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If zombie java exists, please kill them before starting integration tests next time, because these zombie java processes will hold the ports (such as 12000, 8080, 1527) and the following integration test could not obtain these ports. Then the following integration test will be stuck.

ps -ef | grep java
killall -9 java
 
or more advanced....
for p in `ps aux | grep java | grep YarnChild| sed -re "s/<username> ([0-9]+) ./\1/"`; do echo $p; kill -9 $p;  done