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| |
| <h1>Apache Kudu 1.15.0 Release Notes</h1> |
| <div class="sect1"> |
| <h2 id="rn_1.15.0_upgrade_notes"><a class="link" href="#rn_1.15.0_upgrade_notes">Upgrade Notes</a></h2> |
| <div class="sectionbody"> |
| |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.15.0_obsoletions"><a class="link" href="#rn_1.15.0_obsoletions">Obsoletions</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>The <code>kudu-mapreduce</code> integration has been removed in the 1.15.0 release. |
| Similar functionality and capabilities now exist via the Apache Spark, Apache Hive, Apache Impala, |
| and Apache NiFi integrations. See <a href="https://issues.apache.org/jira/browse/KUDU-3142">KUDU-3142</a> |
| for details.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.15.0_deprecations"><a class="link" href="#rn_1.15.0_deprecations">Deprecations</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Support for Python 2.x and Python 3.4 and earlier is deprecated and may be removed in the next minor |
| release.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.15.0_new_features"><a class="link" href="#rn_1.15.0_new_features">New features</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Kudu now experimentally supports multi-row transactions. Currently only <code>INSERT</code> and |
| <code>INSERT_IGNORE</code> operations are supported. |
| See <a href="https://github.com/apache/kudu/blob/master/docs/design-docs/transactions.adoc">here</a> for a |
| design overview of this feature.</p> |
| </li> |
| <li> |
| <p>Kudu now supports Raft configuration change for Kudu masters and CLI tools for orchestrating |
| addition and removal of masters in a Kudu cluster. These tools substantially simplify the process |
| of migrating to multiple masters, recovering a dead master and removing masters from a Kudu cluster. |
| For detailed steps, see the latest administration documentation. This feature is evolving and |
| the steps to add, remove and recover masters may change in the future. |
| See <a href="https://issues.apache.org/jira/browse/KUDU-2181">KUDU-2181</a> for details.</p> |
| </li> |
| <li> |
| <p>Kudu now supports table comments directly on Kudu tables which are automatically synchronized |
| when the Hive Metastore integration is enabled. These comments can be added at table creation time |
| and changed via table alteration.</p> |
| </li> |
| <li> |
| <p>Kudu now experimentally supports per-table size limits based on leader disk space usage or number |
| of rows. When generating new authorization tokens, Masters will now consider the size limits and |
| strip tokens of <code>INSERT</code> and <code>UPDATE</code> privileges if either limit is reached. To enable this feature, |
| set the <code>--enable_table_write_limit</code> master flag; adjust the <code>--table_disk_size_limit</code> and |
| <code>--table_row_count_limit</code> flags as desired or use the <code>kudu table set_limit</code> tool to set limits per |
| table.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.15.0_improvements"><a class="link" href="#rn_1.15.0_improvements">Optimizations and improvements</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>It is now possible to change the Kerberos Service Principal Name using the <code>--principal</code> flag. The |
| default SPN is still <code>kudu/_HOST</code>. Clients connecting to a cluster using a non-default SPN must set |
| the <code>sasl_protocol_name</code> or <code>saslProtocolName</code> to match the SPN base |
| (i.e. “kudu” if the SPN is “kudu/_HOST”) in the client builder or the Kudu CLI. |
| See <a href="https://issues.apache.org/jira/browse/KUDU-1884">KUDU-1884</a> for details.</p> |
| </li> |
| <li> |
| <p>Kudu RPC now supports TLSv1.3. Kudu servers and clients automatically negotiate TLSv1.3 for Kudu |
| RPC if OpenSSL (or Java runtime correspondingly) on each side supports TLSv1.3. |
| If necessary, use the newly introduced flag <code>--rpc_tls_ciphersuites</code> to customize TLSv1.3-specific |
| cipher suites at the server side. |
| See <a href="https://issues.apache.org/jira/browse/KUDU-2871">KUDU-2871</a> for details.</p> |
| </li> |
| <li> |
| <p>TLS ciphers renegotiation for TLSv1.2 and prior protocol versions is now explicitly disabled. |
| See <a href="https://issues.apache.org/jira/browse/KUDU-1926">KUDU-1926</a> for details.</p> |
| </li> |
| <li> |
| <p>The location assignment for Kudu clients is now disabled by default since it doesn’t bring a lot |
| of benefits, but rather puts an extra load to Kudu masters. This change reduces the load on Kudu |
| masters which is essential if too many clients run in a cluster. To enable the location assignment |
| for clients, override the default by setting <code>--master_client_location_assignment_enabled=true</code> for |
| Kudu masters.</p> |
| </li> |
| <li> |
| <p>The behavior of the C++ client replica selection for closest replica, the default, was updated to |
| match the behavior of the Java client. Instead of picking a random replica each time, a static value |
| is used for each process ensuring that the selection remains deterministic and can benefit from |
| better caching. See <a href="https://issues.apache.org/jira/browse/KUDU-3248">KUDU-3248</a> for details.</p> |
| </li> |
| <li> |
| <p>The Web UI /rpcz endpoint now displays information on whether an RPC connection is protected by |
| TLS, and if so, provides information on the negotiated TLS cipher suite.</p> |
| </li> |
| <li> |
| <p>Tooling requests and C++ client requests bound for leader masters will now be retried in the event |
| the masters cannot be reached.</p> |
| </li> |
| <li> |
| <p>Cluster tooling will now validate that the master argument contains no duplicate values. |
| See <a href="https://issues.apache.org/jira/browse/KUDU-3226">KUDU-3226</a> for details.</p> |
| </li> |
| <li> |
| <p>The error message output by Kudu Java client in an attempt to write into a non-existent table |
| partition now contains the table’s name. |
| See <a href="https://issues.apache.org/jira/browse/KUDU-3267">KUDU-3267</a> for details.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.15.0_fixed_issues"><a class="link" href="#rn_1.15.0_fixed_issues">Fixed Issues</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Fixed a bug in the Kudu tablet servers that could result in a crash when performing an incremental |
| backup of rows that had many batches of updates. |
| See <a href="https://issues.apache.org/jira/browse/KUDU-3291">KUDU-3291</a> for more details.</p> |
| </li> |
| <li> |
| <p>The Kudu Java client will now retry scans bound for tablets hosted on quiescing tablet servers at |
| replicas on other tablet servers. See |
| <a href="https://issues.apache.org/jira/browse/KUDU-3213">KUDU-3213</a> for more details.</p> |
| </li> |
| <li> |
| <p>Fixed a race between the scheduling of a maintenance op and the destruction of a tablet. This |
| could previously lead to a crash. |
| See <a href="https://issues.apache.org/jira/browse/KUDU-3268">KUDU-3268</a> for more details.</p> |
| </li> |
| <li> |
| <p>Fixed crash in Kudu C++ client introduced with KUDU-1802. |
| See <a href="https://issues.apache.org/jira/browse/KUDU-3254">KUDU-3254</a> for details.</p> |
| </li> |
| <li> |
| <p>Fixed bug in Kudu Java client which manifested in <code>AUTO_FLUSH_BACKGROUND</code> sessions hung in a call |
| to <code>KuduSession.flush()</code> method. Another sign of the bug were stuck data ingest workloads based on |
| Java client (e.g., kudu-spark applications) with |
| "java.lang.AssertionError: This Deferred was already called!" message in the logs. |
| See <a href="https://issues.apache.org/jira/browse/KUDU-3277">KUDU-3277</a> for details.</p> |
| </li> |
| <li> |
| <p>Fixed crash in Kudu server due to lack of <code>getrandom(2)</code> system call in Linux kernel version |
| earlier than 3.17 by instead using <code>/dev/random</code> for uuid generation in the Boost library. |
| Crash includes the following message in the logs |
| "terminate called after throwing an instance of 'boost::wrapexcept<boost::uuids::entropy_error>'". |
| See the <a href="https://gerrit.cloudera.org/c/17354/">fix</a> for a sample stack trace.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.15.0_wire_compatibility"><a class="link" href="#rn_1.15.0_wire_compatibility">Wire Protocol compatibility</a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Kudu 1.15.0 is wire-compatible with previous versions of Kudu:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Kudu 1.15 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 1.14 and Kudu 1.15 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 1.15 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 1.15 and versions earlier than 1.3:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>If a Kudu 1.15 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 1.15 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_1.15.0_incompatible_changes"><a class="link" href="#rn_1.15.0_incompatible_changes">Incompatible Changes in Kudu 1.15.0</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Updated hash computation for empty strings in the FastHash implementation to conform with the |
| handling in Apache Impala. For Bloom filter predicate pushdown feature that uses FastHash, |
| this makes the Kudu client older than version 1.15.0 incompatible with Kudu server version 1.15.0 |
| and Kudu client version at or newer than 1.15.0 incompatible with Kudu server version earlier than |
| 1.15.0. Both client library and Kudu server need to be updated to version 1.15.0 or above if using |
| the Bloom filter predicate feature. One manifestation of this incompatibility is following message |
| in the logs, "Not implemented: call requires unsupported application feature flags: 4". |
| See <a href="https://issues.apache.org/jira/browse/KUDU-3286">KUDU-3286</a> for details.</p> |
| </li> |
| </ul> |
| </div> |
| <div class="sect2"> |
| <h3 id="rn_1.15.0_client_compatibility"><a class="link" href="#rn_1.15.0_client_compatibility">Client Library Compatibility</a></h3> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>The Kudu 1.15 Java client library is API- and ABI-compatible with Kudu 1.14. Applications |
| written against Kudu 1.14 will compile and run against the Kudu 1.15 client library and |
| vice-versa.</p> |
| </li> |
| <li> |
| <p>The Kudu 1.15 C++ client is API- and ABI-forward-compatible with Kudu 1.14. |
| Applications written and compiled against the Kudu 1.14 client library will run without |
| modification against the Kudu 1.15 client library. Applications written and compiled |
| against the Kudu 1.15 client library will run without modification against the Kudu 1.14 |
| client library.</p> |
| </li> |
| <li> |
| <p>The Kudu 1.15 Python client is API-compatible with Kudu 1.14. Applications |
| written against Kudu 1.14 will continue to run against the Kudu 1.15 client |
| and vice-versa.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.15.0_known_issues"><a class="link" href="#rn_1.15.0_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_1.15.0_contributors"><a class="link" href="#rn_1.15.0_contributors">Contributors</a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Kudu 1.15.0 includes contributions from 12 people, including 2 first-time contributors:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Abhishek Chennaka</p> |
| </li> |
| <li> |
| <p>shenxingwuying</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>Thank you for your contributions!</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_1.15.0_upgrade_notes">Upgrade Notes</a></li> |
| <li><a href="#rn_1.15.0_obsoletions">Obsoletions</a></li> |
| <li><a href="#rn_1.15.0_deprecations">Deprecations</a></li> |
| <li><a href="#rn_1.15.0_new_features">New features</a></li> |
| <li><a href="#rn_1.15.0_improvements">Optimizations and improvements</a></li> |
| <li><a href="#rn_1.15.0_fixed_issues">Fixed Issues</a></li> |
| <li><a href="#rn_1.15.0_wire_compatibility">Wire Protocol compatibility</a></li> |
| <li><a href="#rn_1.15.0_incompatible_changes">Incompatible Changes in Kudu 1.15.0</a> |
| <ul class="sectlevel2"> |
| <li><a href="#rn_1.15.0_client_compatibility">Client Library Compatibility</a></li> |
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