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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

Unusual Tomcat failed to start issue 

First check the tomcat.log under /path/to/sqoop//test/target/sqoop-cargo-tests/ org.apache.sqoop.integration.connector.jdbc.generic.FromRDBMSToHDFSTest/testBasic/log/tomcat.log

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Solution : Nuke the directory /var/folders/l8/hyl1hnqj3vq57gdf8f9nb0740000gp/T/cargo 

 Some Some related tickets that is in place to fix some of these quirks

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