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

Class SlowDiskReports

java.lang.Object

org.apache.hadoop.hdfs.server.protocol.SlowDiskReports

@Private
@Unstable
public final class SlowDiskReports
extends Object

A class that allows a DataNode to communicate information about all its disks that appear to be slow. The wire representation of this structure is a list of SlowDiskReportProto messages.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	SlowDiskReports.DiskOp	Lists the types of operations on which disk latencies are measured.

Field Summary

Fields

Modifier and Type	Field	Description
static final SlowDiskReports	EMPTY_REPORT	An object representing a SlowDiskReports with no entries.

Method Summary

Modifier and Type	Method	Description
static SlowDiskReports	create(Map<String,Map<SlowDiskReports.DiskOp,Double>> slowDisks)
boolean	equals(Object o)	Return true if the two objects represent the same set slow disk entries.
Map<String,Map<SlowDiskReports.DiskOp,Double>>	getSlowDisks()
int	hashCode()
boolean	haveSlowDisks()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Field Details

EMPTY_REPORT

public static final SlowDiskReports EMPTY_REPORT

An object representing a SlowDiskReports with no entries. Should be used instead of null or creating new objects when there are no slow peers to report.

Method Details

create

public static SlowDiskReports create(@Nullable
 Map<String,Map<SlowDiskReports.DiskOp,Double>> slowDisks)

getSlowDisks

public Map<String,Map<SlowDiskReports.DiskOp,Double>> getSlowDisks()

haveSlowDisks

public boolean haveSlowDisks()

equals

public boolean equals(Object o)

Return true if the two objects represent the same set slow disk entries. Primarily for unit testing convenience.

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object