前言
针对 Knative Eventing v0.13.0 版本对这些新功能特性进行解读，让你快速对 v0.13.0 版本有所了解。
新特性
v1beta1 版本
从 v0.13.0 开始引入了 v1beta1 版本，包括如下资源： Broker, Trigger, Channel, Subscription, Sequence, Parallel, EventType, InMemoryChannel
支持通过configmap配置event dispatch 策略
之前通过event dispatch 转发事件时，默认超时时间是1分钟，并且是默认设置不能配置，显然在某些长时间请求的情况下1分钟不够。在v0.13.版本中，支持通过configmap配置相关的策略，包括超时时间，MaxIdleConns等
新增 PingSource 资源
其实是将原来的 CronJobSource 改名了，以与k8s 中的CronJob进行区分。
in-mem channel 事件分发作用范围
in-mem channel 支持通过 eventing.knative.dev/scope: namespace 注释来判断 In-memory dispatcher 是否部署在相同的命名空间中
HA支持
Knative 从0.13.0版本开始对核心的controller提供 HA 支持（包括Serving），Knative Eventing 中可以通过 config-leader-election configmap进行配置。
kind: ConfigMap
metadata:
name: config-leader-election
namespace: knative-eventing
labels:
eventing.knative.dev/release: "v0.13.0"
data:
# An inactive but valid configuration follows; see example.
resourceLock: "leases"
leaseDuration: "15s"
renewDeadline: "10s"
retryPeriod: "2s"
_example: |
################################
# #
# EXAMPLE CONFIGURATION #
# #
################################
# This block is not actually functional configuration,
# but serves to illustrate the available configuration
# options and document them in a way that is accessible
# to users that `kubectl edit` this config map.
#
# These sample configuration options may be copied out of
# this example block and unindented to be in the data block
# to actually change the configuration.
# resourceLock controls which API resource is used as the basis for the
# leader election lock. Valid values are:
#
# - leases -> use the coordination API
# - configmaps -> use configmaps
# - endpoints -> use endpoints
resourceLock: "leases"
# leaseDuration is how long non-leaders will wait to try to acquire the
# lock; 15 seconds is the value used by core kubernetes controllers.
leaseDuration: "15s"
# renewDeadline is how long a leader will try to renew the lease before
# giving up; 10 seconds is the value used by core kubernetes controllers.
renewDeadline: "10s"
# retryPeriod is how long the leader election client waits between tries of
# actions; 2 seconds is the value used by core kuberntes controllers.
retryPeriod: "2s"
# enabledComponents is a comma-delimited list of component names for which
# leader election is enabled. Valid values are:
#
# - controller
# - broker-controller
# - inmemorychannel-dispatcher
# - inmemorychannel-controller
enabledComponents: "controller"其它关键信息
- 设置 Broker Filter/Ingress pods 默认 Prometheus Port： 9092
- 在Broker中支持通过configmap 配置 Channel
总结
个人认为本次 Knative Eventing v0.13.0 版本最大的惊喜是支持了组件的 HA 部署，极大的提高了生产可用性。相信接下来社区会继续完善可用性方面的功能。欢迎对 Knative 有兴趣的一起交流。
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