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Posted to common-issues@hadoop.apache.org by "Steve Loughran (JIRA)" <ji...@apache.org> on 2015/11/24 13:18:11 UTC

[jira] [Created] (HADOOP-12593) multiple "volatile long" field declarations exist in the Hadoop codebase

Steve Loughran created HADOOP-12593:
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             Summary: 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: Critical


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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