Hiroshi Ikeda created HADOOP-10304:
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Summary: Configuration should not expose its instance in
constructors
Key: HADOOP-10304
URL: https://issues.apache.org/jira/browse/HADOOP-10304
Project: Hadoop Common
Issue Type: Bug
Reporter: Hiroshi Ikeda
Priority: Minor
org.apache.hadoop.conf.Configuration exposes a reference of its instance in
constructors via its class variable REGISTRY, which means incomplete instances
are accessible. For example addDefaultResource() may access incomplete
instances (especially for subclasses of Configuration).
Actually, static methods in Configuration are not needed to access its
instances, and it is enough that each instance checks modification of class
variables. This is also useful to avoid deadlock between locking instances and
locking the class object, which may be happened when you will resolve race
conditions yet existing in Configuration.
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