alluxio.master.block

Class BlockId

java.lang.Object

alluxio.master.block.BlockId

@ThreadSafe
public final class BlockId
extends Object

This class provides a set of methods related to block IDs. Each block ID is a value of long with the following two parts:

• The most significant 5 bytes (40 bits) represent the container ID of this block and
• The least significant 3 bytes (24 bits) represent the sequence number of this block in the container.

Method Summary

Modifier and Type	Method and Description
static long	createBlockId(long containerId, long sequenceNumber)
static long	getContainerId(long blockId)
static long	getFileId(long blockId)
static long	getMaxSequenceNumber()
static long	getSequenceNumber(long blockId)

Methods inherited from class java.lang.Object

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

Method Detail

createBlockId

public static long createBlockId(long containerId,
                                 long sequenceNumber)

Parameters:

containerId - the container ID to create the block ID with

sequenceNumber - the sequence number to create the block ID with

Returns:

the block ID constructed with the container ID and sequence number

getContainerId

public static long getContainerId(long blockId)

Parameters:

blockId - the block ID to get the container ID for

Returns:

the container ID of a specified block ID

getFileId

public static long getFileId(long blockId)

Parameters:

blockId - the block ID to get the file ID for

Returns:

the file ID of a specified block ID

getSequenceNumber

public static long getSequenceNumber(long blockId)

Parameters:

blockId - the block ID to get the sequence number for

Returns:

the sequence number of the specified block ID

getMaxSequenceNumber

public static long getMaxSequenceNumber()

Returns:

the maximum possible sequence number for block IDs