org.apache.hadoop.hdfs.server.datanode

类 BlockMetadataHeader

java.lang.Object

org.apache.hadoop.hdfs.server.datanode.BlockMetadataHeader

@InterfaceAudience.Private
@InterfaceStability.Evolving
public class BlockMetadataHeader
extends Object

BlockMetadataHeader manages metadata for data blocks on Datanodes. This is not related to the Block related functionality in Namenode. The biggest part of data block metadata is CRC for the block.

方法概要

方法

限定符和类型	方法和说明
DataChecksum	getChecksum() Get the version
short	getVersion() Get the version
static BlockMetadataHeader	readHeader(DataInputStream in) This reads all the fields till the beginning of checksum.

从类继承的方法 java.lang.Object

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

方法详细资料

getVersion

public short getVersion()

Get the version

getChecksum

public DataChecksum getChecksum()

Get the version

readHeader

public static BlockMetadataHeader readHeader(DataInputStream in)
                                      throws IOException

This reads all the fields till the beginning of checksum.

参数:

in -

返回:

Metadata Header

抛出:

IOException