Package org.apache.hadoop.hdfs.server.protocol

@LimitedPrivate("HDFS") @Evolving package org.apache.hadoop.hdfs.server.protocol

Package contains classes that allows HDFS to communicate information b/w DataNode and NameNode.

Class	Description
DatanodeStorage	Class captures information of a storage in Datanode.
DatanodeStorage.State	The state of the storage.
DatanodeStorageReport	Class captures information of a datanode and its storages.
DataNodeUsageReport	A class that allows DataNode to communicate information about usage statistics/metrics to NameNode.
DataNodeUsageReport.Builder	Builder class for DataNodeUsageReport.
DataNodeUsageReportUtil	This class is helper class to generate a live usage report by calculating the delta between current DataNode usage metrics and the usage metrics captured at the time of the last report.
OutlierMetrics	Outlier detection metrics - median, median absolute deviation, upper latency limit, actual latency etc.
SlowDiskReports	A class that allows a DataNode to communicate information about all its disks that appear to be slow.
SlowDiskReports.DiskOp	Lists the types of operations on which disk latencies are measured.
SlowPeerReports	A class that allows a DataNode to communicate information about all its peer DataNodes that appear to be slow.
StorageReport	Utilization report for a Datanode storage