bManager&rsquo;s main thread;</li>
<li>The JobManager serializes TaskDeploymentDescriptors asynchronously;</li>
<li>The JobManager ships serialized TaskDeploymentDescriptors to TaskManagers via RPC messages;</li>
<li>TaskManagers create new tasks based on the TaskDeploymentDescriptors and execute them.</li>
</ol>
<p>A TaskDeploymentDescriptor (TDD) contains all the information required by TaskManagers to create a task. At the beginning of task deployment, a JobManager creates the TDDs for all tasks. Since t