududb</code>. This was done in a <strong>backward-incompatible</strong> way, meaning that import
 statements will have to be modified in existing Java code to compile against a newer Kudu JAR
 version (from 0.10.0 onward). This stems from <a href="http://mail-archives.apache.org/mod_mbox/kudu-dev/201605.mbox/%3CCAGpTDNcJohQBgjzXafXJQdqmBB4sL495p5V_BJRXk_nAGWbzhA@mail.gmail.com%3E">a discussion</a>
 initiated in May. It won’t have an impact on C++ or Python users, and it isn’t affecting wire
 compatibility.</p>
   </li>
   <li>
     <p>Still on the Java-side, J-D Cryans pushed <a href="https://gerrit.cloudera.org/#/c/3055/">a patch</a>
 that completely changes how Exceptions are managed. Before this change, users had to introspect
 generic Exception objects, making it a guessing game and discouraging good error handling.
 Now, the synchronous client’s methods throw <code class="highlighter-rouge">KuduException</code> which packages a <code class="highlighter-rouge">Status</code> object
 that can be interrogated. This is very similar to how the C++ API works.</p>

     <p>Existing code that uses the new Kudu JAR should still compile since this change replaces generic
 <code class="highlighter-rouge">Exception</code> with a more specific <code class="highlighter-rouge">KuduException</code>. Error handling done by string-matching the
 exception messages should now use the provided <code class="highlighter-rouge">Status</code> object.</p>
   </li>
   <li>
     <p>Alexey Serbin’s <a href="https://gerrit.cloudera.org/#/c/3619/">patch</a> that adds Doxygen-based
 documentation was pushed and the new API documentation for C++ developers will be available
 with the next release.</p>
   </li>
   <li>
     <p>Todd has made many improvements to the <code class="highlighter-rouge">ksck</code> tool over the last week. Building upon Will
 Berkeley’s <a href="https://gerrit.cloudera.org/#/c/3632/">WIP patch for KUDU-1516</a>, <code class="highlighter-rouge">ksck</code> can
 now detect more problematic situations like if a tablet doesn’t have a majority of replicas on
 live tablet servers, or if those replicas aren’t in a good state.
 <code class="highlighter-rouge">ksck</code> is also <a href="https://gerrit.cloudera.org/#/c/3705/">now faster</a> when run against a large
 cluster with a lot of tablets, among other improvements.</p>
   </li>
   <li>
     <p>As mentioned last week, Dan has been working on <a href="https://gerrit.cloudera.org/#/c/3648/">adding add/remove range partition support</a>
 in the C++ client and in the master. The patch has been through many rounds of review and
 testing and it’s getting close to completion. Meanwhile, J-D started looking at adding support
 for this functionality in the <a href="https://gerrit.cloudera.org/#/c/3731/">Java client</a>.</p>
   </li>
   <li>
     <p>Adar Dembo is also hard at work on the master. The <a href="https://gerrit.cloudera.org/#/c/3609/">series</a>
 <a href="https://gerrit.cloudera.org/#/c/3610/">of</a> <a href="https://gerrit.cloudera.org/#/c/3611/">patches</a> to
 have the tablet servers heartbeat to all the masters that he published earlier this month is
 getting near the finish line.</p>
   </li>
 </ul>

 <p>Want to learn more about a specific topic from this blog post? Shoot an email to the
 <a href="&#109;&#097;&#105;&#108;&#116;&#111;:&#117;&#115;&#101;&#114;&#064;&#107;&#117;&#100;&#117;&#046;&#105;&#110;&#099;&#117;&#098;&#097;&#116;&#111;&#114;&#046;&#097;&#112;&#097;&#099;&#104;&#101;&#046;&#111;&#114;&#103;">kudu-user mailing list</a> or
 tweet 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>

   </div>
 </article>


   </div>
   <div class="col-lg-3 recent-posts">
     <h3>Recent posts</h3>
     <ul>

       <li> <a href="/2016/08/31/intro-flume-kudu-sink.html">An Introduction to the Flume Kudu Sink</a> </li>

       <li> <a href="/2016/08/23/new-range-partitioning-features.html">New Range Partitioning Features in Kudu 0.10</a> </li>

       <li> <a href="/2016/08/23/apache-kudu-0-10-0-released.html">Apache Kudu 0.10.0 released</a> </li>

       <li> <a href="/2016/08/16/weekly-update.html">Apache Kudu Weekly Update August 16th, 2016</a> </li>

       <li> <a href="/2016/08/08/weekly-update.html">Apache Kudu Weekly Update August 8th, 2016</a> </li>

       <li> <a href="/2016/07/26/weekly-update.html">Apache Kudu Weekly Update July 26, 2016</a> </li>

       <li> <a href="/2016/07/25/asf-graduation.html">The Apache Software Foundation Announces Apache&reg; Kudu&trade; as a Top-Level Project</a> </li>

       <li> <a href="/2016/07/18/weekly-update.html">Apache Kudu (incubating) Weekly Update July 18, 2016</a> </li>

       <li> <a href="/2016/07/11/weekly-update.html">Apache Kudu (incubating) Weekly Update July 11, 2016</a> </li>

       <li> <a href="/2016/07/01/apache-kudu-0-9-1-released.html">Apache Kudu (incubating) 0.9.1 released</a> </li>

       <li> <a href="/2016/06/27/weekly-update.html">Apache Kudu (incubating) Weekly Update June 27, 2016</a> </li>

       <li> <a href="/2016/06/24/multi-master-1-0-0.html">Master fault tolerance in Kudu 1.0</a> </li>

       <li> <a href="/2016/06/21/weekly-update.html">Apache Kudu (incubating) Weekly Update June 21, 2016</a> </li>

       <li> <a href="/2016/06/17/raft-consensus-single-node.html">Using Raft Consensus on a Single Node</a> </li>

       <li> <a href="/2016/06/13/weekly-update.html">Apache Kudu (incubating) Weekly Update June 13, 2016</a> </li>

     </ul>
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	<header>
	<h1 class="entry-title">Apache Kudu Weekly Update July 26, 2016</h1>
	<p class="meta">Posted 26 Jul 2016 by Jean-Daniel Cryans</p>
	</header>
	<div class="entry-content">
	<p>Welcome to the eighteenth edition of the Kudu Weekly Update. This weekly blog post
	covers ongoing development and news in the Apache Kudu project.</p>

	<!--more-->

	<h2 id="project-news">Project news</h2>

	<ul>
	<li>Kudu has graduated from the Apache Incubator and is now a Top-Level Project! All the details
	are in this <a href="http://kudu.apache.org/2016/07/25/asf-graduation.html">blog post</a>.
	Mike Percy and Todd Lipcon made a few updates to the website to reflect the project’s
	new name and status.</li>
	</ul>

	<h2 id="development-discussions-and-code-in-progress">Development discussions and code in progress</h2>

	<ul>
	<li>
	<p>Dan Burkert contributed a few patches that repackage the Java client under <code class="highlighter-rouge">org.apache.kudu</code>
	in place of <code class="highlighter-rouge">org.kududb</code>. This was done in a <strong>backward-incompatible</strong> way, meaning that import
	statements will have to be modified in existing Java code to compile against a newer Kudu JAR
	version (from 0.10.0 onward). This stems from <a href="http://mail-archives.apache.org/mod_mbox/kudu-dev/201605.mbox/%3CCAGpTDNcJohQBgjzXafXJQdqmBB4sL495p5V_BJRXk_nAGWbzhA@mail.gmail.com%3E">a discussion</a>
	initiated in May. It won’t have an impact on C++ or Python users, and it isn’t affecting wire
	compatibility.</p>
	</li>
	<li>
	<p>Still on the Java-side, J-D Cryans pushed <a href="https://gerrit.cloudera.org/#/c/3055/">a patch</a>
	that completely changes how Exceptions are managed. Before this change, users had to introspect
	generic Exception objects, making it a guessing game and discouraging good error handling.
	Now, the synchronous client’s methods throw <code class="highlighter-rouge">KuduException</code> which packages a <code class="highlighter-rouge">Status</code> object
	that can be interrogated. This is very similar to how the C++ API works.</p>

	<p>Existing code that uses the new Kudu JAR should still compile since this change replaces generic
	<code class="highlighter-rouge">Exception</code> with a more specific <code class="highlighter-rouge">KuduException</code>. Error handling done by string-matching the
	exception messages should now use the provided <code class="highlighter-rouge">Status</code> object.</p>
	</li>
	<li>
	<p>Alexey Serbin’s <a href="https://gerrit.cloudera.org/#/c/3619/">patch</a> that adds Doxygen-based
	documentation was pushed and the new API documentation for C++ developers will be available
	with the next release.</p>
	</li>
	<li>
	<p>Todd has made many improvements to the <code class="highlighter-rouge">ksck</code> tool over the last week. Building upon Will
	Berkeley’s <a href="https://gerrit.cloudera.org/#/c/3632/">WIP patch for KUDU-1516</a>, <code class="highlighter-rouge">ksck</code> can
	now detect more problematic situations like if a tablet doesn’t have a majority of replicas on
	live tablet servers, or if those replicas aren’t in a good state.
	<code class="highlighter-rouge">ksck</code> is also <a href="https://gerrit.cloudera.org/#/c/3705/">now faster</a> when run against a large
	cluster with a lot of tablets, among other improvements.</p>
	</li>
	<li>
	<p>As mentioned last week, Dan has been working on <a href="https://gerrit.cloudera.org/#/c/3648/">adding add/remove range partition support</a>
	in the C++ client and in the master. The patch has been through many rounds of review and
	testing and it’s getting close to completion. Meanwhile, J-D started looking at adding support
	for this functionality in the <a href="https://gerrit.cloudera.org/#/c/3731/">Java client</a>.</p>
	</li>
	<li>
	<p>Adar Dembo is also hard at work on the master. The <a href="https://gerrit.cloudera.org/#/c/3609/">series</a>
	<a href="https://gerrit.cloudera.org/#/c/3610/">of</a> <a href="https://gerrit.cloudera.org/#/c/3611/">patches</a> to
	have the tablet servers heartbeat to all the masters that he published earlier this month is
	getting near the finish line.</p>
	</li>
	</ul>

	<p>Want to learn more about a specific topic from this blog post? Shoot an email to the
	<a href="mailto:user@kudu.incubator.apache.org">kudu-user mailing list</a> or
	tweet 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>

	</div>
	</article>


	</div>
	<div class="col-lg-3 recent-posts">
	<h3>Recent posts</h3>
	<ul>

	<li> <a href="/2016/08/31/intro-flume-kudu-sink.html">An Introduction to the Flume Kudu Sink</a> </li>

	<li> <a href="/2016/08/23/new-range-partitioning-features.html">New Range Partitioning Features in Kudu 0.10</a> </li>

	<li> <a href="/2016/08/23/apache-kudu-0-10-0-released.html">Apache Kudu 0.10.0 released</a> </li>

	<li> <a href="/2016/08/16/weekly-update.html">Apache Kudu Weekly Update August 16th, 2016</a> </li>

	<li> <a href="/2016/08/08/weekly-update.html">Apache Kudu Weekly Update August 8th, 2016</a> </li>

	<li> <a href="/2016/07/26/weekly-update.html">Apache Kudu Weekly Update July 26, 2016</a> </li>

	<li> <a href="/2016/07/25/asf-graduation.html">The Apache Software Foundation Announces Apache® Kudu™ as a Top-Level Project</a> </li>

	<li> <a href="/2016/07/18/weekly-update.html">Apache Kudu (incubating) Weekly Update July 18, 2016</a> </li>

	<li> <a href="/2016/07/11/weekly-update.html">Apache Kudu (incubating) Weekly Update July 11, 2016</a> </li>

	<li> <a href="/2016/07/01/apache-kudu-0-9-1-released.html">Apache Kudu (incubating) 0.9.1 released</a> </li>

	<li> <a href="/2016/06/27/weekly-update.html">Apache Kudu (incubating) Weekly Update June 27, 2016</a> </li>

	<li> <a href="/2016/06/24/multi-master-1-0-0.html">Master fault tolerance in Kudu 1.0</a> </li>

	<li> <a href="/2016/06/21/weekly-update.html">Apache Kudu (incubating) Weekly Update June 21, 2016</a> </li>

	<li> <a href="/2016/06/17/raft-consensus-single-node.html">Using Raft Consensus on a Single Node</a> </li>

	<li> <a href="/2016/06/13/weekly-update.html">Apache Kudu (incubating) Weekly Update June 13, 2016</a> </li>

	</ul>
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