Failed to start Doris BE on centos 7

[chalsliu]

When starting Doris BE, an error is reported and the process cannot be started. Even if there is actually no existing one.

$ sh bin/start_be.sh 
bin/start_be.sh: line 66: kill: (2293) - No such process

[chalsliu]

if [ -f $pidfile ]; then
 if kill -0 $(cat $pidfile); then
 echo "Backend running as process `cat $pidfile`. Stop it first."
 exit 1
 else
 rm $pidfile
 fi
fi

Solution:
Don't use kill to send a signal to check whether the process is started. A better way is to verify the existence of the /proc/$pid path. This method can further obtain other information about the process for more accurate judgment.