[SPARK-16272][core] Allow config values to reference conf, env, system props.#14022

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vanzin wants to merge 10 commits intoapache:masterfrom

vanzin:SPARK-16272

Commits on Jul 1, 2016

[SPARK-16272][core] Allow config values to reference conf, env, system props.
Marcelo Vanzin
committed

Commits on Jul 5, 2016

Allow chained references.
Marcelo Vanzin
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Commits on Jul 7, 2016

Use SQL-style prefixes for the references.
Marcelo Vanzin
committed

Commits on Jul 13, 2016

Merge branch 'master' into SPARK-16272
Marcelo Vanzin
committed

Commits on Jul 14, 2016

Apply substitution to all configs.
Marcelo Vanzin
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Use Regex.replaceAllIn.
Marcelo Vanzin
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Commits on Jul 18, 2016

Don't error out on unknown prefixes.
Marcelo Vanzin
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Drop "spark." requirement.
Marcelo Vanzin
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Revert "Drop "spark." requirement."
Marcelo Vanzin
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Expand default values that are strings.
Marcelo Vanzin
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