org.apache.hadoop.hbase.regionserver

Class BootstrapNodeManager

java.lang.Object

org.apache.hadoop.hbase.regionserver.BootstrapNodeManager

@InterfaceAudience.Private
public class BootstrapNodeManager
extends Object

Manage the bootstrap node list at region server side.

It will request master first to get the initial set of bootstrap nodes(a sub set of live region servers), and then it will exchange the bootstrap nodes with other bootstrap nodes. In most cases, if the cluster is stable, we do not need to request master again until we reach the request master interval. And if the current number of bootstrap nodes is not enough, we will request master soon.

The algorithm is very simple, as we will always fallback to request master. THe trick here is that, if we can not get enough bootstrap nodes from master, then the cluster will be small, so it will not put too much pressure on master if we always request master. And for large clusters, we will soon get enough bootstrap nodes and stop requesting master.

Field Summary

Fields

Modifier and Type	Field and Description
static long	DEFAULT_REQUEST_MASTER_INTERVAL_SECS
static long	DEFAULT_REQUEST_MASTER_MIN_INTERVAL_SECS
static long	DEFAULT_REQUEST_REGIONSERVER_INTERVAL_SECS
static String	REQUEST_MASTER_INTERVAL_SECS
static String	REQUEST_MASTER_MIN_INTERVAL_SECS
static String	REQUEST_REGIONSERVER_INTERVAL_SECS

Constructor Summary

Constructors

Constructor and Description
BootstrapNodeManager(ClusterConnection conn, MasterAddressTracker masterAddrTracker)

Method Summary

Modifier and Type	Method and Description
List<ServerName>	getBootstrapNodes()
void	stop()

Methods inherited from class java.lang.Object

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

Field Detail

REQUEST_MASTER_INTERVAL_SECS

public static final String REQUEST_MASTER_INTERVAL_SECS

See Also:

Constant Field Values

DEFAULT_REQUEST_MASTER_INTERVAL_SECS

public static final long DEFAULT_REQUEST_MASTER_INTERVAL_SECS

REQUEST_MASTER_MIN_INTERVAL_SECS

public static final String REQUEST_MASTER_MIN_INTERVAL_SECS

See Also:

Constant Field Values

DEFAULT_REQUEST_MASTER_MIN_INTERVAL_SECS

public static final long DEFAULT_REQUEST_MASTER_MIN_INTERVAL_SECS

See Also:

Constant Field Values

REQUEST_REGIONSERVER_INTERVAL_SECS

public static final String REQUEST_REGIONSERVER_INTERVAL_SECS

See Also:

Constant Field Values

DEFAULT_REQUEST_REGIONSERVER_INTERVAL_SECS

public static final long DEFAULT_REQUEST_REGIONSERVER_INTERVAL_SECS

See Also:

Constant Field Values

Constructor Detail

BootstrapNodeManager

public BootstrapNodeManager(ClusterConnection conn,
                            MasterAddressTracker masterAddrTracker)

Method Detail

stop

public void stop()

getBootstrapNodes

public List<ServerName> getBootstrapNodes()