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| <h1 class="entry-title">Apache Kudu 1.17.0 Released</h1> |
| <p class="meta">Posted 07 Sep 2023 by Yingchun Lai</p> |
| </header> |
| <div class="entry-content"> |
| <p>The Apache Kudu team is happy to announce the release of Kudu 1.17.0!</p> |
| |
| <p>The new release adds several new features and improvements, including the |
| following:</p> |
| |
| <!--more--> |
| |
| <ul> |
| <li> |
| <p>Kudu now supports encrypting data at rest. Kudu supports <code class="language-plaintext highlighter-rouge">AES-128-CTR</code>, <code class="language-plaintext highlighter-rouge">AES-192-CTR</code>, and |
| <code class="language-plaintext highlighter-rouge">AES-256-CTR</code> ciphers to encrypt data, supports Apache Ranger KMS and Apache Hadoop KMS. See |
| <a href="https://kudu.apache.org/docs/security.html#_data_at_rest">Data at rest</a> for more details.</p> |
| </li> |
| <li> |
| <p>Kudu now supports range-specific hash schemas for tables. It’s now possible to add ranges with |
| their own unique hash schema independent of the table-wide hash schema. This can be done at table |
| creation time and while altering the table. It’s controlled by the <code class="language-plaintext highlighter-rouge">--enable_per_range_hash_schemas</code> |
| master flag which is enabled by default (see |
| <a href="https://issues.apache.org/jira/browse/KUDU-2671">KUDU-2671</a>).</p> |
| </li> |
| <li> |
| <p>Kudu now supports soft-deleted tables. Kudu keeps a soft-deleted table aside for a period of time |
| (a.k.a. reservation), not purging the data yet. The table can be restored/recalled back before its |
| reservation expires. The reservation period can be customized via Kudu client API upon |
| soft-deleting the table. The default reservation period is controlled by the |
| <code class="language-plaintext highlighter-rouge">--default_deleted_table_reserve_seconds</code> master’s flag. |
| NOTE: As of Kudu 1.17 release, the soft-delete functionality is not supported when HMS integration |
| is enabled, but this should be addressed in a future release (see |
| <a href="https://issues.apache.org/jira/browse/KUDU-3326">KUDU-3326</a>).</p> |
| </li> |
| <li> |
| <p>Introduced <code class="language-plaintext highlighter-rouge">Auto-Incrementing</code> column. An auto-incrementing column is populated on the server side |
| with a monotonically increasing counter. The counter is local to every tablet, i.e. each tablet has |
| a separate auto incrementing counter (see |
| <a href="https://issues.apache.org/jira/browse/KUDU-1945">KUDU-1945</a>).</p> |
| </li> |
| <li> |
| <p>Kudu now supports experimental non-unique primary key. When a table with non-unique primary key is |
| created, an <code class="language-plaintext highlighter-rouge">Auto-Incrementing</code> column named <code class="language-plaintext highlighter-rouge">auto_incrementing_id</code> is added automatically to the |
| table as the key column. The non-unique key columns and the <code class="language-plaintext highlighter-rouge">Auto-Incrementing</code> column together form |
| the effective primary key (see <a href="https://issues.apache.org/jira/browse/KUDU-1945">KUDU-1945</a>).</p> |
| </li> |
| <li> |
| <p>Introduced <code class="language-plaintext highlighter-rouge">Immutable</code> column. It’s useful to represent a semantically constant entity (see |
| <a href="https://issues.apache.org/jira/browse/KUDU-3353">KUDU-3353</a>).</p> |
| </li> |
| <li> |
| <p>An experimental feature is added to Kudu that allows it to automatically rebalance tablet leader |
| replicas among tablet servers. The background task can be enabled by setting the |
| <code class="language-plaintext highlighter-rouge">--auto_leader_rebalancing_enabled</code> flag on the Kudu masters. By default, the flag is set to ‘false’ |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-3390">KUDU-3390</a>).</p> |
| </li> |
| <li> |
| <p>Introduced an experimental feature: authentication of Kudu client applications to Kudu servers |
| using JSON Web Tokens (JWT). The JWT-based authentication can be used as an alternative to Kerberos |
| authentication for Kudu applications running at edge nodes where configuring Kerberos might be |
| cumbersome. Similar to Kerberos credentials, a JWT is considered a primary client’s credentials. |
| The server-side capability of JWT-based authentication is controlled by the |
| <code class="language-plaintext highlighter-rouge">--enable_jwt_token_auth</code> flag (set ‘false’ by default). When the flat set to ‘true’, a Kudu server |
| is capable of authenticating Kudu clients using the JWT provided by the client during RPC connection |
| negotiation. From its side, a Kudu client authenticates a Kudu server by verifying its TLS |
| certificate. For the latter to succeed, the client should use Kudu client API to add the cluster’s |
| IPKI CA certificate into the list of trusted certificates.</p> |
| </li> |
| <li> |
| <p>The C++ client scan token builder can now create multiple tokens per tablet. So, it’s now possible |
| to dynamically scale the set of readers/scanners fetching data from a Kudu table in parallel. To use |
| this functionality, use the newly introduced <code class="language-plaintext highlighter-rouge">SetSplitSizeBytes()</code> method of the Kudu client API to |
| specify how many bytes of data each token should scan |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-3393">KUDU-3393</a>).</p> |
| </li> |
| <li> |
| <p>Kudu’s default replica placement algorithm is now range and table aware to prevent hotspotting |
| unlike the old power of two choices algorithm. New replicas from the same range are spread evenly |
| across available tablet servers, the table the range belongs to is used as a tiebreaker (see |
| <a href="https://issues.apache.org/jira/browse/KUDU-3476">KUDU-3476</a>).</p> |
| </li> |
| <li> |
| <p>Reduce the memory consumption if there are frequent alter schema operations for tablet servers |
| (see <a href="https://issues.apache.org/jira/browse/KUDU-3197">KUDU-3197</a>).</p> |
| </li> |
| <li> |
| <p>Reduce the memory consumption by implementing memory budgeting for performing RowSet merge |
| compactions (i.e. CompactRowSetsOp maintenance operations). Several flags have been introduced, |
| while the <code class="language-plaintext highlighter-rouge">--rowset_compaction_memory_estimate_enabled</code> flag indicates whether to check for |
| available memory necessary to run CompactRowSetsOp maintenance operations (see |
| <a href="https://issues.apache.org/jira/browse/KUDU-3406">KUDU-3406</a>).</p> |
| </li> |
| </ul> |
| |
| <p>The above is just a list of the highlights, for a more complete list of new |
| features, improvements and fixes please refer to the <a href="/releases/1.17.0/docs/release_notes.html">release |
| notes</a>.</p> |
| |
| <p>The Apache Kudu project only publishes source code releases. To build Kudu |
| 1.17.0, follow these steps:</p> |
| |
| <ul> |
| <li>Download the Kudu <a href="/releases/1.17.0">1.17.0 source release</a></li> |
| <li>Follow the instructions in the documentation to build Kudu <a href="/releases/1.17.0/docs/installation.html#build_from_source">1.17.0 from |
| source</a></li> |
| </ul> |
| |
| <p>For your convenience, binary JAR files for the Kudu Java client library, Spark |
| DataSource, and other Java integrations are published to the ASF Maven |
| repository and are <a href="https://search.maven.org/search?q=g:org.apache.kudu%20AND%20v:1.17.0">now |
| available</a>.</p> |
| |
| <p>The Python client source is also available on |
| <a href="https://pypi.org/project/kudu-python/">PyPI</a>.</p> |
| |
| <p>Additionally, experimental Docker images are published to |
| <a href="https://hub.docker.com/r/apache/kudu">Docker Hub</a>.</p> |
| |
| </div> |
| </article> |
| |
| |
| </div> |
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