We use opentsdb emitter to transfer metrics to opentsdb. But we found that the 
OpentsdbSender occupied 100% of one core. 

![image](https://user-images.githubusercontent.com/1287334/44651691-a347d480-aa1c-11e8-8179-1f2db2970767.png)

![image](https://user-images.githubusercontent.com/1287334/44651648-84e1d900-aa1c-11e8-9f29-a77c18931b14.png)

![image](https://user-images.githubusercontent.com/1287334/44651782-ddb17180-aa1c-11e8-95bd-47db63007f8f.png)
when the eventQueue is empty, a loop will happen. 


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https://github.com/apache/incubator-druid/issues/6247 ]
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