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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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Huaiyong Fu updated STORM-2750:
-------------------------------
Description:
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
was:
update HBaseSecurityUtil singleton to fix double_checked
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
> fix HBaseSecurityUtil 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
> Labels: pull-request-available
>
> 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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