org.apache.hadoop.contrib.index.mapred

类 Shard

java.lang.Object

org.apache.hadoop.contrib.index.mapred.Shard

所有已实现的接口:

Comparable, Writable, WritableComparable

public class Shard
extends Object
implements WritableComparable

This class represents the metadata of a shard. Version is the version number of the entire index. Directory is the directory where this shard resides in. Generation is the Lucene index's generation. Version and generation are reserved for future use. Note: Currently the version number of the entire index is not used and defaults to -1.

构造器概要

构造器

构造器和说明
Shard() Constructor.
Shard(long version, String dir, long gen) Construct a shard from a versio number, a directory and a generation number.
Shard(Shard shard) Construct using a shard object.

方法概要

方法

限定符和类型	方法和说明
int	compareTo(Object o)
int	compareTo(Shard other) Compare to another shard.
boolean	equals(Object o)
String	getDirectory() Get the directory where this shard resides.
long	getGeneration() Get the generation of the Lucene instance.
static Shard[]	getIndexShards(IndexUpdateConfiguration conf)
long	getVersion() Get the version number of the entire index.
int	hashCode()
static String	normalizePath(String path)
void	readFields(DataInput in) Deserialize the fields of this object from in.
static void	setIndexShards(IndexUpdateConfiguration conf, Shard[] shards)
String	toString()
void	write(DataOutput out) Serialize the fields of this object to out.

从类继承的方法 java.lang.Object

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

构造器详细资料

Shard

public Shard()

Constructor.

Shard

public Shard(long version,
     String dir,
     long gen)

Construct a shard from a versio number, a directory and a generation number.

参数:

version - the version number of the entire index

dir - the directory where this shard resides

gen - the generation of the Lucene instance

Shard

public Shard(Shard shard)

Construct using a shard object.

参数:

shard - the shard used by the constructor

方法详细资料

normalizePath

public static String normalizePath(String path)

setIndexShards

public static void setIndexShards(IndexUpdateConfiguration conf,
                  Shard[] shards)

getIndexShards

public static Shard[] getIndexShards(IndexUpdateConfiguration conf)

getVersion

public long getVersion()

Get the version number of the entire index.

返回:

the version number of the entire index

getDirectory

public String getDirectory()

Get the directory where this shard resides.

返回:

the directory where this shard resides

getGeneration

public long getGeneration()

Get the generation of the Lucene instance.

返回:

the generation of the Lucene instance

toString

public String toString()

覆盖:

toString 在类中 Object

write

public void write(DataOutput out)
           throws IOException

从接口复制的说明: Writable

Serialize the fields of this object to out.

指定者:

write 在接口中 Writable

参数:

out - DataOuput to serialize this object into.

抛出:

IOException

readFields

public void readFields(DataInput in)
                throws IOException

从接口复制的说明: Writable

Deserialize the fields of this object from in.

For efficiency, implementations should attempt to re-use storage in the existing object where possible.

指定者:

readFields 在接口中 Writable

参数:

in - DataInput to deseriablize this object from.

抛出:

IOException

compareTo

public int compareTo(Object o)

指定者:

compareTo 在接口中 Comparable

compareTo

public int compareTo(Shard other)

Compare to another shard.

参数:

other - another shard

返回:

compare version first, then directory and finally generation

equals

public boolean equals(Object o)

覆盖:

equals 在类中 Object

hashCode

public int hashCode()

覆盖:

hashCode 在类中 Object