can locationClass work properly？

[eillon]

in my view, the locationClass is initialized by this function:

public static CrailLocationClass getLocationClass() throws UnknownHostException{
	return CrailLocationClass.get(InetAddress.getLocalHost().getCanonicalHostName().hashCode());
}

The locationClass is a String's hashCode, so it can be a negative number. However, in your code, the negative locationClass doesn't work at all.I think remove the judge of locationClass will be better.

[patrickstuedi]

Thanks for catching this. It seems, though, there are more changes required to fix this. Like this check here: https://github.com/apache/incubator-crail/blob/95275d3bb15df5f99e1418cbaeed2e6c8fd8073e/namenode/src/main/java/org/apache/crail/namenode/NameNodeService.java#L95

should probably be != 0