ztzg opened a new pull request #1068: ZOOKEEPER-1998: Allow C client to throttle host name resolutions URL: https://github.com/apache/zookeeper/pull/1068 Some environments experience high DNS load because of the name resolutions introduced by [ZOOKEEPER-1355](https://issues.apache.org/jira/browse/ZOOKEEPER-1355). This patch allows clients to set a minimum delay to observe between "routine" resolutions using a `zoo_set_servers_resolution_delay` API function. An application can influence the rate of polling via its `delay_ms` parameter: when set to a value greater than zero, the client skips most "routine" resolutions which would have happened in a window of that many milliseconds since the last successful one. Setting `delay_ms` to `0` disables the new logic, reverting to the default behavior. Setting it to `-1` disables network resolutions during normal operation (but not, e.g., on connection loss).
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