aplex commented on a change in pull request #3335:
URL: https://github.com/apache/gobblin/pull/3335#discussion_r674982513
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File path:
gobblin-utility/src/main/java/org/apache/gobblin/util/ConfigUtils.java
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@@ -116,7 +116,8 @@ public static Properties configToProperties(Config config,
Optional<String> pref
Config resolvedConfig = config.resolve();
for (Map.Entry<String, ConfigValue> entry : resolvedConfig.entrySet()) {
if (!prefix.isPresent() || entry.getKey().startsWith(prefix.get())) {
- String propKey = desanitizeKey(entry.getKey());
+ // Intern the string so that constant keys are not duplicated to
save memory
+ String propKey = desanitizeKey(entry.getKey()).intern();
Review comment:
The exact behavior of intern() is not well document, and changed across
java versions. Here is an article where a guy reverse-engineers it -
http://java-performance.info/string-intern-in-java-6-7-8
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