Package org.apache.hadoop.fs.azurebfs.constants

Enum Class ReadType

java.lang.Object

java.lang.Enum<ReadType>

org.apache.hadoop.fs.azurebfs.constants.ReadType

All Implemented Interfaces:

Serializable, Comparable<ReadType>, Constable

public enum ReadType
extends Enum<ReadType>

Enumeration for different types of read operations triggered by AbfsInputStream.

Nested Class Summary

Nested classes/interfaces inherited from class java.lang.Enum

Enum.EnumDesc<E extends Enum<E>>

Enum Constant Summary

Enum Constants

Enum Constant	Description
DIRECT_READ	Synchronous read from the storage service.
FOOTER_READ	Synchronous read from the storage service for reading the footer of a file.
MISSEDCACHE_READ	Synchronous read from the storage service when nothing was found in cache.
NORMAL_READ	Synchronous read from the storage service where optimization were considered but found disabled.
PREFETCH_READ	Asynchronous read from the storage service for filling up cache.
RANDOM_READ	Reads from Random Input Stream with read ahead up to readAheadRange
SMALLFILE_READ	Synchronous read from the storage service for reading a small file fully.
UNKNOWN_READ	None of the above read types were applicable.

Method Summary

Modifier and Type	Method	Description
String	toString()	Get the read type as a string.
static ReadType	valueOf(String name)	Returns the enum constant of this class with the specified name.
static ReadType[]	values()	Returns an array containing the constants of this enum class, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, describeConstable, equals, finalize, getDeclaringClass, hashCode, name, ordinal, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Details

DIRECT_READ

public static final ReadType DIRECT_READ

Synchronous read from the storage service. No optimization is being applied.

NORMAL_READ

public static final ReadType NORMAL_READ

Synchronous read from the storage service where optimization were considered but found disabled.

PREFETCH_READ

public static final ReadType PREFETCH_READ

Asynchronous read from the storage service for filling up cache.

MISSEDCACHE_READ

public static final ReadType MISSEDCACHE_READ

Synchronous read from the storage service when nothing was found in cache.

FOOTER_READ

public static final ReadType FOOTER_READ

Synchronous read from the storage service for reading the footer of a file. Only triggered when footer read optimization kicks in.

SMALLFILE_READ

public static final ReadType SMALLFILE_READ

Synchronous read from the storage service for reading a small file fully. Only triggered when small file read optimization kicks in.

RANDOM_READ

public static final ReadType RANDOM_READ

Reads from Random Input Stream with read ahead up to readAheadRange

UNKNOWN_READ

public static final ReadType UNKNOWN_READ

None of the above read types were applicable.

Method Details

values

public static ReadType[] values()

Returns an array containing the constants of this enum class, in the order they are declared.

Returns:

an array containing the constants of this enum class, in the order they are declared

valueOf

public static ReadType valueOf(String name)

Returns the enum constant of this class with the specified name. The string must match exactly an identifier used to declare an enum constant in this class. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum class has no constant with the specified name

NullPointerException - if the argument is null

toString

public String toString()

Get the read type as a string.

Overrides:

toString in class Enum<ReadType>

Returns:

the read type string