Github user eribeiro commented on a diff in the pull request: https://github.com/apache/zookeeper/pull/150#discussion_r98280911 --- Diff: src/java/main/org/apache/zookeeper/client/StaticHostProvider.java --- @@ -87,15 +75,104 @@ public StaticHostProvider(Collection<InetSocketAddress> serverAddresses) Collections.shuffle(this.serverAddresses); } + /** + * Evaluate to a hostname if one is available and otherwise it returns the + * string representation of the IP address. + * + * In Java 7, we have a method getHostString, but earlier versions do not support it. + * This method is to provide a replacement for InetSocketAddress.getHostString(). + * + * @param addr + * @return Hostname string of address parameter + */ + private String getHostString(InetSocketAddress addr) { + String hostString = ""; + + if(addr == null) { + return hostString; + } + if (!addr.isUnresolved()) { + InetAddress ia = addr.getAddress(); + + // If the string starts with '/', then it has no hostname + // and we want to avoid the reverse lookup, so we return + // the string representation of the address. + if (ia.toString().startsWith("/")) { + hostString = ia.getHostAddress(); + } else { + hostString = addr.getHostName(); + } + } else { + // According to the Java 6 documentation, if the hostname is + // unresolved, then the string before the colon is the hostname. + String addrString = addr.toString(); + hostString = addrString.substring(0, addrString.lastIndexOf(':')); + } + + return hostString; + } + public int size() { return serverAddresses.size(); } + // Counts the number of addresses added and removed during + // the last call to next. Used mainly for test purposes. + // See StasticHostProviderTest. + private int nextAdded = 0; + private int nextRemoved = 0; + + public int getNextAdded() { + return nextAdded; + } + + public int getNextRemoved() { + return nextRemoved; + } + public InetSocketAddress next(long spinDelay) { - ++currentIndex; - if (currentIndex == serverAddresses.size()) { - currentIndex = 0; + // Handle possible connection error by re-resolving hostname if possible + if (!connectedSinceNext) { + InetSocketAddress curAddr = serverAddresses.get(currentIndex); + if (!getHostString(curAddr).equals(curAddr.getAddress().getHostAddress())) { + LOG.info("Resolving again hostname: {}", getHostString(curAddr)); + try { + int thePort = curAddr.getPort(); + InetAddress resolvedAddresses[] = InetAddress.getAllByName(getHostString(curAddr)); + nextAdded = 0; + nextRemoved = 0; + if (resolvedAddresses.length == 1) { + serverAddresses.set(currentIndex, new InetSocketAddress(resolvedAddresses[0], thePort)); + nextAdded = nextRemoved = 1; + LOG.debug("Newly resolved address: {}", resolvedAddresses[0]); + } else { + int i = 0; + while(i < serverAddresses.size()) { + if(getHostString(serverAddresses.get(i)) == getHostString(curAddr)) { --- End diff -- Why call `getHostString(curAddr)` (here in a loop, at line 137, 138, 141) if the `currAddr` doesn't change? Better call once between line 136 and 137 and assign to a variable, no?
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