Philippe Serreault created ZOOKEEPER-2965:
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Summary: prevent DNS queries spam
Key: ZOOKEEPER-2965
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2965
Project: ZooKeeper
Issue Type: Improvement
Components: c client
Reporter: Philippe Serreault
Priority: Minor
Hello,
First of all, some context about the issue and why it became quite apparent to
me:
* I'm using the native zookeeper client on linux
* I'm not declaring -DTHREADED
* My zookeeper ensemble is made of server names that need to be resolved
* The ensemble and DNS servers are "next" to each other
* My client is "far" and uses an unreliable network path that can drop UDP
requests
For each run in client's main loop, all servers in ensemble are resolved, even
if no change in servers list occurred (zookeeper_interest .. update_addrs ..
resolve_hosts).
In my situation, DNS requests could timeout and would trigger a reconnection to
ensemble.
Please find attached a patch that would prevent DNS queries when hostname was
not changed.
Best regards,
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