1.代码示例

public class AdminSample {
    private static final String topicName = "steven";

    private static final int partitionNumber = 1;

    private static final Short replicationFactor = 1;

    /**
     * 创建AdminClient
     */
    public static AdminClient adminClient() {
        Properties properties = new Properties();
        properties.setProperty(AdminClientConfig.BOOTSTRAP_SERVERS_CONFIG, "127.0.0.1:9092");
        AdminClient adminClient = AdminClient.create(properties);
        return adminClient;
    }

    /**
     * config信息修改
     */
    public static void main(String[] args) throws ExecutionException, InterruptedException {
        AdminClient adminClient = AdminSample.adminClient();
        Map<ConfigResource, Config> configMaps = new HashMap<>();
        // 组织两个参数
        ConfigResource configResource = new ConfigResource(ConfigResource.Type.TOPIC, topicName);
        Config config = new Config(Arrays.asList(new ConfigEntry("preallocate", "true")));
        configMaps.put(configResource, config);
        AlterConfigsResult alterConfigsResult = adminClient.alterConfigs(configMaps);
        alterConfigsResult.all().get();
    }
}

代码运行成功后，再运行2.6的代码，可以看到ConfigEntry(name=preallocate, value=false, source=DEFAULT_CONFIG, isSensitive=false, isReadOnly=false, synonyms=[])的value值被更改为了true。