您好我在Ec2实例上安装了cassandra并配置了yaml文件和拓扑设置但是当我启动服务时（第一次）它会抛出以下错误。有谁能告诉我修复？非常感谢
Fail setting `ulimit '-p' '8'`: /etc/init.d/dse: line 430: ulimit: pipe size: cannot modify limit: Invalid argument
飞行前检查结果：
ERROR vm.max_map_count is set to 65530.
ERROR Suggested value is 131072.
ERROR Kernel State check did not complete successfully.
ERROR 12 missing limits found:
ERROR * soft nofile 32768
ERROR * hard nofile 32768
ERROR root soft nofile 32768
ERROR root hard nofile 32768
ERROR * soft memlock unlimited
ERROR * hard memlock unlimited
ERROR root soft memlock unlimited
ERROR root hard memlock unlimited
ERROR * soft as unlimited
ERROR * hard as unlimited
ERROR root soft as unlimited
ERROR root hard as unlimited
ERROR Limits check did not complete successfully.
INFO '/etc/security/limits.d/90-nproc.conf' does not exist. Shouldn't need this fix.