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| <h1><a href="https://issues.apache.org/jira/browse/HDDS-4470">[HDDS-4470]</a> Ozone Manager Prepare for Upgrade (implemented) </h1> |
| <div><i>Authors: Aravindan Vijayan</i><div class="pull-right">2021-02-15</div></div> |
| <p> </p> |
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| ‘Prepare upgrade’ step to make sure all the OMs use the same version of the software to update their DBs (apply transaction) for a given request. |
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| <h1 id="abstract">Abstract</h1> |
| <p>In the context of upgrades, a slow follower presents a problem when there |
| are changes in the OM Ratis request handler logic. This means that when there |
| is a slow follower, it is possible to have different versions of the code |
| processing the request at different OM nodes causing problems from DB divergence |
| to unexpected crashes. For example, a leader could have “applied” a transaction |
| in the older OM version, while a slow follower who has the request in its logs |
| may apply it after the upgrade.</p> |
| <p>The objective of the ‘Prepare upgrade’ step is to make sure all the OMs use |
| the same version of the software to update their DBs (apply transaction) for a given request.</p> |
| <p>To ensure this, we need to make sure that</p> |
| <ul> |
| <li>For every operational OM (at least a quorum of OMs should be operational |
| ), all unapplied transactions should be applied.</li> |
| <li>For an OM that is not operational during the prepare step, it should get a |
| Ratis snapshot (entire OM RocksDB) to get up to speed with the rest of the OMs after the upgrade.</li> |
| </ul> |
| <h1 id="usage">Usage</h1> |
| <h2 id="how-do-you-prepare-an-ozone-manager-quorum">How do you prepare an Ozone manager quorum</h2> |
| <pre><code>ozone admin om -id=<om-sevice-id> prepare |
| </code></pre> |
| <p>This leaves the Ozone manager in a state where it cannot accept new writes.</p> |
| <h2 id="how-do-you-cancel-a-prepared-ozone-manager-quorum">How do you cancel a “prepared” Ozone manager quorum</h2> |
| <p>In the case of a cancelled upgrade, the OM can be brought out off the |
| prepared state by using the following command.</p> |
| <pre><code>ozone admin om -id=<om-sevice-id> cancelprepare |
| </code></pre> |
| <h1 id="link">Link</h1> |
| <p><a href="https://issues.apache.org/jira/secure/attachment/13015491/OM%20Prepare%20Upgrade.pdf">https://issues.apache.org/jira/secure/attachment/13015491/OM%20Prepare%20Upgrade.pdf</a></p> |
| <p><a href="https://issues.apache.org/jira/secure/attachment/13015411/OM%20Prepare%20Upgrade%2CDowngrade.jpg">https://issues.apache.org/jira/secure/attachment/13015411/OM%20Prepare%20Upgrade%2CDowngrade.jpg</a></p> |
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