org.apache.hadoop.hbase.replication

Interface ReplicationEndpoint

All Superinterfaces:

ReplicationPeerConfigListener

All Known Implementing Classes:

BaseReplicationEndpoint, HBaseInterClusterReplicationEndpoint, HBaseReplicationEndpoint, RegionReplicaReplicationEndpoint, VisibilityReplicationEndpoint

@InterfaceAudience.LimitedPrivate(value="Replication")
public interface ReplicationEndpoint
extends ReplicationPeerConfigListener

ReplicationEndpoint is a plugin which implements replication to other HBase clusters, or other systems. ReplicationEndpoint implementation can be specified at the peer creation time by specifying it in the ReplicationPeerConfig. A ReplicationEndpoint is run in a thread in each region server in the same process.

ReplicationEndpoint is closely tied to ReplicationSource in a producer-consumer relation. ReplicationSource is an HBase-private class which tails the logs and manages the queue of logs plus management and persistence of all the state for replication. ReplicationEndpoint on the other hand is responsible for doing the actual shipping and persisting of the WAL entries in the other cluster.

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	ReplicationEndpoint.Context
static class	ReplicationEndpoint.ReplicateContext A context for replicate(ReplicateContext) method.

Method Summary

Modifier and Type	Method and Description
void	awaitRunning() Waits for the ReplicationEndpoint to be up and running.
void	awaitRunning(long timeout, TimeUnit unit) Waits for the ReplicationEndpoint to to be up and running for no more than the given time.
void	awaitTerminated() Waits for the ReplicationEndpoint to reach the terminated (internal) state.
void	awaitTerminated(long timeout, TimeUnit unit) Waits for the ReplicationEndpoint to reach a terminal state for no more than the given time.
boolean	canReplicateToSameCluster() Whether or not, the replication endpoint can replicate to it's source cluster with the same UUID
Throwable	failureCause() Returns the Throwable that caused this service to fail.
UUID	getPeerUUID() Returns a UUID of the provided peer id.
WALEntryFilter	getWALEntryfilter() Returns a WALEntryFilter to use for filtering out WALEntries from the log.
void	init(ReplicationEndpoint.Context context) Initialize the replication endpoint with the given context.
boolean	isRunning() Returns true if this service is RUNNING.
boolean	isStarting()
boolean	replicate(ReplicationEndpoint.ReplicateContext replicateContext) Replicate the given set of entries (in the context) to the other cluster.
void	start() Initiates service startup and returns immediately.
void	stop() If the service is starting or running, this initiates service shutdown and returns immediately.

Methods inherited from interface org.apache.hadoop.hbase.replication.ReplicationPeerConfigListener

peerConfigUpdated

Method Detail

init

void init(ReplicationEndpoint.Context context)
   throws IOException

Initialize the replication endpoint with the given context.

Parameters:

context - replication context

Throws:

IOException

canReplicateToSameCluster

boolean canReplicateToSameCluster()

Whether or not, the replication endpoint can replicate to it's source cluster with the same UUID

getPeerUUID

UUID getPeerUUID()

Returns a UUID of the provided peer id. Every HBase cluster instance has a persisted associated UUID. If the replication is not performed to an actual HBase cluster (but some other system), the UUID returned has to uniquely identify the connected target system.

Returns:

a UUID or null if the peer cluster does not exist or is not connected.

getWALEntryfilter

WALEntryFilter getWALEntryfilter()

Returns a WALEntryFilter to use for filtering out WALEntries from the log. Replication infrastructure will call this filter before sending the edits to shipEdits().

Returns:

a WALEntryFilter or null.

replicate

boolean replicate(ReplicationEndpoint.ReplicateContext replicateContext)

Replicate the given set of entries (in the context) to the other cluster. Can block until all the given entries are replicated. Upon this method is returned, all entries that were passed in the context are assumed to be persisted in the target cluster.

Parameters:

replicateContext - a context where WAL entries and other parameters can be obtained.

isRunning

boolean isRunning()

Returns true if this service is RUNNING.

isStarting

boolean isStarting()

Returns:

Return true is this service is STARTING (but not yet RUNNING).

start

void start()

Initiates service startup and returns immediately. A stopped service may not be restarted. Equivalent of startAsync call in Guava Service.

Throws:

IllegalStateException - if the service is not new, if it has been run already.

awaitRunning

void awaitRunning()

Waits for the ReplicationEndpoint to be up and running.

Throws:

IllegalStateException - if the service reaches a state from which it is not possible to enter the (internal) running state. e.g. if the state is terminated when this method is called then this will throw an IllegalStateException.

awaitRunning

void awaitRunning(long timeout,
                  TimeUnit unit)
           throws TimeoutException

Waits for the ReplicationEndpoint to to be up and running for no more than the given time.

Parameters:

timeout - the maximum time to wait

unit - the time unit of the timeout argument

Throws:

TimeoutException - if the service has not reached the given state within the deadline

IllegalStateException - if the service reaches a state from which it is not possible to enter the (internal) running state. e.g. if the state is terminated when this method is called then this will throw an IllegalStateException.

stop

void stop()

If the service is starting or running, this initiates service shutdown and returns immediately. If the service has already been stopped, this method returns immediately without taking action. Equivalent of stopAsync call in Guava Service.

awaitTerminated

void awaitTerminated()

Waits for the ReplicationEndpoint to reach the terminated (internal) state.

Throws:

IllegalStateException - if the service FAILED.

awaitTerminated

void awaitTerminated(long timeout,
                     TimeUnit unit)
              throws TimeoutException

Waits for the ReplicationEndpoint to reach a terminal state for no more than the given time.

Parameters:

timeout - the maximum time to wait

unit - the time unit of the timeout argument

Throws:

TimeoutException - if the service has not reached the given state within the deadline

IllegalStateException - if the service FAILED.

failureCause

Throwable failureCause()

Returns the Throwable that caused this service to fail.

Throws:

IllegalStateException - if this service's state isn't FAILED.