I was running a Hadoop cluster on several machines with start-all.sh script. But I did something wrong so all java-processes were terminated (I checked that with jps, on every machine it returns nothing but itself). Surprisingly, executing netstat on the master machine shows me that there are connections with slaves in ESTABLISHED state. And now I am not able to run Hadoop again because its ports already in use.
I've found a way to manualy close these connections with tcpkill. But now I wonder how can this be possible? How can terminated process still use a TCP port?
