Parpool Java exception occurred: 2014a & Mac - Only when wifi at home turned on?

Setup: Matlab 2014a, Mac OS x 10.7.5.

Problem: Parpool throws a Java exception when I try to run it with my home wifi turned on and works when I turn it off.

Run: parpool

Error:

Error using parpool (line 99)
Java exception occurred:
java.net.UnknownHostException: craig-2: craig-2: nodename nor servname provided, or not known
  at java.net.InetAddress.getLocalHost(InetAddress.java:1438)
Caused by: java.net.UnknownHostException: craig-2: nodename nor servname provided, or not known
  at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
  at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:866)
  at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1258)
  at java.net.InetAddress.getLocalHost(InetAddress.java:1434)

Any ideas?

Thanks,

Craig

[Edric Ellis]

Could you please try the following in a MATLAB session when your wifi is switched on:

clear classes
c = parcluster('local')

(I'm expecting this to cause problems too - it would be great if you could post the full error).

[Craig]

Hi Edric, Thanks for getting back. I will try at home but will probably be Friday as not going back until then. In the mean time, this is what it gives on the Work Wifi.

c =

 Local Cluster

    Properties: 

                          Profile: local
                         Modified: false
                             Host: Craig-2.local
                       NumWorkers: 2

               JobStorageLocation: /Users/cpt/.matlab/local_cluster_jobs/R2014a
 RequiresMathWorksHostedLicensing: false

    Associated Jobs: 

                   Number Pending: 0
                    Number Queued: 0
                   Number Running: 2
                  Number Finished: 0

Thanks, Craig

[Craig]

Here is the full error on my home network following your prompt:

c = parcluster('local') >> c = parcluster('local') Error using parcluster (line 53) Java exception occurred: java.net.UnknownHostException: craig-2: craig-2: nodename nor servname provided, or not known at java.net.InetAddress.getLocalHost(InetAddress.java:1438) Caused by: java.net.UnknownHostException: craig-2: nodename nor servname provided, or not known at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method) at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:866) at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1258) at java.net.InetAddress.getLocalHost(InetAddress.java:1434)

[Edric Ellis]

Hm, I'm not totally sure what's going wrong here. There's something awry with the network name resolution on your machine. I suggest you might be best contacting our installation support team to see if they can help you.

[Craig]

Hi Edric,

Thanks for having a look, I'll contact them and see what they say and report back if there is a solution.

Thanks, Craig

[Steven]

Hi Craig and Edric,

I am experiencing this issue as well. I am running 2014a on Mac OS x 10.9.4. Were you able to find a solution?

Thanks, Blair

[Marco Borges]

I have the same error! Maybe is related with this java but, don't you think?

 https://bugs.openjdk.java.net/browse/JDK-7180557

Answer 1

[Craig]

I'm away and can't check but just received some advice from support:

In this last case, one possible cause could be related to a corrupted hosts file.

On Macintosh and Linux systems, the file is under the directory:

/etc/hosts Please make sure to map hostnames to valid IP addresses.

The IP address and the username for the local host can be searched using the following instructions:

>> ip = char( getHostAddress(java.net.InetAddress.getLocalHost)) >> user = getenv('UserName')

Please ping the machine name to test.

[Viktor Ivanov]

Modifying the hosts file fixed the issue for me. In terminal, typing

hostname

or at the matlab prompt '!hostname' will tell you your local host name. Copy the output from that command and go to the file /etc/hosts and add the line

127.0.0.1    {your local host name}

You need sudo privileges to modify this file. That did the trick for me.

[Daniel]

I also had the same issue on 2013b and OS X 10.9.5 Adding my own machine to /etc/hosts did the trick for me! Thanks & Cheers, Daniel

[Franck Dernoncourt]

Same here, matlab prompt '!hostname' and adding it to host file worked for me. Ubuntu 12.04 with R2014a x64. Thanks!

[Zhi Feng]

it works. Thanks

Answer 2

[Thomas Ibbotson]

A patch has been released for this bug see: Bug report 1119179

Answer 3

[Carsten Hoever]

Did you find a solution for the problem? I am having the same problem with OSX 10.9.3:

Error using matlabpool (line 137) Java exception occurred: java.net.UnknownHostException: server.munkiisland.private: server.munkiisland.private: nodename nor servname provided, or not known at java.net.InetAddress.getLocalHost(InetAddress.java:1438) Caused by: java.net.UnknownHostException: server.munkiisland.private: nodename nor servname provided, or not known at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method) at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:866) at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1258) at java.net.InetAddress.getLocalHost(InetAddress.java:1434)

[Steven]

I have not found a permanent solution, but the issue seems to be related to network settings. When I unplug my computer from the network and turn off WiFi, I am able to get the parallel pool to start. This is only a temporary workaround, but I hope to figure out the underlying cause with a bit more investigation.

-Blair

[Craig]

Yes, sorry for the late reply - but I've done exactly the same, turn wifi off, start par pool - turn back on. Dirty but it works! Best, Craig

Answer 4

[Steven]

Thanks for the suggestion Craig! I went to check the host file and noticed that my parpool is starting up fine now. The only thing that changed is that I shutdown and brought my laptop home for a few days where I used it on a different network. Very curious...