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| |
| <h1>Apache Kudu 1.13.0 Release Notes</h1> |
| <div class="sect1"> |
| <h2 id="rn_1.13.0_upgrade_notes"><a class="link" href="#rn_1.13.0_upgrade_notes">Upgrade Notes</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>The Sentry integration has been removed and the Ranger integration should now |
| be used in its place for fine-grained authorization.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.13.0_deprecations"><a class="link" href="#rn_1.13.0_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_1.13.0_new_features"><a class="link" href="#rn_1.13.0_new_features">New features</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Added table ownership support. All newly created tables are automatically |
| owned by the user creating them. It is also possible to change the owner by |
| altering the table. You can also assign privileges to table owners via Apache |
| Ranger (see <a href="https://issues.apache.org/jira/browse/KUDU-3090">KUDU-3090</a>).</p> |
| </li> |
| <li> |
| <p>An experimental feature is added to Kudu that allows it to automatically |
| rebalance tablet replicas among tablet servers. The background task can be |
| enabled by setting the <code>--auto_rebalancing_enabled</code> flag on the Kudu masters. |
| Before starting auto-rebalancing on an existing cluster, the CLI rebalancer |
| tool should be run first (see |
| <a href="https://issues.apache.org/jira/browse/KUDU-2780">KUDU-2780</a>).</p> |
| </li> |
| <li> |
| <p>Bloom filter column predicate pushdown has been added to allow optimized |
| execution of filters which match on a set of column values with a |
| false-positive rate. Support for Impala queries utilizing Bloom filter |
| predicate is available yielding performance improvements of 19% to 30% in TPC-H |
| benchmarks and around 41% improvement for distributed joins across large |
| tables. Support for Spark is not yet available. (see |
| <a href="https://issues.apache.org/jira/browse/KUDU-2483">KUDU-2483</a>).</p> |
| </li> |
| <li> |
| <p>AArch64-based (ARM) architectures are now supported including published Docker |
| images.</p> |
| </li> |
| <li> |
| <p>The Java client now supports the columnar row format returned from the server |
| transparently. Using this format can reduce the server CPU and size of the |
| request over the network for scans. The columnar format can be enabled via the |
| setRowDataFormat() method on the KuduScanner.</p> |
| </li> |
| <li> |
| <p>An experimental feature that can be enabled by setting the |
| <code>--enable_workload_score_for_perf_improvement_ops</code> prioritizes flushing and |
| compacting hot tablets.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.13.0_improvements"><a class="link" href="#rn_1.13.0_improvements">Optimizations and improvements</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Hive metastore synchronization now supports Hive 3 and later.</p> |
| </li> |
| <li> |
| <p>The Spark KuduContext accumulator metrics now track operation counts per table |
| instead of cumulatively for all tables.</p> |
| </li> |
| <li> |
| <p>The <code>kudu local_replica delete</code> CLI tool now accepts multiple tablet |
| identifiers. Along with the newly added <code>--ignore_nonexistent</code> flag, this |
| helps with scripting scenarios when removing multiple tablet replicas from a |
| particular Tablet Server.</p> |
| </li> |
| <li> |
| <p>Both Master’s and Tablet Server’s web UI now displays the name for a service |
| thread pool group at the <code>/threadz</code> page</p> |
| </li> |
| <li> |
| <p>Introduced <code>queue_overflow_rejections_</code> metrics for both Masters and Tablet |
| Servers: number of RPC requests of a particular type dropped due to RPC |
| service queue overflow.</p> |
| </li> |
| <li> |
| <p>Introduced a CoDel-like queue control mechanism for the apply queue. This |
| helps to avoid accumulating too many write requests and timing them out in |
| case of seek-bound workloads (e.g., uniform random inserts). The newly |
| introduced queue control mechanism is disabled by default. To enable it, set |
| the <code>--tablet_apply_pool_overload_threshold_ms</code> Tablet Server’s flag to |
| appropriate value, e.g. 250 (see |
| <a href="https://issues.apache.org/jira/browse/KUDU-1587">KUDU-1587</a>).</p> |
| </li> |
| <li> |
| <p>Java client’s error collector can be resized (see |
| <a href="https://issues.apache.org/jira/browse/KUDU-1422">KUDU-1422</a>).</p> |
| </li> |
| <li> |
| <p>Calls to the Kudu master server are now drastically reduced when using scan |
| tokens. Previously deserializing a scan token would result in a GetTableSchema |
| request and potentially a GetTableLocations request. Now the table schema and |
| location information is serialized into the scan token itself avoiding the |
| need for any requests to the master when processing them.</p> |
| </li> |
| <li> |
| <p>The default size of Master’s RPC queue is now 100 (it was 50 in earlier |
| releases). This is to optimize for use cases where a Kudu cluster has many |
| clients working concurrently.</p> |
| </li> |
| <li> |
| <p>Masters now have an option to cache table location responses. This is |
| targeted for Kudu clusters which have many clients working concurrently. By |
| default, the caching of table location responses is disabled. To enable table |
| location caching, set the proper capacity of the table location cache using |
| Master’s <code>--table_locations_cache_capacity_mb</code> flag (setting to 0 disables the |
| caching). Up to 17% of improvement is observed in GetTableLocations request |
| rate when enabling the caching.</p> |
| </li> |
| <li> |
| <p>Removed lock contention on Raft consensus lock in Tablet Servers while |
| processing a write request. This helps to avoid RPC queue overflows when |
| handling concurrent write requests to the same tablet from multiple clients |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-2727">KUDU-2727</a>).</p> |
| </li> |
| <li> |
| <p>Master’s performance for handling concurrent GetTableSchema requests has been |
| improved. End-to-end tests indicated up to 15% improvement in sustained |
| request rate for high concurrency scenarios.</p> |
| </li> |
| <li> |
| <p>Kudu servers now use protobuf Arena objects to perform all RPC |
| request/response-related memory allocations. This gives a boost for overall |
| RPC performance, and with further optimization the result request rate |
| was increased significantly for certain methods. For example, the result request |
| rate increased up to 25% for Master’s GetTabletLocations() RPC in case of |
| highly concurrent scenarios (see |
| <a href="https://issues.apache.org/jira/browse/KUDU-636">KUDU-636</a>).</p> |
| </li> |
| <li> |
| <p>Tablet Servers now use protobuf Arena for allocating Raft-related runtime |
| structures. This results in substantial reduction of CPU cycles used and |
| increases write throughput (see |
| <a href="https://issues.apache.org/jira/browse/KUDU-636">KUDU-636</a>).</p> |
| </li> |
| <li> |
| <p>Tablet Servers now use protobuf Arena for allocating EncodedKeys to reduce |
| allocator contention and improve memory locality (see |
| <a href="https://issues.apache.org/jira/browse/KUDU-636">KUDU-636</a>).</p> |
| </li> |
| <li> |
| <p>Bloom filter predicate evaluation for scans can be computationally expensive. |
| A heuristic has been added that verifies rejection rate of the supplied Bloom |
| filter predicate below which the Bloom filter predicate is automatically |
| disabled. This helped reduce regression observed with Bloom filter predicate |
| in TPC-H benchmark query #9 (see |
| <a href="https://issues.apache.org/jira/browse/KUDU-3140">KUDU-3140</a>).</p> |
| </li> |
| <li> |
| <p>Improved scan performance of dictionary and plain-encoded string columns by |
| avoiding copying them (see |
| <a href="https://issues.apache.org/jira/browse/KUDU-2844">KUDU-2844</a>).</p> |
| </li> |
| <li> |
| <p>Improved maintenance manager’s heuristics to prioritize larger memstores |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-3180">KUDU-3180</a>).</p> |
| </li> |
| <li> |
| <p>Spark client’s KuduReadOptions now supports setting a snapshot timestamp for |
| repeatable reads with READ_AT_SNAPSHOT consistency mode (see |
| <a href="https://issues.apache.org/jira/browse/KUDU-3177">KUDU-3177</a>).</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.13.0_fixed_issues"><a class="link" href="#rn_1.13.0_fixed_issues">Fixed Issues</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Kudu scans now honor location assignments when multiple tablet servers are |
| co-located with the client.</p> |
| </li> |
| <li> |
| <p>Fixed a bug that caused IllegalArgumentException to be thrown when trying to |
| create a predicate for a DATE column in Kudu Java client (see |
| <a href="https://issues.apache.org/jira/browse/KUDU-3152">KUDU-3152</a>).</p> |
| </li> |
| <li> |
| <p>Fixed a potential race when multiple RPCs work on the same scanner object.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.13.0_wire_compatibility"><a class="link" href="#rn_1.13.0_wire_compatibility">Wire Protocol compatibility</a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Kudu 1.13.0 is wire-compatible with previous versions of Kudu:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Kudu 1.13 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 1.12 and Kudu 1.13 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 1.13 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 1.13 and versions earlier than 1.3:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>If a Kudu 1.13 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 1.13 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_1.13.0_incompatible_changes"><a class="link" href="#rn_1.13.0_incompatible_changes">Incompatible Changes in Kudu 1.13.0</a></h2> |
| <div class="sectionbody"> |
| <div class="sect2"> |
| <h3 id="rn_1.13.0_client_compatibility"><a class="link" href="#rn_1.13.0_client_compatibility">Client Library Compatibility</a></h3> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>The Kudu 1.13 Java client library is API- and ABI-compatible with Kudu 1.12. Applications |
| written against Kudu 1.12 will compile and run against the Kudu 1.13 client library and |
| vice-versa.</p> |
| </li> |
| <li> |
| <p>The Kudu 1.13 C++ client is API- and ABI-forward-compatible with Kudu 1.12. |
| Applications written and compiled against the Kudu 1.12 client library will run without |
| modification against the Kudu 1.13 client library. Applications written and compiled |
| against the Kudu 1.13 client library will run without modification against the Kudu 1.12 |
| client library.</p> |
| </li> |
| <li> |
| <p>The Kudu 1.13 Python client is API-compatible with Kudu 1.12. Applications |
| written against Kudu 1.12 will continue to run against the Kudu 1.13 client |
| and vice-versa.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.13.0_known_issues"><a class="link" href="#rn_1.13.0_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_1.13.0_contributors"><a class="link" href="#rn_1.13.0_contributors">Contributors</a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Kudu 1.13.0 includes contributions from 22 people, including 9 first-time |
| contributors:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Jim Apple</p> |
| </li> |
| <li> |
| <p>Kevin J McCarthy</p> |
| </li> |
| <li> |
| <p>Li Zhiming</p> |
| </li> |
| <li> |
| <p>Mahesh Reddy</p> |
| </li> |
| <li> |
| <p>Romain Rigaux</p> |
| </li> |
| <li> |
| <p>RuiChen</p> |
| </li> |
| <li> |
| <p>Shuping Zhou</p> |
| </li> |
| <li> |
| <p>ningw</p> |
| </li> |
| <li> |
| <p>wenjie</p> |
| </li> |
| </ul> |
| </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_1.13.0_upgrade_notes">Upgrade Notes</a></li> |
| <li><a href="#rn_1.13.0_deprecations">Deprecations</a></li> |
| <li><a href="#rn_1.13.0_new_features">New features</a></li> |
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