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| <h1>Reconfigurability</h1> |
| |
| <!--- |
| Licensed to the Apache Software Foundation (ASF) under one or more |
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| limitations under the License. |
| --> |
| <p>Ozone supports dynamic loading of certain properties without restarting the service. |
| If a property is reconfigurable, you can modify it in the configuration file (<code>ozone-site.xml</code>) and then invoke the command to flush it to memory.</p> |
| <p>command:</p> |
| <div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-shell" data-lang="shell">ozone admin reconfig --service<span style="color:#f92672">=[</span>OM|SCM|DATANODE<span style="color:#f92672">]</span> --address<span style="color:#f92672">=</span><ip:port> start|status|properties |
| </code></pre></div><p>The meaning of command options:</p> |
| <ul> |
| <li><strong>–service</strong>: The node type of the server specified with –address</li> |
| <li><strong>–address</strong>: RPC address for one server</li> |
| <li>Three operations are provided: |
| <ul> |
| <li><strong>start</strong>: Execute the reconfig operation asynchronously</li> |
| <li><strong>status</strong>: Check reconfig status</li> |
| <li><strong>properties</strong>: List reconfigurable properties</li> |
| </ul> |
| </li> |
| </ul> |
| <h2 id="retrieve-the-reconfigurable-properties-list">Retrieve the reconfigurable properties list</h2> |
| <p>To retrieve all the reconfigurable properties list for a specific component in Ozone, |
| you can use the command: <code>ozone admin reconfig --service=[OM|SCM|DATANODE] --address=<ip:port> properties</code>. |
| This command will list all the properties that can be dynamically reconfigured at runtime for specific component.<br></p> |
| <blockquote> |
| <p>For example, get the Ozone OM reconfigurable properties list.</p> |
| <p>$ <code>ozone admin reconfig --service=OM --address=hadoop1:9862 properties</code><br> |
| OM: Node [hadoop1:9862] Reconfigurable properties:<br> |
| ozone.administrators</p> |
| </blockquote> |
| <h2 id="om-reconfigurability">OM Reconfigurability</h2> |
| <blockquote> |
| <p>For example, modify <code>ozone.administrators</code> in ozone-site.xml and execute:</p> |
| <p>$ <code>ozone admin reconfig --service=OM --address=hadoop1:9862 start</code><br> |
| OM: Started OM reconfiguration task on node [hadoop1:9862].</p> |
| <p>$ <code>ozone admin reconfig --service=OM --address=hadoop1:9862 status</code><br> |
| OM: Reconfiguring status for node [hadoop1:9862]: started at Wed Dec 28 19:04:44 CST 2022 and finished at Wed Dec 28 19:04:44 CST 2022.<br> |
| SUCCESS: Changed property ozone.administrators<br> |
| From: “hadoop”<br> |
| To: “hadoop,bigdata”</p> |
| <p>$ <code>ozone admin reconfig --service=OM -address=hadoop1:9862 properties</code><br> |
| OM: Node [hadoop1:9862] Reconfigurable properties:<br> |
| ozone.administrators</p> |
| </blockquote> |
| <h2 id="scm-reconfigurability">SCM Reconfigurability</h2> |
| <blockquote> |
| <p>For example, modify <code>ozone.administrators</code> in ozone-site.xml and execute:</p> |
| <p>$ <code>ozone admin reconfig --service=SCM --address=hadoop1:9860 start</code><br> |
| SCM: Started OM reconfiguration task on node [hadoop1:9860].</p> |
| <p>$ <code>ozone admin reconfig --service=SCM --address=hadoop1:9860 status</code><br> |
| SCM: Reconfiguring status for node [hadoop1:9860]: started at Wed Dec 28 19:04:44 CST 2022 and finished at Wed Dec 28 19:04:44 CST 2022.<br> |
| SUCCESS: Changed property ozone.administrators<br> |
| From: “hadoop”<br> |
| To: “hadoop,bigdata”</p> |
| <p>$ <code>ozone admin reconfig --service=SCM -address=hadoop1:9860 properties</code><br> |
| SCM: Node [hadoop1:9860] Reconfigurable properties:<br> |
| ozone.administrators</p> |
| </blockquote> |
| <h2 id="datanode-reconfigurability">Datanode Reconfigurability</h2> |
| <blockquote> |
| <p>For example, modify <code>ozone.example.config</code> in ozone-site.xml and execute:</p> |
| <p>$ <code>ozone admin reconfig --service=DATANODE --address=hadoop1:19864 start</code><br> |
| Datanode: Started reconfiguration task on node [hadoop1:19864].</p> |
| <p>$ <code>ozone admin reconfig --service=DATANODE --address=hadoop1:19864 status</code><br> |
| Datanode: Reconfiguring status for node [hadoop1:19864]: started at Wed Dec 28 19:04:44 CST 2022 and finished at Wed Dec 28 19:04:44 CST 2022.<br> |
| SUCCESS: Changed property ozone.example.config<br> |
| From: “old”<br> |
| To: “new”</p> |
| <p>$ <code>ozone admin reconfig --service=DATANODE -address=hadoop1:19864 properties</code><br> |
| Datanode: Node [hadoop1:19864] Reconfigurable properties:<br> |
| ozone.example.config</p> |
| </blockquote> |
| <h3 id="batch-operation">Batch operation</h3> |
| <p>If you want to perform a batch operations on the Datanode, you can set the <code>--in-service-datanodes</code> flag. |
| This will send reconfiguration requests to all available DataNodes in the <code>IN_SERVICE</code>operational state.<br> |
| Currently, only Datanode supports batch operations<br></p> |
| <blockquote> |
| <p>For example, to list the reconfigurable properties of all Datanodes:<br> |
| $ <code>ozone admin reconfig --service=DATANODE --in-service-datanodes properties</code><br> |
| Datanode: Node [hadoop1:19864] Reconfigurable properties:<br> |
| ozone.example.config<br> |
| Datanode: Node [hadoop2:19864] Reconfigurable properties:<br> |
| ozone.example.config<br> |
| Datanode: Node [hadoop3:19864] Reconfigurable properties:<br> |
| ozone.example.config<br> |
| Reconfig successfully 3 nodes, failure 0 nodes.<br></p> |
| </blockquote> |
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