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https://issues.apache.org/jira/browse/STORM-2750?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Stig Rohde Døssing resolved STORM-2750.
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Resolution: Fixed
Fix Version/s: 1.1.2
2.0.0
> fix double_checked locking
> --------------------------
>
> Key: STORM-2750
> URL: https://issues.apache.org/jira/browse/STORM-2750
> Project: Apache Storm
> Issue Type: Bug
> Affects Versions: 2.0.0
> Reporter: Huaiyong Fu
> Assignee: Huaiyong Fu
> Labels: pull-request-available
> Fix For: 2.0.0, 1.1.2
>
>
> update HBaseSecurityUtil singleton to fix double_checked locking
> Double-Checked Locking is widely cited and used as an efficient method for
> implementing lazy initialization in a multithreaded environment.
> Unfortunately, it will not work reliably in a platform independent way when
> implemented in Java, without additional synchronization. When implemented in
> other languages, such as C++, it depends on the memory model of the
> processor, the reorderings performed by the compiler and the interaction
> between the compiler and the synchronization library. Since none of these are
> specified in a language such as C++, little can be said about the situations
> in which it will work. Explicit memory barriers can be used to make it work
> in C++, but these barriers are not available in Java.
> See url link for details:
> http://www.cs.umd.edu/~pugh/java/memoryModel/DoubleCheckedLocking.html
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