|NO.Z.00042|——————————|^^ 创建 ^^|——|Hadoop&kafka.V27|——|kafka.v27|主题管理.v02|

一、修改主题

### --- 为topic_x加入segment.bytes配置

[root@hadoop ~]# kafka-topics.sh --zookeeper localhost:2181/myKafka --alter \
--topic topic_x --config segment.bytes=10485760

~~~     # Configs:segment.bytes=10485760：参数已经设置

[root@hadoop ~]# kafka-topics.sh --zookeeper localhost:2181/myKafka --describe --topics-with-overrides
Topic:topic_x   PartitionCount:3    ReplicationFactor:1 Configs:segment.bytes=10485760

### --- 在topic_z下删除message.bytes配置

[root@hadoop ~]# kafka-topics.sh --zookeeper localhost:2181/myKafka --describe --topics-with-overrides
Topic:topic_z   PartitionCount:5    ReplicationFactor:1 Configs:compression.type=gzip,max.message.bytes=512

~~~     # 删除topic_z下message.bytes配置

[root@hadoop ~]# kafka-topics.sh --zookeeper localhost:2181/myKafka --alter --delete-config \
max.message.bytes --topic topic_z

[root@hadoop ~]# kafka-topics.sh --zookeeper localhost:2181/myKafka --describe --topics-with-overrides
Topic:topic_z   PartitionCount:5    ReplicationFactor:1 Configs:compression.type=gzip

二、删除主题

### --- 删除主题

~~~     kafka在v1.0.0之前是不可以删除的，最多标注一下是删除状态
~~~     在kafkaV1.0.0之后是可以删除的
~~~     官方说明：在1.0.0之前技术不是很成熟，不能删除

~~~     # 删除策略

~~~     第一步：在zookeeper下把这个主题删除掉
~~~     第二步：在正真存储数据的地方，把这个分区的文件夹删除掉
~~~     同时这个分区有副本的话，副本也需要删除掉

### --- 删除主题

[zk: localhost:2181(CONNECTED) 1] get /myKafka/config/topics/topic_z
{"version":1,"config":{"compression.type":"gzip"}}
cZxid = 0x51f
ctime = Wed Sep 22 21:37:24 CST 2021
mZxid = 0x558
mtime = Wed Sep 22 21:52:41 CST 2021
pZxid = 0x51f
cversion = 0
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 50
numChildren = 0

~~~     # 删除主题

[root@hadoop ~]# kafka-topics.sh --zookeeper localhost:2181/myKafka --delete --topic topic_z

### --- 给主题添加删除的标记：待会直接删除掉

[root@hadoop ~]# ls /opt/yanqi/servers/kafka/kafka-logs/ | grep topic_z
topic_z-0.29b5cb37fe47476d9b66b4d296b2949b-delete
topic_z-1.abad93ad134644b1882066e03838acbf-delete
topic_z-2.b62f5ea622ff48b4b9b430aba81870a0-delete
topic_z-3.ff350278c0eb4a758e12bb79ccc3b059-delete
topic_z-4.72303fbddcce430ebfa680d881634508-delete

### --- zokkeeper下数据已经被删除掉

[zk: localhost:2181(CONNECTED) 3] ls /myKafka/config/topics
[topic_x, topic_y]

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Walter Savage Landor:strove with none,for none was worth my strife.Nature I loved and, next to Nature, Art:I warm'd both hands before the fire of life.It sinks, and I am ready to depart

                                                                                                                                                   ——W.S.Landor

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