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    // Register TaskFactory with this storageNode's helixManager 
    HelixManager helixManager = _clusterManagerAdmin.getClusterManager(); 
    StateMachineEngine stateMachine = helixManager.getStateMachineEngine(); 
    _helixTaskFactory = new TaskStateModelFactory(helixManager, taskFactoryMap); 
    stateMachine.registerStateModelFactory("Task", _helixTaskFactory);

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public class BackupTask implements Task { 
 String _partition; 
 BackupTask(String partition) { 
   _partition = partition 
 }  
 @Override 
 TaskResult run() { 
   backup(_partition); 
 } 
}

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public class BackupTaskFactory implements TaskFactory { 
 /** 
  * Returns a {@link Task} instance. 
  * @param context Contextual information for the task, including task and job configurations 
  * @return A {@link Task} instance. 
  */ 
 Task createNewTask(TaskCallbackContext context) { 
   String targetPartition = taskContext.getTaskConfig().getTargetPartition(); 
   return new BackupTask(partition); 
 } 

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Studying for a Tech Interview Sucks, so Here's a Cheat Sheet to Help

This list is meant to be a both a quick guide and reference for further research into these topics. It's basically a summary of that comp sci course you never took or forgot about, so there's no way it can cover everything in depth. It also will be available as a gist on Github for everyone to edit and add to.

Data Structure Basics

###Array ####Definition:

• Stores data elements based on an sequential, most commonly 0 based, index.
• Based on tuples from set theory.