[SPARK-22986][Core] Use a cache to avoid instantiating multiple instances of broadcast variable values#20183

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ho3rexqj wants to merge 4 commits intoapache:masterfrom

ho3rexqj:fix/cache-broadcast-values

Commits on Jan 8, 2018

Adding tests to illustrate the problem we were having with broadcast variables.
ho3rexqj
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Adding broadcast value cache to avoid instantiating broadcast values multiple times on executors when memory is constrained.
ho3rexqj
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Commits on Jan 11, 2018

Reduced the number of local threads in tests.
ho3rexqj
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Commits on Jan 12, 2018

Code style fix.
ho3rexqj
committed