Skip registering Configuration instances that don't load default values
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Key: HADOOP-7482
URL: https://issues.apache.org/jira/browse/HADOOP-7482
Project: Hadoop Common
Issue Type: Improvement
Components: conf
Affects Versions: 0.20.203.0
Reporter: Steve Loughran
Priority: Minor
The Configuration constructor registers each instance in a WeakHashMap for
reloading if a new default resource is added by way of
Configuration.addDefaultResource(). Those configurations that don't declare
that they load the defaults (an attribute that is only ever set in the
constructor) could skip being registered.
This would deliver minor performance/memory improvements if anyone is creating
many instances that don't read in default values. If this is not a common
practise, it's not worth adding the fix (which would include making
Configuration.loadDefaults final)
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