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| |
| <h1>Apache Kudu 1.6.0 Release Notes</h1> |
| <div class="sect1"> |
| <h2 id="rn_1.6.0_upgrade_notes"><a class="link" href="#rn_1.6.0_upgrade_notes">Upgrade Notes</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Upgrading directly from Kudu 1.5.0 is supported and no special upgrade steps |
| are required. A rolling upgrade may work, however it has not been tested. |
| When upgrading Kudu, it is recommended to first shut down all Kudu processes |
| across the cluster, then upgrade the software on all servers, then restart |
| the Kudu processes on all servers in the cluster.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.6.0_obsoletions"><a class="link" href="#rn_1.6.0_obsoletions">Obsoletions</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Support for Spark 1 (kudu-spark_2.10) has been <strong>removed</strong> in Kudu 1.6.0 and |
| now only Spark 2 is supported. Spark 1 support was deprecated in Kudu 1.5.0.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.6.0_deprecations"><a class="link" href="#rn_1.6.0_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_1.6.0_new_features"><a class="link" href="#rn_1.6.0_new_features">New features</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Tablet servers' tolerance of disk failures is now enabled by default and has |
| been extended to handle data directory failures at runtime. In the event of |
| a disk failure at runtime, any tablets with data on a failed disk will be |
| shut down and restarted on another tablet server. There is a configurable |
| tradeoff between a newly added tablet’s tolerance to disk failures and its |
| ability to parallelize reads via the experimental |
| <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. By default, tablets are striped across all available |
| disks. Note that the first configured data directory and the WAL directory |
| cannot currently tolerate disk failures. This will be further improved in |
| future Kudu releases.</p> |
| </li> |
| <li> |
| <p>Kudu servers can now adopt new data directories via the new |
| <code>kudu fs update_dirs</code> tool. The new directory will be used by new tablet |
| replicas only. Note that removing directories is not yet supported |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-2202">KUDU-2202</a>).</p> |
| </li> |
| <li> |
| <p>Kudu servers have two new flags to control webui TLS/HTTPS |
| settings: <code>--webserver_tls_ciphers</code> and <code>--webserver_tls_min_protocol</code>. |
| These flags allow the advertised TLS ciphers and TLS protocol versions to be |
| configured. Additionally, the webserver now excludes insecure legacy ciphers |
| by default |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-2190">KUDU-2190</a>).</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>Kudu servers can now tolerate short interruptions in NTP clock |
| synchronization. NTP synchronization is still required when any Kudu daemon |
| starts up. If NTP synchronization is not available, diagnostic information |
| is now logged to help pinpoint the issue |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-1578">KUDU-1578</a>).</p> |
| </li> |
| <li> |
| <p>Tablet server startup time has been improved significantly on servers |
| containing large numbers of blocks.</p> |
| </li> |
| <li> |
| <p>The log block manager now performs disk data deletion in batches. This |
| optimization can significantly reduce the time taken to delete data on a tablet.</p> |
| </li> |
| <li> |
| <p>The usage of sensitive data redaction flag has been slightly changed. By |
| setting <code>--redact=log</code> flag, redaction will be disabled in the web UI but |
| retained for server logs. Alternatively, <code>--redact=none</code> can be used to |
| disable redaction completely.</p> |
| </li> |
| <li> |
| <p>The Spark DataSource integration now can take advantage of scan locality |
| for better scan performance, the scan will take place at the closest replica |
| instead of going to the leader.</p> |
| </li> |
| <li> |
| <p>Various optimizations were made to reduce the 99th percentile latency of |
| writes on the tablet server. This can also improve throughput on certain |
| write workloads, particularly on larger clusters.</p> |
| </li> |
| <li> |
| <p>Kudu may now be configured to ignore system-wide auth_to_local mappings |
| configured in /etc/krb5.conf by setting the configuration flag |
| <code>--use_system_auth_to_local=false</code> |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-2198">KUDU-2198</a>).</p> |
| </li> |
| <li> |
| <p>The performance of the compaction scheduler has been improved. In |
| previous versions, certain types of time series workloads were found to |
| cause compaction scheduling to take tens of seconds. These workloads now |
| schedule compactions an order of magnitude more efficiently.</p> |
| </li> |
| <li> |
| <p>The compaction scheduler has been improved to avoid running a compaction |
| when the benefit of that compaction is extremely small.</p> |
| </li> |
| <li> |
| <p>Tablet servers now consider the health of all replicas of a tablet before |
| deciding to evict one. This can improve stability of the Kudu cluster after |
| experiencing multiple simultaneous daemon failures |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-2048">KUDU-2048</a>).</p> |
| </li> |
| <li> |
| <p>Several performance improvements have been made to the Kudu master, |
| particularly in concurrency of clients opening tables. This should improve |
| performance in highly concurrent workloads.</p> |
| </li> |
| <li> |
| <p>The on-disk size metric for a tablet now includes all data and metadata. |
| Previously, it excluded WAL segments and consensus metadata |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-1755">KUDU-1755</a>).</p> |
| </li> |
| <li> |
| <p>Added verbose mode for the 'kudu cluster ksck' command to enable output |
| of detailed information on the cluster’s metadata, even when no errors are |
| detected.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.6.0_fixed_issues"><a class="link" href="#rn_1.6.0_fixed_issues">Fixed Issues</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>HybridTime timestamp propagation now works in the Java client when using scan |
| tokens (see <a href="https://issues.apache.org/jira/browse/KUDU-1411">KUDU-1411</a>).</p> |
| </li> |
| <li> |
| <p>Fixed an error message commonly found in tablet server logs indicating that |
| operations were being read "from the future" |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-1078">KUDU-1078</a>).</p> |
| </li> |
| <li> |
| <p>Tombstoned tablets no longer report metrics |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-2044">KUDU-2044</a>).</p> |
| </li> |
| <li> |
| <p>Fixed a bug in the C++ client which could cause tablets to be erroneously |
| pruned, or skipped, during certain scans, resulting in fewer results than |
| expected being returned from queries. The bug only affected tables whose range |
| partition columns are a proper prefix of the primary key |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-2173">KUDU-2173</a>).</p> |
| </li> |
| <li> |
| <p>Published Kudu Java artifacts are now fully compatible with JRE 7 and JRE 8. |
| There was previously a bug in the release process which made them compatible |
| only with JRE 8 |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-2188">KUDU-2188</a>).</p> |
| </li> |
| <li> |
| <p>Fixed a typo in the list of default TLS ciphers used by Kudu servers. As a |
| result, two additional cipher suites are now available:</p> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>ECDHE-RSA-AES128-SHA256 TLSv1.2 Kx=ECDH Au=RSA Enc=AES(128) Mac=SHA256</p> |
| </li> |
| <li> |
| <p>AES256-GCM-SHA384 TLSv1.2 Kx=RSA Au=RSA Enc=AESGCM(256) Mac=AEAD</p> |
| </li> |
| </ul> |
| </div> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.6.0_wire_compatibility"><a class="link" href="#rn_1.6.0_wire_compatibility">Wire Protocol compatibility</a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Kudu 1.6.0 is wire-compatible with previous versions of Kudu:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Kudu 1.6 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 1.5 and Kudu 1.6 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 1.6 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 1.6 and versions earlier than 1.3:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>If a Kudu 1.6 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 1.6 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_1.6.0_incompatible_changes"><a class="link" href="#rn_1.6.0_incompatible_changes">Incompatible Changes in Kudu 1.6.0</a></h2> |
| <div class="sectionbody"> |
| <div class="sect2"> |
| <h3 id="rn_1.6.0_client_compatibility"><a class="link" href="#rn_1.6.0_client_compatibility">Client Library Compatibility</a></h3> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>The Kudu 1.6 Java client library is API- and ABI-compatible with Kudu 1.5. Applications |
| written against Kudu 1.5 will compile and run against the Kudu 1.6 client library and |
| vice-versa.</p> |
| </li> |
| <li> |
| <p>The Kudu 1.6 C++ client is API- and ABI-forward-compatible with Kudu 1.5. |
| Applications written and compiled against the Kudu 1.5 client library will run without |
| modification against the Kudu 1.6 client library. Applications written and compiled |
| against the Kudu 1.6 client library will run without modification against the Kudu 1.5 |
| client library.</p> |
| </li> |
| <li> |
| <p>The Kudu 1.6 Python client is API-compatible with Kudu 1.5. Applications |
| written against Kudu 1.5 will continue to run against the Kudu 1.6 client |
| and vice-versa.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.6.0_known_issues"><a class="link" href="#rn_1.6.0_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_1.6.0_contributors"><a class="link" href="#rn_1.6.0_contributors">Contributors</a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Kudu 1.6 includes contributions from 14 people, including one |
| first-time contributor, Hector Camarena.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Thanks for helping to make 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_1.6.0_upgrade_notes">Upgrade Notes</a></li> |
| <li><a href="#rn_1.6.0_obsoletions">Obsoletions</a></li> |
| <li><a href="#rn_1.6.0_deprecations">Deprecations</a></li> |
| <li><a href="#rn_1.6.0_new_features">New features</a></li> |
| <li><a href="#_optimizations_and_improvements">Optimizations and improvements</a></li> |
| <li><a href="#rn_1.6.0_fixed_issues">Fixed Issues</a></li> |
| <li><a href="#rn_1.6.0_wire_compatibility">Wire Protocol compatibility</a></li> |
| <li><a href="#rn_1.6.0_incompatible_changes">Incompatible Changes in Kudu 1.6.0</a> |
| <ul class="sectlevel2"> |
| <li><a href="#rn_1.6.0_client_compatibility">Client Library Compatibility</a></li> |
| </ul> |
| </li> |
| <li><a href="#rn_1.6.0_known_issues">Known Issues and Limitations</a></li> |
| <li><a href="#rn_1.6.0_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> |
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