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| <meta property="og:description" content="The Apache Flink community released the first bugfix release of the Stateful Functions (StateFun) 2.2 series, version 2.2.1. |
| This release fixes a critical bug that causes restoring the Stateful Functions cluster from snapshots (checkpoints or savepoints) to fail under certain conditions. Starting from this release, StateFun now creates snapshots with a more robust format that allows it to be restored safely going forward. |
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| <h1> |
| <a href="/2020/11/11/stateful-functions-2.2.1-release-announcement/">Stateful Functions 2.2.1 Release Announcement</a> |
| </h1> |
| |
| |
| |
| November 11, 2020 - |
| |
| |
| |
| Tzu-Li (Gordon) Tai |
| |
| <a href="https://twitter.com/tzulitai">(@tzulitai)</a> |
| |
| |
| |
| |
| <p><p>The Apache Flink community released the first bugfix release of the Stateful Functions (StateFun) 2.2 series, version 2.2.1.</p> |
| <p>This release fixes a critical bug that causes restoring the Stateful Functions cluster from snapshots (checkpoints or |
| savepoints) to fail under certain conditions. Starting from this release, StateFun now creates snapshots with a more |
| robust format that allows it to be restored safely going forward.</p> |
| <p><b><i>We strongly recommend all users to upgrade to 2.2.1</i></b>. Please see the following sections on instructions and things to |
| keep in mind for this upgrade.</p> |
| <h2 id="for-new-users-just-starting-out-with-stateful-functions"> |
| For new users just starting out with Stateful Functions |
| <a class="anchor" href="#for-new-users-just-starting-out-with-stateful-functions">#</a> |
| </h2> |
| <p>We strongly recommend to skip all previous versions and start using StateFun from version 2.2.1. |
| This guarantees that failure recovery from checkpoints, or application upgrades using savepoints will work as expected for you.</p> |
| <h2 id="for-existing-users-on-versions--220"> |
| For existing users on versions <= 2.2.0 |
| <a class="anchor" href="#for-existing-users-on-versions--220">#</a> |
| </h2> |
| <p>Users that are currently using older versions of StateFun may or may not be able to directly upgrade to 2.2.1 using |
| savepoints taken with the older versions. <b>The Flink community is working hard on a follow-up hotfix release, 2.2.2, |
| that would guarantee that you can perform the upgrade smoothly</b>. For the meantime, you may still try to upgrade to 2.2.1 |
| first, but may encounter <a href="https://issues.apache.org/jira/browse/FLINK-19741">FLINK-19741</a> or |
| <a href="https://issues.apache.org/jira/browse/FLINK-19748">FLINK-19748</a>. If you do encounter this, do not worry about data |
| loss; this simply means that the restore failed, and you’d have to wait until 2.2.2 is out in order to upgrade.</p> |
| <p>The follow-up hotfix release 2.2.2 is expected to be ready within another 2~3 weeks, as it <a href="http://apache-flink-mailing-list-archive.1008284.n3.nabble.com/DISCUSS-Releasing-Apache-Flink-1-11-3-td45989.html">requires a new hotfix release |
| from Flink core</a>, |
| and ultimately an upgrade of the Flink dependency in StateFun. We’ll update the community via the Flink |
| mailing lists as soon as this is ready, so please subscribe to the mailing lists for important updates for this!</p> |
| <hr> |
| <p>You can find the binaries on the updated <a href="/downloads.html">Downloads page</a>.</p> |
| <p>This release includes 6 fixes and minor improvements since StateFun 2.2.0. Below is a detailed list of all fixes and improvements:</p> |
| <h2> Bug |
| </h2> |
| <ul> |
| <li>[<a href='https://issues.apache.org/jira/browse/FLINK-19515'>FLINK-19515</a>] - Async RequestReply handler concurrency bug |
| </li> |
| <li>[<a href='https://issues.apache.org/jira/browse/FLINK-19692'>FLINK-19692</a>] - Can't restore feedback channel from savepoint |
| </li> |
| <li>[<a href='https://issues.apache.org/jira/browse/FLINK-19866'>FLINK-19866</a>] - FunctionsStateBootstrapOperator.createStateAccessor fails due to uninitialized runtimeContext |
| </li> |
| </ul> |
| <h2> Improvement |
| </h2> |
| <ul> |
| <li>[<a href='https://issues.apache.org/jira/browse/FLINK-19826'>FLINK-19826</a>] - StateFun Dockerfile copies plugins with a specific version instead of a wildcard |
| </li> |
| <li>[<a href='https://issues.apache.org/jira/browse/FLINK-19827'>FLINK-19827</a>] - Allow the harness to start with a user provided Flink configuration |
| </li> |
| <li>[<a href='https://issues.apache.org/jira/browse/FLINK-19840'>FLINK-19840</a>] - Add a rocksdb and heap timers configuration validation |
| </li> |
| </ul> |
| </p> |
| </article> |
| |
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