When the value of a configuration key is set to its unresolved form, it causes
the IllegalStateException in Configuration.get() stating that substitution
depth is too large.
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Key: HADOOP-6871
URL: https://issues.apache.org/jira/browse/HADOOP-6871
Project: Hadoop Common
Issue Type: Bug
Components: conf
Reporter: Arvind Prabhakar
When a configuration value is set to its unresolved expression string, it leads
to recursive substitution attempts in {{Configuration.substituteVars(String)}}
method until the max substitution check kicks in and raises an
IllegalStateException indicating that the substitution depth is too large. For
example, the configuration key "{{foobar}}" with a value set to
"{{$\{foobar\}}}" will cause this behavior.
While this is not a usual use case, it can happen in build environments where a
property value is not specified and yet being passed into the test mechanism
leading to failures due to this limitation.
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