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| |
| <h1>Apache Kudu 1.9.0 Release Notes</h1> |
| <div class="sect1"> |
| <h2 id="rn_1.9.0_upgrade_notes"><a class="link" href="#rn_1.9.0_upgrade_notes">Upgrade Notes</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Flume 1.8+ requires Java 8 at runtime even though the Kudu Flume integration |
| is Java 7 compatible. Flume 1.9 is the default dependency version as of |
| Kudu 1.9.0.</p> |
| </li> |
| <li> |
| <p>Hadoop 3.0+ requires Java 8 at runtime even though the Kudu Hadoop integration |
| is Java 7 compatible. Hadoop 3.2 is the default dependency version as of |
| Kudu 1.9.0.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.9.0_obsoletions"><a class="link" href="#rn_1.9.0_obsoletions">Obsoletions</a></h2> |
| <div class="sectionbody"> |
| |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.9.0_deprecations"><a class="link" href="#rn_1.9.0_deprecations">Deprecations</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Support for Java 7 has been deprecated since Kudu 1.5.0 and may be removed in |
| the next major release.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.9.0_new_features"><a class="link" href="#rn_1.9.0_new_features">New features</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Kudu now supports location awareness. When configured, Kudu will make a best |
| effort to avoid placing a majority of replicas for a given tablet at the same |
| location. The <code>kudu cluster rebalance</code> tool has been updated to act in |
| accordance with the placement policy of a location-aware Kudu. The |
| <a href="https://kudu.apache.org/releases/1.9.0/docs/administration.html#rack_awareness">administrative |
| documentation</a> has been updated to detail the usage of this feature.</p> |
| </li> |
| <li> |
| <p>Docker scripts have been introduced to build and run Kudu on various operating |
| systems. See the <code>/docker</code> subdirectory of the source repository for more |
| details. An <a href="https://hub.docker.com/r/apache/kudu">official repository</a> has |
| been created for Apache Kudu Docker artifacts.</p> |
| </li> |
| <li> |
| <p>Developers integrating with Kudu can now write Java tests that start a Kudu |
| mini cluster without having to first locally build and install Kudu. This is |
| made possible by the Kudu team providing platform-specific binaries available |
| to Gradle or Maven for download and install at test time. More information on |
| this feature can be found <a href="developing.html">here</a>. This binary test |
| artifact is currently considered to be experimental.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.9.0_improvements"><a class="link" href="#rn_1.9.0_improvements">Optimizations and improvements</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>When creating a table, the master now enforces a restriction on the total |
| number of replicas rather than the total number of partitions. If manually |
| overriding <code>--max_create_tablets_per_ts</code>, the maximum size of a new table |
| has effectively been cut by a factor of its replication factor. Note that |
| partitions can still be added after table creation.</p> |
| </li> |
| <li> |
| <p>The compaction policy has been updated to favor reducing the number of |
| rowsets. This can lead to faster scans and lower bootup times, particularly |
| in the face of a “trickling inserts” workload, where rows are inserted slowly |
| in primary key order (see |
| <a href="https://issues.apache.org/jira/browse/KUDU-1400">KUDU-1400</a>).</p> |
| </li> |
| <li> |
| <p>A tablet-level metric <code>average_diskrowset_height</code> has been added to indicate |
| how much a replica needs to be compacted, as indicated by the average number |
| of rowsets per unit of keyspace.</p> |
| </li> |
| <li> |
| <p>Scans which read multiple columns of tables undergoing a heavy <code>UPDATE</code> |
| workload are now more CPU efficient. In some cases, scan performance of such |
| tables may be several times faster upon upgrading to this release.</p> |
| </li> |
| <li> |
| <p>Kudu-Spark users can now provide the short “kudu” format alias to Spark. This |
| enables using <code>.format(“kudu”)</code> in places where you would have needed to |
| provide the fully qualified name like <code>.format(“org.apache.kudu.spark.kudu")</code> |
| or imported <code>org.apache.kudu.spark.kudu._</code> and used the implicit <code>.kudu</code> |
| functions. The |
| <a href="https://kudu.apache.org/releases/1.9.0/docs/developing.html#_kudu_integration_with_spark">Spark |
| integration documentation</a> has been updated to reflect this improvement.</p> |
| </li> |
| <li> |
| <p>The <code>KuduSink</code> class has been added to the Spark integration as a |
| <code>StreamSinkProvider</code>, allowing structured streaming writes into Kudu (see |
| <a href="https://issues.apache.org/jira/browse/KUDU-2640">KUDU-2640</a>).</p> |
| </li> |
| <li> |
| <p>The amount of server-side logging has been greatly reduced for Kudu’s |
| consensus implementation and background processes. This logging was determined |
| to be not useful and unnecessarily verbose.</p> |
| </li> |
| <li> |
| <p>The web UI now more obviously depicts which columns are a part of the primary |
| key (see <a href="https://issues.apache.org/jira/browse/KUDU-2477">KUDU-2477</a>).</p> |
| </li> |
| <li> |
| <p>The <code>kudu table describe</code> tool has been added to support describing table |
| attributes, including schema, partitioning, replication factor, column |
| encodings, compressions, and default values.</p> |
| </li> |
| <li> |
| <p>The <code>kudu table scan</code> tool has been added to scan rows from a table, |
| supporting comparison, in-list, and is-null predicates.</p> |
| </li> |
| <li> |
| <p>The <code>kudu locate_row</code> tool has been added to allow users to determine what |
| tablet a given primary key belongs to, and whether a row exists for that |
| primary key.</p> |
| </li> |
| <li> |
| <p>The <code>kudu diagnose dump_mem_trackers</code> tool is added to allow users to output |
| the contents of the <code>/mem-trackers</code> web UI page in a CSV format.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.9.0_fixed_issues"><a class="link" href="#rn_1.9.0_fixed_issues">Fixed Issues</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>To avoid glitches and undefined behavior, the Kudu Python client now |
| detects and reports on conflicting/incorrect initialization of the OpenSSL |
| library.</p> |
| </li> |
| <li> |
| <p>Fixed a crash caused by a race between altering tablet schemas and deleting |
| tablet replicas (see |
| <a href="https://issues.apache.org/jira/browse/KUDU-1678">KUDU-1678</a>).</p> |
| </li> |
| <li> |
| <p>Fixed an issue that would prevent the <code>kudu fs update_dirs</code> tool from |
| removing directories in the presence of tablet tombstones (see |
| <a href="https://issues.apache.org/jira/browse/KUDU-2680">KUDU-2680</a>).</p> |
| </li> |
| <li> |
| <p>The <code>--cmeta_force_fsync</code> flag may be used to fsync Kudu’s consensus |
| metadata more aggressively. Setting this to <code>true</code> may decrease Kudu’s |
| performance, but improve its durability in the face of power failures and |
| forced shutdowns (see |
| <a href="https://issues.apache.org/jira/browse/KUDU-2195">KUDU-2195</a>).</p> |
| </li> |
| <li> |
| <p>Fixed an issue that would cause an excessive amount of RPC traffic from Kudu |
| masters if the tablet servers were configured with duplicated master addresses |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-2684">KUDU-2684</a>).</p> |
| </li> |
| <li> |
| <p>Fixed an issue that would cause the <code>kudu cluster rebalance</code> tool to run |
| indefinitely in the case of tables with a replication factor of 2 (see |
| <a href="https://issues.apache.org/jira/browse/KUDU-2688">KUDU-2688</a>).</p> |
| </li> |
| <li> |
| <p>Fixed an issue that could lead to a failure to bootstrap tablet replicas |
| that were a part of workloads with many alter table operations |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-2690">KUDU-2690</a>).</p> |
| </li> |
| <li> |
| <p>Fixed an issue with the Java scanner’s <code>keepAlive</code> that could lead to a |
| permanent hang in the scanner (see |
| <a href="https://issues.apache.org/jira/browse/KUDU-2710">KUDU-2710</a>).</p> |
| </li> |
| <li> |
| <p>Fixed an issue that would cause undefined behavior upon connecting to a |
| secure cluster concurrently from multiple C++ clients (see |
| <a href="https://issues.apache.org/jira/browse/KUDU-2706">KUDU-2706</a>).</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.9.0_wire_compatibility"><a class="link" href="#rn_1.9.0_wire_compatibility">Wire Protocol compatibility</a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Kudu 1.9.0 is wire-compatible with previous versions of Kudu:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Kudu 1.9 clients may connect to servers running Kudu 1.0 or later. If the client uses |
| features that are not available on the target server, an error will be returned.</p> |
| </li> |
| <li> |
| <p>Rolling upgrade between Kudu 1.8 and Kudu 1.9 servers is believed to be possible |
| though has not been sufficiently tested. Users are encouraged to shut down all nodes |
| in the cluster, upgrade the software, and then restart the daemons on the new version.</p> |
| </li> |
| <li> |
| <p>Kudu 1.0 clients may connect to servers running Kudu 1.9 with the exception of the |
| below-mentioned restrictions regarding secure clusters.</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>The authentication features introduced in Kudu 1.3 place the following limitations |
| on wire compatibility between Kudu 1.9 and versions earlier than 1.3:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>If a Kudu 1.9 cluster is configured with authentication or encryption set to "required", |
| clients older than Kudu 1.3 will be unable to connect.</p> |
| </li> |
| <li> |
| <p>If a Kudu 1.9 cluster is configured with authentication and encryption set to "optional" |
| or "disabled", older clients will still be able to connect.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.9.0_incompatible_changes"><a class="link" href="#rn_1.9.0_incompatible_changes">Incompatible Changes in Kudu 1.9.0</a></h2> |
| <div class="sectionbody"> |
| <div class="sect2"> |
| <h3 id="rn_1.9.0_client_compatibility"><a class="link" href="#rn_1.9.0_client_compatibility">Client Library Compatibility</a></h3> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>The Kudu 1.9 Java client library is API- and ABI-compatible with Kudu 1.8. Applications |
| written against Kudu 1.8 will compile and run against the Kudu 1.9 client library and |
| vice-versa.</p> |
| </li> |
| <li> |
| <p>The Kudu 1.9 C++ client is API- and ABI-forward-compatible with Kudu 1.8. |
| Applications written and compiled against the Kudu 1.8 client library will run without |
| modification against the Kudu 1.9 client library. Applications written and compiled |
| against the Kudu 1.9 client library will run without modification against the Kudu 1.8 |
| client library.</p> |
| </li> |
| <li> |
| <p>The Kudu 1.9 Python client is API-compatible with Kudu 1.8. Applications |
| written against Kudu 1.8 will continue to run against the Kudu 1.9 client |
| and vice-versa.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.9.0_known_issues"><a class="link" href="#rn_1.9.0_known_issues">Known Issues and Limitations</a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Please refer to the <a href="known_issues.html">Known Issues and Limitations</a> section of the |
| documentation.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.9.0_contributors"><a class="link" href="#rn_1.9.0_contributors">Contributors</a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Kudu 1.9 includes contributions from 24 people, including 5 first-time contributors:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Bankim Bhavsar</p> |
| </li> |
| <li> |
| <p>Mike Parker</p> |
| </li> |
| <li> |
| <p>Mitch Barnett</p> |
| </li> |
| <li> |
| <p>Tim Armstrong</p> |
| </li> |
| <li> |
| <p>Yingchun Lai</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>Thank you for your help in making Kudu even better!</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="resources_and_next_steps"><a class="link" href="#resources_and_next_steps">Resources</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><a href="http://kudu.apache.org">Kudu Website</a></p> |
| </li> |
| <li> |
| <p><a href="http://github.com/apache/kudu">Kudu GitHub Repository</a></p> |
| </li> |
| <li> |
| <p><a href="index.html">Kudu Documentation</a></p> |
| </li> |
| <li> |
| <p><a href="prior_release_notes.html">Release notes for older releases</a></p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_installation_options"><a class="link" href="#_installation_options">Installation Options</a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>For full installation details, see <a href="installation.html">Kudu Installation</a>.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_next_steps"><a class="link" href="#_next_steps">Next Steps</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><a href="installation.html">Installing Kudu</a></p> |
| </li> |
| <li> |
| <p><a href="configuration.html">Configuring Kudu</a></p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="col-md-3"> |
| |
| <div id="toc" data-spy="affix" data-offset-top="70"> |
| <ul> |
| |
| <li> |
| |
| <a href="index.html">Introducing Kudu</a> |
| </li> |
| <li> |
| <span class="active-toc">Kudu Release Notes</span> |
| <ul class="sectlevel1"> |
| <li><a href="#rn_1.9.0_upgrade_notes">Upgrade Notes</a></li> |
| <li><a href="#rn_1.9.0_obsoletions">Obsoletions</a></li> |
| <li><a href="#rn_1.9.0_deprecations">Deprecations</a></li> |
| <li><a href="#rn_1.9.0_new_features">New features</a></li> |
| <li><a href="#rn_1.9.0_improvements">Optimizations and improvements</a></li> |
| <li><a href="#rn_1.9.0_fixed_issues">Fixed Issues</a></li> |
| <li><a href="#rn_1.9.0_wire_compatibility">Wire Protocol compatibility</a></li> |
| <li><a href="#rn_1.9.0_incompatible_changes">Incompatible Changes in Kudu 1.9.0</a> |
| <ul class="sectlevel2"> |
| <li><a href="#rn_1.9.0_client_compatibility">Client Library Compatibility</a></li> |
| </ul> |
| </li> |
| <li><a href="#rn_1.9.0_known_issues">Known Issues and Limitations</a></li> |
| <li><a href="#rn_1.9.0_contributors">Contributors</a></li> |
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