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| <h1>Apache Kudu 1.10.0 Release Notes</h1> |
| <div class="sect1"> |
| <h2 id="rn_1.10.0_upgrade_notes"><a class="link" href="#rn_1.10.0_upgrade_notes">Upgrade Notes</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>The default tablet history retention time has been raised from 15 minutes to |
| 7 days to better support touchless incremental backups |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-2677">KUDU-2677</a>).</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.10.0_obsoletions"><a class="link" href="#rn_1.10.0_obsoletions">Obsoletions</a></h2> |
| <div class="sectionbody"> |
| |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.10.0_deprecations"><a class="link" href="#rn_1.10.0_deprecations">Deprecations</a></h2> |
| <div class="sectionbody"> |
| |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.10.0_new_features"><a class="link" href="#rn_1.10.0_new_features">New features</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Kudu now supports both full and incremental table backups via a job |
| implemented using Apache Spark. Additionally it supports restoring |
| tables from full and incremental backups via a restore job implemented using |
| Apache Spark. See the <a href="administration.html#backup">backup documentation</a> |
| for more details.</p> |
| </li> |
| <li> |
| <p>Kudu can now synchronize its internal catalog with the Apache Hive Metastore, |
| automatically updating Hive Metastore table entries upon table creation, |
| deletion, and alterations in Kudu. See the |
| <a href="hive_metastore.html#metadata_sync">HMS synchronization documentation</a> |
| for more details.</p> |
| </li> |
| <li> |
| <p>Kudu now supports native fine-grained authorization via integration with |
| Apache Sentry. Kudu may now enforce access control policies defined for Kudu |
| tables and columns, as well as policies defined on Hive servers and databases |
| that may store Kudu tables. See the |
| <a href="security.html#fine_grained_authz">authorization documentation</a> for more |
| details.</p> |
| </li> |
| <li> |
| <p>Kudu’s web UI now supports SPNEGO, a protocol for securing HTTP requests with |
| Kerberos by passing negotiation through HTTP headers. To enable, set the |
| <code>--webserver_require_spnego</code> command line flag.</p> |
| </li> |
| <li> |
| <p>Column comments can now be stored in Kudu tables, and can be updated using |
| the AlterTable API |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-1711">KUDU-1711</a>).</p> |
| </li> |
| <li> |
| <p>The Java scan token builder can now create multiple tokens per tablet. |
| To use this functionality, call <code>setSplitSizeBytes()</code> to specify how many bytes |
| of data each token should scan. The same API is also available in Kudu’s |
| Spark integration, where it can be used to spawn multiple Spark tasks per |
| scanned tablet |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-2670">KUDU-2670</a>).</p> |
| </li> |
| <li> |
| <p>Experimental Kudu Docker images are now published on |
| <a href="https://hub.docker.com/r/apache/kudu">Docker Hub</a>.</p> |
| </li> |
| <li> |
| <p>Kudu now has an experimental Kubernetes StatefulSet manifest and Helm chart, |
| which can be used to define and provision Kudu clusters using Kubernetes |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-2398">KUDU-2398</a>).</p> |
| </li> |
| <li> |
| <p>The Kudu CLI now has rudimentary YAML-based configuration file support, |
| which can be used to provide cluster connection information via cluster name |
| instead of keying in comma-separated lists of master addresses. |
| See the <a href="https://kudu.apache.org/docs/administration.html#using_cluster_names_in_kudu_tool">cluster name documentation</a> |
| for more details.</p> |
| </li> |
| <li> |
| <p><code>kudu perf table_scan</code> scans a table and displays a table’s row count as well |
| as the time it took to run the scan.</p> |
| </li> |
| <li> |
| <p><code>kudu table copy</code> copies data from one table to another, within the same |
| cluster or across clusters. Note, this implementation leverages a single client, |
| therefore it may not be suitable for large tables.</p> |
| </li> |
| <li> |
| <p>Tablet history retention time can now be configured on a table-by-table basis. |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-2514">KUDU-2514</a>).</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.10.0_improvements"><a class="link" href="#rn_1.10.0_improvements">Optimizations and improvements</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>The performance of mutations (i.e. UPDATE, DELETE, and re-INSERT) to |
| not-yet-flushed Kudu data has been significantly optimized |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-2826">KUDU-2826</a> and |
| <a href="https://github.com/apache/kudu/commit/f9f9526d3">f9f9526d3</a>).</p> |
| </li> |
| <li> |
| <p>Predicate performance for primitive columns has been optimized |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-2846">KUDU-2846</a>).</p> |
| </li> |
| <li> |
| <p>IS NULL and IS NOT NULL predicate performance has been optimized |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-2846">KUDU-2846</a>).</p> |
| </li> |
| <li> |
| <p>Optimized the performance of fetching tablet locations from the master for |
| tables with large numbers of partitions. This can improve the performance of |
| short-running Spark or Impala queries as well as user applications which make |
| use of short-lived client instances |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-2711">KUDU-2711</a>).</p> |
| </li> |
| <li> |
| <p>The <code>tableExists()</code> (Java) and <code>TableExists()</code> (C++) APIs are now more performant |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-2802">KUDU-2802</a>).</p> |
| </li> |
| <li> |
| <p>Fault tolerant scans are now much more performant and consume far less memory |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-2466">KUDU-2466</a>).</p> |
| </li> |
| <li> |
| <p><code>kudu cluster ksck</code> now sends more requests in parallel, which should result |
| in a speed-up when running against clusters with many tables or when there’s |
| high latency between the node running the CLI and the cluster nodes.</p> |
| </li> |
| <li> |
| <p>Kudu’s block manager now deletes spent block containers when needed instead of |
| just at server startup. This should reduce server startup times somewhat |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-2636">KUDU-2636</a>).</p> |
| </li> |
| <li> |
| <p>DNS resolutions are now cached by Kudu masters, tablet servers, and |
| Kudu C++ clients. The TTL for a resolved DNS entry in the cache is 15 seconds |
| by default |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-2791">KUDU-2791</a>).</p> |
| </li> |
| <li> |
| <p>Tables created in Kudu 1.10.0 or later will show their creation time as well |
| as their last alteration time in the web UI |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-2750">KUDU-2750</a>).</p> |
| </li> |
| <li> |
| <p>The Kudu CLI and C++ client now support overriding the local username using |
| the ‘KUDU_USER_NAME’ environment variable. This allows operating against a |
| Kudu cluster using an identity which differs from the local Unix user on the |
| client. Note that this has no effect on secure clusters, where client identity |
| is determined by Kerberos authentication |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-2717">KUDU-2717</a>).</p> |
| </li> |
| <li> |
| <p>Kudu C++ client now performs stricter verification on the input data of |
| INSERT and UPSERT operations w.r.t. table schema constraints. This helps |
| spotting schema violations before sending the data to a tablet server.</p> |
| </li> |
| <li> |
| <p>The <code>KuduScanner</code> in the Java client is now iterable. Additionally the |
| <code>KuduScannerIterator</code> will automatically make scanner keep alive calls to |
| ensure scanners do not time out while iterating.</p> |
| </li> |
| <li> |
| <p>A <code>KuduPartitioner</code> API was added to the Java client. The <code>KuduPartitioner</code> |
| API allows a client to determine which partition a row falls into without |
| actually writing that row. For example, the <code>KuduPartitioner</code> is used in the |
| Spark integration to optionally repartition and pre-sort the data before |
| writing to Kudu |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-2674">KUDU-2674</a> and |
| <a href="https://issues.apache.org/jira/browse/KUDU-2672">KUDU-2672</a>).</p> |
| </li> |
| <li> |
| <p>The <code>PartialRow</code> and <code>RowResult</code> Java API have new methods that accept and return |
| Java Objects. These methods are useful when you don’t care about autoboxing |
| and your existing type handling logic is based on Java types. See the javadoc |
| for more details.</p> |
| </li> |
| <li> |
| <p>The Kudu Java client now logs RPC trace summaries instead of full RPC traces when |
| the log level is <code>INFO</code> or higher. This reduces log noise and makes RPC issues |
| more visible in a more compact format |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-2830">KUDU-2830</a>).</p> |
| </li> |
| <li> |
| <p>Kudu servers now display the time at which they were started in their web UIs.</p> |
| </li> |
| <li> |
| <p>Kudu tablet servers now display a table’s total column count in the web UI.</p> |
| </li> |
| <li> |
| <p>The <code>/metrics</code> web UI endpoint now supports filtering on entity types, |
| entity IDs, entity attributes, and metric names. This can be used to more |
| efficiently collect important metrics when there is a large number of tablets |
| on a tablet server.</p> |
| </li> |
| <li> |
| <p>The Kudu rebalancer now accepts the <code>--ignored_tservers</code> command line |
| argument, which can be used to ignore the health status of specific tablet |
| servers (i.e. if they are down) when deciding whether or not it’s safe to |
| rebalance the cluster.</p> |
| </li> |
| <li> |
| <p><code>kudu master list</code> now displays the Raft consensus role of each master in the |
| cluster (i.e. LEADER or FOLLOWER) |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-2825">KUDU-2825</a>).</p> |
| </li> |
| <li> |
| <p><code>kudu table scan</code> no longer interleaves its output, and now projects all |
| columns without having to manually list the column names.</p> |
| </li> |
| <li> |
| <p><code>kudu perf loadgen</code> now supports creating empty tables. The semantics of the |
| special value of 0 for <code>--num_rows_per_thread</code> flag has changed. A value of 0 |
| now indicates that no rows should be generated, and a value of -1 indicates |
| there should be no limit to the number of rows generated.</p> |
| </li> |
| <li> |
| <p>Running <code>make install</code> after building Kudu from source will now install the |
| Kudu binaries into appropriate locations. |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-1344">KUDU-1344</a>).</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.10.0_fixed_issues"><a class="link" href="#rn_1.10.0_fixed_issues">Fixed Issues</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Fixed an issue where the Java client would fail scans that took a very long |
| time to return a single block of rows, such as highly selective scans over a |
| large amount of data |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-1868">KUDU-1868</a>).</p> |
| </li> |
| <li> |
| <p>Fixed the handling of SERVICE_UNAVAILABLE errors that caused the Java client |
| to do unnecessary master lookups.</p> |
| </li> |
| <li> |
| <p>Kudu scan tokens now work correctly when the target table is renamed between |
| when the scan token is created and when it is rehydrated into a scanner.</p> |
| </li> |
| <li> |
| <p>Kudu’s “NTP synchronization wait” behavior at startup now works properly when |
| Kudu is run in a containerized environment.</p> |
| </li> |
| <li> |
| <p>Fixed a crash when a flush or compaction overlapped with another compaction |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-2807">KUDU-2807</a>).</p> |
| </li> |
| <li> |
| <p>Fixed a rare race at startup where the leader master would fruitlessly try to |
| tablet copy to a healthy follower master, causing the cluster to operate as if |
| it had two masters until master leadership changed |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-2748">KUDU-2748</a>).</p> |
| </li> |
| <li> |
| <p>Under rare circumstances, it was possible for Kudu to crash in libkrb5 when |
| negotiating multiple TLS connections concurrently. This crash has been fixed |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-2706">KUDU-2706</a>).</p> |
| </li> |
| <li> |
| <p>Kudu no longer crashes at startup on machines with disabled CPUs |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-2721">KUDU-2721</a>).</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.10.0_wire_compatibility"><a class="link" href="#rn_1.10.0_wire_compatibility">Wire Protocol compatibility</a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Kudu 1.10.0 is wire-compatible with previous versions of Kudu:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Kudu 1.10 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 1.9 and Kudu 1.10 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 1.10 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 1.10 and versions earlier than 1.3:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>If a Kudu 1.10 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 1.10 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_1.10.0_incompatible_changes"><a class="link" href="#rn_1.10.0_incompatible_changes">Incompatible Changes in Kudu 1.10.0</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Support for building and running with Java 7 has been dropped in this release. |
| It had been deprecated since Kudu 1.5.0. |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-2099">KUDU-2099</a>).</p> |
| </li> |
| </ul> |
| </div> |
| <div class="sect2"> |
| <h3 id="rn_1.10.0_client_compatibility"><a class="link" href="#rn_1.10.0_client_compatibility">Client Library Compatibility</a></h3> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>The Kudu 1.10 Java client library is API- and ABI-compatible with Kudu 1.9. Applications |
| written against Kudu 1.9 will compile and run against the Kudu 1.10 client library and |
| vice-versa.</p> |
| </li> |
| <li> |
| <p>The Kudu 1.10 C++ client is API- and ABI-forward-compatible with Kudu 1.9. |
| Applications written and compiled against the Kudu 1.9 client library will run without |
| modification against the Kudu 1.10 client library. Applications written and compiled |
| against the Kudu 1.10 client library will run without modification against the Kudu 1.9 |
| client library.</p> |
| </li> |
| <li> |
| <p>The Kudu 1.10 Python client is API-compatible with Kudu 1.9. Applications |
| written against Kudu 1.9 will continue to run against the Kudu 1.10 client |
| and vice-versa.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.10.0_known_issues"><a class="link" href="#rn_1.10.0_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_1.10.0_contributors"><a class="link" href="#rn_1.10.0_contributors">Contributors</a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Kudu 1.10 includes contributions from 27 people, including 6 first-time contributors:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Csaba Fulop</p> |
| </li> |
| <li> |
| <p>Florentino Sainz</p> |
| </li> |
| <li> |
| <p>Guangchao Deng</p> |
| </li> |
| <li> |
| <p>Jia Hongchao</p> |
| </li> |
| <li> |
| <p>Ye Yuqiang</p> |
| </li> |
| <li> |
| <p>Yifan Zhang</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="quickstart.html">Kudu Quickstart</a></p> |
| </li> |
| <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_1.10.0_upgrade_notes">Upgrade Notes</a></li> |
| <li><a href="#rn_1.10.0_obsoletions">Obsoletions</a></li> |
| <li><a href="#rn_1.10.0_deprecations">Deprecations</a></li> |
| <li><a href="#rn_1.10.0_new_features">New features</a></li> |
| <li><a href="#rn_1.10.0_improvements">Optimizations and improvements</a></li> |
| <li><a href="#rn_1.10.0_fixed_issues">Fixed Issues</a></li> |
| <li><a href="#rn_1.10.0_wire_compatibility">Wire Protocol compatibility</a></li> |
| <li><a href="#rn_1.10.0_incompatible_changes">Incompatible Changes in Kudu 1.10.0</a> |
| <ul class="sectlevel2"> |
| <li><a href="#rn_1.10.0_client_compatibility">Client Library Compatibility</a></li> |
| </ul> |
| </li> |
| <li><a href="#rn_1.10.0_known_issues">Known Issues and Limitations</a></li> |
| <li><a href="#rn_1.10.0_contributors">Contributors</a></li> |
| <li><a href="#resources_and_next_steps">Resources</a></li> |
| <li><a href="#_installation_options">Installation Options</a></li> |
| <li><a href="#_next_steps">Next Steps</a></li> |
| </ul> |
| </li> |
| <li> |
| |
| <a href="quickstart.html">Getting Started with Kudu</a> |
| </li> |
| <li> |
| |
| <a href="installation.html">Installation Guide</a> |
| </li> |
| <li> |
| |
| <a href="configuration.html">Configuring Kudu</a> |
| </li> |
| <li> |
| |
| <a href="kudu_impala_integration.html">Using Impala with Kudu</a> |
| </li> |
| <li> |
| |
| <a href="administration.html">Administering Kudu</a> |
| </li> |
| <li> |
| |
| <a href="troubleshooting.html">Troubleshooting Kudu</a> |
| </li> |
| <li> |
| |
| <a href="developing.html">Developing Applications with Kudu</a> |
| </li> |
| <li> |
| |
| <a href="schema_design.html">Kudu Schema Design</a> |
| </li> |
| <li> |
| |
| <a href="scaling_guide.html">Kudu Scaling Guide</a> |
| </li> |
| <li> |
| |
| <a href="security.html">Kudu Security</a> |
| </li> |
| <li> |
| |
| <a href="transaction_semantics.html">Kudu Transaction Semantics</a> |
| </li> |
| <li> |
| |
| <a href="background_tasks.html">Background Maintenance Tasks</a> |
| </li> |
| <li> |
| |
| <a href="configuration_reference.html">Kudu Configuration Reference</a> |
| </li> |
| <li> |
| |
| <a href="command_line_tools_reference.html">Kudu Command Line Tools Reference</a> |
| </li> |
| <li> |
| |
| <a href="known_issues.html">Known Issues and Limitations</a> |
| </li> |
| <li> |
| |
| <a href="contributing.html">Contributing to Kudu</a> |
| </li> |
| <li> |
| |
| <a href="export_control.html">Export Control Notice</a> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| </div> |
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| <div class="col-md-9"> |
| <p class="small"> |
| Copyright © 2019 The Apache Software Foundation. Last updated 2019-07-09 12:51:23 PDT |
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| <p class="small"> |
| Apache Kudu, Kudu, Apache, the Apache feather logo, and the Apache Kudu |
| project logo are either registered trademarks or trademarks of The |
| Apache Software Foundation in the United States and other countries. |
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