anmolnar commented on a change in pull request #1228: ZOOKEEPER-3698: fixing
NoRouteToHostException when starting large cluster locally
URL: https://github.com/apache/zookeeper/pull/1228#discussion_r368557610
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File path: zookeeper-docs/src/main/resources/markdown/zookeeperAdmin.md
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@@ -1542,6 +1555,22 @@ the variable does.
ZAB protocol and the Fast Leader Election protocol. Default
value is **false**.
+* *multiAddress.reachabilityCheckEnabled* :
+ (Java system property: **zookeeper.multiAddress.reachabilityCheckEnabled**)
+ **New in 3.6.0:**
+ Since ZooKeeper 3.6.0 you can also [specify multiple
addresses](#id_multi_address)
+ for each ZooKeeper server instance (this can increase availability when
multiple physical
+ network interfaces can be used parallel in the cluster). ZooKeeper will
perform ICMP ECHO requests
+ or try to establish a TCP connection on port 7 (Echo) of the destination
host in order to find
+ the reachable addresses. This happens only if you provide multiple
addresses in the configuration.
+ The reachable check can fail if you hit some ICMP rate-limitation, (e.g.
on MacOS) when you try to
+ start a large (e.g. 11+) ensemble members cluster on a single machine for
testing.
+
+ Default value is **true**. By setting this parameter to 'false' you can
disable the reachability checks.
+ Please note, disabling the reachability check will cause the cluster not
to be able to reconfigure
+ itself properly during network problems, so the disabling is advised only
during testing.
Review comment:
Would you please elaborate a little bit on this? Why will the cluster not
able to reconfigure if the ping check is disabled?
On the other hand, does that mean that multi-address feature only works
properly if hosts respond to ICMP Echo requests?
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