Package org.apache.pulsar.functions.worker

Class FunctionAssignmentTailer

  • All Implemented Interfaces:
    java.lang.AutoCloseable
    public class FunctionAssignmentTailer
extends java.lang.Object
implements java.lang.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.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void close()  
      void start()  
      void startFromMessage​(org.apache.pulsar.client.api.MessageId startMessageId)  
      java.util.concurrent.CompletableFuture<java.lang.Void> triggerReadToTheEndAndExit()  

      • Methods inherited from class java.lang.Object

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

    • Constructor Detail

      • FunctionAssignmentTailer

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

    • Method Detail

      • triggerReadToTheEndAndExit

        public java.util.concurrent.CompletableFuture<java.lang.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 java.lang.AutoCloseable