Yiqun Lin created HDFS-11281:
--------------------------------

             Summary: The metric of fileIoErrorRate not counted in 
DataNodeVolumeMetrics
                 Key: HDFS-11281
                 URL: https://issues.apache.org/jira/browse/HDFS-11281
             Project: Hadoop HDFS
          Issue Type: Bug
    Affects Versions: 3.0.0-alpha2
            Reporter: Yiqun Lin
            Assignee: Yiqun Lin
            Priority: Minor


The metric of fileIoErrorRate not counted in {{DataNodeVolumeMetrics}}. The 
relevant codes:
{code}
  public void addFileIoError(final long latency) {
    totalFileIoErrors.incr();
    metadataOperationRate.add(latency);
  }
{code}
Here the metric {{metadataOperationRate}} should be {{fileIoErrorRate}}. Two 
reasons: 1.metadataOperationRate has been counted in 
{{addMetadastaOperationLatency}}. 2.{{fileIoErrorRate}} is never counted in the 
class {{DataNodeVolumeMetrics}}.



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