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| |
| <h1>Apache Kudu 1.16.0 Release Notes</h1> |
| <div class="sect1"> |
| <h2 id="rn_1.16.0_upgrade_notes"><a class="link" href="#rn_1.16.0_upgrade_notes">Upgrade Notes</a></h2> |
| <div class="sectionbody"> |
| |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.16.0_deprecations"><a class="link" href="#rn_1.16.0_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> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.16.0_new_features"><a class="link" href="#rn_1.16.0_new_features">New features</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Clients can now require authentication and encryption instead of depending on |
| server-side settings |
| (<a href="https://issues.apache.org/jira/browse/KUDU-1921">KUDU-1921</a>).</p> |
| </li> |
| <li> |
| <p>Kudu Masters now automatically attempt to add themselves to an existing |
| cluster if there is a healthy Raft quorum among Kudu Masters.</p> |
| </li> |
| <li> |
| <p>A new tool <code>kudu master unsafe_rebuild</code> is added to reconstruct the master |
| catalog from tablet metadata collected from tablet servers. This can be used |
| in emergencies to restore access to tables when all masters are unavailable.</p> |
| </li> |
| <li> |
| <p>A new tool <code>kudu table set_replication_factor</code> is added to alter the |
| replication factor of a table. The tool immediately updates table metadata in |
| the master, and the master will asynchronously effect the new replication |
| factor. Progress can be monitored by running <code>ksck</code>.</p> |
| </li> |
| <li> |
| <p>It’s now possible to require a minimum replication factor for a Kudu table. |
| This can be achieved by customizing the setting for the newly introduced |
| <code>--min_num_replicas</code> kudu-master’s flag. For example, setting |
| <code>--min_num_replicas=3</code> enforces every newly created table to have at least 3 |
| replicas for each of its tablets, so there cannot be a data loss when just a |
| single tablet server in the cluster fails irrecoverably. For the sake of |
| backward compatibility, <code>--min_num_replicas</code> is set to 1 by default.</p> |
| </li> |
| <li> |
| <p>It’s now possible to track startup progress on the <code>/startup</code> page on the web |
| UI. There are also metrics added to track the overall server startup progress |
| as well as the processing of the log block containers and starting of the |
| tablets (<a href="https://issues.apache.org/jira/browse/KUDU-1959">KUDU-1959</a>).</p> |
| </li> |
| <li> |
| <p>A new tool <code>kudu table add_column</code> is added to add columns to existing tables |
| using the CLI |
| (<a href="https://issues.apache.org/jira/browse/KUDU-3339">KUDU-3339</a>).</p> |
| </li> |
| <li> |
| <p>A new tool <code>kudu tserver unregister</code> is added to remove a dead tablet server |
| from the cluster without restarting the masters |
| (<a href="https://issues.apache.org/jira/browse/KUDU-2915">KUDU-2915</a>).</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.16.0_improvements"><a class="link" href="#rn_1.16.0_improvements">Optimizations and improvements</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Kudu will now more aggressively fsync consensus-related metadata when metadata |
| is configured to be on an XFS mount. This may lead to increased contention on |
| the device that backs metadata, but will prevent corruption in the event of an |
| outage (<a href="https://issues.apache.org/jira/browse/KUDU-2195">KUDU-2195</a>).</p> |
| </li> |
| <li> |
| <p>A clearer message is logged when the Ranger subprocess crashes, to specify a |
| problem with the Ranger client.</p> |
| </li> |
| <li> |
| <p>Two new flags have been introduced for the <code>kudu table scan</code> and <code>kudu perf |
| table_scan</code> CLI tools: <code>--row_count_only</code> and <code>--report_scanner_stats</code>. With |
| these new flags, the above mentioned CLI tools allow to issue scan requests |
| equivalent to running “SELECT COUNT(1) FROM <table_name>” from impala-shell. |
| These new provisions are useful in detecting and troubleshooting scan |
| performance issues.</p> |
| </li> |
| <li> |
| <p>Added replica selection configuration knob for the <code>kudu table scan</code> and <code>kudu |
| perf table_scan</code> CLI tools: it’s controlled by the <code>--replica_selection</code> flag.</p> |
| </li> |
| <li> |
| <p>To improve security, the following flags are now marked as sensitive and will |
| be redacted in the logs and WebUI when the redaction is enabled:</p> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><code>--webserver_private_key_file</code></p> |
| </li> |
| <li> |
| <p><code>--webserver_private_key_password_cmd</code></p> |
| </li> |
| <li> |
| <p><code>--webserver_password_file</code></p> |
| </li> |
| </ul> |
| </div> |
| </li> |
| <li> |
| <p>The logic to select the effective time source when running with |
| <code>--time_source=auto</code> has been updated. The <code>builtin</code> time source would be |
| auto-selected if a Kudu server runs with <code>--time_source=auto</code> in an |
| environment where the instance detector isn’t aware of dedicated NTP servers |
| AND the <code>--builtin_ntp_servers</code> flag is set to a valid value. Otherwise, if |
| <code>--builtin_ntp_servers</code> flag is set to an empty or invalid value, the |
| effective time source becomes <code>system</code> for platforms supporting the |
| <code>get_ntptime()</code> API, otherwise the catch-all case selects the <code>system_unsync</code> |
| as the time effective source.</p> |
| </li> |
| <li> |
| <p>It is now possible to print or edit PBC files in batch using the <code>kudu pbc</code> |
| CLI tool, and also to format its JSON input/output as “pretty”.</p> |
| </li> |
| <li> |
| <p>Client connection timeout is now configurable in the Java client |
| (<a href="https://issues.apache.org/jira/browse/KUDU-3240">KUDU-3240</a>).</p> |
| </li> |
| <li> |
| <p>A new <code>/healthz</code> endpoint is now available on the kudu-master and tablet-server |
| embedded web servers for liveness checks |
| (<a href="https://issues.apache.org/jira/browse/KUDU-3308">KUDU-3308</a>).</p> |
| </li> |
| <li> |
| <p>Hive Metastore URI is now logged to the console when connecting via <code>kudu hms</code> |
| CLI tool (<a href="https://issues.apache.org/jira/browse/KUDU-3189">KUDU-3189</a>).</p> |
| </li> |
| <li> |
| <p>It is now possible to start up a master when there is an additional master |
| address present in the master addresses flag |
| (<a href="https://issues.apache.org/jira/browse/KUDU-3311">KUDU-3311</a>).</p> |
| </li> |
| <li> |
| <p>Table entity is now accessible in <code>KuduWriteOperation</code> in the C++ client, |
| making understanding errors on the client side easier |
| (<a href="https://issues.apache.org/jira/browse/KUDU-2623">KUDU-2623</a>).</p> |
| </li> |
| <li> |
| <p>The rebalancer tool now doesn’t move replicas to tablet servers in maintenance |
| mode (<a href="https://issues.apache.org/jira/browse/KUDU-3328">KUDU-3328</a>).</p> |
| </li> |
| <li> |
| <p>Improved the performance of the run length encoding (RLE).</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.16.0_fixed_issues"><a class="link" href="#rn_1.16.0_fixed_issues">Fixed Issues</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Log4J used in Ranger subprocess was upgraded to 2.17.1 which contains patches |
| go several security vulnerabilities |
| (<a href="https://nvd.nist.gov/vuln/detail/CVE-2021-44832">CVE-2021-44832</a>, |
| <a href="https://nvd.nist.gov/vuln/detail/CVE-2021-45105">CVE-2021-45105</a>, |
| <a href="https://nvd.nist.gov/vuln/detail/CVE-2021-45046">CVE-2021-45046</a>, and |
| <a href="https://nvd.nist.gov/vuln/detail/CVE-2021-44228">CVE-2021-44228</a>).</p> |
| </li> |
| <li> |
| <p>Kudu servers previously crashed if hostnames became unresolvable via DNS (e.g. |
| if the container hosting a server were destroyed). Such errors are now treated |
| as transient and the lookups are retried periodically. See |
| <a href="https://issues.apache.org/jira/browse/KUDU-75">KUDU-75</a>, |
| <a href="https://issues.apache.org/jira/browse/KUDU-1620">KUDU-1620</a>, |
| and <a href="https://issues.apache.org/jira/browse/KUDU-1885">KUDU-1885</a> for more details.</p> |
| </li> |
| <li> |
| <p>Fixed an issue in Kudu Java client where concurrent flushing of data buffers |
| could lead to errors reported as 'java.lang.AssertionError: This Deferred was |
| already called' |
| (<a href="https://issues.apache.org/jira/browse/KUDU-3277">KUDU-3277</a>).</p> |
| </li> |
| <li> |
| <p>Fixed Kudu RPC negotiation issue when running with cyrus-sasl-gssapi-2.1.27-5 |
| and newer versions of the RPM package. A failed RPC connection negotiation |
| attempt would result in an error logged along with the full connection |
| negotiation trace: <code>Runtime error: SASL(-15): mechanism too weak for this |
| user: Unable to find a callback: 32775</code> |
| (<a href="https://issues.apache.org/jira/browse/KUDU-3297">KUDU-3297</a>).</p> |
| </li> |
| <li> |
| <p>Fixed crash in kudu-master and kudu-tserver when running with kernel where the |
| <code>getrandom(2)</code> API is not available (versions of Linux kernel prior to 3.17).</p> |
| </li> |
| <li> |
| <p>Fixed bug which could lead to exhaustion of the address space for the outgoing |
| connections on a busy Kudu cluster |
| (<a href="https://issues.apache.org/jira/browse/KUDU-3352">KUDU-3352</a>).</p> |
| </li> |
| <li> |
| <p>Fixed a bug in the Java client where a malformed tablet server ID in the scan |
| token causes connection failures and timeouts in some cases |
| (<a href="https://issues.apache.org/jira/browse/KUDU-3349">KUDU-3349</a>).</p> |
| </li> |
| <li> |
| <p>Fixed a bug where the rebalancer failed with <code>-ignored_tservers</code> flag |
| (<a href="https://issues.apache.org/jira/browse/KUDU-3346">KUDU-3346</a>).</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.16.0_wire_compatibility"><a class="link" href="#rn_1.16.0_wire_compatibility">Wire Protocol compatibility</a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Kudu 1.16.0 is wire-compatible with previous versions of Kudu:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Kudu 1.16 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 1.15 and Kudu 1.16 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 1.16 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 1.16 and versions earlier than 1.3:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>If a Kudu 1.16 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 1.16 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_1.16.0_incompatible_changes"><a class="link" href="#rn_1.16.0_incompatible_changes">Incompatible Changes in Kudu 1.16.0</a></h2> |
| <div class="sectionbody"> |
| <div class="sect2"> |
| <h3 id="rn_1.16.0_client_compatibility"><a class="link" href="#rn_1.16.0_client_compatibility">Client Library Compatibility</a></h3> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>The Kudu 1.16 Java client library is API- and ABI-compatible with Kudu 1.15. Applications |
| written against Kudu 1.15 will compile and run against the Kudu 1.16 client library and |
| vice-versa.</p> |
| </li> |
| <li> |
| <p>The Kudu 1.16 C++ client is API- and ABI-forward-compatible with Kudu 1.15. |
| Applications written and compiled against the Kudu 1.15 client library will run without |
| modification against the Kudu 1.16 client library. Applications written and compiled |
| against the Kudu 1.16 client library will run without modification against the Kudu 1.15 |
| client library.</p> |
| </li> |
| <li> |
| <p>The Kudu 1.16 Python client is API-compatible with Kudu 1.15. Applications |
| written against Kudu 1.15 will continue to run against the Kudu 1.16 client |
| and vice-versa.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="rn_1.16.0_known_issues"><a class="link" href="#rn_1.16.0_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_1.16.0_contributors"><a class="link" href="#rn_1.16.0_contributors">Contributors</a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Kudu 1.16.0 includes contributions from 17 people, including 5 first-time contributors:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Riza Suminto</p> |
| </li> |
| <li> |
| <p>Zoltan Chovan</p> |
| </li> |
| <li> |
| <p>kedeng</p> |
| </li> |
| <li> |
| <p>khazarmammadli</p> |
| </li> |
| <li> |
| <p>yejiabao</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>Thank you for your contributions!</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"> |
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