Github user satishd commented on the pull request: https://github.com/apache/storm/pull/1131#issuecomment-193353011 @revans2 @hmcl putIfAbsent issue on JDK 7 can be avoided if it is changed from Map to ConcurrentMap.
--- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. ---