Lei (Eddy) Xu created HDFS-13175:
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             Summary: Add more information for checking argument in 
DiskBalancerVolume
                 Key: HDFS-13175
                 URL: https://issues.apache.org/jira/browse/HDFS-13175
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: diskbalancer
    Affects Versions: 3.0.0
            Reporter: Lei (Eddy) Xu
            Assignee: Lei (Eddy) Xu


We have seen the following stack in production

{code
Exception in thread "main" java.lang.IllegalArgumentException
        at 
com.google.common.base.Preconditions.checkArgument(Preconditions.java:72)
        at 
org.apache.hadoop.hdfs.server.diskbalancer.datamodel.DiskBalancerVolume.setUsed(DiskBalancerVolume.java:268)
        at 
org.apache.hadoop.hdfs.server.diskbalancer.connectors.DBNameNodeConnector.getVolumeInfoFromStorageReports(DBNameNodeConnector.java:141)
        at 
org.apache.hadoop.hdfs.server.diskbalancer.connectors.DBNameNodeConnector.getNodes(DBNameNodeConnector.java:90)
        at 
org.apache.hadoop.hdfs.server.diskbalancer.datamodel.DiskBalancerCluster.readClusterInfo(DiskBalancerCluster.java:132)
        at 
org.apache.hadoop.hdfs.server.diskbalancer.command.Command.readClusterInfo(Command.java:123)
        at 
org.apache.hadoop.hdfs.server.diskbalancer.command.PlanCommand.execute(PlanCommand.java:107)
{code}

raised from 
{code}
 public void setUsed(long dfsUsedSpace) {
    Preconditions.checkArgument(dfsUsedSpace < this.getCapacity());
    this.used = dfsUsedSpace;
  }
{code}

However, the datanode reports at the very moment were not captured. We should 
add more information into the stack trace to better diagnose the issue.



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