org.apache.hadoop.hbase.master

类 ClusterStatusPublisher

java.lang.Object

org.apache.hadoop.hbase.ScheduledChore

org.apache.hadoop.hbase.master.ClusterStatusPublisher

所有已实现的接口:

Runnable

@InterfaceAudience.Private
public class ClusterStatusPublisher
extends ScheduledChore

Class to publish the cluster status to the client. This allows them to know immediately the dead region servers, hence to cut the connection they have with them, eventually stop waiting on the socket. This improves the mean time to recover, and as well allows to increase on the client the different timeouts, as the dead servers will be detected separately.

嵌套类概要

嵌套类

限定符和类型	类和说明
static class	ClusterStatusPublisher.MulticastPublisher
static interface	ClusterStatusPublisher.Publisher

字段概要

字段

限定符和类型	字段和说明
static int	DEFAULT_STATUS_PUBLISH_PERIOD
static Class<? extends ClusterStatusPublisher.Publisher>	DEFAULT_STATUS_PUBLISHER_CLASS
static int	MAX_SERVER_PER_MESSAGE We want to limit the size of the protobuf message sent, do fit into a single packet.
static int	NB_SEND If a server dies, we're sending the information multiple times in case a receiver misses the message.
static String	STATUS_PUBLISH_PERIOD The minimum time between two status messages, in milliseconds.
static String	STATUS_PUBLISHER_CLASS The implementation class used to publish the status.

构造器概要

构造器

限定符	构造器和说明
protected	ClusterStatusPublisher()
	ClusterStatusPublisher(HMaster master, org.apache.hadoop.conf.Configuration conf, Class<? extends ClusterStatusPublisher.Publisher> publisherClass)

方法概要

限定符和类型	方法和说明
protected void	chore()
protected void	cleanup()
protected List<ServerName>	generateDeadServersListToSend() Create the dead server to send.
protected List<Pair<ServerName,Long>>	getDeadServers(long since) Get the servers which died since a given timestamp.

从类继承的方法 org.apache.hadoop.hbase.ScheduledChore

cancel, cancel, choreForTesting, getInitialDelay, getName, getPeriod, getStopper, getTimeUnit, initialChore, isInitialChoreComplete, isScheduled, run, toString, triggerNow

从类继承的方法 java.lang.Object

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

字段详细资料

STATUS_PUBLISHER_CLASS

public static final String STATUS_PUBLISHER_CLASS

The implementation class used to publish the status. Default is null (no publish). Use org.apache.hadoop.hbase.master.ClusterStatusPublisher.MulticastPublisher to multicast the status.

另请参阅:

常量字段值

DEFAULT_STATUS_PUBLISHER_CLASS

public static final Class<? extends ClusterStatusPublisher.Publisher> DEFAULT_STATUS_PUBLISHER_CLASS

STATUS_PUBLISH_PERIOD

public static final String STATUS_PUBLISH_PERIOD

The minimum time between two status messages, in milliseconds.

另请参阅:

常量字段值

DEFAULT_STATUS_PUBLISH_PERIOD

public static final int DEFAULT_STATUS_PUBLISH_PERIOD

另请参阅:

常量字段值

MAX_SERVER_PER_MESSAGE

public static final int MAX_SERVER_PER_MESSAGE

We want to limit the size of the protobuf message sent, do fit into a single packet. a reasonable size for ip / ethernet is less than 1Kb.

另请参阅:

常量字段值

NB_SEND

public static final int NB_SEND

If a server dies, we're sending the information multiple times in case a receiver misses the message.

另请参阅:

常量字段值

构造器详细资料

ClusterStatusPublisher

public ClusterStatusPublisher(HMaster master,
                              org.apache.hadoop.conf.Configuration conf,
                              Class<? extends ClusterStatusPublisher.Publisher> publisherClass)
                       throws IOException

抛出:

IOException

ClusterStatusPublisher

protected ClusterStatusPublisher()

方法详细资料

chore

protected void chore()

指定者:

chore 在类中 ScheduledChore

cleanup

protected void cleanup()

覆盖:

cleanup 在类中 ScheduledChore

generateDeadServersListToSend

protected List<ServerName> generateDeadServersListToSend()

Create the dead server to send. A dead server is sent NB_SEND times. We send at max MAX_SERVER_PER_MESSAGE at a time. if there are too many dead servers, we send the newly dead first.

getDeadServers

protected List<Pair<ServerName,Long>> getDeadServers(long since)

Get the servers which died since a given timestamp. protected because it can be subclassed by the tests.