symat opened a new pull request #1228: ZOOKEEPER-3698: fixing NoRouteToHostException when starting large cluster locally URL: https://github.com/apache/zookeeper/pull/1228 When we tested RC 3.6.0, we had a problem of starting ZooKeeper cluster with large number (11+) of ensemble members locally on mac. We found exceptions in the logs when the new MultiAddress feature tries to filter the unreachable hosts from the address list. This involves the calling of the InetAddress.isReachable method with a default timeout of 500ms, which goes down to a native call in java and basically try to do a ping (an ICMP echo request) to the host. Naturally, the localhost should be always reachable. The problem was that on mac we have the ICMP rate limit set to 250 by default. In this patch we: - changed the reachability check behavior by disabling the check if there is only a single address provided (so we wouldn't be able to filter the unreachable addresses anyway). - added and documented a configuration parameter to disable the reachability check for testing. (default: enabled) - added and documented a configuration parameter to set the timeout for the reachability checks. (default: 1000ms)
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