slfan1989 commented on code in PR #7527:
URL: https://github.com/apache/hadoop/pull/7527#discussion_r2020327596
##########
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/SecurityUtil.java:
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@@ -586,17 +594,62 @@ InetAddress getByName(String hostname) throws
UnknownHostException {
return hostResolver.getByName(hostname);
}
}
-
+
interface HostResolver {
- InetAddress getByName(String host) throws UnknownHostException;
+ InetAddress getByName(String host) throws UnknownHostException;
+ }
+
+ static abstract class CacheableHostResolver implements HostResolver {
+ private volatile LoadingCache<String, InetAddress> cache;
+
+ CacheableHostResolver(long expiryIntervalSecs) {
+ if (expiryIntervalSecs > 0) {
+ cache = CacheBuilder.newBuilder()
+ .expireAfterWrite(expiryIntervalSecs, TimeUnit.SECONDS)
Review Comment:
For the cache, should we set a configuration for the maximum number of
entries?
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