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| |
| <h1>Apache Kudu 1.5.0 Release Notes</h1> |
| <div class="sect1"> |
| <h2 id="rn_1.5.0_upgrade_notes"><a class="link" href="#rn_1.5.0_upgrade_notes">Upgrade Notes</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Kudu 1.5 now enables the optional ability to compute, store, and verify |
| checksums on all pieces of data stored on a server by default. Due to |
| storage format changes, downgrading to versions 1.3 or earlier is not |
| supported and will result in an error.</p> |
| </li> |
| <li> |
| <p>Spark 2.2+ requires Java 8 at runtime even though Kudu Spark 2.x integration |
| is Java 7 compatible. Spark 2.2 is the default dependency version as of |
| Kudu 1.5.0.</p> |
| </li> |
| <li> |
| <p>The kudu-spark-tools module has been renamed to kudu-spark2-tools_2.11 in |
| order to include the Spark and Scala base versions. This matches the pattern |
| used in the kudu-spark module and artifacts.</p> |
| </li> |
| <li> |
| <p>To improve security, world-readable Kerberos keytab files are no longer |
| accepted by default. Set <code>--allow_world_readable_credentials=true</code> to override |
| this behavior. See |
| <a href="https://issues.apache.org/jira/browse/KUDU-1955">KUDU-1955</a> for additional |
| details.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.5.0_deprecations"><a class="link" href="#rn_1.5.0_deprecations">Deprecations</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Support for Java 7 is deprecated as of Kudu 1.5.0 and may be removed in |
| the next major release.</p> |
| </li> |
| <li> |
| <p>Support for Spark 1 (kudu-spark_2.10) is deprecated as of Kudu 1.5.0 and may |
| be removed in the next minor release.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.5.0_new_features"><a class="link" href="#rn_1.5.0_new_features">New features</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Tablet servers are now optionally able to tolerate disk failures at |
| startup. This feature is experimental; by default, Kudu will crash if it |
| experiences a disk failure. When enabled, tablets with any data on the failed |
| disk will not be opened and will be replicated as needed. To enable this, set |
| the <code>--suicide_on_eio</code> flag to <code>false</code>. Additionally, there is a configurable |
| tradeoff between a newly added tablet’s tolerance to disk failures and its |
| parallelization of I/O via the <code>--fs_target_data_dirs_per_tablet</code> flag. |
| Tablets that are spread across fewer disks are less likely to be affected by a |
| disk failure, at the cost of reduced parallelism. Note that the first |
| configured data directory and the WAL directory cannot currently tolerate disk |
| failures, and disk failures during run-time are still fatal.</p> |
| </li> |
| <li> |
| <p>Kudu server web UIs have a new configuration dashboard (/config) which |
| provides a high level summary of important security configuration values, such |
| as whether RPC authentication is required, or web server HTTPS encryption is |
| enabled. Other types of configuration will be added in future releases.</p> |
| </li> |
| <li> |
| <p>The <code>kudu</code> command line tool has two new features: <code>kudu tablet move</code> and |
| <code>kudu local_replica data_size</code>. The 'tablet move' tool moves a tablet replica |
| from one tablet server to another, under the condition that the tablet is |
| healthy. An operator can use this tool to rebalance tablet replicas between |
| tablet servers. The 'local replica data size' tool summarizes the space usage |
| of a tablet, breaking it down by type of file, column, and rowset.</p> |
| </li> |
| <li> |
| <p>kudu-client-tools now supports exporting CSV files and importing |
| Apache Parquet files. This feature is unstable and may change APIs and |
| functionality in future releases.</p> |
| </li> |
| <li> |
| <p>kudu-spark-tools now supports importing and exporting CSV, Apache Avro and |
| Apache Parquet files. This feature is unstable and may change APIs and |
| functionality in future releases.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_optimizations_and_improvements"><a class="link" href="#_optimizations_and_improvements">Optimizations and improvements</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>The log block manager now performs disk synchronization in batches. |
| This optimization can significantly reduce the time taken to copy tablet data |
| from one server to another; in one case tablet copy time is reduced by 35%. |
| It also improves the general performance of flushes and compactions.</p> |
| </li> |
| <li> |
| <p>A new feature referred to as "tombstoned voting" is added to the Raft |
| consensus subsystem to allow tablet replicas in the <code>TABLET_DATA_TOMBSTONED</code> |
| state to vote in tablet leader elections. This feature increases Kudu’s |
| stability and availability by improving the likelihood that Kudu will be able |
| to self-heal in more edge-case scenarios, such as when tablet copy operations |
| fail. See <a href="https://issues.apache.org/jira/browse/KUDU-871">KUDU-871</a> for |
| details.</p> |
| </li> |
| <li> |
| <p>The tablet on-disk size metric has been made more accurate. Previously, the |
| metric included only REDO deltas; it now counts all deltas. Additionally, the |
| metric includes the size of bloomfiles, ad hoc indexes, and the tablet |
| superblock. WAL segments and consensus metadata are still not counted. The |
| latter is very small compared to the size of data, but the former may be |
| significant depending on the workload (this will be resolved in a future |
| release).</p> |
| </li> |
| <li> |
| <p>The number of threads used by the Kudu tablet server has been further reduced. |
| Previously, each follower tablet replica used a dedicated thread to detect |
| leader tablet replica failures, and each leader replica used one dedicated |
| thread per follower to send Raft heartbeats to that follower. The work |
| performed by these dedicated threads has been reassigned to other threads. |
| Other improvements were made to facilitate better thread sharing by tablets. |
| For the purpose of capacity planning, expect the Kudu tablet server to create |
| one thread for every five "cold" (i.e. those not servicing writes) tablets, |
| and an additional three threads for every "hot" tablet. This will be further |
| improved upon in future Kudu releases.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.5.0_fixed_issues"><a class="link" href="#rn_1.5.0_fixed_issues">Fixed Issues</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>The Java Kudu client now automatically requests new authentication tokens |
| after expiration. As a result, long-lived Java clients are now supported. See |
| <a href="https://issues.apache.org/jira/browse/KUDU-2013">KUDU-2013</a> for more |
| details.</p> |
| </li> |
| <li> |
| <p>Multiple Kerberos compatibility bugs have been fixed, including support |
| for environments with disabled reverse DNS, FreeIPA compatibility, principal |
| names including uppercase characters, and hosts without a FQDN.</p> |
| </li> |
| <li> |
| <p>A bug in the binary prefix decoder which could cause a tablet server 'check' |
| assertion crash has been fixed. The crash could only be triggered in very |
| specific scenarios; see |
| <a href="https://issues.apache.org/jira/browse/KUDU-2085">KUDU-2085</a> for additional |
| details.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.5.0_wire_compatibility"><a class="link" href="#rn_1.5.0_wire_compatibility">Wire Protocol compatibility</a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Kudu 1.5.0 is wire-compatible with previous versions of Kudu:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Kudu 1.5 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 1.4 and Kudu 1.5 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 1.5 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 1.5 and versions earlier than 1.3:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>If a Kudu 1.5 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 1.5 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_1.5.0_incompatible_changes"><a class="link" href="#rn_1.5.0_incompatible_changes">Incompatible Changes in Kudu 1.5.0</a></h2> |
| <div class="sectionbody"> |
| <div class="sect2"> |
| <h3 id="rn_1.5.0_client_compatibility"><a class="link" href="#rn_1.5.0_client_compatibility">Client Library Compatibility</a></h3> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>The Kudu 1.5 Java client library is API- and ABI-compatible with Kudu 1.4. Applications |
| written against Kudu 1.4 will compile and run against the Kudu 1.5 client library and |
| vice-versa, unless one of the following newly added APIs is used:</p> |
| </li> |
| <li> |
| <p>The Kudu 1.5 C++ client is API- and ABI-forward-compatible with Kudu 1.4. |
| Applications written and compiled against the Kudu 1.4 client library will run without |
| modification against the Kudu 1.5 client library. Applications written and compiled |
| against the Kudu 1.5 client library will run without modification against the Kudu 1.4 |
| client library.</p> |
| </li> |
| <li> |
| <p>The Kudu 1.5 Python client is API-compatible with Kudu 1.4. Applications |
| written against Kudu 1.4 will continue to run against the Kudu 1.5 client |
| and vice-versa.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.5.0_known_issues"><a class="link" href="#rn_1.5.0_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_1.5.0_contributors"><a class="link" href="#rn_1.5.0_contributors">Contributors</a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Kudu 1.5 includes contributions from twenty-four people, including six |
| first-time contributors:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Abhishek Talluri</p> |
| </li> |
| <li> |
| <p>Edward Fancher</p> |
| </li> |
| <li> |
| <p>Michael Ho</p> |
| </li> |
| <li> |
| <p>Sam Okrent</p> |
| </li> |
| <li> |
| <p>Sandish Kumar</p> |
| </li> |
| <li> |
| <p>Sri Sai Kumar Ravipati</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>Thanks!</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_1.5.0_upgrade_notes">Upgrade Notes</a></li> |
| <li><a href="#rn_1.5.0_deprecations">Deprecations</a></li> |
| <li><a href="#rn_1.5.0_new_features">New features</a></li> |
| <li><a href="#_optimizations_and_improvements">Optimizations and improvements</a></li> |
| <li><a href="#rn_1.5.0_fixed_issues">Fixed Issues</a></li> |
| <li><a href="#rn_1.5.0_wire_compatibility">Wire Protocol compatibility</a></li> |
| <li><a href="#rn_1.5.0_incompatible_changes">Incompatible Changes in Kudu 1.5.0</a> |
| <ul class="sectlevel2"> |
| <li><a href="#rn_1.5.0_client_compatibility">Client Library Compatibility</a></li> |
| </ul> |
| </li> |
| <li><a href="#rn_1.5.0_known_issues">Known Issues and Limitations</a></li> |
| <li><a href="#rn_1.5.0_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="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> |
| |
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