@Richard Corfield

You can get GC output logs out of NiFi by adding the following lines to NiFi's bootstrap.conf file:

java.arg.20=-XX:+PrintGCDetails

java.arg.21=-XX:+PrintGCTimeStamps

java.arg.22=-XX:+PrintGCDateStamps

java.arg.23=-Xloggc:<file>

The last entry allows you to specific a separate log file for this output to be written in to rather then stdout.

Thanks,

Matt