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markdown"><header><h1>Upgrade</h1></header><blockquote><p>If you have questions about upgrades (or need help), please feel free to reach out to us by <!-- -->[mailing list]<!-- -->({{ community/mailing-lists) or <!-- -->[Slack Channel]<!-- -->({{ community/slack).</p></blockquote><h2 class="anchor anchorWithStickyNavbar_LWe7" id="overview">Overview<a href="#overview" class="hash-link" aria-label="Direct link to Overview" title="Direct link to Overview"></a></h2><p>Consider the below guidelines in preparation for upgrading.</p><ul><li>Always back up all your configuration files before upgrading.</li><li>Read through the documentation and draft an upgrade plan that matches your specific requirements and environment before starting the upgrade process. | |
| Put differently, don't start working through the guide on a live cluster. Read guide entirely, make a plan, then execute the plan.</li><li>Pay careful consideration to the order in which components are upgraded. In general, you need to upgrade bookies first and then upgrade your clients.</li><li>If autorecovery is running along with bookies, you need to pay attention to the upgrade sequence.</li><li>Read the release notes carefully for each release. They contain not only information about noteworthy features, but also changes to configurations | |
| that may impact your upgrade.</li><li>Always upgrade one or a small set of bookies to canary new version before upgraing all bookies in your cluster.</li></ul><h2 class="anchor anchorWithStickyNavbar_LWe7" id="canary">Canary<a href="#canary" class="hash-link" aria-label="Direct link to Canary" title="Direct link to Canary"></a></h2><p>It is wise to canary an upgraded version in one or small set of bookies before upgrading all bookies in your live cluster.</p><p>You can follow below steps on how to canary a upgraded version:</p><ol><li>Stop a Bookie.</li><li>Upgrade the binary and configuration.</li><li>Start the Bookie in <code>ReadOnly</code> mode. This can be used to verify if the Bookie of this new version can run well for read workload.</li><li>Once the Bookie is running at <code>ReadOnly</code> mode successfully for a while, restart the Bookie in <code>Write/Read</code> mode.</li><li>After step 4, the Bookie will serve both write and read traffic.</li></ol><h3 class="anchor anchorWithStickyNavbar_LWe7" id="rollback-canaries">Rollback Canaries<a href="#rollback-canaries" class="hash-link" aria-label="Direct link to Rollback Canaries" title="Direct link to Rollback Canaries"></a></h3><p>If problems occur during canarying an upgraded version, you can simply take down the problematic Bookie node. The remain bookies in the old cluster | |
| will repair this problematic bookie node by autorecovery. Nothing needs to be worried about.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="upgrade-steps">Upgrade Steps<a href="#upgrade-steps" class="hash-link" aria-label="Direct link to Upgrade Steps" title="Direct link to Upgrade Steps"></a></h2><p>Once you determined a version is safe to upgrade in a few nodes in your cluster, you can perform following steps to upgrade all bookies in your cluster.</p><ol><li>Determine if autorecovery is running along with bookies. If yes, check if the clients (either new clients with new binary or old clients with new configurations) | |
| are allowed to talk to old bookies; if clients are not allowed to talk to old bookies, please <a href="/docs/4.5.1/reference/cli/#autorecovery-1">disable autorecovery</a> during upgrade.</li><li>Decide on performing a rolling upgrade or a downtime upgrade.</li><li>Upgrade all Bookies (more below)</li><li>If autorecovery was disabled during upgrade, <a href="/docs/4.5.1/reference/cli/#autorecovery-1">enable autorecovery</a>.</li><li>After all bookies are upgraded, build applications that use <code>BookKeeper client</code> against the new bookkeeper libraries and deploy the new versions.</li></ol><h3 class="anchor anchorWithStickyNavbar_LWe7" id="upgrade-bookies">Upgrade Bookies<a href="#upgrade-bookies" class="hash-link" aria-label="Direct link to Upgrade Bookies" title="Direct link to Upgrade Bookies"></a></h3><p>In a rolling upgrade scenario, upgrade one Bookie at a time. In a downtime upgrade scenario, take the entire cluster down, upgrade each Bookie, then start the cluster.</p><p>For each Bookie:</p><ol><li>Stop the bookie. </li><li>Upgrade the software (either new binary or new configuration)</li><li>Start the bookie.</li></ol><h2 class="anchor anchorWithStickyNavbar_LWe7" id="upgrade-guides">Upgrade Guides<a href="#upgrade-guides" class="hash-link" aria-label="Direct link to Upgrade Guides" title="Direct link to Upgrade Guides"></a></h2><p>We describes the general upgrade method in Apache BookKeeper as above. We will cover the details for individual versions.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="44x-to-45x-upgrade">4.4.x to 4.5.x upgrade<a href="#44x-to-45x-upgrade" class="hash-link" aria-label="Direct link to 4.4.x to 4.5.x upgrade" title="Direct link to 4.4.x to 4.5.x upgrade"></a></h3><p>There isn't any protocol related backward compabilities changes in 4.5.0. So you can follow the general upgrade sequence to upgrade from 4.4.x to 4.5.x. | |
| However, we list a list of things that you might want to know.</p><ol><li>4.5.x upgrades netty from 3.x to 4.x. The memory usage pattern might be changed a bit. Netty 4 uses more direct memory. Please pay attention to your memory usage | |
| and adjust the JVM settings accordingly.</li><li><code>multi journals</code> is a non-rollbackable feature. If you configure a bookie to use multiple journals on 4.5.x you can not roll the bookie back to use 4.4.x. You have | |
| to take a bookie out and recover it if you want to rollback to 4.4.x.</li></ol><p>If you are planning to upgrade a non-secured cluster to a secured cluster enabling security features in 4.5.0, please read <a href="/docs/4.5.1/security/overview">BookKeeper Security</a> for more details.</p></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages navigation"><a class="pagination-nav__link pagination-nav__link--prev" href="/docs/4.5.1/admin/metrics"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Metric collection</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/4.5.1/api/overview"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">BookKeeper API</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#overview" 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