Github user cestella commented on the issue:

    https://github.com/apache/incubator-metron/pull/279
  
    Ok, just to clarify a bit; I think what is happening is that the yaf 
topology (which does exist) does not run by default (this was changed a while 
back because of resource constraints), but that does not prevent it from 
installing the yaf probe that pushes data to kafka.  It's the yaf probe that 
@dlyle65535 is stopping by not installing it.
    
    In general, just my $0.02, but I tend think the proper behavior is as 
follows:
    * All sensors get installed by default; bro, snort, yaf, etc.
    * None of them get started by default in either full-dev or quick-dev.  If 
you want them to start, turn them on via monit
    
    I'm not sure this should be within the scope of this PR, which is why 
@dlyle65535 made METRON-467.  As for what we do in the interrim, I'd say that 
either:
    * we either are ok with not installing yaf
    * we make the sensors in the `services_to_start` not start, not just the 
topologies.
    
    Thoughts and corrections would be greatly appreciated. :)


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