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| <h1 class="entry-title">Apache Kudu (incubating) Weekly Update April 18, 2016</h1> |
| <p class="meta">Posted 18 Apr 2016 by Todd Lipcon</p> |
| </header> |
| <div class="entry-content"> |
| <p>Welcome to the fifth edition of the Kudu Weekly Update. This weekly blog post |
| covers ongoing development and news in the Apache Kudu (incubating) project.</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">@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="project-news">Project news</h2> |
| |
| <ul> |
| <li> |
| <p>Cloudera announced that it has posted <a href="http://markmail.org/thread/tghwcux5k4qvcsep">binary packages</a> |
| for the recent 0.8.0 release. These are not official packages from |
| the Apache Kudu (incubating) project, but users who prefer not to |
| build from source may find them convenient.</p> |
| </li> |
| <li> |
| <p>Jean-Daniel Cryans has volunteered to continue to act as release manager for |
| the 0.x release line, and has start a <a href="http://mail-archives.apache.org/mod_mbox/incubator-kudu-dev/201604.mbox/%3CCAGpTDNcfTOcp%2Beb39h5j%3DoxttZNhOBZ7v%2B%2B6hxRtWCh3t_psbQ%40mail.gmail.com%3E">discussion</a> |
| detailing what features and improvements he expects will be ready |
| for an 0.9 release in June.</p> |
| </li> |
| </ul> |
| |
| <h2 id="development-discussions-and-code-in-progress">Development discussions and code in progress</h2> |
| |
| <ul> |
| <li> |
| <p>Chris George posted a <a href="http://gerrit.cloudera.org:8080/#/c/2754/">work in progress patch</a> |
| for a native Kudu RDD implementation for Spark. Kudu already ships an RDD |
| based on the generic HadoopRDD and Kudu’s MapReduce integration, but Chris’s |
| new version paves the way for new features like pushing down predicates.</p> |
| </li> |
| <li> |
| <p>Todd Lipcon has been working on <a href="https://issues.apache.org/jira/browse/KUDU-1410">KUDU-1410</a>, |
| a small project which makes it easier to diagnose performance issues on a Kudu |
| cluster.</p> |
| |
| <p>The first feature proposed by this JIRA is the idea of collecting |
| “exemplar” traces: for each type of RPC (e.g. <em>Write</em>, <em>Scan</em>, etc.) |
| the RPC system will collect a few <em>exemplar</em> RPCs in different |
| latency buckets and retain their traces. This makes it easier for |
| an operator to see what might have caused a slow response from a |
| server even after the request has been finished for some time.</p> |
| |
| <p>The second new feature is the collection of per-RPC-request metrics |
| such as lock acquisition time, time spent waiting on disk, and other |
| metrics specific to each type of RPC. In combination with the |
| exemplar trace feature above, this should make it easy to root-cause |
| whether a request is slow due to underlying hardware issues, |
| Kudu-specific issues, or a particular workload characteristic.</p> |
| |
| <p>Todd posted a work-in-progress implementation of these features on gerrit |
| in a five-part patch series: |
| <a href="http://gerrit.cloudera.org:8080/#/c/2794/">(1)</a> |
| <a href="http://gerrit.cloudera.org:8080/#/c/2795/">(2)</a> |
| <a href="http://gerrit.cloudera.org:8080/#/c/2796/">(3)</a> |
| <a href="http://gerrit.cloudera.org:8080/#/c/2797/">(4)</a> |
| <a href="http://gerrit.cloudera.org:8080/#/c/2798/">(5)</a></p> |
| </li> |
| <li> |
| <p>Dan Burkert continued working on the <a href="http://gerrit.cloudera.org:8080/#/c/2592/">Java implementation of the Scan Token API</a> |
| described in previous weekly updates, with reviews this week from Jean-Daniel |
| Cryans and Adar Dembo. He also posted a patch for the <a href="http://gerrit.cloudera.org:8080/#/c/2757/">C++ implementation</a> |
| which has seen some review action as well.</p> |
| </li> |
| <li> |
| <p>Dan also posted a <a href="http://gerrit.cloudera.org:8080/#/c/2772/">design document for non-covering range partitioning</a>. |
| This new feature will allow Kudu operators to add or drop tablets to |
| an existing range-partitioned table. This is very important for time |
| series use cases where new partitions may need to be added daily, |
| and old partitions potentially dropped in order to achieve a |
| “sliding window” table. Read the design document for more details on |
| use cases and the expected semantics.</p> |
| </li> |
| </ul> |
| |
| <h2 id="on-the-kudu-blog">On the Kudu blog</h2> |
| |
| <ul> |
| <li>Pat Patterson wrote a post about <a href="http://getkudu.io/2016/04/14/ingesting-json-apache-kudu-streamsets-data-collector.html">Ingesting JSON Data into Apache Kudu with StreamSets |
| Data Collector</a>.</li> |
| </ul> |
| |
| |
| </div> |
| </article> |
| |
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| </div> |
| <div class="col-lg-3 recent-posts"> |
| <h3>Recent posts</h3> |
| <ul> |
| |
| <li> <a href="/2016/06/21/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> |
| |
| <li> <a href="/2016/04/18/weekly-update.html">Apache Kudu (incubating) Weekly Update April 18, 2016</a> </li> |
| |
| </ul> |
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