Haohui Mai created HADOOP-11387:
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Summary: Simplify NetUtils#canonicalizeHost()
Key: HADOOP-11387
URL: https://issues.apache.org/jira/browse/HADOOP-11387
Project: Hadoop Common
Issue Type: Bug
Reporter: Haohui Mai
Assignee: Haohui Mai
Currently {{NetUtils#canonicalizeHost}} uses a {{ConcurrentHashMap}} to cache
the canonicalized hostname.
{code}
private static String canonicalizeHost(String host) {
// check if the host has already been canonicalized
String fqHost = canonicalizedHostCache.get(host);
if (fqHost == null) {
try {
fqHost = SecurityUtil.getByName(host).getHostName();
// slight race condition, but won't hurt
canonicalizedHostCache.put(host, fqHost);
} catch (UnknownHostException e) {
fqHost = host;
}
}
return fqHost;
}
{code}
The code can be simplified using {{CacheMap}}.
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