Github user Leemoonsoo commented on the pull request:
https://github.com/apache/incubator-zeppelin/pull/575#issuecomment-167705196
Thanks for the improvement.
What do you think about overriding validateObject() in ClientFactory.java?
for example
```
@Override
public boolean validateObject(PooledObject<Client> p) {
return p.getObject().getInputProtocol().getTransport().isOpen() &&
p.getObject().getOutputProtocol().getTransport().isOpen();
}
```
I'm not 100% sure if it is identical to this PR. but if it is, this could
be more simple.
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