Package org.apache.hadoop.hdfs.server.diskbalancer.planner

package org.apache.hadoop.hdfs.server.diskbalancer.planner
Planner takes a DiskBalancerVolumeSet, threshold and computes a series of steps that lead to an even data distribution between volumes of this DiskBalancerVolumeSet. The main classes of this package are steps and planner. Here is a high level view of how planner operates: DiskBalancerVolumeSet current = volumeSet; while(current.isBalancingNeeded(thresholdValue)) { // Creates a plan , like move 20 GB data from v1 -> v2 Step step = planner.plan(current, thresholdValue); // we add that to our plan planner.addStep(current, step); // Apply the step to current state of the diskSet to //compute the next state current = planner.apply(current, step); } //when we are done , return the list of steps return planner;
  • Class
    Description
    org.apache.hadoop.hdfs.server.diskbalancer.planner.GreedyPlanner
    Greedy Planner is a simple planner that computes the largest possible move at any point of time given a volumeSet.
    org.apache.hadoop.hdfs.server.diskbalancer.planner.MoveStep
    Ignore fields with default values.
    org.apache.hadoop.hdfs.server.diskbalancer.planner.NodePlan
    NodePlan is a set of volumeSetPlans.
    org.apache.hadoop.hdfs.server.diskbalancer.planner.Planner
    Planner interface allows different planners to be created.
    org.apache.hadoop.hdfs.server.diskbalancer.planner.PlannerFactory
    Returns a planner based on the user defined tags.
    org.apache.hadoop.hdfs.server.diskbalancer.planner.Step
    A step in the plan.