org.apache.hadoop.hdfs.server.protocol
Class BalancerBandwidthCommand

java.lang.Object
  org.apache.hadoop.hdfs.server.protocol.ServerCommand
      org.apache.hadoop.hdfs.server.protocol.DatanodeCommand
          org.apache.hadoop.hdfs.server.protocol.BalancerBandwidthCommand

All Implemented Interfaces:

org.apache.hadoop.io.Writable

public class BalancerBandwidthCommand
extends org.apache.hadoop.hdfs.server.protocol.DatanodeCommand

Balancer bandwidth command instructs each datanode to change its value for the max amount of network bandwidth it may use during the block balancing operation. The Balancer Bandwidth Command contains the new bandwidth value as its payload. The bandwidth value is in bytes per second.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.hdfs.server.protocol.DatanodeCommand

DatanodeCommand.Finalize

Field Summary

Fields inherited from class org.apache.hadoop.hdfs.server.protocol.DatanodeCommand

REGISTER

Constructor Summary

BalancerBandwidthCommand(long bandwidth)
Balancer Bandwidth Command constructor.

Method Summary

long	getBalancerBandwidthValue() Get current value of the max balancer bandwidth in bytes per second.
void	readFields(DataInput in) Reads the bandwidth payload from the Balancer Bandwidth Command packet.
void	write(DataOutput out) Writes the bandwidth payload to the Balancer Bandwidth Command packet.

Methods inherited from class org.apache.hadoop.hdfs.server.protocol.ServerCommand

getAction

Methods inherited from class java.lang.Object

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

Constructor Detail

BalancerBandwidthCommand

public BalancerBandwidthCommand(long bandwidth)

Balancer Bandwidth Command constructor.

Parameters:

bandwidth - Blanacer bandwidth in bytes per second.

Method Detail

getBalancerBandwidthValue

public long getBalancerBandwidthValue()

Get current value of the max balancer bandwidth in bytes per second.

Returns:

bandwidth Blanacer bandwidth in bytes per second for this datanode.

write

public void write(DataOutput out)
           throws IOException

Writes the bandwidth payload to the Balancer Bandwidth Command packet.

Specified by:

write in interface org.apache.hadoop.io.Writable

Overrides:

write in class org.apache.hadoop.hdfs.server.protocol.ServerCommand

Parameters:

out - DataOutput stream used for writing commands to the datanode.

Throws:

IOException

readFields

public void readFields(DataInput in)
                throws IOException

Reads the bandwidth payload from the Balancer Bandwidth Command packet.

Specified by:

readFields in interface org.apache.hadoop.io.Writable

Overrides:

readFields in class org.apache.hadoop.hdfs.server.protocol.ServerCommand

Parameters:

in - DataInput stream used for reading commands to the datanode.

Throws:

IOException