Thanks Bryan, helps a lot, 
here is my use case,  I use a listen Syslog processor -> Data Output
port(Spark application), now from the back pressure discussion, assuming I
am using  “Back pressure data size 
 threshold.”=100MB , and that size is reached, and listen Syslog processor
wont run and , but still the real source from where the listen Syslog
processor is listening is emitting data , what happens to that data ?. lost
?. 



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