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| <h1 class="entry-title">Apache Kudu Weekly Update August 16th, 2016</h1> |
| <p class="meta">Posted 16 Aug 2016 by Todd Lipcon</p> |
| </header> |
| <div class="entry-content"> |
| <p>Welcome to the twentieth 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> |
| <p>The first release candidate for the 0.10.0 is <a href="http://mail-archives.apache.org/mod_mbox/incubator-kudu-dev/201608.mbox/%3CCADY20s7U5jVpozFg3L%3DDz2%2B4AenGineJvH96A_HAM12biDjPJA%40mail.gmail.com%3E">now available</a></p> |
| |
| <p>Community developers and users are encouraged to download the source |
| tarball and vote on the release.</p> |
| |
| <p>For information on what’s new, check out the |
| <a href="https://github.com/apache/kudu/blob/master/docs/release_notes.adoc#rn_0.10.0">release notes</a>. |
| <em>Note:</em> some links from these in-progress release notes will not be live until the |
| release itself is published.</p> |
| </li> |
| </ul> |
| |
| <h2 id="development-discussions-and-code-in-progress">Development discussions and code in progress</h2> |
| |
| <ul> |
| <li> |
| <p>Will Berkeley spent some time working on the Spark integration this week |
| to add support for UPSERT as well as other operations. |
| Dan Burkert pitched in a bit with some <a href="http://mail-archives.apache.org/mod_mbox/incubator-kudu-dev/201608.mbox/%3CCALo2W-XBoSz9cbhXi81ipubrAYgqyDiEeHz-ys8sPAshfcik6w%40mail.gmail.com%3E">suggestions</a> |
| which were then integrated in a <a href="https://gerrit.cloudera.org/#/c/3871/">patch</a> |
| provided by Will.</p> |
| |
| <p>After some reviews by Dan, Chris George, and Ram Mettu, the patch was committed |
| in time for the upcoming 0.10.0 release.</p> |
| </li> |
| <li> |
| <p>Dan Burkert also completed work for the new <a href="https://gerrit.cloudera.org/#/c/3854/">manual partitioning APIs</a> |
| in the Java client. After finishing up the basic implementation, Dan also made some |
| cleanups to the related APIs in both the <a href="https://gerrit.cloudera.org/#/c/3958/">Java</a> |
| and <a href="https://gerrit.cloudera.org/#/c/3882/">C++</a> clients.</p> |
| |
| <p>Dan and Misty Stanley-Jones also collaborated to finish the |
| <a href="https://gerrit.cloudera.org/#/c/3796/">documentation</a> |
| for this new feature.</p> |
| </li> |
| <li> |
| <p>Adar Dembo worked on some tooling to allow users to migrate their Kudu clusters |
| from a single-master configuration to a multi-master one. Along the way, he |
| started building some common infrastructure for command-line tooling.</p> |
| |
| <p>Since Kudu’s initial release, it has included separate binaries for different |
| administrative or operational tools (e.g. <code class="language-plaintext highlighter-rouge">kudu-ts-cli</code>, <code class="language-plaintext highlighter-rouge">kudu-ksck</code>, <code class="language-plaintext highlighter-rouge">kudu-fs_dump</code>, |
| <code class="language-plaintext highlighter-rouge">log-dump</code>, etc). Despite having similar usage, these tools don’t share much code, |
| and the separate statically linked binaries make the Kudu packages take more disk |
| space than strictly necessary.</p> |
| |
| <p>Adar’s work has introduced a new top-level <code class="language-plaintext highlighter-rouge">kudu</code> binary which exposes a set of subcommands, |
| much like the <code class="language-plaintext highlighter-rouge">git</code> and <code class="language-plaintext highlighter-rouge">docker</code> binaries with which readers may be familiar. |
| For example, a new tool he has built for dumping peer identifiers from a tablet’s |
| consensus metadata is triggered using <code class="language-plaintext highlighter-rouge">kudu tablet cmeta print_replica_uuids</code>.</p> |
| |
| <p>This new tool will be available in the upcoming 0.10.0 release; however, migration |
| of the existing tools to the new infrastructure has not yet been completed. We |
| expect that by Kudu 1.0, the old tools will be removed in favor of more subcommands |
| of the <code class="language-plaintext highlighter-rouge">kudu</code> tool.</p> |
| </li> |
| <li> |
| <p>Todd Lipcon picked up the work started by David Alves in July to provide |
| <a href="https://gerrit.cloudera.org/#/c/2642/">“exactly-once” semantics</a> for write operations. |
| Todd carried the patch series through review and also completed integration of the |
| feature into the Kudu server processes.</p> |
| |
| <p>After testing the feature for several days on a large cluster under load, |
| the team decided to enable this new feature by default in Kudu 0.10.0.</p> |
| </li> |
| <li> |
| <p>Mike Percy resumed working on garbage collection of <a href="https://gerrit.cloudera.org/#/c/2853/">past versions of |
| updated and deleted rows</a>. His <a href="https://gerrit.cloudera.org/#/c/3076/">main |
| patch for the feature</a> went through |
| several rounds of review and testing, but unfortunately missed the cut-off |
| for 0.10.0.</p> |
| </li> |
| <li> |
| <p>Alexey Serbin’s work to add doxygen-based documentation for the C++ Client API |
| was <a href="https://gerrit.cloudera.org/#/c/3840/">committed</a> this week. These |
| docs will be published as part of the 0.10.0 release.</p> |
| </li> |
| <li> |
| <p>Alexey also continued work on implementing the <code class="language-plaintext highlighter-rouge">AUTO_FLUSH_BACKGROUND</code> write |
| mode for the C++ client. This feature makes it easier to implement high-throughput |
| ingest using the C++ API by automatically handling the batching and flushing of writes |
| based on a configurable buffer size.</p> |
| |
| <p>Alexey’s <a href="https://gerrit.cloudera.org/#/c/3952/">patch</a> has received several |
| rounds of review and looks likely to be committed soon. Detailed performance testing |
| will follow.</p> |
| </li> |
| <li> |
| <p>Congratulations to Ram Mettu for committing his first patch to Kudu this week! |
| Ram fixed a <a href="https://issues.apache.org/jira/browse/KUDU-1522">bug in handling Alter Table with TIMESTAMP columns</a>.</p> |
| </li> |
| </ul> |
| |
| <h2 id="upcoming-talks">Upcoming talks</h2> |
| |
| <ul> |
| <li>Mike Percy will be speaking about Kudu this Wednesday at the |
| <a href="http://www.meetup.com/Denver-Cloudera-User-Group/events/232782782/">Denver Cloudera User Group</a> |
| and on Thursday at the |
| <a href="http://www.meetup.com/Boulder-Denver-Big-Data/events/232056701/">Boulder/Denver Big Data Meetup</a>. |
| If you’re based in the Boulder/Denver area, be sure not to miss these talks!</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.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> |
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