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| <h1 class="entry-title">Apache Kudu (incubating) Weekly Update June 27, 2016</h1> |
| <p class="meta">Posted 27 Jun 2016 by Todd Lipcon</p> |
| </header> |
| <div class="entry-content"> |
| <p>Welcome to the fifteenth edition of the Kudu Weekly Update. This weekly blog post |
| covers ongoing development and news in the Apache Kudu (incubating) project.</p> |
| |
| <!--more--> |
| |
| <h2 id="development-discussions-and-code-in-progress">Development discussions and code in progress</h2> |
| |
| <ul> |
| <li> |
| <p>Todd Lipcon diagnosed and fixed a <a href="https://gerrit.cloudera.org/3445">tricky bug</a> |
| which could cause Kudu servers to crash under load. It turned out that the bug |
| was in a synchronization profiling code path related to the tcmalloc allocator. |
| This allocator is used in release builds, but can’t be used in instrumented builds |
| such as |
| <a href="http://clang.llvm.org/docs/AddressSanitizer.html">AddressSanitizer</a> or |
| <a href="http://clang.llvm.org/docs/ThreadSanitizer.html">ThreadSanitizer</a>. This made it particularly difficult |
| to catch. The bug fix will be released in the upcoming 0.9.1 release.</p> |
| </li> |
| <li> |
| <p>Todd also finished and committed a fix for <a href="https://issues.apache.org/jira/browse/KUDU-1469">KUDU-1469</a>, |
| a bug in which Kudu’s implementation of Raft consensus could get “stuck” not making |
| progress replicating operations for a tablet. See the |
| <a href="https://gerrit.cloudera.org/#/c/3228/7/src/kudu/integration-tests/raft_consensus-itest.cc">new integration test case</a> |
| for more details on this bug.</p> |
| </li> |
| <li> |
| <p>Mike Percy finished implementing and committed a feature which allows |
| <a href="https://gerrit.cloudera.org/#/c/3135/">reserving disk space for non-Kudu processes</a>. |
| This feature causes Kudu to stop allocating new data blocks on a |
| disk if it is within a user-specified threshold of being full, preventing |
| possible crashes and allowing for safer collocation of Kudu with other processes |
| on a cluster.</p> |
| </li> |
| <li> |
| <p>Will Berkeley finished implementing <a href="https://issues.apache.org/jira/browse/KUDU-1398">KUDU-1398</a>, |
| a new optimization which reduces the amount of disk space used by |
| indexing structures in Kudu’s internal storage format. This should |
| improve storage efficiency for workloads with large keys, and can |
| also improve write performance by increasing the number of index |
| entries which can fit in a given amount of cache memory.</p> |
| </li> |
| <li> |
| <p>David Alves has completed posting a patch series that implements |
| exactly-once RPC semantics. The design, as mentioned in previous |
| blog posts, is described in a <a href="https://gerrit.cloudera.org/#/c/2642/">design document</a> |
| and the patches can be found in a 10-patch series starting with |
| <a href="https://gerrit.cloudera.org/#/c/3190/">gerrit #3190</a>.</p> |
| </li> |
| <li> |
| <p>Dan Burkert is continuing working on adding support for |
| <a href="https://github.com/apache/incubator-kudu/blob/master/docs/design-docs/non-covering-range-partitions.md">tables with range partitions that don’t cover the entire key |
| space</a>. |
| This past week, he focused on adding <a href="https://gerrit.cloudera.org/#/c/3388/">support in the the Java client</a> |
| which also necessitated some serious <a href="https://gerrit.cloudera.org/#/c/3477/">refactoring</a>. These patches |
| are now under review.</p> |
| </li> |
| <li> |
| <p>Congratulations to Andrew Wong, a new contributor who committed his |
| first patches this week. Andrew <a href="https://gerrit.cloudera.org/#/c/3424/">improved the build docs for OSX</a> |
| and also fixed a <a href="https://gerrit.cloudera.org/#/c/3486/">crash if the user forgot to specify the master address |
| in some command line tools</a>. |
| Thanks, Andrew!</p> |
| </li> |
| </ul> |
| |
| <h2 id="project-news">Project news</h2> |
| |
| <ul> |
| <li> |
| <p>The Apache Kudu web site has finished migrating to Apache Software Foundation infrastructure. |
| The site can now be found at <a href="http://kudu.incubator.apache.org/">kudu.incubator.apache.org</a>. |
| Existing links will automatically redirect.</p> |
| </li> |
| <li> |
| <p>A Kudu 0.9.1 release candidate was posted and passed a |
| <a href="http://mail-archives.apache.org/mod_mbox/incubator-kudu-dev/201606.mbox/%3CCADY20s6%3D%2BnKNgvx%3DG_pKupQGiH%2B9ToS53LqExBwWM6vLp-ns9A%40mail.gmail.com%3E">release vote</a> |
| by the Kudu Podling PMC (PPMC). |
| The release candidate will now be voted upon by the Apache Incubator PMC. If all goes well, we |
| can expect a release late this week. The release fixes a few critical bugs discovered in 0.9.0.</p> |
| </li> |
| <li> |
| <p>Chris Mattmann, one of Kudu’s mentors from the Apache Incubator, |
| started a <a href="http://mail-archives.apache.org/mod_mbox/incubator-kudu-dev/201606.mbox/%3CAD4A858D-403D-4E74-A4F4-DE2F08FB761E%40jpl.nasa.gov%3E">discussion</a> |
| about the project’s graduation to a top-level project (TLP). |
| Initial responses seem to be positive, so the next step will |
| be to work on a draft resolution and various stages of |
| voting.</p> |
| </li> |
| </ul> |
| |
| <h2 id="on-the-kudu-blog">On the Kudu blog</h2> |
| |
| <ul> |
| <li>Adar Dembo published a post detailing his recent work on |
| <a href="http://kudu.apache.org/2016/06/24/multi-master-1-0-0.html">master fault tolerance in Kudu 1.0</a>.</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="/2016/06/27/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> |
| |
| <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> |
| |
| </ul> |
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