org.apache.hadoop.hdfs.server.datanode

Class DatanodeUtil

java.lang.Object

org.apache.hadoop.hdfs.server.datanode.DatanodeUtil

@InterfaceAudience.Private
public class DatanodeUtil
extends Object

Provide utility methods for Datanode.

Field Summary

Fields

Modifier and Type	Field and Description
static String	DISK_ERROR
static String	UNLINK_BLOCK_SUFFIX

Constructor Summary

Constructors

Constructor and Description
DatanodeUtil()

Method Summary

Methods

Modifier and Type	Method and Description
static File	createTmpFile(Block b, File f) Create a new file.
static String	getMetaName(String blockName, long generationStamp)
static File	getUnlinkTmpFile(File f)

Methods inherited from class java.lang.Object

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

Field Detail

UNLINK_BLOCK_SUFFIX

public static final String UNLINK_BLOCK_SUFFIX

See Also:

Constant Field Values

DISK_ERROR

public static final String DISK_ERROR

See Also:

Constant Field Values

Constructor Detail

DatanodeUtil

public DatanodeUtil()

Method Detail

createTmpFile

public static File createTmpFile(Block b,
                 File f)
                          throws IOException

Create a new file.

Throws:

IOException - if the file already exists or if the file cannot be created.

getMetaName

public static String getMetaName(String blockName,
                 long generationStamp)

Returns:

the meta name given the block name and generation stamp.

getUnlinkTmpFile

public static File getUnlinkTmpFile(File f)

Returns:

the unlink file.