January 2018
Beginner to intermediate
234 pages
7h 8m
Chinese
Content preview from Kafka权威指南
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146
｜
第
9
章
9.3.4
移除被覆盖的配置
动态的配置完全可以被移除，从而恢复到集群的默认配置。可以使用 --alter 命令和
--delete-config 参数来删除被覆盖的配置。
示例：删除主题
my-topic
的 retention.ms 覆盖配置。
# kafka-configs.sh --zookeeper zoo1.example.com:2181/kafka-cluster
--alter -- entity-type topics --entity-name my-topic
--delete-config retention.ms
Updated config for topic: "my-topic".
#
9.4
分区管理
Kafka
工具提供了两个脚本用于管理分区，一个用于重新选举首领，另一个用于将分区分
配给
broker
。结合使用这两个工具，就可以实现集群流量的负载均衡。
9.4.1
首选的首领选举
第
6
章提到，使用多个分区副本可以提升可靠性。不过，只有其中的一个副本可以成为
分区首领，而且只有首领所在的
broker
可以进行生产和消费活动。
Kafka
将副本清单里
的第一个同步副本选为首领，但在关闭并重启
broker
之后，并不会自动恢复原先首领的
身份。
自动首领再均衡
broker
有一个配置可以用于启用自动首领再均衡，不过到目前为止，并不建
议在生产环境使用该功能。自动均衡会带来严重的性能问题，在大型的集群
里，它会造成客户端流量的长时间停顿。
通过触发首选的副本选举，可以让
broker ...
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