L7 (application layer) ping support
Issue Type: New Feature
Components: c client
Affects Versions: 3.3.1
Reporter: Chang Song
Zookeeper is used in applications where fault tolerance is important. Its
client i/o thread send/recv heartbeats to/fro Zookeeper ensemble to stay
connected. However healthy heartbeat does not always means that the application
that uses Zookeeper client is in good health, it only means that ZK client
thread is in good health.
This I needed something that can tagged onto Zookeeper ping that represents L7
(application) health as well.
I have modified C client source to support this in minimal way. I am new to
Zookeeper, so please code review this code. I am actually using this code in
our in-house solution.
Thank you very much.
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