[jira] [Updated] (HADOOP-11387) Simplify NetUtils#canonicalizeHost()

["Allen Wittenauer (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-11387?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Allen Wittenauer updated HADOOP-11387:
--------------------------------------
    Labels: BB2015-05-TBR  (was: )

> 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: Li Lu
>              Labels: BB2015-05-TBR
>         Attachments: HADOOP-11387-121514-1.patch, HADOOP-11387-121514-2.patch, HADOOP-11387-121514.patch
>
>
> 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 triggers a findbugs warning. The cache is used for caching NN resolution for the client-side {{FileSystem}} objects. In most of the use cases there are at most one or two instances in the cache. This jira proposes to eliminate the findbugs warnings and to simplify the code using {{CacheMap}}.



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