January 2018
Beginner to intermediate
234 pages
7h 8m
Chinese
Content preview from Kafka权威指南
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158
｜
第
9
章
(1)
发起重分配请求（创建
Zookeeper
节点）。
(2)
集群控制器将分区添加到
broker
上。
(3)
新的
broker
开始复制分区，直到副本达到同步状态。
(4)
集群控制器从分区副本清单里移除旧的
broker
。
因为分区重分配是并行进行的，所以一般情况下没有理由取消一个正在进行中的重分配
任务。不过有一个例外的情况，比如在重分配进行到一半时，
broker
发生了故障并且无
法立即重启，这会导致重分配过程无法结束，进而妨碍其他重分配任务的进行（比如将
故障
broker
的分区分配给其他
broker
）。如果发生了这种情况，可以让集群忽略这个重分
配任务。
移除一个进行中的分区重分配任务的步骤如下。
(1)
从
Zookeeper
上删除 /admin/reassign_partitions 节点。
(2)
重新选举控制器（参见
9.7.1
节 ）。
检查复制系数
在取消进行中的分区重分配任务时，对于任何一个未完成重分配的分区来
说，旧的
broker
都不会从副本清单里移除。也就是说，有些分区的复制系数
会比正常的大。如果主题的分区包含不一致的复制系数，那么
broker
是不允
许对其进行操作的（比如增加分区）。所以建议检查分区是否仍然可用，并
确保分区的复制系数是正确的。
9.7.3
移除待删除的主题
在使用命令行工具删除主题时，命令行工具会在
Zookeeper
上创建一个节点作为删除主题
的请求。在正常情况下，集群会立即执行这个请求。不过，命令行工具并不知道集群是否
启用了主题删除功能。因此，如果集群没有启用主题删除功能 ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.