不能启动cassandra.设置ulimit失败

我安装了cassandra并尝试启动服务，但仍然出现以下错误。我可以知道我应该换什么值吗?谢谢你的宝贵时间。

#service dse start
Starting DSE daemon : dse
DSE daemon starting with just Cassandra enabled (edit /etc/default/dse to enable)
Fail setting `ulimit '-p' '8'`: /etc/init.d/dse: line 430: ulimit: pipe size: cannot modify limit: Invalid argument
 /etc/init.d/dse file contains below info
copy_limits(){
    # Use CASSANDRA_USER as a default argument
    local user=${1:-${CASSANDRA_USER}}
    # Since /bin/sh has a limited `ulimit` and `prlimit` from 'utils-linux' is
    #   not well spread, we use `for` as an alternative
    local c
    for p in -t -f -d -s -c -m -l -p -n; do
        local v="$( su - "$user" -s /bin/sh -c "ulimit $p" 2>/dev/null )"
==>line 430 in error ***** :       ulimit $p $v 2>&1 | 
            while read err; do
                log_message "Fail setting `ulimit '$p' '$v'`: $err"
            done
    done
}