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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-12593) multiple "volatile long" field declarations exist in the Hadoop codebase
Date Tue, 24 Nov 2015 17:49:11 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-12593?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Steve Loughran updated HADOOP-12593:
------------------------------------
    Priority: Minor  (was: Critical)

> multiple "volatile long" field declarations exist in the Hadoop codebase
> ------------------------------------------------------------------------
>
>                 Key: HADOOP-12593
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12593
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 2.8.0
>            Reporter: Steve Loughran
>            Priority: Minor
>
> If you get your IDE to scan for "volatile long", you find 20-30 entries. Volatile operations
on `long` variables are not guaranteed to be atomic, so these usages can be vulnerable to
race conditions generating invalid data.
> they need to be replaced by AtomicLong references, except in the specific case that you
want performance values for statistics, and are prepared to take the risk



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