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| <h1 class="page-title">IConfigLoader</h1> |
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| <div class="documentation-content"><h3 id="introduction">Introduction</h3> |
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| <p>IConfigLoader is an interface designed to allow dynamic loading of scheduler resource constraints. Currently, the MultiTenant scheduler uses this interface to dynamically load the number of isolated nodes a given user has been guaranteed, and the ResoureAwareScheduler uses the interface to dynamically load per user resource guarantees.</p> |
| |
| <p>The following interface is provided for users to create an IConfigLoader instance based on the scheme of the <code>scheduler.config.loader.uri</code>. |
| <code> |
| ConfigLoaderFactoryService.createConfigLoader(Map<String, Object> conf) |
| </code> </p> |
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| <hr> |
| |
| <h3 id="interface">Interface</h3> |
| <div class="highlight"><pre><code class="language-" data-lang="">public interface IConfigLoader { |
| Map<?,?> load(); |
| }; |
| </code></pre></div> |
| <h4 id="description">Description</h4> |
| |
| <ul> |
| <li>load is called by the scheduler whenever it wishes to retrieve the most recent configuration map.</li> |
| </ul> |
| |
| <h4 id="loader-configuration">Loader Configuration</h4> |
| |
| <p>The loaders are dynamically selected and dynamically configured through configuration items in the scheduler implementations.</p> |
| |
| <h5 id="example">Example</h5> |
| <div class="highlight"><pre><code class="language-" data-lang="">scheduler.config.loader.uri: "artifactory+http://artifactory.my.company.com:8000/artifactory/configurations/clusters/my_cluster/ras_pools" |
| scheduler.config.loader.timeout.sec: 30 |
| </code></pre></div> |
| <p>Or |
| <code> |
| scheduler.config.loader.uri: "file:///path/to/my/config.yaml" |
| </code></p> |
| |
| <h3 id="implementations">Implementations</h3> |
| |
| <p>There are currently two implemenations of IConfigLoader |
| - org.apache.storm.scheduler.utils.ArtifactoryConfigLoader: Load configurations from an Artifactory server. |
| It will be used if users add <code>artifactory+</code> to the scheme of the real URI and set to <code>scheduler.config.loader.uri</code>. |
| - org.apache.storm.scheduler.utils.FileConfigLoader: Load configurations from a local file. It will be used if users use <code>file</code> scheme.</p> |
| |
| <h4 id="configurations">Configurations</h4> |
| |
| <ul> |
| <li>scheduler.config.loader.uri: For <code>ArtifactoryConfigLoader</code>, this can either be a reference to an individual file in Artifactory or to a directory. If it is a directory, the file with the largest lexographic name will be returned. |
| For <code>FileConfigLoader</code>, this is the URI pointing to a file.</li> |
| <li>scheduler.config.loader.timeout.secs: Currently only used in <code>ArtifactoryConfigLoader</code>. It is the amount of time an http connection to the artifactory server will wait before timing out. The default is 10.</li> |
| <li>scheduler.config.loader.polltime.secs: Currently only used in <code>ArtifactoryConfigLoader</code>. It is the frequency at which the plugin will call out to artifactory instead of returning the most recently cached result. The default is 600 seconds.</li> |
| <li>scheduler.config.loader.artifactory.base.directory: Only used in <code>ArtifactoryConfigLoader</code>. It is the part of the uri, configurable in Artifactory, which represents the top of the directory tree. It defaults to "/artifactory".</li> |
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