commit | 1a9f356c125e2b15b69aa8c7a5f6707fb9ce3e51 | [log] [tgz] |
---|---|---|
author | Denis Vergnes <denis.vergnes@gmail.com> | Wed Jun 30 05:10:47 2021 -0700 |
committer | GitHub <noreply@github.com> | Wed Jun 30 20:10:47 2021 +0800 |
tree | 1edcd1fe9983e627aeb8e960fe761298016a35f5 | |
parent | ea3e0540dbb59596b6e9cf4b6dbced8d5f9b0d11 [diff] |
Add jitter to exponential backoff (#556) (#557) Co-authored-by: Denis Vergnes <dvergnes@users.noreply.github.com> Fixes #556 ### Motivation When reconnecting to a broker, an exponential backoff strategy is used. However, there is no randomness involved which means in case of a general outage impacting several clients, they will try to reconnect at the same time. ### Modifications The modification consists of adding a jitter that adds 20% of delay after the delay is doubled on each retry.
A Go client library for the Apache Pulsar project.
This projects is developing a pure-Go client library for Pulsar that does not depend on the C++ Pulsar library.
Once feature parity and stability are reached, this will supersede the current CGo based library.
Check the Projects page at https://github.com/apache/pulsar-client-go/projects for tracking the status and the progress.
Import the client library:
import "github.com/apache/pulsar-client-go/pulsar"
Create a Producer:
client, err := pulsar.NewClient(pulsar.ClientOptions{
URL: "pulsar://localhost:6650",
})
defer client.Close()
producer, err := client.CreateProducer(pulsar.ProducerOptions{
Topic: "my-topic",
})
_, err = producer.Send(context.Background(), &pulsar.ProducerMessage{
Payload: []byte("hello"),
})
defer producer.Close()
if err != nil {
fmt.Println("Failed to publish message", err)
}
fmt.Println("Published message")
Create a Consumer:
client, err := pulsar.NewClient(pulsar.ClientOptions{
URL: "pulsar://localhost:6650",
})
defer client.Close()
consumer, err := client.Subscribe(pulsar.ConsumerOptions{
Topic: "my-topic",
SubscriptionName: "my-sub",
Type: pulsar.Shared,
})
defer consumer.Close()
msg, err := consumer.Receive(context.Background())
if err != nil {
log.Fatal(err)
}
fmt.Printf("Received message msgId: %#v -- content: '%s'\n",
msg.ID(), string(msg.Payload()))
Create a Reader:
client, err := pulsar.NewClient(pulsar.ClientOptions{URL: "pulsar://localhost:6650"})
if err != nil {
log.Fatal(err)
}
defer client.Close()
reader, err := client.CreateReader(pulsar.ReaderOptions{
Topic: "topic-1",
StartMessageID: pulsar.EarliestMessageID(),
})
if err != nil {
log.Fatal(err)
}
defer reader.Close()
for reader.HasNext() {
msg, err := reader.Next(context.Background())
if err != nil {
log.Fatal(err)
}
fmt.Printf("Received message msgId: %#v -- content: '%s'\n",
msg.ID(), string(msg.Payload()))
}
Contributions are welcomed and greatly appreciated. See CONTRIBUTING.md for details on submitting patches and the contribution workflow.
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Licensed under the Apache License, Version 2.0: http://www.apache.org/licenses/LICENSE-2.0