Package org.apache.pulsar.functions.worker

Class FunctionAssignmentTailer

java.lang.Object

org.apache.pulsar.functions.worker.FunctionAssignmentTailer

All Implemented Interfaces:

AutoCloseable

public class FunctionAssignmentTailer
extends Object
implements AutoCloseable

This class is responsible for reading assignments from the 'assignments' functions internal topic. Only functions worker leader writes to the topic while other workers read from the topic. When a worker become a leader, the worker will read to the end of the assignments topic and close its reader to the topic. Then the worker and new leader will be in charge of computing new assignments when necessary. The leader does not need to listen to the assignments topic because it can just update its in memory assignments map directly after it computes a new scheduling. When a worker loses leadership, the worker is start reading from the assignments topic again.

Constructor Summary

Constructors

Constructor	Description
FunctionAssignmentTailer(FunctionRuntimeManager functionRuntimeManager, org.apache.pulsar.client.api.ReaderBuilder readerBuilder, WorkerConfig workerConfig, ErrorNotifier errorNotifier)

Method Summary

Modifier and Type	Method	Description
void	close()
void	start()
void	startFromMessage(org.apache.pulsar.client.api.MessageId startMessageId)
CompletableFuture<Void>	triggerReadToTheEndAndExit()

Methods inherited from class java.lang.Object

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

Constructor Details

FunctionAssignmentTailer

public FunctionAssignmentTailer(FunctionRuntimeManager functionRuntimeManager,
 org.apache.pulsar.client.api.ReaderBuilder readerBuilder,
 WorkerConfig workerConfig,
 ErrorNotifier errorNotifier)

Method Details

triggerReadToTheEndAndExit

public CompletableFuture<Void> triggerReadToTheEndAndExit()

startFromMessage

public void startFromMessage(org.apache.pulsar.client.api.MessageId startMessageId)
                      throws org.apache.pulsar.client.api.PulsarClientException

Throws:

org.apache.pulsar.client.api.PulsarClientException

start

public void start()
           throws org.apache.pulsar.client.api.PulsarClientException

Throws:

org.apache.pulsar.client.api.PulsarClientException

close

public void close()

Specified by:

close in interface AutoCloseable