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HADOOP-16114. NetUtils#canonicalizeHost gives different value for same host.

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Author:    Praveen Krishna <praveenkrishna@tutanota.com>
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Praveen Krishna 2019-03-07 11:06:34 +00:00 committed by Steve Loughran
parent 0eba4079bc
commit 2b94e51a8f
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1 changed files with 3 additions and 1 deletions
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hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/NetUtils.java
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@ -288,8 +288,10 @@ private static String canonicalizeHost(String host) {
if (fqHost == null) { if (fqHost == null) {
try { try {
fqHost = SecurityUtil.getByName(host).getHostName(); fqHost = SecurityUtil.getByName(host).getHostName();
// slight race condition, but won't hurt
canonicalizedHostCache.putIfAbsent(host, fqHost); canonicalizedHostCache.putIfAbsent(host, fqHost);
// ensures that we won't return a canonicalized stale (non-cached)
// host name for a given host
fqHost = canonicalizedHostCache.get(host);
} catch (UnknownHostException e) { } catch (UnknownHostException e) {
fqHost = host; fqHost = host;
} }