public virtual void TestNormalizeHostName()
{
IList <string> hosts = Arrays.AsList(new string[] { "127.0.0.1", "localhost", "1.kanyezone.appspot.com"
, "UnknownHost123" });
IList <string> normalizedHosts = NetUtils.NormalizeHostNames(hosts);
// when ipaddress is normalized, same address is expected in return
Assert.Equal(normalizedHosts[0], hosts[0]);
// for normalizing a resolvable hostname, resolved ipaddress is expected in return
NUnit.Framework.Assert.IsFalse(normalizedHosts[1].Equals(hosts[1]));
Assert.Equal(normalizedHosts[1], hosts[0]);
// this address HADOOP-8372: when normalizing a valid resolvable hostname start with numeric,
// its ipaddress is expected to return
NUnit.Framework.Assert.IsFalse(normalizedHosts[2].Equals(hosts[2]));
// return the same hostname after normalizing a irresolvable hostname.
Assert.Equal(normalizedHosts[3], hosts[3]);
}
public override IList <string> Resolve(IList <string> names)
{
// normalize all input names to be in the form of IP addresses
names = NetUtils.NormalizeHostNames(names);
IList <string> result = new AList <string>(names.Count);
if (names.IsEmpty())
{
return(result);
}
IList <string> uncachedHosts = GetUncachedHosts(names);
// Resolve the uncached hosts
IList <string> resolvedHosts = rawMapping.Resolve(uncachedHosts);
//cache them
CacheResolvedHosts(uncachedHosts, resolvedHosts);
//now look up the entire list in the cache
return(GetCachedHosts(names));
}
