Github user eshioji commented on the pull request:

    https://github.com/apache/storm/pull/568#issuecomment-107578216
  
    @revans2 Re: pending metric, I see. I removed it thinking that it 
exclusively had to do with the `pendingMessage` field, but now I realise it was 
actually tracking messages inside Netty's internal buffer, too. I brought it 
back; should be equivalent to the old metrics.
    
    Re: performance, I couldn't see any performance difference on my test 
cluster (5 node, processes around 60K tuples per sec) under "normal" 
conditions. With `v0.9.4` it would start to go haywire after several hours and 
start to consume lots of CPU and a lot of tuples start to fail. That symptom 
seems to have been alleviated with the patch. However, this topology feeds off 
a live data stream so admittedly it's not a strict comparison (because the 
volume of data is not completely the same from run to run). Is there a standard 
way you guys use to verify performance regression?
    
    
      


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