[HDFS-1748] Balancer utilization classification is incomplete

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: Federation Branch, 0.23.0
• Component/s: balancer & mover
• Hadoop Flags: Reviewed
• Assignee: Tsz-wo Sze
• Reporter: Tsz-wo Sze
• Created: 10/Mar/11 23:42
• Updated: 15/Nov/11 00:53
• Resolved: 12/Mar/11 01:35

Description

//Balancer.java
  /* Return true if the given datanode is overUtilized */
  private boolean isOverUtilized(BalancerDatanode datanode) {
    return datanode.utilization > (avgUtilization+threshold);
  }
  
  /* Return true if the given datanode is above average utilized
   * but not overUtilized */
  private boolean isAboveAvgUtilized(BalancerDatanode datanode) {
    return (datanode.utilization <= (avgUtilization+threshold))
        && (datanode.utilization > avgUtilization);
  }
  
  /* Return true if the given datanode is underUtilized */
  private boolean isUnderUtilized(BalancerDatanode datanode) {
    return datanode.utilization < (avgUtilization-threshold);
  }

  /* Return true if the given datanode is below average utilized 
   * but not underUtilized */
  private boolean isBelowAvgUtilized(BalancerDatanode datanode) {
        return (datanode.utilization >= (avgUtilization-threshold))
                 && (datanode.utilization < avgUtilization);
  }

Where is datanode.utilization == avgUtilization?