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From ahgittin <...@git.apache.org>
Subject [GitHub] incubator-brooklyn pull request: Fix for the "unable to find a fre...
Date Wed, 27 May 2015 18:38:43 GMT
Github user ahgittin commented on a diff in the pull request:

    https://github.com/apache/incubator-brooklyn/pull/662#discussion_r31166051
  
    --- Diff: utils/common/src/main/java/brooklyn/util/net/Networking.java ---
    @@ -129,24 +127,89 @@ public static boolean isPortAvailable(InetAddress localAddress,
int port) {
                     } catch (SocketException e) {
                         throw Exceptions.propagate(e);
                     }
    +                // When using a specific interface saw failures not caused by port already
bound:
    +                //   * java.net.SocketException: No such device
    +                //   * java.net.BindException: Cannot assign requested address
    +                //   * probably many more
    +                // Check if the address is still valid before marking the port as not
available.
    +                boolean foundAvailableInterface = false;
                     while (nis.hasMoreElements()) {
                         NetworkInterface ni = nis.nextElement();
                         Enumeration<InetAddress> as = ni.getInetAddresses();
                         while (as.hasMoreElements()) {
                             InetAddress a = as.nextElement();
    -                        if (!isPortAvailable(a, port))
    -                            return false;
    +                        if (!isPortAvailable(a, port)) {
    +                            if (isAddressValid(a)) {
    +                                if (log.isTraceEnabled()) log.trace("Port {} : {} @ {}
is taken and the address is valid", new Object[] {a, port, nis});
    +                                return false;
    +                            }
    +                        } else {
    +                            foundAvailableInterface = true;
    +                        }
                         }
                     }
    +                if (!foundAvailableInterface) {
    +                    //Aborting with an error, even nextAvailablePort won't be able to
find a free port.
    +                    throw new RuntimeException("Unable to bind on any network interface,
even when letting the OS pick a port. Possible causes include file handle exhaustion, port
exhaustion. Failed on request for " + localAddress + ":" + port + ".");
    +                }
                 }
    -            
    +
                 return true;
             } finally {
                 // Until timeout was added, was taking 1min5secs for /fe80:0:0:0:1cc5:1ff:fe81:a61d%8
: 8081
    -            if (log.isTraceEnabled()) log.trace("Took {} to determine if port {} : {}
was available", 
    -                    new Object[] {Time.makeTimeString(watch.elapsed(TimeUnit.MILLISECONDS),
true), localAddress, port});
    +            // Svet - Probably caused by the now gone new Socket().connect() call, SO_TIMEOUT
doesn't
    +            // influence bind(). Doesn't hurt having it though.
    +            long elapsed = watch.elapsed(TimeUnit.SECONDS);
    +            boolean isDelayed = (elapsed >= 1);
    +            boolean isDelayedByMuch = (elapsed >= 30);
    +            if (isDelayed || log.isTraceEnabled()) {
    +                String msg = "Took {} to determine if port was available for {} : {}";
    +                Object[] args = new Object[] {Time.makeTimeString(watch.elapsed(TimeUnit.MILLISECONDS),
true), localAddress, port};
    +                if (isDelayedByMuch) {
    +                    log.warn(msg, args);
    +                } else if (isDelayed) {
    +                    log.debug(msg, args);
    +                } else {
    +                    log.trace(msg, args);
    +                }
    +            }
             }
         }
    +
    +    /**
    +     * Bind to the specified IP, but let the OS pick a port.
    +     * If the operation fails we know it's not because of
    +     * non-available port, the interface could be down.
    +     * 
    +     * If there's port exhaustion on a single interface we won't catch it
    +     * and declare the port is free. Doesn't matter really because the
    +     * subsequent bind of the caller will fail anyway and nextAvailablePort
    +     * wouldn't be able to find a free one either.
    +     */
    +    private static boolean isAddressValid(InetAddress addr) {
    +        ServerSocket ss;
    +        try {
    +            ss = new ServerSocket();
    +            ss.setSoTimeout(250);
    +        } catch (IOException e) {
    +            throw Exceptions.propagate(e);
    +        }
    +        try {
    +            ss.bind(new InetSocketAddress(addr, 0));
    +            return true;
    +        } catch (IOException e) {
    +            Exceptions.propagateIfFatal(e);
    +            if (log.isTraceEnabled()) log.trace("Binding on {} failed, interface could
be down, being reconfigured, file handle exhaustion, port exhaustion, etc.", addr);
    +            return false;
    +        } finally {
    +            try {
    +                ss.close();
    +            } catch (IOException e) {
    +                Exceptions.propagateIfFatal(e);
    --- End diff --
    
    as above - maybe a `closeQuietly` method?


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