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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