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You are looking at an old document. The current doc (for version 2.x) from DataStax Recommended Production Settings indicates that the nofile value should be set to 100,000.

你正在看一个旧文件。 DataStax推荐生产设置中的当前doc（对于版本2.x）表示nofile值应设置为100,000。

Packaged installs: Ensure that the following settings are included in the /etc/security/limits.d/cassandra.conf file:

打包安装：确保/etc/security/limits.d/cassandra.conf文件中包含以下设置：

cassandra - memlock unlimited
cassandra - nofile 100000
cassandra - nproc 32768
cassandra - as unlimited

Tarball installs: Ensure that the following settings are included in the /etc/security/limits.conf file:

Tarball安装：确保/etc/security/limits.conf文件中包含以下设置：

* - memlock unlimited
* - nofile 100000
* - nproc 32768
* - as unlimited

If you run Cassandra as root, some Linux distributions such as Ubuntu, require setting the limits for root explicitly instead of using *:

如果以root身份运行Cassandra，某些Linux发行版（如Ubuntu）需要显式设置root限制而不是使用*：

root - memlock unlimited
root - nofile 100000
root - nproc 32768
root - as unlimited

Try that, and see if it helps.

试试看，看看是否有帮助。