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| <h1 class="entry-title">Apache Kudu (incubating) Weekly Update March 21, 2016</h1> |
| <p class="meta">Posted 20 Mar 2016 by Todd Lipcon</p> |
| </header> |
| <div class="entry-content"> |
| <p>Kudu is a fast-moving young open source project, and we’ve heard from a few |
| members of the community that it can be difficult to keep track of what’s |
| going on day-to-day. A typical month comprises 80-100 individual patches |
| committed and hundreds of code review and discussion |
| emails. So, inspired by similar weekly newsletters like |
| <a href="http://llvmweekly.org/">LLVM Weekly</a> and <a href="http://lwn.net/Kernel/">LWN’s weekly kernel coverage</a> |
| we’re going to experiment with our own weekly newsletter covering |
| recent development and Kudu-related news. |
| <!--more--></p> |
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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</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="news-and-articles-from-around-the-web">News and articles from around the web</h2> |
| |
| <ul> |
| <li>Apache Kudu (incubating) 0.7.1 was released last week, and this week |
| Cloudera announced that its |
| <a href="http://www.cloudera.com/documentation/betas/kudu/latest/topics/kudu_installation.html">Kudu 0.7.1 binaries</a> |
| are now available.</li> |
| <li>The Ibis open source project <a href="http://blog.ibis-project.org/release-0.7/">released version 0.7.0</a> |
| which includes support for querying Kudu. <a href="http://blog.ibis-project.org/kudu-impala-ibis/">An earlier post</a> |
| shows an example of the Ibis-Kudu integration in action.</li> |
| </ul> |
| |
| <h2 id="development-discussions-and-code-in-progress">Development discussions and code in progress</h2> |
| |
| <ul> |
| <li> |
| <p>Since the first public release, Kudu has had some experimental support for high-availability |
| master processes. Adar Dembo has started some work identifying the current gaps that make it |
| experimental and outlining some plans to stabilize it enough for reliable production use. |
| This week he posted a <a href="http://gerrit.cloudera.org:8080/#/c/2527/">design doc</a> as well as |
| some <a href="http://gerrit.cloudera.org:8080/#/c/2583/">analysis of CatalogManager code paths</a>.</p> |
| </li> |
| <li> |
| <p>David Alves kicked off a <a href="http://markmail.org/message/p4njqwkls7di7aoa">discussion about version numbers for the Python client</a>. |
| The discussion trailed off with some general agreement that the Python client would |
| keep to its own version numbering scheme for the time being, rather than being tied |
| to specific Kudu versions.</p> |
| </li> |
| <li> |
| <p>Binglin Chang’s patch for <a href="http://gerrit.cloudera.org:8080/#/c/2327/">per-tablet write quotas</a> |
| and associated throttling passed review and should be committed soon. This adds a very basic |
| throttling mechanism that can provide for some basic isolation and capacity planning for |
| multi-tenant clusters. It will be considered an experimental feature in the 0.8.0 release.</p> |
| </li> |
| <li> |
| <p>Dan Burkert finished off some patches originally prototyped by Todd Lipcon which add |
| two types of “feature flags” for Kudu’s RPC system. Feature flags are a mechanism by which |
| Kudu clients and servers can expose to one another what specific features they support, |
| enabling better cross-version compatibility. The <a href="http://gerrit.cloudera.org:8080/#/c/2238/">first type of feature flag</a> |
| enumerates the features supported by the RPC system itself. The <a href="http://gerrit.cloudera.org:8080/#/c/2239/">second type</a> |
| are scoped to an individual call, and can be used by a client to assert that the server |
| is new enough to properly interpret requests. The commit messages and code documentation |
| included in these patches give example use cases.</p> |
| </li> |
| <li> |
| <p>Dan also finished off most of a patch series implementing improved partition pruning |
| support. This will help reduce the number of servers that a client must contact when |
| scanning a table with predicates (e.g. by eliminating tablets from a hash-partitioned |
| table when the scanner specifies an equality predicate on the hash-distributed column). |
| More details can be found in the |
| <a href="https://github.com/apache/incubator-kudu/blob/master/docs/design-docs/scan-optimization-partition-pruning.md">partition-pruning design doc</a> |
| as well as the patches (<a href="http://gerrit.cloudera.org:8080/#/c/2137/">1</a>, |
| <a href="http://gerrit.cloudera.org:8080/#/c/2413/">2</a>, |
| <a href="http://gerrit.cloudera.org:8080/#/c/2138/">3</a>).</p> |
| </li> |
| </ul> |
| |
| <h2 id="upcoming-talks-and-meetups">Upcoming talks and meetups</h2> |
| |
| <ul> |
| <li>Dan Burkert will be presenting his work on a |
| <a href="https://github.com/danburkert/kudu-rs">Rust language client library for Kudu</a> |
| at the <a href="http://www.meetup.com/Rust-Bay-Area/events/229107276/">Rust Bay Area</a> meetup.</li> |
| </ul> |
| |
| </div> |
| </article> |
| |
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| </div> |
| <div class="col-lg-3 recent-posts"> |
| <h3>Recent posts</h3> |
| <ul> |
| |
| <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> |
| |
| <li> <a href="/2016/06/10/apache-kudu-0-9-0-released.html">Apache Kudu (incubating) 0.9.0 released</a> </li> |
| |
| <li> <a href="/2016/06/06/weekly-update.html">Apache Kudu (incubating) Weekly Update June 6, 2016</a> </li> |
| |
| <li> <a href="/2016/06/02/no-default-partitioning.html">Default Partitioning Changes Coming in Kudu 0.9</a> </li> |
| |
| <li> <a href="/2016/06/01/weekly-update.html">Apache Kudu (incubating) Weekly Update June 1, 2016</a> </li> |
| |
| <li> <a href="/2016/05/23/weekly-update.html">Apache Kudu (incubating) Weekly Update May 23, 2016</a> </li> |
| |
| <li> <a href="/2016/05/16/weekly-update.html">Apache Kudu (incubating) Weekly Update May 16, 2016</a> </li> |
| |
| <li> <a href="/2016/05/09/weekly-update.html">Apache Kudu (incubating) Weekly Update May 9, 2016</a> </li> |
| |
| <li> <a href="/2016/05/03/weekly-update.html">Apache Kudu (incubating) Weekly Update May 3, 2016</a> </li> |
| |
| <li> <a href="/2016/04/26/ycsb.html">Benchmarking and Improving Kudu Insert Performance with YCSB</a> </li> |
| |
| <li> <a href="/2016/04/25/weekly-update.html">Apache Kudu (incubating) Weekly Update April 25, 2016</a> </li> |
| |
| <li> <a href="/2016/04/19/kudu-0-8-0-predicate-improvements.html">Predicate Improvements in Kudu 0.8</a> </li> |
| |
| </ul> |
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