> This is not important, I just describe what I had met, just only to provide 
> the info to community to discuss.

I think it is important to do upgrade, really, most of 5.x bug fixes are coming 
from community. So if you have time, don't hesitate to send pull request to fix.

> First, #999 exception occur, but skywalking is still work. Is this will 
> affect the usability and stability?

It should not happen, but we don't find why. And don't receive any report in 
latest version. Sorry, I don't have the answer.

> Second, I start three collector nodes using collector cluster mode, and of 
> course there exists three nodes in zookeeper, but how they work? Only one is 
> active and the other two nodes are only backup? Or there nodes are active and 
> provide service at same time?

All are working, for sure.

> Third, I found some confused thing about es cluster nodes in zookeeper, I 
> config four es nodes, but in the zk path "/skywalking/storage/elasticsearch", 
> at time point1, there exists two es nodes, at time point2, change to three es 
> nodes, I am confused.

Is this done by our project? I am not following about this.

[ Full content available at: 
https://github.com/apache/incubator-skywalking/issues/1615 ]
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