This ticket is opened to support per disk IO statistics in DataNode based on HDFS-10930. The statistics added will make it easier to implement HDFS-4169 "Add per-disk latency metrics to DataNode".
Add per-disk latency metrics to DataNode
FsVolume should add the operation of creating file's time metrics
Document the missing metrics of DataNode Volume IO operations
The metric of fileIoErrorRate not counted in DataNodeVolumeMetrics