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| |
| <h1>Apache Kudu 1.14.0 Release Notes</h1> |
| <div class="sect1"> |
| <h2 id="rn_1.14.0_upgrade_notes"><a class="link" href="#rn_1.14.0_upgrade_notes">Upgrade Notes</a></h2> |
| <div class="sectionbody"> |
| |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.14.0_obsoletions"><a class="link" href="#rn_1.14.0_obsoletions">Obsoletions</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Support for CentOS 6/RHEL 6, Ubuntu 14, Ubuntu 16, and Debian 8 platforms has been dropped |
| given they are at or near end-of-life. We will no longer validate these platforms as a |
| part of the release process, though patches will still be accepted going forward.</p> |
| </li> |
| <li> |
| <p>Developer support for OS X 10.10 Yosemite, OS X 10.11 El Capitan, and OS X 10.12 Sierra |
| has been dropped. We will no longer validate these versions as a part of the release |
| process, though patches will still be accepted going forward.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.14.0_deprecations"><a class="link" href="#rn_1.14.0_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> |
| <li> |
| <p>The <code>kudu-mapreduce</code> integration has been deprecated and may be removed in the |
| next minor release. Similar functionality and capabilities now exist via the |
| Apache Spark, Apache Hive, Apache Impala, and Apache NiFi integrations.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.14.0_new_features"><a class="link" href="#rn_1.14.0_new_features">New features</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Full support for <code>INSERT_IGNORE</code>, <code>UPDATE_IGNORE</code>, and <code>DELETE_IGNORE</code> operations |
| was added. The <code>INSERT_IGNORE</code> operation will insert a row if one matching the key |
| does not exist and ignore the operation if one already exists. The <code>UPDATE_IGNORE</code> |
| operation will update the row if one matching the key exists and ignore the operation |
| if one does not exist. The <code>DELETE_IGNORE</code> operation will delete the row if one matching |
| the key exists and ignore the operation if one does not exist. These operations are |
| particularly useful in situations where retries or duplicate operations could occur and |
| you do not want to handle the errors that could result manually or you do not want to cause |
| unnecessary writes and compaction work as a result of using the <code>UPSERT</code> operation. |
| The Java client can check if the cluster it is communicating with supports these operations |
| by calling the <code>supportsIgnoreOperations()</code> method on the KuduClient. See |
| <a href="https://issues.apache.org/jira/browse/KUDU-1563">KUDU-1563</a> for more details.</p> |
| </li> |
| <li> |
| <p>Spark 3 compatible JARs compiled for Scala 2.12 are now published for the Kudu Spark integration. |
| See <a href="https://issues.apache.org/jira/browse/KUDU-3202">KUDU-3202</a> for more details.</p> |
| </li> |
| <li> |
| <p>Every Kudu cluster now has an automatically generated cluster Id that can be used to uniquely |
| identify a cluster. The cluster Id is shown in the masters web-UI, the <code>kudu master list</code> tool, |
| and in master server logs. See <a href="https://issues.apache.org/jira/browse/KUDU-2574">KUDU-2574</a> |
| for more details.</p> |
| </li> |
| <li> |
| <p>It is now possible to enforce that OpenSSL is initialized in FIPS approved mode in the servers |
| and the C++ client by setting the KUDU_REQUIRE_FIPS_MODE environment variable to “1”, “yes” or |
| “true”. See <a href="https://issues.apache.org/jira/browse/KUDU-3210">KUDU-3210</a> for more details.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.14.0_improvements"><a class="link" href="#rn_1.14.0_improvements">Optimizations and improvements</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Downloading the WAL data and data blocks when copying tablets to another tablet server is now |
| parallelized, resulting in much faster tablet copy operations. These operations occur when |
| recovering from a down tablet server or when running the cluster rebalancer. See |
| <a href="https://issues.apache.org/jira/browse/KUDU-1728">KUDU-1728</a> and |
| <a href="https://issues.apache.org/jira/browse/KUDU-3214">KUDU-3214</a> for more details.</p> |
| </li> |
| <li> |
| <p>The HMS integration now supports multiple Kudu clusters associated with a single HMS |
| including Kudu clusters that do not have HMS synchronization enabled. This is possible, |
| because the Kudu master will now leverage the cluster Id to ignore notifications from |
| tables in a different cluster. Additionally, the HMS plugin will check if the Kudu cluster |
| associated with a table has HMS synchronization enabled. |
| See <a href="https://issues.apache.org/jira/browse/KUDU-3192">KUDU-3192</a> and |
| <a href="https://issues.apache.org/jira/browse/KUDU-3187">KUDU-3187</a> for more details.</p> |
| </li> |
| <li> |
| <p>The HMS integration now supports gzipped HMS notifications. This is important in order to |
| support Hive 4 where the default encoder was changed to be the GzipJSONMessageEncoder. See |
| <a href="https://issues.apache.org/jira/browse/KUDU-3201">KUDU-3201</a> for more details.</p> |
| </li> |
| <li> |
| <p>Kudu will now fail tablet replicas that have been corrupted due to KUDU-2233 instead of |
| crashing the tablet server. If a healthy majority still exists, a new replica will be created |
| and the failed replica will be evicted and deleted. See |
| <a href="https://issues.apache.org/jira/browse/KUDU-3191">KUDU-3191</a> and |
| <a href="https://issues.apache.org/jira/browse/KUDU-2233">KUDU-2233</a> for more details.</p> |
| </li> |
| <li> |
| <p>DeltaMemStores will now be flushed as long as any DMS in a tablet is older than the point |
| defined by <code>--flush_threshold_secs</code>, rather than flushing once every <code>--flush_threshold_secs</code> |
| period. This can reduce memory pressure under update- or delete-heavy workloads, and lower tablet |
| server restart times following such workloads. See |
| <a href="https://issues.apache.org/jira/browse/KUDU-3195">KUDU-3195</a> for more details.</p> |
| </li> |
| <li> |
| <p>The <code>kudu perf loadgen</code> CLI tool now supports <code>UPSERT</code> for storing the generated data into |
| the table. To switch to <code>UPSERT</code> for row operations (instead of default <code>INSERT</code>), add the |
| <code>--use_upsert</code> command-line flag.</p> |
| </li> |
| <li> |
| <p>Users can now specify the level of parallelization when copying a tablet using the |
| <code>kudu local_replica copy_from_remote</code> CLI tool by passing the |
| <code>--tablet_copy_download_threads_nums_per_session</code> argument.</p> |
| </li> |
| <li> |
| <p>The Kudu Masters now discriminate between overlapped and exact duplicate key ranges when adding |
| new partitions, returning <code>Status::AlreadyPresent()</code> for exact range duplicates and |
| <code>Status::InvalidArgument()</code> for otherwise overlapped ones. In prior releases, the master |
| returned <code>Status::InvalidArgument()</code> both in case of duplicate and otherwise overlapped ranges.</p> |
| </li> |
| <li> |
| <p>The handling of an empty list of master addresses in Kudu C++ client has improved. In prior |
| releases, <code>KuduClientBuilder::Build()</code> would hang in <code>ConnectToCluster()</code> if no master addresses |
| were provided. Now, <code>KuduClientBuilder::Build()</code> instantly returns <code>Status::InvalidArgument()</code> |
| in such a case.</p> |
| </li> |
| <li> |
| <p>The connection negotiation timeout for Kudu C client is now programmatically configurable. |
| To customize the connection negotiation timeout, use the newly introduced |
| `KuduClientBuilder::connection_negotiation_timeout()` method in the Kudu C client API.</p> |
| </li> |
| <li> |
| <p>All RPC-related <code>kudu</code> CLI tools now have <code>--negotiation_timeout_ms</code> command line flag to |
| control the client-side connection negotiation timeout. The default value for the new flag is |
| set to 3000 milliseconds for backward compatibility. Keep in mind that the total RPC timeout |
| includes the connection negotiation time, so in general it makes sense to bump <code>--timeout_ms</code> |
| along with <code>--negotiation_timeout_ms</code> by the same delta.</p> |
| </li> |
| <li> |
| <p>Kudu now reports on slow SASL calls (i.e. calls taking more than 250 milliseconds to complete) |
| when connecting to a server. This is to help diagnose issues like described in |
| <a href="https://issues.apache.org/jira/browse/KUDU-3217">KUDU-3217</a>.</p> |
| </li> |
| <li> |
| <p>MaintenanceManager now has a new histogram-based <code>maintenance_op_find_best_candidate_duration</code> |
| metric to capture the stats on how long it takes (in microseconds) to find the best maintenance |
| operation among available candidates. The newly introduced metric can help in diagnosing |
| conditions where MaintenanceManager seems lagging behind the rate of write operations in a busy |
| Kudu cluster with many replicas per tablet server.</p> |
| </li> |
| <li> |
| <p>The KuduScanToken Java API has been extended with a <code>deserializeIntoScannerBuilder()</code> method that |
| can be used to further customize generated tokens.</p> |
| </li> |
| <li> |
| <p>Logging of the error message produced when applying an op while a Java KuduSession is closed |
| has been throttled. See |
| <a href="https://issues.apache.org/jira/browse/KUDU-3012">KUDU-3012</a> for more details.</p> |
| </li> |
| <li> |
| <p>Added a new <code>uptime</code> metric for a Kudu server. The metric’s value is reported as the length of |
| the time interval passed from the start of the server, in microseconds. Knowing the server’s |
| uptime, it’s easier to interpret and compare metrics reported by different Kudu servers.</p> |
| </li> |
| <li> |
| <p>Documentation for Kudu’s metrics are now automatically generated for each release and can be seen |
| <a href="https://kudu.apache.org/docs/metrics_reference.html">here</a>.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.14.0_fixed_issues"><a class="link" href="#rn_1.14.0_fixed_issues">Fixed Issues</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Fixed lock contention between MaintenanceManager op registration and the scheduling of new |
| maintenance ops. On particularly dense tablet servers, this contention was previously shown to |
| significantly slow down startup times. See |
| <a href="https://issues.apache.org/jira/browse/KUDU-3149">KUDU-3149</a> for more details.</p> |
| </li> |
| <li> |
| <p>Fixed lock contention between MaintenanceManager’s threads performing already scheduled |
| operations and the scheduler thread itself. This benefits clusters with heavy ingest/update |
| workloads that have many replicas per tablet server. See |
| <a href="https://issues.apache.org/jira/browse/KUDU-1954">KUDU-1954</a> for more details.</p> |
| </li> |
| <li> |
| <p>Fixed a bug in the merge iterator that could result in a crash. This could surface as a crash |
| when performing ordered or differential scans, particularly when the underlying data contained |
| deletes and reinserts. See |
| <a href="https://issues.apache.org/jira/browse/KUDU-3108">KUDU-3108</a> for more details.</p> |
| </li> |
| <li> |
| <p>Fixed a heap-use-after-free bug in Kudu C++ client that might manifest itself when altering a |
| table to update the partitioning schema. See |
| <a href="https://issues.apache.org/jira/browse/KUDU-3238">KUDU-3238</a> for more details.</p> |
| </li> |
| <li> |
| <p>Fixed a bug where building scan tokens would result in a NullPointerException if a tablet not |
| found error occurred before generating the token. See |
| <a href="https://issues.apache.org/jira/browse/KUDU-3205">KUDU-3205</a> for more details.</p> |
| </li> |
| <li> |
| <p>Fixed a bug where a delete operation would fail if the row being deleted contained exactly |
| 64 columns and all values were set on the row. See |
| <a href="https://issues.apache.org/jira/browse/KUDU-3198">KUDU-3198</a> for more details.</p> |
| </li> |
| <li> |
| <p>Fixed a bug where Slf4j classes were shaded into the Spark integration JARs. See |
| <a href="https://issues.apache.org/jira/browse/KUDU-3157">KUDU-3157</a> for more details.</p> |
| </li> |
| <li> |
| <p>Fixed a bug where the 'kudu hms fix' tool mistakenly reports non-matching master addresses |
| when the addresses are in-fact canonically the same. See |
| <a href="https://issues.apache.org/jira/browse/KUDU-2884">KUDU-2884</a> for more details.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.14.0_wire_compatibility"><a class="link" href="#rn_1.14.0_wire_compatibility">Wire Protocol compatibility</a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Kudu 1.14.0 is wire-compatible with previous versions of Kudu:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Kudu 1.14 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 1.13 and Kudu 1.14 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 1.14 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 1.14 and versions earlier than 1.3:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>If a Kudu 1.14 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 1.14 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_1.14.0_incompatible_changes"><a class="link" href="#rn_1.14.0_incompatible_changes">Incompatible Changes in Kudu 1.14.0</a></h2> |
| <div class="sectionbody"> |
| <div class="sect2"> |
| <h3 id="rn_1.14.0_client_compatibility"><a class="link" href="#rn_1.14.0_client_compatibility">Client Library Compatibility</a></h3> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>The Kudu 1.14 Java client library is API- and ABI-compatible with Kudu 1.13. Applications |
| written against Kudu 1.13 will compile and run against the Kudu 1.14 client library and |
| vice-versa.</p> |
| </li> |
| <li> |
| <p>The Kudu 1.14 C++ client is API- and ABI-forward-compatible with Kudu 1.13. |
| Applications written and compiled against the Kudu 1.13 client library will run without |
| modification against the Kudu 1.14 client library. Applications written and compiled |
| against the Kudu 1.14 client library will run without modification against the Kudu 1.13 |
| client library.</p> |
| </li> |
| <li> |
| <p>The Kudu 1.14 Python client is API-compatible with Kudu 1.13. Applications |
| written against Kudu 1.13 will continue to run against the Kudu 1.14 client |
| and vice-versa.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.14.0_known_issues"><a class="link" href="#rn_1.14.0_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_1.14.0_contributors"><a class="link" href="#rn_1.14.0_contributors">Contributors</a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Kudu 1.14.0 includes contributions from 12 people, including 1 first-time |
| contributors:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>liguohao</p> |
| </li> |
| </ul> |
| </div> |
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| <div class="sect1"> |
| <h2 id="resources_and_next_steps"><a class="link" href="#resources_and_next_steps">Resources</a></h2> |
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| <li> |
| <p><a href="http://kudu.apache.org">Kudu Website</a></p> |
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| <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> |
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| <div class="sect1"> |
| <h2 id="_next_steps"><a class="link" href="#_next_steps">Next Steps</a></h2> |
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| <div class="col-md-3"> |
| |
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| |
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| |
| <a href="index.html">Introducing Kudu</a> |
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| <li> |
| <span class="active-toc">Kudu Release Notes</span> |
| <ul class="sectlevel1"> |
| <li><a href="#rn_1.14.0_upgrade_notes">Upgrade Notes</a></li> |
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| <li><a href="#rn_1.14.0_wire_compatibility">Wire Protocol compatibility</a></li> |
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