Github user hanm commented on a diff in the pull request:
https://github.com/apache/zookeeper/pull/173#discussion_r116099795
--- Diff: src/java/main/org/apache/zookeeper/server/quorum/QuorumPeer.java
---
@@ -181,6 +197,33 @@ public void recreateSocketAddresses() {
}
}
+ /**
+ * Resolve the hostname to IP addresses, and find one reachable
address.
+ *
+ * @param hostname the name of the host
+ * @param timeout the time, in millseconds, before {@link
InetAddress#isReachable}
+ * aborts
+ * @return a reachable IP address. If no such IP address can be
found,
+ * just return the first IP address of the hostname.
+ *
+ * @exception UnknownHostException
+ */
+ public InetAddress getReachableAddress(String hostname, int
timeout)
+ throws UnknownHostException {
+ InetAddress[] addresses = InetAddress.getAllByName(hostname);
+ for (InetAddress a : addresses) {
+ try {
+ if (a.isReachable(timeout)) {
--- End diff --
I think this is a valid concern. On top of this, I think we should make
sure user can resort to old behavior if needed. With this patch the
`isReachable` will be called in any case, regardless of the property
'zookeeper.ipReachableTimeout' is defined or not. How about something like this:
if (zookeeper.ipReachableTimeout is not defined) {
address = InetAddress.getByName(this.hostname);
} else {
address = getReachableAddress(this.hostname, ipReachableTimeout);
}
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