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| <h1>Apache Kudu 1.12.0 Release Notes</h1> |
| <div class="sect1"> |
| <h2 id="rn_1.12.0_upgrade_notes"><a class="link" href="#rn_1.12.0_upgrade_notes">Upgrade Notes</a></h2> |
| <div class="sectionbody"> |
| |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.12.0_obsoletions"><a class="link" href="#rn_1.12.0_obsoletions">Obsoletions</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>The Flume sink has been migrated to the Apache Flume project and removed |
| from Kudu. Users depending on the Flume integration can use the old |
| <code>kudu-flume</code> jars or migrate to the Flume jars containing the Kudu sink.</p> |
| </li> |
| <li> |
| <p>Support for Apache Sentry authorization has been deprecated and may be |
| removed in the next minor release. Users depending on the Sentry integration |
| should migrate to the Apache Ranger integration for fine-grained authorization.</p> |
| </li> |
| <li> |
| <p>Support for Python 2 has been deprecated and may be removed in the next minor |
| release.</p> |
| </li> |
| <li> |
| <p>Support for CentOS/RHEL 6, Debian 8, Ubuntu 14 has been deprecated and may |
| be removed in the next minor release.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.12.0_deprecations"><a class="link" href="#rn_1.12.0_deprecations">Deprecations</a></h2> |
| <div class="sectionbody"> |
| |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.12.0_new_features"><a class="link" href="#rn_1.12.0_new_features">New features</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Kudu now supports native fine-grained authorization via integration with |
| Apache Ranger. Kudu may now enforce access control policies defined for |
| Kudu tables and columns stored in Ranger. 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 proxying via Apache Knox. Kudu may be deployed |
| in a firewalled state behind a Knox Gateway which will forward HTTP requests |
| and responses between clients and the Kudu web UI.</p> |
| </li> |
| <li> |
| <p>Kudu’s web UI now supports HTTP keep-alive. Operations that access multiple |
| URLs will now reuse a single HTTP connection, improving their performance.</p> |
| </li> |
| <li> |
| <p>The <code>kudu tserver quiesce</code> tool is added to quiesce tablet servers. While a |
| tablet server is quiescing, it will stop hosting tablet leaders and stop |
| serving new scan requests. This can be used to orchestrate a rolling restart |
| without stopping on-going Kudu workloads.</p> |
| </li> |
| <li> |
| <p>Introduced <code>auto</code> time source for HybridClock timestamps. With |
| <code>--time_source=auto</code> in AWS and GCE cloud environments, Kudu masters and |
| tablet servers use the built-in NTP client synchronized with dedicated NTP |
| servers available via host-only networks. With <code>--time_source=auto</code> in |
| environments other than AWS/GCE, Kudu masters and tablet servers rely on |
| their local machine’s clock synchronized by NTP. The default setting for |
| the HybridClock time source (<code>--time_source=system</code>) is backward-compatible, |
| requiring the local machine’s clock to be synchronized by the kernel’s NTP |
| discipline.</p> |
| </li> |
| <li> |
| <p>The <code>kudu cluster rebalance</code> tool now supports moving replicas away from |
| specific tablet servers by supplying the <code>--ignored_tservers</code> and |
| <code>--move_replicas_from_ignored_tservers</code> arguments (see |
| <a href="https://issues.apache.org/jira/browse/KUDU-2914">KUDU-2914</a> for more |
| details).</p> |
| </li> |
| <li> |
| <p>The <code>kudu table create</code> tool is added to allow users to specify table |
| creation options using JSON.</p> |
| </li> |
| <li> |
| <p>Kudu now supports DATE and VARCHAR data types. See the |
| <a href="http://kudu.apache.org/docs/schema_design.html">schema design documentation</a> |
| for more details.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.12.0_improvements"><a class="link" href="#rn_1.12.0_improvements">Optimizations and improvements</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Write Ahead Log file segments and index chunks are now managed by Kudu’s file |
| cache. With that, all long-lived file descriptors used by Kudu are managed by |
| the file cache, and there’s no longer a need for capacity planning of file |
| descriptor usage.</p> |
| </li> |
| <li> |
| <p>Kudu no longer requires the running of <code>kudu fs update_dirs</code> to change a |
| directory configuration or recover from a disk failure |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-2993">KUDU-2993</a>).</p> |
| </li> |
| <li> |
| <p>Kudu tablet servers and masters now expose a tablet-level metric |
| <code>num_raft_leaders</code> for the number of Raft leaders hosted on the server.</p> |
| </li> |
| <li> |
| <p>Kudu’s maintenance operation scheduling has been updated to prioritize |
| reducing WAL retention under memory pressure. Kudu would previously prioritize |
| operations that yielded high-memory reduction, which could result in high WAL |
| disk usage in workloads that contained updates |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-3002">KUDU-3002</a>).</p> |
| </li> |
| <li> |
| <p>A new maintenance operation is introduced to remove rowsets that have had all |
| of their rows deleted and whose newest delete operations are considered |
| ancient (see <a href="https://issues.apache.org/jira/browse/KUDU-1625">KUDU-1625</a>).</p> |
| </li> |
| <li> |
| <p>The built-in NTP client is now fully supported as the time source for Kudu’s |
| HybridTime clock, i.e. it’s no longer marked as experimental. To switch the |
| time source from the existing <code>system</code> time source (which is the default) |
| to the built-in NTP client, use <code>--time_source=builtin</code>.</p> |
| </li> |
| <li> |
| <p>Introduced additional metrics for the built-in NTP client |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-3048">KUDU-3048</a>).</p> |
| </li> |
| <li> |
| <p>Updated <code>/config</code> page of masters' and tablet servers' web UI to display |
| configured and effective time source. In addition, the effective list of |
| reference servers for the built-in NTP client is shown there as well, |
| if applicable.</p> |
| </li> |
| <li> |
| <p><code>chronyd</code> (version 3.4 and newer) is now supported as NTP server for |
| synchronizing the local machine’s clock in a Kudu cluster. It’s important to |
| have the <code>rtcsync</code> option enabled in the configuration of the <code>chronyd</code> NTP |
| daemon (see <a href="https://issues.apache.org/jira/browse/KUDU-2573">KUDU-2573</a>).</p> |
| </li> |
| <li> |
| <p>Kudu now supports building and running on RHEL/CentOS 8. This has been tested |
| with CentOS 8.1.</p> |
| </li> |
| <li> |
| <p>The processing of Raft consensus vote requests has been improved to be more |
| robust during high contention scenarios like election storms.</p> |
| </li> |
| <li> |
| <p>Added a validator to enforce consistency between the maximum size of an RPC |
| and the maximum size of tablet transaction memory, controlled by |
| <code>--rpc_max_message_size</code> and <code>--tablet_transaction_memory</code> flags |
| correspondingly. In prior releases, if the limit on the size of RPC requests |
| is increased and the limit on tablet transaction memory size is kept with the |
| default setting, certain Raft transactions could be committed but not applied |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-3023">KUDU-3023</a>).</p> |
| </li> |
| <li> |
| <p>The metrics endpoint now supports filtering metrics by a metric severity level. |
| See the <a href="https://kudu.apache.org/docs/administration.html#_collecting_metrics_via_http">documentation</a> |
| for more details.</p> |
| </li> |
| <li> |
| <p>Many <code>kudu local_replica</code> tools are updated to not open the block manager, |
| which significantly reduces the amount of IO done when running them (see |
| <a href="https://issues.apache.org/jira/browse/KUDU-3070">KUDU-3070</a> for more |
| details).</p> |
| </li> |
| <li> |
| <p>The Kudu Java client now exposes a way to get the resource metrics associated |
| with a given scanner (see |
| <a href="https://issues.apache.org/jira/browse/KUDU-2162">KUDU-2162</a> for more |
| details).</p> |
| </li> |
| <li> |
| <p>Scan predicates are pushed down to RLE decoders, improving |
| predicate-evaluation-efficiency in some workloads (see |
| <a href="https://issues.apache.org/jira/browse/KUDU-2852">KUDU-2852</a> for more |
| details).</p> |
| </li> |
| <li> |
| <p>The log block manager will now attempt to use multiple threads to open blocks |
| in each data directory, in some tests reducing startup time by up to 20% (see |
| <a href="https://issues.apache.org/jira/browse/KUDU-2977">KUDU-2977</a> and |
| <a href="https://issues.apache.org/jira/browse/KUDU-3001">KUDU-3001</a> for more |
| details).</p> |
| </li> |
| <li> |
| <p>Kudu’s tablet server web UI scans page is updated to show the number of round |
| trips per scanner.</p> |
| </li> |
| <li> |
| <p>Kudu’s master and tablet server web UIs are updated to show critical |
| partition information, including tablet count and on-disk size.</p> |
| </li> |
| <li> |
| <p>Kudu servers now expose the <code>last_read_elapsed_seconds</code> and |
| <code>last_write_elapsed_seconds</code> tablet-level metrics that indicate how long ago |
| the most recent read and write operations to a given tablet were.</p> |
| </li> |
| <li> |
| <p>Kudu servers now expose the <code>transaction_memory_limit_rejections</code> |
| tablet-level metric that tracks the number of transactions rejected because a |
| given tablet’s transactional memory limit was reached (see |
| <a href="https://issues.apache.org/jira/browse/KUDU-3021">KUDU-3021</a> for more |
| details).</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.12.0_fixed_issues"><a class="link" href="#rn_1.12.0_fixed_issues">Fixed Issues</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Fixed a bug in which Kudu would not schedule compactions if a server were |
| under memory pressure |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-2929">KUDU-2929</a>).</p> |
| </li> |
| <li> |
| <p>Fixed a bug where DDL operations like ALTER TABLE on tables with huge |
| number of partitions might result in a DoS situation for Kudu masters |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-3036">KUDU-3036</a>).</p> |
| </li> |
| <li> |
| <p>Fixed a bug where Kudu Java client cannot negotiate a secure connection |
| with Kudu masters and tablet servers if using BouncyCastle JCE provider |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-3106">KUDU-3106</a>).</p> |
| </li> |
| <li> |
| <p>Kudu masters will now crash immediately upon hitting a disk failure (see |
| <a href="https://issues.apache.org/jira/browse/KUDU-2904">KUDU-2904</a> for more details).</p> |
| </li> |
| <li> |
| <p>Fixed an issue in the Kudu master in which delays in receiving tablet server |
| heartbeats could result in an excess amount of RPC traffic between the |
| masters and tablet servers (see |
| <a href="https://issues.apache.org/jira/browse/KUDU-2992">KUDU-2992</a> for more |
| details).</p> |
| </li> |
| <li> |
| <p>Fixed an issue with Kudu’s location placement policy that would place all |
| replicas in one location when two locations were available (see |
| <a href="https://issues.apache.org/jira/browse/KUDU-3008">KUDU-3008</a> for more |
| details).</p> |
| </li> |
| <li> |
| <p>The Java client will now correctly propagate timestamps when sending write |
| batches (see <a href="https://issues.apache.org/jira/browse/KUDU-3035">KUDU-3035</a> |
| for more detail).</p> |
| </li> |
| <li> |
| <p>Fixed an issue with the Kudu backup Spark jobs in which Kudu would return |
| with a non-zero exit if the job succeeded but backed up no rows (see |
| <a href="https://issues.apache.org/jira/browse/KUDU-3099">KUDU-3099</a> for more |
| details).</p> |
| </li> |
| <li> |
| <p>The <code>raft_term</code> and <code>time_since_last_leader_heartbeat</code> aggregated table |
| metrics will now return the maximum metric reported instead of the sum.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.12.0_wire_compatibility"><a class="link" href="#rn_1.12.0_wire_compatibility">Wire Protocol compatibility</a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Kudu 1.12.0 is wire-compatible with previous versions of Kudu:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Kudu 1.12 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 1.11 and Kudu 1.12 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 1.12 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 1.12 and versions earlier than 1.3:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>If a Kudu 1.12 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 1.12 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_1.12.0_incompatible_changes"><a class="link" href="#rn_1.12.0_incompatible_changes">Incompatible Changes in Kudu 1.12.0</a></h2> |
| <div class="sectionbody"> |
| <div class="sect2"> |
| <h3 id="rn_1.12.0_client_compatibility"><a class="link" href="#rn_1.12.0_client_compatibility">Client Library Compatibility</a></h3> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>The Kudu 1.12 Java client library is API- and ABI-compatible with Kudu 1.11. Applications |
| written against Kudu 1.11 will compile and run against the Kudu 1.12 client library and |
| vice-versa.</p> |
| </li> |
| <li> |
| <p>The Kudu 1.12 C++ client is API- and ABI-forward-compatible with Kudu 1.11. |
| Applications written and compiled against the Kudu 1.11 client library will run without |
| modification against the Kudu 1.12 client library. Applications written and compiled |
| against the Kudu 1.12 client library will run without modification against the Kudu 1.11 |
| client library.</p> |
| </li> |
| <li> |
| <p>The Kudu 1.12 Python client is API-compatible with Kudu 1.11. Applications |
| written against Kudu 1.11 will continue to run against the Kudu 1.12 client |
| and vice-versa.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.12.0_known_issues"><a class="link" href="#rn_1.12.0_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_1.12.0_contributors"><a class="link" href="#rn_1.12.0_contributors">Contributors</a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Kudu 1.12 includes contributions from 33 people, including 8 first-time |
| contributors:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Andy Singer</p> |
| </li> |
| <li> |
| <p>Michele Milesi</p> |
| </li> |
| <li> |
| <p>Ning Wang</p> |
| </li> |
| <li> |
| <p>Renhai Zhao</p> |
| </li> |
| <li> |
| <p>Sheng Liu</p> |
| </li> |
| <li> |
| <p>Thomas D’Silva</p> |
| </li> |
| <li> |
| <p>Tianhua Huang</p> |
| </li> |
| <li> |
| <p>Waleed Fateem</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_1.12.0_upgrade_notes">Upgrade Notes</a></li> |
| <li><a href="#rn_1.12.0_obsoletions">Obsoletions</a></li> |
| <li><a href="#rn_1.12.0_deprecations">Deprecations</a></li> |
| <li><a href="#rn_1.12.0_new_features">New features</a></li> |
| <li><a href="#rn_1.12.0_improvements">Optimizations and improvements</a></li> |
| <li><a href="#rn_1.12.0_fixed_issues">Fixed Issues</a></li> |
| <li><a href="#rn_1.12.0_wire_compatibility">Wire Protocol compatibility</a></li> |
| <li><a href="#rn_1.12.0_incompatible_changes">Incompatible Changes in Kudu 1.12.0</a> |
| <ul class="sectlevel2"> |
| <li><a href="#rn_1.12.0_client_compatibility">Client Library Compatibility</a></li> |
| </ul> |
| </li> |
| <li><a href="#rn_1.12.0_known_issues">Known Issues and Limitations</a></li> |
| <li><a href="#rn_1.12.0_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">Quickstart Guide</a> |
| </li> |
| <li> |
| |
| <a href="installation.html">Installation Guide</a> |
| </li> |
| <li> |
| |
| <a href="configuration.html">Configuring Kudu</a> |
| </li> |
| <li> |
| |
| <a href="hive_metastore.html">Using the Hive Metastore with 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> |
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| <p class="small"> |
| Copyright © 2019 The Apache Software Foundation. Last updated 2020-05-18 13:53:35 PDT |
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| Apache Kudu, Kudu, Apache, the Apache feather logo, and the Apache Kudu |
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